Photoresist wastewater from semiconductor lithography and cleaning processes is notoriously difficult to treat. A typical facility generating 200 m³/day of this wastewater faces a daunting challenge: high concentrations of photoresist residues, isopropyl alcohol (IPA), and dimethyl sulfoxide (DMSO). These organics push the chemical oxygen demand (COD) to around 8,000 mg/L while the B/C ratio remains below 0.25, indicating very poor biodegradability. Conventional biochemical plus flocculation treatment often fails, leaving effluent COD above 1,000 mg/L, persistent turbidity, and severe fouling of reverse osmosis membranes.
The core problem is the stable emulsion formed by photoresist polymers and solvents. Standard coagulants cannot break these emulsions, allowing dissolved organics to pass through treatment and foul downstream equipment. A specialized demulsifier for photoresist wastewater treatment offers the solution.
In a laboratory trial, 100 mL of raw photoresist wastewater was treated with a customized photoresist demulsifier, followed by a small dose of PAM flocculant. Within minutes, rapid demulsification occurred – the tightly bound emulsion released its captive water. Fine photoresist particles and solvent droplets coalesced into large, dense flocs. After just 10 minutes of settling, the supernatant was crystal clear.
The results were striking. The industrial demulsifier completely decomposed photoresist residues and solvents within 15 minutes. COD reduction was significant, bringing effluent quality well below reuse standards. Unlike traditional agents, this demulsifier for wastewater specifically targets the complex polymer structures found in photoresist formulations, breaking them into smaller, settleable fragments that no longer foul membranes.
Operational advantages are equally important. The treated water protects RO membranes from organic fouling, extending equipment life and reducing cleaning frequency. Chemical dosage costs drop by approximately 30% compared to conventional treatment schemes – a substantial saving for a 200 m³/day facility.
For semiconductor and electronics manufacturers, effective photoresist wastewater treatment is no longer a luxury. With a targeted industrial wastewater treatment demulsifier, plants can achieve stable reuse water quality, lower operating costs, and reliable compliance.
As a professional chemicals manufacturer in the water treatment Industry, Sanmei have helped more than 5,000 plants with process solutions and helped them improve production efficiency, reduce costs, and optimize profit plans. Our main goal is to assist you in optimizing production efficiency and profitability in a sustainable way. Welcome to consult us and get a free wastewater treatment solution by filling in the form below or email to sales@san-mei.com.
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