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Home-Textile and Woven-Fabric Dyeing
Effluent from home-textile and woven-fabric production containing residual color from preparation, dyeing and washing stages.
Bluwat BWD-01 Water Decoloring Agent
Textile Dyeing Wastewater Treatment in Pakistan
A cationic decoloring solution for reactive and direct cotton dye wastewater, designed to improve soluble-color removal, floc formation and reliable solid-liquid separation after equalization and pH control.
50% minSolid content
pH 7.5-8.0Recommended starting range
30 / 250 / 1250 kgStandard packaging
01
Product Overview
Textile wet processing in Pakistan 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 cotton dyes.
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 Pakistan
Combined bleaching, dyeing and washing streams create high pH swings, residual color and variable CODcr. 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
Caustic and peroxide carryover from preparation changes coagulation conditions.
Unfixed cotton dyes remain dissolved after multiple rinsing stages.
Mixing concentrated dye-bath dumps with general wash water creates uneven loading at the clarifier.
03
BWD-01 Treatment Solution
Equalize the wastewater, establish a stable pH before dosing, and use BWD-01 to target soluble anionic color that is not removed by settling alone.
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
Cotton Yarn Dyeing
Wastewater containing strong direct or reactive shades from cotton yarn dyeing operations.
Combined Bleaching, Dyeing and Washing
Mixed wastewater after equalization and pH control, where soluble anionic color remains after primary treatment.
06
How BWD-01 Works
Cationic groups interact with negatively charged reactive and direct cotton 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
Verify that residual peroxide or extreme alkalinity has been controlled before the jar test.
Compare the treatment of concentrated dye-bath dumps and equalized influent.
Check whether PAC improves floc density without creating excessive sludge.
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 management systems
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
Can BWD-01 be dosed directly into strongly alkaline dye wastewater?
The TDS recommends adjusting wastewater to pH 7.5-8.0 for better results. Strong alkalinity should be controlled before final optimization because pH changes the charge balance and apparent dosage.
Does bleaching wastewater always need BWD-01?
Not necessarily. Bleaching streams may have low color but high pH or oxidant residual. BWD-01 should be focused on colored combined wastewater or dye-rich streams after basic process control.
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.