ZHANGYi-dan,XUHao-long,BAIJun-yue,et al.Pilot Testing of Key Technologies for Upgrading of a Wastewater Treatment Plant in a Printing and Dyeing Industrial Park[J].China Water & Wastewater,2024,40(21):116-120.
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Pilot Testing of Key Technologies for Upgrading of a Wastewater Treatment Plant in a Printing and Dyeing Industrial Park

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第40卷 Number: 第21期 Page: 116-120 Column: Date of publication: 2024-11-01
Author(s):
ZHANG　Yi-dan1; 2; 3;  XU　Hao-long1; 2; 3;  BAI　Jun-yue1; 2; 3;  WANG　Chang-zhi1; 2; 3
（1. Eco-Environmental Science Research & Design Institute of Zhejiang Province， Hangzhou 310007， China； 2. State Environmental Protection Engineering Center for Water Pollution Control， Hangzhou 310007， China； 3. Key Laboratory of Environmental Pollution Control Technology of Zhejiang Province， Hangzhou 310007， China）
Keywords:
printing and dyeing industrial park;  wastewater treatment plant;  intermittent expansion hydrolysis tank;  new decolorization coagulant
Abstract:
The treatment capacity of a wastewater treatment plant in a printing and dyeing industrial park in the Qiantang River basin is 30×104 m3/d. The wastewater exhibits characteristics such as large flow rate, significant fluctuations in water quality, a substantial proportion of industrial wastewater, a low biochemical oxygen demand to chemical oxygen demand (B/C) ratio, and challenges in treatment. A combined process involving intermittent expansion hydrolysis, aerobic treatment and decolorization and coagulation was implemented for its treatment, yielding optimal results. Under the influent conditions of COD at 1 084.2 mg/L, chroma at 173 times, total phosphorus (TP) at 10.20 mg/L, and ammonia nitrogen (NH3-N) at 38.98 mg/L, the effluent COD, chroma, TP and NH3-N was 95.3 mg/L, 14.5 times, 0.44 mg/L and 11.52 mg/L, respectively, complying with the class Ⅰ limit specified in Integrated Wastewater Discharge Standard (GB 8978-1996). The COD removal efficiency of the intermittent expansion hydrolysis tank reached 27.9%, while the B/C ratio increased by 11.2%, indicating a significant enhancement in biodegradability. It could serve as a substitute for the primary sedimentation tank, achieving equivalent COD removal efficiency while exhibiting characteristics of reduced residence time and minimal sludge production. The resulting sludge volume was approximately 80.7% of that produced by the existing system. The decolorization efficiency of the new decolorization coagulant was 79.6%, while its COD removal efficiency was 41.0%. This new coagulant demonstrated superior performance in both chroma and COD reduction compared to traditional coagulants.
Last Update: 2024-11-01