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Cotton reactive-dye effluent
Cotton yarn and fabric wastewater containing soluble unfixed reactive dyes.
Bluwat BWD-01 Water Decoloring Agent
BWD-01 for Cotton Dyeing and Textile Wastewater Treatment in Egypt
A jar-test-driven organic decolorant program for reactive and direct dyes used on cotton, home-textile printing wastewater and mixed wet-processing effluent after pH stabilization.
50% min Solid content
pH 7.5-8.0 Recommended starting range
30 / 250 / 1250 kg Standard packaging options
Product Overview
Cotton wet processing creates changing color and charge demand
Textile wet processing in Egypt 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.
Textile Wastewater Problem in Egypt
Deep shades and rinsing can leave persistent soluble color
The central treatment problem is that deep cotton shades and extensive rinsing create soluble residual color and CODcr that may remain after conventional coagulation. Inorganic coagulants may remove suspended solids while leaving a visible soluble-color fraction. Increasing coagulant dosage can then create more sludge without proportional color improvement.
BWD-01 Treatment Solution
Equalize and adjust the wastewater to the TDS starting pH range, then use BWD-01 to target dissolved anionic color.
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 both products must be prepared and dosed separately.
Why the Problem Occurs
- Unfixed reactive dye leaves the cotton during rinsing and soaping.
- Salts and auxiliaries alter the wastewater's ionic environment.
- High-pH preparation streams can disturb the optimum decolorization range.
Technical Specifications
BWD-01 product data
| 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.
Recommended Application Scenarios
Where BWD-01 can be evaluated
Home-textile printing and washing
Color-bearing wastewater from home-textile printing, rinsing and machine cleaning operations.
Mixed cotton wet-processing wastewater
Equalized dyeing, washing and finishing streams after pH stabilization.
How BWD-01 Works
Four stages from charge neutralization to separation
Charge neutralization
Cationic groups interact with negatively charged reactive and direct dyes used on cotton and colored colloids.
Destabilization
Reduced electrostatic repulsion allows dissolved or finely dispersed color bodies to associate.
Floc formation
Destabilized contaminants form visible aggregates. PAC may strengthen or densify flocs where testing supports it.
Solid-liquid separation
The resulting flocs are removed by sedimentation or dissolved-air flotation to produce clearer treated water.
How to Choose and Test BWD-01
Control pH, shade depth and salt expectations
Check pH first
Measure and record wastewater pH before every dosage comparison.
Separate dark shades
Test concentrated dark-shade wastewater separately from the general equalized stream.
Define the salt limitation
BWD-01 targets color and flocculation; it does not remove dissolved textile salts.
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.
Recommended Application Procedure
Seven-step jar-test and scale-up workflow
1
Collect the sample
Collect representative wastewater after appropriate screening and equalization.
2
Prepare working solutions
Dilute BWD-01 with 10 to 40 times clean water and prepare several test concentrations.
3
Adjust the starting pH
Use pH 7.5-8.0 as the TDS starting range, then test nearby values where necessary.
4
Dose and mix
Add BWD-01 to the wastewater and mix thoroughly for several minutes.
5
Compare PAC sequence
Test PAC before and after BWD-01 in separate beakers. Do not premix the chemicals.
6
Evaluate separation
Allow flocs to settle or evaluate them by DAF, matching the site's full-scale process.
7
Compare total performance
Review final color, CODcr, turbidity, floc strength, separation time, sludge volume and treatment cost.
Expected Treatment Results
Reference performance ranges from the BWD-01 TDS
50%-99% Typical decolorization reference range
Actual removal depends on dye class, concentration, auxiliaries, pH, mixing, chemical sequence and separation equipment.
50%-80% Typical CODcr reduction reference range
These values are indicative for suitable applications and are not guaranteed operating results.
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 rather than wet sludge volume alone.
Bluwat Manufacturing Advantages
Manufacturing, documentation and African project support
25+ years of manufacturing experience
Manufacturer since 2000 with long-term water-treatment chemical production and export experience.
Three production bases
Multiple production sites support stable supply, batch control and flexible packaging options.
Global application experience
Products exported to more than 80 countries and used by over 5,000 industrial customers.
Quality and environmental systems
ISO 9001 and ISO 14001 systems with ZDHC-conformant BWD product support.
Routine batch quality control
Appearance, solid content, specific gravity, pH, viscosity and solubility are supported by batch COA.
Jar-test technical support
Free samples and support for dosage comparison, chemical sequence and full-scale trial planning.
Flexible packaging
Standard BWD-01 supply in 30 kg and 250 kg plastic drums or 1250 kg IBC containers.
African textile project support
Practical dilution and dosing procedures, sample-based selection, drum or IBC planning and commissioning support for new or expanding ETPs.
Frequently Asked Questions
Practical BWD-01 questions for Egyptian textile mills
Does BWD-01 remove salt from cotton dyeing wastewater?
No. It targets color, flocculation and associated COD reduction. Salt control requires source reduction, reuse or a separate desalination process.
Why is pH stabilization important for Egyptian cotton mills?
Preparation and dyeing streams can have different pH values. A stable starting pH makes the charge-neutralization test repeatable and reduces false dosage conclusions.
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 for better results. The final dilution, pH and dose must be confirmed with 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.