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Cotton Knit and Woven-Fabric Reactive-Dye Effluent
Suitable for soluble unfixed reactive-dye color from cotton knit and woven-fabric dyeing, rinsing and soaping operations.
Bluwat BWD-01 Water Decoloring Agent
Textile Wastewater Treatment in Brazil
A practical cationic decoloring solution for cotton reactive-dye, denim and integrated textile wastewater, designed to improve clarification after equalization while supporting separate operating windows for major production streams.
50% minSolid content
pH 7.5-8.0Recommended starting range
30 / 250 / 1250 kgStandard packaging options
01
Product Overview
Textile wet processing in Brazil 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, direct and denim-associated color.
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 Brazil
Large production diversity creates mixed soluble color, fine solids and changing chemical demand.
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
Cotton reactive-dye wastewater contains soluble unfixed color.
Denim and garment processing adds fibers, detergents and color-bearing particles.
Mixed product schedules make fixed-dose inorganic coagulation inefficient.
03
BWD-01 Treatment Solution
Apply BWD-01 after equalization and use separate dosage guidance for cotton reactive-dye and denim-processing streams.
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
Denim Dyeing, Washing and Finishing Wastewater
Can support treatment of denim-associated color, fibers, detergents and color-bearing particles from washing and finishing.
Integrated Textile ETPs
Can be evaluated for treatment plants receiving wastewater from several production departments with changing color and chemical demand.
06
How BWD-01 Works
Cationic groups interact with negatively charged reactive, direct and denim-associated color 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 the 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
Build at least two operating windows: reactive cotton and denim.
Track rain or process-water dilution that changes influent concentration.
Measure sludge production when reducing inorganic coagulant dosage.
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 if 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 and ISO 14001 management systems
ZDHC-conformant BWD product support
Routine quality control supported by batch COA
Free samples and jar-test support
30 kg, 250 kg drum and 1250 kg IBC packaging
For customers in the Americas, Bluwat supports sample evaluation, container-load planning, stable batch specifications and technical communication for distributors, textile groups and individual mills.
11
Frequently Asked Questions
Can one trial represent both cotton and denim production?
A combined sample is useful for the final ETP, but separate source samples explain the demand. Test both before setting the operating window.
Why should wastewater dilution be recorded?
Flow dilution can lower apparent color and CODcr without changing the total pollutant load. Concentration and flow should be considered together when setting feed rates.
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 dose 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.