Water-treatment industry reference Process selection depends on water quality and project conditions.
Your process challenges
Chemistry matched to real operating conditions.
Account for changing process streams, contaminant forms and downstream treatment before choosing the chemical route.
Treatment approach
Tannery & Leather Wastewater: understand the treatment stages first.
Classify chromium-bearing, sulfide-bearing and other streams first. Compare reduction / precipitation separately from organic-wastewater treatment. A general wastewater-plant image does not establish an existing segregated system.
Swipe horizontally to view the full diagram.
Segregate collection firstIdentify chromium, sulfide and other streams
Dedicated metal-stream treatmentOxidation state and separation route
Organic-stream treatmentLoading and biological compatibility
Sludge and effluentValidate for the relevant stream
Check together during selection
Evaluate chromium-bearing, sulfide-bearing and general wastewater streams separately. Consider reduction only where hexavalent chromium is detected; trivalent chromium requires attention to precipitation and separation.
Compare candidate products below by treatment objective. Evaluate different routes separately; the list does not imply simultaneous dosing.
Tannery & Leather Wastewater: match requirements to each treatment stage.
Compare treatment objectives, chemical functions and verification criteria stage by stage. Products in the table may be alternatives or serve different stages; they are not necessarily dosed together.
Define influent and objectives first
Share segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment. This helps organize treatment products by segregated streams and contamination characteristics and narrow the product and specification range.
Then confirm assessment limits
Assess chromium-bearing, sulfide-bearing and general wastewater streams separately. Consider reduction only when hexavalent chromium is detected; trivalent chromium requires precipitation and separation assessment.
Compare all treatment routesProduct roles, conditions and verification
Tannery & Leather Wastewater: treatment objectives and product routes
Treatment objective / stage
Product routes to compare
Function / applicable conditions
Checks before selection
Chromium speciation, reduction & separationHeavy-metal treatment & precipitationFilter by this objective
Compare reducing agents only when hexavalent chromium is detected and a reduction route has been selected. Select trivalent-chromium precipitation, pH adjustment and downstream separation separately.
View each product's function and conditions
Sodium Metabisulfite
Function:Participates in a defined hexavalent-chromium reduction or a specified trial-validated reaction route. Total chromium alone does not establish a need for a reducing agent. Conditions:Cr(VI) must be detected or the process must explicitly require the reducing component. Assess the reaction endpoint and subsequent precipitation.
Sodium Bisulfite
Function:Participates in a defined hexavalent-chromium reduction or a specified trial-validated reaction route. Total chromium alone does not establish a need for a reducing agent. Conditions:Cr(VI) must be detected or the process must explicitly require the reducing component. Assess the reaction endpoint and subsequent precipitation.
Ferrous Sulfate
Function:Participates in a defined hexavalent-chromium reduction or a specified trial-validated reaction route. Total chromium alone does not establish a need for a reducing agent. Conditions:Cr(VI) must be detected or the process must explicitly require the reducing component. Assess the reaction endpoint and subsequent precipitation.
Calcium Hydroxide
Function:Establishes the pH/alkalinity conditions needed for the relevant precipitation or controlled oxidation procedure. Conditions:Use the relevant metal/fluoride/cyanide speciation and reaction trials to define the conditions. Meeting pH once does not establish contaminant removal.
Sodium Hydroxide
Function:Establishes the pH/alkalinity conditions needed for the relevant precipitation or controlled oxidation procedure. Conditions:Use the relevant metal/fluoride/cyanide speciation and reaction trials to define the conditions. Meeting pH once does not establish contaminant removal.
Polyacrylamide
Function:Supports flocculation and solid–liquid separation of precipitates after reaction. Coagulant salts or PAM alone are not specialty removal agents for every dissolved target contaminant. Conditions:The target must have formed separable particles through the corresponding reaction or precipitation, with downstream sludge performance confirmed.
Metal type, oxidation state and complexation state determine the route. Chelated metals require a separate decomplexation assessment.
