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.
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Resource Recovery Treatment for High-salinity and High COD Wastewater:A Project Case

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第41卷 Number: 第8期 Page: 114-119 Column: Date of publication: 2025-04-17
Author(s):
LI　Fu-qin1; 2; 3;  ZHENG　Jiong-zhou1;  CHEN　Yu-hang1;  WANG　Cong1;  DAI　Qi-bin4;  TIAN　Li4;  LI　Wei-xian5
（1. College of Energy and Environmental Engineering， Hebei University of Engineering， Handan 056038， China； 2. Hebei Provincial Technology Innovation Center for Water Pollution Control and Water Ecological Restoration， Handan 056038， China； 3. Hebei Provincial Engineering Research Center for Sewage Treatment and Resource Utilization， Handan 056038， China； 4. Jizhong Energy Fengfeng Group Co. Ltd.， Handan 056107， China； 5. Leache Chem Ltd.， Handan 057550， China）
Keywords:
high-salinity and high COD wastewater;  ultrafiltration;  electrodialysis;  UASB process;  A/O process
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.
Last Update: 2025-04-17