NiuYating,HongShan,GaoYuan,et al.Pretreatment of Leachate Concentrate by Flocculation Combined with Chemical Softening[J].China Water & Wastewater,2026,42(17):111-116.
絮凝+化学软化对渗滤液浓缩液的预处理效果
- Title:
- Pretreatment of Leachate Concentrate by Flocculation Combined with Chemical Softening
- 摘要:
- 渗滤液浓缩液中高浓度有机物和硬度是造成MVR蒸发器设备起泡、腐蚀和结垢的主要原因。本研究采用絮凝+化学软化进行预处理，分析对浓缩液中有机物及Ca2+、Mg2+的去除效果。结果表明，在搅拌速率为60 r/min、搅拌时间为20 min、pH为5、絮凝剂（SC-101L）投加量为10 mL/L的条件下，絮凝效果最佳，COD去除率为77.63%。调整浓缩液pH为12、Na2CO3投加量为理论投加量的120%时，对Ca2+、Mg2+和总硬度的去除效果最佳，去除率分别为92.93%、99.97%和98.84%。絮凝+化学软化组合预处理可以显著降低浓缩液中有机物及Ca2+、Mg2+的浓度。生产性试验结果表明，经絮凝+化学软化除硬预处理后，MVR蒸发器浓缩液处理能力提升50%，产水率达到80%以上，产浓率为20%。可见，采用絮凝+化学软化除硬的浓缩液预处理技术可行，对于缓解MVR蒸发器设备结垢和腐蚀具有积极意义。
- Abstract:
- The high concentrations of organic matter and hardness in leachate concentrate are the primary causes of foaming, corrosion, and scaling in MVR evaporator equipment. In this study, flocculation combined with chemical softening was employed as a pretreatment to evaluate the removal efficiencies of organic matter, Ca2+, and Mg2+ from the concentrate. The results showed that under the conditions of a stirring rate of 60 r/min, stirring time of 20 min, pH of 5, and flocculant (SC-101L) dosage of 10 mL/L, the flocculation effect was optimal, achieving a COD removal rate of 77.63%. When the pH of the concentrate was adjusted to 12 and the Na2CO3 dosage was set at 120% of the theoretical dosage, the removal efficiencies of Ca2+, Mg2+, and total hardness reached their optimal levels, with removal rates of 92.93%, 99.97%, and 98.84%. The combined flocculation and chemical softening pretreatment significantly reduced the levels of organic matter, Ca2+, and Mg2+ in the concentrate. Production test results demonstrated that after the flocculation and chemical softening pretreatment for hardness removal, the processing capacity of the MVR evaporator for the concentrate increased by 50%, with a water production rate exceeding 80% and a concentrate production rate of 20%. These findings indicate that the pretreatment technology of flocculation combined with chemical softening for hardness removal is feasible and holds positive significance for mitigating scaling and corrosion in MVR evaporator equipment.
相似文献/References:
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