View each product's function and conditions
Calcium Hydroxide
Function:Establishes the pH/alkalinity conditions needed for the relevant precipitation or controlled oxidation procedure. Conditions:Use the relevant metal/fluoride/cyanide speciation and reaction trials to define the conditions. Meeting pH once does not establish contaminant removal.
Sodium Hydroxide
Function:Establishes the pH/alkalinity conditions needed for the relevant precipitation or controlled oxidation procedure. Conditions:Use the relevant metal/fluoride/cyanide speciation and reaction trials to define the conditions. Meeting pH once does not establish contaminant removal.
Sulfide Precipitation Chemicals
Function:Forms separable precipitates from specified dissolved metals; suitability depends on the metals and complexation state. Conditions:Have specific active-component information and sample trials, considering residual chemicals, off-gas and sludge. Sulfides must not be directly mixed with acid.
Sulfur-Based Heavy-Metal Precipitant
Function:Forms separable precipitates from specified dissolved metals; suitability depends on the metals and complexation state. Conditions:Have specific active-component information and sample trials, considering residual chemicals, off-gas and sludge. Sulfides must not be directly mixed with acid.
Ferric Chloride
Function:Supports flocculation and solid–liquid separation of precipitates after reaction. Coagulant salts or PAM alone are not specialty removal agents for every dissolved target contaminant. Conditions:The target must have formed separable particles through the corresponding reaction or precipitation, with downstream sludge performance confirmed.
Polyaluminium Chloride
Function:Supports flocculation and solid–liquid separation of precipitates after reaction. Coagulant salts or PAM alone are not specialty removal agents for every dissolved target contaminant. Conditions:The target must have formed separable particles through the corresponding reaction or precipitation, with downstream sludge performance confirmed.
Polyacrylamide
Function:Supports flocculation and solid–liquid separation of precipitates after reaction. Coagulant salts or PAM alone are not specialty removal agents for every dissolved target contaminant. Conditions:The target must have formed separable particles through the corresponding reaction or precipitation, with downstream sludge performance confirmed.
View product-specific checks
Calcium Hydroxide
Tannery & Leather Wastewater: Actual composition & form; Content basis; Water quality; Equipment materials; End-use requirements; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
Sodium Hydroxide
Tannery & Leather Wastewater: Actual composition & form; Content basis; Water quality; Equipment materials; End-use requirements; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
Sulfide Precipitation Chemicals
Tannery & Leather Wastewater: Actual sulfide composition; Complexation state; System enclosure & off-gas; Downstream separation; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
Sulfur-Based Heavy-Metal Precipitant
Tannery & Leather Wastewater: Metal types & oxidation states; Complexing agents; Actual active component; Trial & sludge results; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
Ferric Chloride
Tannery & Leather Wastewater: Effective iron content; Free acid; Impurities; Form & trial results; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
Polyaluminium Chloride
Tannery & Leather Wastewater: Al₂O₃ content; Basicity; Insoluble matter; pH test conditions; Impurity limits for the intended use; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
Polyacrylamide
Tannery & Leather Wastewater: Ionic type & charge characteristics; Viscosity and test concentration/temperature; Residual monomer & test report; Dissolution conditions; Trial evaluation criteria; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
Compare results using representative water samples or site data, retaining the test methods and operating conditions.
Coagulation, flocculation & clarificationCoagulation & solid–liquid separationFilter by this objective
Review water source, turbidity or suspended solids, pH, alkalinity and the settling or flotation process. Potable-water applications require product-specific end-use documentation.
View each product's function and conditions
Polyaluminium Chloride
Function:Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand. Conditions:Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
Aluminium Sulfate
Function:Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand. Conditions:Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
Ferric Chloride
Function:Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand. Conditions:Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
Ferric Sulfate
Function:Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand. Conditions:Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
Polyferric Sulfate
Function:Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand. Conditions:Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
Polyamine Coagulant
Function:An organic coagulant option that destabilizes colloids before further flocculation and solid–liquid separation. Conditions:Define the sample's charge demand, intended use and downstream process. A polymer name alone does not establish dosage or grade.
