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<p>Electrochemical coagulation (ECC) experiments were carried out to treat raw dental wastewaters (DWW) using two dimensional Copper (Cu) metal plate electrodes. Raw DWW sampling showed two different characteristic streams—acidic and near neutral. The operating variables for treating raw DWW were: pH 3.93 and 6.62, COD 3200 and 8000&#xa0;mg/L, TA 60 and 136&#xa0;mg/L, Cl<sup>−</sup> 305–391&#xa0;mg/L and TDS 600 and 636&#xa0;mg/L respectively. The applied cell current was 0.3 and 0.7A. Acidic raw DWW (DWW-A) stream showed relatively fair COD reduction than TDS, chloride and total alkalinity; while near neutral raw DWW stream (DWW-N) showed reasonably high reduction of target pollutants/contaminants from the waste stream. The DWW-N stream showed TDS reduction rates of 31% for 0.3A and 43% for 0.7A at 60&#xa0;min electrolysis time (ET). COD removal for DWW-A was 80% for 0.3A and 90% for 0.7A; whereas for DWW-N, COD reduction rates were 94% for 0.3A and 98% for 0.7A, respectively. Chloride concentration increased at higher current for DWW-A stream; and for DWW-N stream, chloride utilization was 69% and 88% for 0.3A and 0.7A at 60&#xa0;min hydraulic retention time / ET. ECC dry sludge obtained treating DWW-N ranged from 62 to 128&#xa0;g/m<sup>3</sup> respectively. It was concluded that ECC can serve as a ‘pre-treatment’ option when raw dental waste stream is acidic for discharge, into sewers; and as a ‘main treatment’ for raw DWW at its near neutral pH<sub>o</sub>.</p>

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Electrochemical coagulation of raw dental wastewaters using copper electrodes

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Sahana Mahesh,
  • Krishna Benamanahalli Motaiah,
  • Mahesh Shivaswamy,
  • Vikram Kumar Jain Shanthilal,
  • Pushpa Tuppad,
  • P. C. Srinivas

摘要

Electrochemical coagulation (ECC) experiments were carried out to treat raw dental wastewaters (DWW) using two dimensional Copper (Cu) metal plate electrodes. Raw DWW sampling showed two different characteristic streams—acidic and near neutral. The operating variables for treating raw DWW were: pH 3.93 and 6.62, COD 3200 and 8000 mg/L, TA 60 and 136 mg/L, Cl− 305–391 mg/L and TDS 600 and 636 mg/L respectively. The applied cell current was 0.3 and 0.7A. Acidic raw DWW (DWW-A) stream showed relatively fair COD reduction than TDS, chloride and total alkalinity; while near neutral raw DWW stream (DWW-N) showed reasonably high reduction of target pollutants/contaminants from the waste stream. The DWW-N stream showed TDS reduction rates of 31% for 0.3A and 43% for 0.7A at 60 min electrolysis time (ET). COD removal for DWW-A was 80% for 0.3A and 90% for 0.7A; whereas for DWW-N, COD reduction rates were 94% for 0.3A and 98% for 0.7A, respectively. Chloride concentration increased at higher current for DWW-A stream; and for DWW-N stream, chloride utilization was 69% and 88% for 0.3A and 0.7A at 60 min hydraulic retention time / ET. ECC dry sludge obtained treating DWW-N ranged from 62 to 128 g/m3 respectively. It was concluded that ECC can serve as a ‘pre-treatment’ option when raw dental waste stream is acidic for discharge, into sewers; and as a ‘main treatment’ for raw DWW at its near neutral pHo.