HEMeng-fan,WUBao-qiang,WANGYu,et al.Classified Treatment Process for Mechanical Processing Waste Emulsion and Anti-impact Load Operation Strategy[J].China Water & Wastewater,2025,41(6):122-129.
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Classified Treatment Process for Mechanical Processing Waste Emulsion and Anti-impact Load Operation Strategy

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第41卷 Number: 第6期 Page: 122-129 Column: Date of publication: 2025-03-17
Author(s):
HE　Meng-fan1;  WU　Bao-qiang1;  WANG　Yu2;  LU　Bin1;  HUANG　Xiang-feng1;  ZHENG　Wei-wei1;  XUE　Jia2;  YANG　Wen-xin2;  PENG　Kai-ming1
（1. State Key Laboratory of Pollution Control and Resource Reuse， Key Laboratory of Yangtze River Water Environment， Ministry of Education， College of Environmental Science and Engineering， Tongji University， Shanghai 200092， China； 2. Jiangsu Lüsaige Regenerated Co. Ltd.， Changzhou 213000， China）
Keywords:
waste emulsion;  oil water separation;  classified treatment;  biological denitrification
Abstract:
Mechanical processing waste emulsions contain diverse pollutants with high concentrations and significant fluctuations, posing significant challenges to the stable and efficient operation of traditional single treatment process. This study, based on a technical transformation project for centralized waste emulsion treatment, developed a combined physicochemical and biochemical treatment process tailored for mechanical processing waste emulsions. The study focused on exploring the impact of pollutant load on biological nitrification. In the physicochemical treatment stage, practices such as evaporation, magnetic demulsification and separation, coagulation, and air flotation were implemented to classify and treat emulsions. These methods significantly enhanced the process’s versatility for handling various waste emulsions. While the removal rates of TN and NH3-N were below 60%, the average removal rates of COD, oil, SS, and TP exceeded 90%. In the biochemical treatment stage, operational and debugging processes revealed that influent COD and NH3-N concentrations fluctuated between 2 885-5 100 mg/L and 60-170 mg/L, respectively. These fluctuations significantly affected the stability of biological denitrification. The NH3-N concentration in biochemical effluent was positively correlated with the influent COD and NH3-N volumetric loads. Critical influent COD and NH3-N volumetric loads for stable biological nitrification were identified as 1.13 kg/(m3·d) and 0.034 kg/(m?·d), respectively. Overall, the comprehensive treatment cost of the technical transformation project was significantly reduced compared to the previous process. The engineering practices and operational load control studies provide valuable insights and operational parameters for the efficient and stable treatment of waste emulsions.
Last Update: 2025-03-17