Efficient Paint Wastewater Treatment: Lab Test with Bluwat Chemicals

Industrial paint wastewater poses a significant challenge for environmental compliance due to its intense color, suspended solids, and high chemical oxygen demand (COD). At Bluwat Chemicals, we are constantly innovating and testing practical solutions in our laboratory to help industries meet discharge regulations efficiently and cost-effectively.

Here’s a quick overview of a recent lab-scale treatment we performed on paint wastewater, demonstrating the effectiveness of our decolorization process:

Step 1: Add Bluwat Compound Decoloring Agent

• Begin by adding the compound decoloring agent (such as Bluwat BWD-01) directly into the paint wastewater.
• Stir the solution for about 3–5 minutes to ensure thorough mixing.
• This step helps to break down and remove colorants, binders, and suspended solids present in the paint effluent.

Step 2: Adjust pH to Neutral (pH 7–8)

• Use sodium hydroxide (NaOH) or diluted hydrochloric acid (HCl) to adjust the pH of the wastewater.
• Slowly add the pH-adjusting agent while stirring and monitor with a pH meter or pH paper.
• A neutral pH helps to optimize the performance of coagulants and flocculants in the following step.

Step 3: Add Polyacrylamide Flocculant

• After the pH is adjusted, add a small amount of polyacrylamide (PAM) solution, either cationic or anionic, depending on the wastewater characteristics.
• Stir gently for another 2–3 minutes.
• You will observe large flocs forming as particles bind together and settle quickly.
• This step is critical for solid-liquid separation and improves sludge dewatering efficiency.