YANGPing,XUKang-kang,ZHOUJia-zhong,et al.Application of MBBR and Magnetic Coagulation Process in Upgrading and Expansion of a WWTP with A2/O Microporous Aeration Oxidation Ditch[J].China Water & Wastewater,2023,39(10):67-74.
Click Copy

Application of MBBR and Magnetic Coagulation Process in Upgrading and Expansion of a WWTP with A2/O Microporous Aeration Oxidation Ditch

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第10期 Page: 67-74 Column: Date of publication: 2023-05-17
Author(s):
YANG　Ping1;  XU　Kang-kang2; 3;  ZHOU　Jia-zhong2; 3;  YANG　Zhong-qi2; 3;  HAN　Wen-jie2; 3;  WU　Di2; 3;  HUANG　Qing1;  ZHONG　Chen4
（1. Qingdao Shouchuang Ruihai Water Co. Ltd.， Qingdao 266042， China； 2. Qingdao SPRING Water Treatment Co. Ltd.， Qingdao 266510， China； 3. Qingdao Key Laboratory of Green and Low Carbon Biofilm and Water Environment Restoration， Qingdao SPRING Water Treatment Co. Ltd.， Qingdao 266510， China； 4. Gezhouba Group Eco-Environmental Protection Co. Ltd.， Wuhan 430030， China）
Keywords:
upgrading and expansion;  MBBR;  magnetic coagulation sedimentation tank
Abstract:
The treatment process of a wastewater treatment plant (WWTP) in Guangdong Province was A2/O microporous aeration oxidation ditch, which requires treatment capacity expansion and discharge standard upgrading at the same time. The treatment scale is increased from 10×104 m3/d to 15×104 m3/d (the expansion ratio is 50%), and the effluent quality needs to meet the stricter of the first level limit in the second period specified in the Guangdong local standard Discharge Limits of Water Pollutants (DB 44/26-2001) and first level A limit specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). To solve the problems of large expansion capacity, less available land area and strict discharge standards of the upgrading project, the technical route of MBBR to in-situ enhance the biochemical treatment, secondary sedimentation tank to increase the hydraulic loading rate and new magnetic coagulation sedimentation to ensure the solid-liquid separation was finally selected. The newly-built MBBR in biochemical section stably reduced the NH3-N and TN in effluent to (1.28±0.91) mg/L and (5.78±1.33) mg/L, respectively. Although the SS in effluent increased slightly with the increase of the surface loading rate of secondary sedimentation tank after the upgrading, the higher solid flux tolerance of magnetic coagulation ensured that the SS stably decreased from (17.45±4.18) mg/L to (3.59±0.71) mg/L and the TP in effluent reached (0.09±0.09) mg/L. The technical route of MBBR and magnetic coagulation sedimentation has good nitrogen and phosphorus removal performance, less footprint area occupation and strong impact resistance, which is suitable for the construction or expansion and upgrading of WWTP. If the expansion capacity of WWTP is further increased, the more intensive and efficient technical route of pure membrane MBBR and magnetic coagulation sedimentation should be adopted.
Last Update: 2023-05-17