LIFu-qin,ZHENGJiong-zhou,CHENYu-hang,et al.Resource Recovery Treatment for High-salinity and High COD Wastewater:A Project Case[J].China Water & Wastewater,2025,41(8):114-119.
高盐、高COD化工废水资源化处理工程实例
- Title:
- Resource Recovery Treatment for High-salinity and High COD Wastewater:A Project Case
- 关键词:
- 高盐、高COD化工废水; 超滤; 电渗析; UASB工艺; A/O工艺
- Keywords:
- high-salinity and high COD wastewater; ultrafiltration; electrodialysis; UASB process; A/O process
- 摘要:
- 针对高盐、高COD化工废水含盐量高、有机物含量高、水质复杂的特点，采用磁混凝沉淀+机械过滤+超滤+两级电渗析+（浓水）压汽蒸发（MVR）+（淡水）三级UASB+A/O组合工艺进行处理。介绍了废水处理工艺流程、主要构筑物的设计参数及设备配置，并对工程运行效果及投资运行成本进行了分析。实际结果表明，该工艺对高盐、高COD化工废水具有良好的处理效果。其中，电渗析淡水进水NaNO3为93 500 mg/L、COD为103 400 mg/L，出水NaNO3为1 430 mg/L、COD为95 800 mg/L；浓水进水为除盐水（RO产水），出水NaNO3为107 500 mg/L、COD为5 940 mg/L，达到了设计分盐效果；（淡水）三级UASB+A/O工艺进水COD为45 000 mg/L、TN为531 mg/L、TP为10 mg/L，出水COD、TN、TP分别降至297、47、4 mg/L，满足河南省《化工行业水污染物间接排放标准》（DB 41/1135—2016）和园区污水处理厂纳管标准。该工程总投资为2 089.17万元，运行成本为123.37元/m3。三级UASB产生的沼气用于厂区热水锅炉，MVR产出的NaNO3（约10 t/d）回收利用，达到废水资源化处理效果。
- Abstract:
- To address the challenges of high-salinity and high COD chemical industry wastewater, characterized by high salt content, high organic matter, and complex water quality, an integrated treatment process has been implemented. This process combines magnetic coagulation sedimentation, mechanical filtration,ultrafiltration, two-stage electrodialysis, mechanical vapor recompression(MVR)evaporation for concentrated water, and a three-stage UASB+A/O combination process for freshwater treatment. This paper details the process flow, design parameters of key structures, equipment configuration, and evaluates the operational effectiveness and costs of the project. Results indicate that the process effectively treats high-salinity and high COD wastewater. Specifically, electrodialysis freshwater influent contains 93 500 mg/L NaNO3 and 103 400 mg/L COD, with effluent concentrations reduced to 1 430 mg/L NaNO3 and 95 800 mg/L COD. For concentrated water, the influent is desalinated water (RO water), with effluent containing 107 500 mg/L NaNO3 and 5 940 mg/L COD, achieving the desired salt separation. The three-stage UASB+A/O process treats influent with COD of 45 000 mg/L, TN of 531 mg/L, and TP of 10 mg/L, reducing effluent concentrations to COD 297 mg/L, TN 47 mg/L, and TP 4 mg/L. These levels meet the Henan Province Indirect Discharge Standards of Water Pollutants for the Chemical Industry (DB 41/1135-2016) and the park’s wastewater treatment plant standards. The project’s total investment is 20.891 7 million yuan, with a per-ton operational cost of 123.37 yuan. The three-stage UASB generates biogas used for the plant’s hot water boiler, and approximately 10 tons of NaNO3 are recovered daily from the concentrated water MVR evaporation, demonstrating effective resource recovery and wastewater utilization.
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