Colored Oily Industrial Wastewater
Suitable for evaluation where visible color and dispersed oil occur together, especially when bentonite consumption or sludge generation is high.
Bluwat BWD-01 Water Decoloring Agent
Alternative to Bentonite for Colored Oily Wastewater
A concentrated cationic organic polymer designed for difficult colored wastewater containing dyes, pigments, emulsified substances and negatively charged colloidal particles.
55% minSolid content
30-250 cpsViscosity at 25 C
CAS 55295-98-2Dicyandiamide-formaldehyde resin
01
Product Overview
BWD-01 is a concentrated cationic organic polymer based on dicyandiamide-formaldehyde resin. It is developed for the treatment of difficult colored wastewater containing dispersed pigments, dyes, emulsified substances and negatively charged colloidal particles.
In selected oily wastewater treatment systems, BWD-01 can replace part or all of the bentonite traditionally used as a mineral adsorbent. The appropriate replacement ratio depends on oil content, color source, emulsion stability, pH and the other chemicals used in the treatment process.
BWD-01 should be evaluated through a comparative jar test before
full-scale application. It is not presented as a universal
replacement for bentonite or as a stand-alone demulsifier for every
type of oily wastewater.
02
Why Bentonite May Underperform
Common Bentonite Limitations
Physical adsorption may not effectively remove dissolved dyes and
stable emulsions.
High dosage can introduce large quantities of mineral solids.
Sludge volume and dewatering pressure may increase.
Performance may fluctuate when color, oil or surfactant loading
changes.
BWD-01 Treatment Approach
Strong cationic charge neutralization.
Destabilization of negatively charged dyes and colloids.
Compatible with PAC and anionic PAM.
Potential reduction in mineral solids entering the sludge system.
03
BWD-01 Treatment Solution
BWD-01 provides strong cationic charge neutralization. It destabilizes negatively charged colored molecules and fine colloidal particles so that they can combine into larger aggregates.
When used with PAC and a small amount of anionic polyacrylamide, BWD-01 can support faster floc formation, more complete settling and clearer treated water.
Faster color removal than bentonite-only treatment
Lower mineral adsorbent consumption
Less inorganic material entering sludge
Faster flocculation and sedimentation
Improved treated-water clarity
More stable operation under changing color loads
Potentially lower sludge-handling pressure
Under suitable conditions, existing applications may achieve
approximately 50% to 99% color removal and 50% to 80% COD
reduction. Actual results depend on wastewater composition, dosage,
pH, mixing conditions and the complete treatment process. These
values are not guaranteed performance figures.
04
Product Specifications
| Item | Specification |
|---|---|
| Product Name | BWD-01 Water Decoloring Agent |
| Chemical Type | Cationic organic polymer |
| Main Component | Dicyandiamide-formaldehyde resin |
| CAS Number | 55295-98-2 |
| Appearance | Colorless to light-colored translucent liquid |
| Solid Content | 55% min |
| Viscosity at 25 C | 30-250 cps |
| pH Value, 30% Solution | 3.0-6.0 |
| Specific Gravity at 20 C | 1.20-1.25 |
| Water Solubility | Completely soluble in water |
| Recommended Storage | 0-35 C |
| Standard Packaging | 30 kg drum, 250 kg drum or 1250 kg IBC |
The values above represent the standard BWD-01 product range. Final supply specifications should be confirmed through the batch certificate of analysis.
05
Application Scenarios
Paint and Coating Wastewater
Helps neutralize fine pigments, resins and dispersants that remain stable after conventional coagulation.
Printing Ink and Pigment Wastewater
Supports removal of highly dispersed pigments and negatively charged color bodies that are difficult to settle.
Metalworking Fluid Wastewater
Can be incorporated into a combined program for color, emulsified organics and fine suspended particles.
Mixed Industrial Effluent
Can be tested in centralized systems where color and colloidal contamination vary between batches.
When oil removal is the primary problem, a suitable demulsifier
should normally be tested before BWD-01.
06
How BWD-01 Works
1. Charge Neutralization
Cationic groups neutralize negatively charged dyes, pigments and colloidal particles.
2. Particle Destabilization
Electrostatic repulsion is reduced, allowing contaminants to form small aggregates.
3. PAC Coagulation
PAC can support coagulation and capture additional suspended impurities.
4. PAM Bridging
Anionic polyacrylamide bridges small aggregates into larger and stronger flocs.