Poly(diallyldimethylammonium Chloride)
Function:An organic coagulant option that destabilizes colloids before further flocculation and solid–liquid separation. Conditions:Define the sample's charge demand, intended use and downstream process. A polymer name alone does not establish dosage or grade.
Polyacrylamide
Function:Polymer bridging and charge effects help build separable flocs. Flocculation does not remove dissolved salts or all COD. Conditions:Define particle and sludge properties, and match preparation, shear and settling/flotation/dewatering trials to the selected grade.
Polyacrylamide Emulsion
Function:Polymer bridging and charge effects help build separable flocs. Flocculation does not remove dissolved salts or all COD. Conditions:Define particle and sludge properties, and match preparation, shear and settling/flotation/dewatering trials to the selected grade.
Aluminium Chlorohydrate
Function:Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand. Conditions:Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
Sodium Aluminate
Function:Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand. Conditions:Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
Ferrous Chloride
Function:Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand. Conditions:Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
Biobased Flocculant
Function:A supplementary coagulation route for specific raw material sources or water conditions. Conditions:Have the material composition, end-use documents and comparison trials on the same water sample available.
View product-specific checks
Polyaluminium Chloride
Tannery & Leather Wastewater: Al₂O₃ content; Basicity; Insoluble matter; pH test conditions; Impurity limits for the intended use; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
Identify limiting nutrients, toxic inputs and operating causes first. Add nutrient or recovery products only where the process assessment supports their use.
View each product's function and conditions
Biological-Treatment Nutrient Formulation
Function:Supplies nutrients where an actual nitrogen, phosphorus or micronutrient deficit exists in the influent; it is not a default addition for all wastewater. Conditions:Have bioavailable carbon, nitrogen and phosphorus analysis and a nutrient-demand assessment available, avoiding added effluent nitrogen or phosphorus loads.
Bioaugmentation Formulations
Function:A supporting formulation route for specified biological treatment recovery or enhancement. Conditions:Define microbial strains/composition, activity and limiting factors. This does not replace investigation of loading, dissolved oxygen, toxicity or nutrient causes.
Sodium Bicarbonate
Function:Adds alkalinity and buffering capacity to maintain biological reaction conditions where an alkalinity deficit has been confirmed. Conditions:Confirm demand from alkalinity, nitrogen conversion or VFA trends. A single pH measurement does not replace system analysis.
Magnesium Hydroxide
Function:Adds alkalinity and buffering capacity to maintain biological reaction conditions where an alkalinity deficit has been confirmed. Conditions:Confirm demand from alkalinity, nitrogen conversion or VFA trends. A single pH measurement does not replace system analysis.
Assess the foam source, temperature and biological, membrane or coating process. Selection must consider downstream effects as well as initial foam knockdown.
View each product's function and conditions
Silicone Defoamer
Function:Controls foam under the relevant operating conditions using silicone, polyether or non-silicone formulation properties. Conditions:Compare defoaming trials, temperature and medium, and confirm downstream effects on biological treatment, membranes, coatings or product purity.
Polyether Defoamer
Function:Controls foam under the relevant operating conditions using silicone, polyether or non-silicone formulation properties. Conditions:Compare defoaming trials, temperature and medium, and confirm downstream effects on biological treatment, membranes, coatings or product purity.
Non-Silicone Defoamer
Function:Controls foam under the relevant operating conditions using silicone, polyether or non-silicone formulation properties. Conditions:Compare defoaming trials, temperature and medium, and confirm downstream effects on biological treatment, membranes, coatings or product purity.
Compare results using representative water samples or site data, retaining the test methods and operating conditions.
Need to compare these routes under your operating conditions?Share influent quality, treatment objectives and the existing process to discuss which products and conditions should be validated first.
Process & product matching
Select a treatment objective to explore suitable products.
Different treatment routes may apply. Open the matching notes for each product to review its role, conditions and purchasing criteria.
Assess chromium-bearing, sulfide-bearing and general wastewater streams separately. Consider reduction only when hexavalent chromium is detected; trivalent chromium requires precipitation and separation assessment.
