PAC in Textile Wastewater Treatment

The textile and dyeing industry is one of the largest consumers of water and producers of wastewater worldwide. Due to the extensive use of dyes, auxiliaries, and chemicals, the wastewater is highly polluted and difficult to treat. Without an effective treatment plan, it is nearly impossible to meet discharge standards.

Common Problems in Textile Wastewater

     √ High color caused by residual dyes;

     √ High COD and BOD from organic pollutants;

     √ Fluctuating pH depending on process steps;

     √ High salinity, which reduces coagulant performance.

These factors make textile wastewater treatment highly challenging.

Advantages of Polyaluminum Chloride (PAC)

     √ Polyaluminum chloride (PAC) is a highly efficient inorganic coagulant widely used for textile wastewater color removal and COD reduction.

     √ Strong decolorization: Breaks down dye molecules and reduces color intensity;

     √ COD/BOD removal: Adsorbs and flocculates organic pollutants;

     √ pH adjustment: Helps stabilize wastewater quality;

     √ Fast settling: Forms large and dense flocs for efficient sludge separation.

After PAC treatment, wastewater becomes clearer and odor-free, with COD and BOD levels greatly reduced.

Case Study: 28% Granular PAC in Textile Wastewater Treatment

We supplied a Sri Lankan textile factory with different PAC models. The customer reported that 28% granular PAC worked exceptionally well in their dyeing wastewater treatment.

Compared to powder PAC, granular PAC dissolves slower but is easier to dose, safer to transport, and more stable to store. Powder PAC tends to clump or melt in hot and humid climates, making it less suitable for long-term storage.

👉 Interested in trying 28% granular PAC? Contact us for samples.
👉 Want to learn more about PAC? Click the link below.

Common problems and solutions of polyaluminium chloride

Effect of basicity on PAC

How does PAC affect sludge settling?

Why does the water become turbid after adding PAC?

FAQ

Q1: Why is PAC suitable for textile and dyeing wastewater?
A1: PAC offers strong coagulation and decolorization for high-COD, high-color wastewater.

Q2: What is the typical PAC dosage?
A2: Normally between 50–200 mg/L, determined by jar tests.

Q3: Can PAC be used alone?
A3: Yes, but better results are achieved when combined with PAM (polyacrylamide).

Q4: Does PAC affect pH?
A4: PAC helps neutralize wastewater, stabilizing pH for further treatment.

Q5: What advantages does PAC have over other coagulants?
A5: PAC produces dense, fast-settling flocs, improves treatment efficiency, and is less corrosive to equipment.