5. Solid-Liquid Separation
Flocs are removed by sedimentation, dissolved air flotation or another separation process.
Because BWD-01 is an organic liquid chemical, it does not introduce mineral solids in the same way as bentonite. This may reduce inorganic sludge generation when the program is properly optimized.
07
Recommended Jar-Test Method
Characterize the wastewaterRecord pH, color, COD, oil and grease, and suspended solids.
Prepare BWD-01 working solutionDilute BWD-01 approximately 1:40 to 1:50 to prepare a 2% to 2.5%
working solution.
Prepare PAC separatelySelect the PAC grade and prepare it according to the treatment
requirement.
Prepare anionic PAMPrepare approximately 0.1% solution and allow complete dissolution.
Screen the pHUse pH 8 to 10 as an initial range and test nearby values.
Add PACMix rapidly for approximately 1 to 3 minutes.
Add diluted BWD-01Mix sufficiently for approximately 5 to 10 minutes.
Add anionic PAMMix slowly until large, visible flocs form.
Evaluate separationAllow settling or test the intended solid-liquid separation
process.
Measure final performanceCompare color, COD, oil and grease, turbidity, settling speed and
sludge volume.
Do not mix concentrated BWD-01 directly with PAC or polyacrylamide
in the same storage tank. Prepare and dose each chemical
separately.
08
How to Choose the Correct Treatment Program
Identify the Main Problem
Use BWD-01 primarily for color and negatively charged contaminants. Test a demulsifier first when free oil or stable emulsion is dominant.
Compare Full and Partial Replacement
Include a bentonite control, partial replacement and complete replacement in the jar test.
Evaluate More Than Color
Compare COD, oil and grease, turbidity, settling speed, sludge volume, dewatering and total chemical cost.
Match Downstream Equipment
Floc requirements differ for sedimentation, DAF, belt presses and chamber filter presses.
Confirm Through a Plant Trial
Monitor chemical consumption, treated-water quality and sludge production over several production cycles.
09
BWD-01 Compared with Bentonite
| Evaluation Point | Bentonite | BWD-01 |
|---|---|---|
| Product Form | Mineral powder | Water-soluble liquid |
| Primary Action | Physical adsorption | Charge neutralization and coagulation |
| Preparation | Powder dispersion required | Easy dilution with water |
| Mineral Solids Added | Relatively high | Low |
| Sludge Impact | May increase inorganic sludge | May reduce mineral sludge contribution |
| Color Removal | Depends strongly on adsorption | Effective for many anionic color bodies |
| Dosage Control | May require high dosage | Optimized through jar testing |
| Best Use | Suspended or adsorbable contaminants | Colored and negatively charged contaminants |
Performance depends on actual wastewater conditions. This comparison does not mean that BWD-01 will replace bentonite in every treatment system.
10
Why Choose Bluwat Chemicals
Bluwat Chemicals has manufactured and exported water treatment chemicals since 2000. We operate three production bases and supply industrial customers in more than 80 countries.
BWD-01 production is controlled through routine testing of solid content, viscosity, pH, specific gravity and appearance. Batch certificates of analysis can be supplied for quality verification.
25+ years of manufacturing and export experience
Three manufacturing bases in China
Quality and environmental management systems
ZDHC-compliant product options
Batch testing and certificate of analysis
Free samples for laboratory evaluation
Jar-test and dosage optimization support
Flexible drum and IBC packaging
Shipment experience covering 80+ countries
11
Frequently Asked Questions
Can BWD-01 completely replace bentonite?
It may replace part or all of the bentonite in suitable colored oily wastewater, but the result depends on wastewater composition. A comparative jar test is necessary before complete replacement.
Does BWD-01 remove both oil and color?
Its main function is color removal and destabilization of negatively charged colloidal contaminants. Highly emulsified or high-oil wastewater may still require a demulsifier before BWD-01 treatment.
What is the recommended BWD-01 dosage?
There is no universal dosage because color, COD, oil content, pH and competing chemicals vary. Dosage should be determined by jar testing and confirmed through a controlled plant trial.
Why is BWD-01 used with PAC and anionic polyacrylamide?
BWD-01 neutralizes colored contaminants, PAC supports coagulation, and anionic polyacrylamide builds larger flocs for faster separation.
Can BWD-01 reduce sludge production?
Replacing a mineral adsorbent with an organic liquid polymer may reduce inorganic solids added to the system. Final sludge volume still depends on contaminant load, chemical dosage and the separation process.