A reducing and dechlorinating raw material for suitable membrane protection and other specified residual-oxidant control steps.
Why this matchesConditional option
Role
Participates in a defined hexavalent-chromium reduction or a specified trial-validated reaction route. Total chromium alone does not establish a need for a reducing agent.
Conditions
Cr(VI) must be detected or the process must explicitly require the reducing component. Assess the reaction endpoint and subsequent precipitation.
A reducing raw material for suitable dechlorination, specified oxygen-scavenging or reduction procedures.
Why this matchesConditional option
Role
Participates in a defined hexavalent-chromium reduction or a specified trial-validated reaction route. Total chromium alone does not establish a need for a reducing agent.
Conditions
Cr(VI) must be detected or the process must explicitly require the reducing component. Assess the reaction endpoint and subsequent precipitation.
Before purchase
Tannery & Leather Wastewater: Active reducing component; Solution content basis; Impurities; Monitoring & process conditions; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
A ferrous salt raw material for specified coagulation, reduction and phosphorus-control procedures.
Why this matchesConditional option
Role
Participates in a defined hexavalent-chromium reduction or a specified trial-validated reaction route. Total chromium alone does not establish a need for a reducing agent.
Conditions
Cr(VI) must be detected or the process must explicitly require the reducing component. Assess the reaction endpoint and subsequent precipitation.
A calcium alkali source for suitable neutralization, chemical softening and precipitation treatment.
Why this matchesConditional option
Role
Establishes the pH/alkalinity conditions needed for the relevant precipitation or controlled oxidation procedure.
Conditions
Use the relevant metal/fluoride/cyanide speciation and reaction trials to define the conditions. Meeting pH once does not establish contaminant removal.
Before purchase
Tannery & Leather Wastewater: Actual composition & form; Content basis; Water quality; Equipment materials; End-use requirements; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
A common alkali raw material for pH adjustment, certain metal-precipitation steps and specified cleaning or regeneration procedures.
Why this matchesConditional option
Role
Establishes the pH/alkalinity conditions needed for the relevant precipitation or controlled oxidation procedure.
Conditions
Use the relevant metal/fluoride/cyanide speciation and reaction trials to define the conditions. Meeting pH once does not establish contaminant removal.
Before purchase
Tannery & Leather Wastewater: Actual composition & form; Content basis; Water quality; Equipment materials; End-use requirements; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
Select a suitable PAM for clarification, settling, thickening and sludge dewatering, matching flocculation behavior to the water, particles and equipment.
Why this matchesConditional option
Role
Supports flocculation and solid–liquid separation of precipitates after reaction. Coagulant salts or PAM alone are not specialty removal agents for every dissolved target contaminant.
Conditions
The target must have formed separable particles through the corresponding reaction or precipitation, with downstream sludge performance confirmed.
Before purchase
Tannery & Leather Wastewater: Ionic type & charge characteristics; Viscosity and test concentration/temperature; Residual monomer & test report; Dissolution conditions; Trial evaluation criteria; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
Sulfide precipitation chemicals for specified industrial metal-bearing water systems.
Why this matchesConditional option
Role
Forms separable precipitates from specified dissolved metals; suitability depends on the metals and complexation state.
Conditions
Have specific active-component information and sample trials, considering residual chemicals, off-gas and sludge. Sulfides must not be directly mixed with acid.
Before purchase
Tannery & Leather Wastewater: Actual sulfide composition; Complexation state; System enclosure & off-gas; Downstream separation; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
A capture-and-precipitation formulation for specified heavy metals and complexation states, followed by flocculation and sludge separation.
Why this matchesConditional option
Role
Forms separable precipitates from specified dissolved metals; suitability depends on the metals and complexation state.
Conditions
Have specific active-component information and sample trials, considering residual chemicals, off-gas and sludge. Sulfides must not be directly mixed with acid.
Before purchase
Tannery & Leather Wastewater: Metal types & oxidation states; Complexing agents; Actual active component; Trial & sludge results; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
An iron salt raw material for coagulation and chemical phosphorus removal, supporting clarification and sludge–water separation.
