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Cotton Yarn Dyeing
Reactive and direct dye wastewater with high dissolved color and strong first-rinse loading.
Bluwat BWD-01 Water Decoloring Agent
Textile Dyeing Wastewater Treatment in India
A cationic decoloring solution for cotton reactive and direct dye wastewater, designed to improve charge neutralization, floc formation and reliable solid-liquid separation under changing batch conditions.
50% minSolid content
pH 7.5-8.0Recommended starting range
30 / 250 / 1250 kgStandard packaging
01
Product Overview
Textile wet processing in India does not create one uniform wastewater. Fiber type, dye class, shade depth, washing recipe and finishing chemistry can change the color and charge demand from one production batch to the next.
BWD-01 supplies strong cationic charge to destabilize negatively charged soluble dyes and fine color-bearing particles. It is especially relevant to reactive and direct dyes used on cotton.
The objective is not merely to make the sample look clearer, but to produce flocs that can be separated reliably by sedimentation or dissolved-air flotation.
02
Textile Wastewater Problem in India
High residual color and COD remain after dye fixation, washing and soaping, while salt-rich water makes treatment control difficult. Conventional inorganic coagulation may remove suspended solids but leave a visible soluble-color fraction.
Operators may then increase coagulant dosage, creating more sludge without proportional color improvement.
Why the Problem Occurs
Unfixed reactive dye is highly water soluble and leaves the fiber during rinsing and soaping.
Dyeing salts, wetting agents and detergents increase ionic strength and interfere with simple inorganic coagulation.
Batch production creates concentrated first-rinse streams followed by more dilute wastewater, producing large load swings.
03
BWD-01 Treatment Solution
Apply BWD-01 to neutralize anionic color bodies and use equalization plus controlled pH to prevent overdosing during the low-color part of the batch.
The selected program should be based on actual wastewater rather than a universal dose. A controlled jar test identifies the point where charge neutralization, floc formation, separation speed and sludge production are balanced.
PAC can be tested before or after BWD-01, but the two products must be prepared and dosed separately.
04
Technical Specifications
| Property | BWD-01 Specification |
|---|---|
| Chemical Name | Quaternary ammonium cationic polymer |
| Appearance | Colorless to yellowish translucent liquid |
| Solid Content | 50% min |
| Specific Gravity at 20 C | 1.1-1.3 |
| pH Value, 30% Solution | 3-6 |
| Viscosity at 25 C | 30-300 cps |
| Solubility | Soluble with water at any rate |
| Storage Temperature | 0-35 C |
| Standard Package | 30 kg or 250 kg plastic drum; 1250 kg IBC |
Technical note: Values are based on the Bluwat BWD-01 TDS. Confirm the supplied batch with its Certificate of Analysis and consult the SDS for handling and shelf-life details.
05
Recommended Application Scenarios
Fabric Dyeing and Printing
Residual red, blue and black shades after fixation, washing and soaping.
Garment Washing Effluent
Mixed streams blended with cotton wet-processing wastewater and varying auxiliary loads.
06
How BWD-01 Works
Cationic groups interact with negatively charged reactive and direct dyes and colored colloids.
Reduced electrostatic repulsion allows dissolved or finely dispersed color bodies to associate.
Destabilized contaminants form visible aggregates; PAC may strengthen or densify flocs where testing supports it.
The resulting flocs are removed by sedimentation or air flotation, producing clearer treated water.
07
How to Choose and Test BWD-01
Test first-rinse and equalized wastewater separately to understand peak demand.
Do not use apparent color as a substitute for CODcr and sludge measurements.
Where PAC is required, test both dosing orders and keep the working solutions separate.
Use untreated and current-treatment controls in every jar-test series. Record raw-water pH, true or apparent color, CODcr, turbidity, temperature and production source. Photographs are useful, but analytical results and sludge behavior are required for a defensible selection.
08
Recommended Application Procedure
Collect representative wastewaterTake the sample after appropriate screening and equalization.
Prepare BWD-01 working solutionsDilute the product with 10 to 40 times clean water.
Screen wastewater pHUse pH 7.5-8.0 as the TDS starting range, then test nearby values where necessary.
Dose BWD-01Add it to the wastewater and mix thoroughly for several minutes.
Test PAC sequenceWhere color and CODcr remain high, test PAC before and after BWD-01 in separate beakers. Do not premix the chemicals.
Evaluate separationAllow flocs to settle or evaluate them by dissolved-air flotation, matching the full-scale process.
Compare final performanceReview color, CODcr, turbidity, floc strength, separation time, sludge volume and total treatment cost before scale-up.
09
Expected Treatment Results
The BWD-01 TDS reports typical performance ranges in suitable applications. These are reference values rather than guaranteed results.
50%-99%Typical decolorization reference range
50%-80%Typical CODcr reduction reference range
Actual performance depends on dye class, concentration, auxiliaries, pH, mixing, chemical sequence and separation equipment.
Compared with a high-dose inorganic-only program, BWD-01 may provide faster flocculation and settling and may reduce the inorganic contribution to sludge. Where sludge reduction is a project objective, compare dry solids, dewatering behavior and disposal cost.
10
Bluwat Manufacturing Advantages
Manufacturer since 2000 with 25+ years of production and export experience
Three production bases supporting stable supply and batch control
Products exported to 80+ countries
Used by 5,000+ industrial customers
ISO 9001 quality management support
ZDHC-conformant BWD product support
Routine quality control supported by batch COA
Free samples and jar-test technical support
30 kg, 250 kg drum and 1250 kg IBC packaging
For Asian textile markets, Bluwat supports drum and IBC shipments, production planning for regular consumption, and remote jar-test review using customer wastewater data and treatment photographs.
11
Frequently Asked Questions
Does BWD-01 remove textile salt from Indian cotton dyeing wastewater?
No. BWD-01 is selected for color removal, flocculation and associated COD reduction; it is not a desalination chemical. Conductivity or TDS control requires segregation, reuse, membrane treatment or another salt-management process.
Why should first-rinse water be tested separately?
First-rinse water often carries the highest unfixed dye concentration. Testing it separately shows peak chemical demand and helps determine whether flow equalization or source segregation will make dosing more stable.
What is the recommended BWD-01 dilution and wastewater pH?
The TDS recommends dilution with 10 to 40 times water and identifies wastewater pH 7.5-8.0 as a useful starting range. Final dilution, pH and dosage must be confirmed using the actual effluent.
Can BWD-01 be mixed directly with polyaluminum chloride?
No. BWD-01 and PAC should be prepared and dosed separately. PAC may be added before or after BWD-01 depending on the flocculation test and treatment process, but the concentrates should not be premixed.
How should the final BWD-01 dosage be selected?
Use a jar test with representative wastewater. Compare color, CODcr, turbidity, floc size, separation time and sludge volume. The best operating dose is the lowest stable dose that meets the plant's complete treatment objective.