Why this matchesConditional option
Role
Supports flocculation and solid–liquid separation of precipitates after reaction. Coagulant salts or PAM alone are not specialty removal agents for every dissolved target contaminant.
Conditions
The target must have formed separable particles through the corresponding reaction or precipitation, with downstream sludge performance confirmed.
Before purchase
Tannery & Leather Wastewater: Effective iron content; Free acid; Impurities; Form & trial results; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
For raw water and wastewater coagulation, compare active components, basicity and water-sample trials against clarification and phosphorus-removal requirements.
Why this matchesConditional option
Role
Supports flocculation and solid–liquid separation of precipitates after reaction. Coagulant salts or PAM alone are not specialty removal agents for every dissolved target contaminant.
Conditions
The target must have formed separable particles through the corresponding reaction or precipitation, with downstream sludge performance confirmed.
Before purchase
Tannery & Leather Wastewater: Al₂O₃ content; Basicity; Insoluble matter; pH test conditions; Impurity limits for the intended use; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
An aluminium salt option for coagulation and chemical phosphorus removal in raw water and wastewater, supporting clarification and solid–liquid separation.
Why this matchesConditional option
Role
Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand.
Conditions
Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
An iron salt option for water and wastewater coagulation and phosphorus removal, followed by flocculation and separation.
Why this matchesConditional option
Role
Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand.
Conditions
Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
Before purchase
Tannery & Leather Wastewater: Iron content; Free acid; Insoluble matter; Impurity requirements for the intended use; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
A polymeric iron coagulant option for clarification, phosphorus removal and sludge treatment support.
Why this matchesConditional option
Role
Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand.
Conditions
Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
An aluminium coagulant with a different composition from PAC, for raw water and wastewater clarification.
Why this matchesConditional option
Role
Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand.
Conditions
Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
Before purchase
Tannery & Leather Wastewater: Al₂O₃ basis; Basicity; Impurities; Specific end use; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
An alkaline aluminium component for suitable coagulation, chemical phosphorus removal and precipitation softening.
Why this matchesConditional option
Role
Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand.
Conditions
Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
Before purchase
Tannery & Leather Wastewater: Active components; Alkalinity; Form; Process compatibility; Consider segregated stream sources, chromium oxidation states, sulfides, COD, pH and sludge treatment.
A ferrous salt option for specified reduction, sulfide-control and water treatment steps.
Why this matchesConditional option
Role
Inorganic salt coagulation creates separable particles and affects downstream sludge production and alkalinity demand.
Conditions
Compare pH, alkalinity, effective metal content and representative coagulation trials. Ferrous salts also require defined oxidation and downstream separation conditions.
Nitrogen, phosphorus or other nutrient formulations for industrial biological treatment with an identified nutrient deficit.
Why this matchesConditional option
Role
Supplies nutrients where an actual nitrogen, phosphorus or micronutrient deficit exists in the influent; it is not a default addition for all wastewater.
Conditions
Have bioavailable carbon, nitrogen and phosphorus analysis and a nutrient-demand assessment available, avoiding added effluent nitrogen or phosphorus loads.
Supporting formulations for specified biological treatment recovery and enhancement tasks.
Why this matchesConditional option
Role
A supporting formulation route for specified biological treatment recovery or enhancement.
Conditions
Define microbial strains/composition, activity and limiting factors. This does not replace investigation of loading, dissolved oxygen, toxicity or nutrient causes.
Industry references describe general uses. Product specifications, certifications and application results require the corresponding supplier documentation.
PURCHASING QUESTIONS
More questions, answered.
How should I select water-treatment products for Tannery & Leather Wastewater?
Assess chromium-bearing, sulfide-bearing and general wastewater separately rather than treating different streams as one operating condition.
What information helps select products for this application?
Assess chromium-bearing, sulfide-bearing and general wastewater streams separately. Consider reduction only when hexavalent chromium is detected; trivalent chromium requires precipitation and separation assessment. No universal dose or treatment result is implied. Product options may serve primary, supporting, conditional or alternative roles.
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