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.
MBBR+磁混凝用于A2/O微曝氧化沟污水厂提标扩容
- Title:
- Application of MBBR and Magnetic Coagulation Process in Upgrading and Expansion of a WWTP with A2/O Microporous Aeration Oxidation Ditch
- 摘要:
- 广东某污水厂处理工艺为A2/O微曝氧化沟，现要求同时扩容提标，处理规模由10×104 m3/d提升至15×104 m3/d，扩容50%，出水水质需满足广东省地方标准《水污染物排放限值》（DB 44/26—2001）第二时段一级标准及《城镇污水处理厂污染物排放标准》（GB 18918—2002）一级A标准中的较严者。针对改造工程扩容体量大、可用土地少及排放标准严的问题，最终选择“MBBR原位强化生化处理能力+二沉池提高负荷+新建磁混凝沉淀保障固液分离”技术路线。通过生化段镶嵌MBBR工艺，使出水NH3-N和TN分别稳定降至（1.28±0.91） mg/L和（5.78±1.33） mg/L；虽然改造后二沉池表面负荷提高致使出水SS略有升高，但磁混凝较高的固体通量承受能力，可确保SS由（17.45±4.18） mg/L稳定降至（3.59±0.71） mg/L，同时保障出水TP达到（0.09±0.09） mg/L。“MBBR+磁混凝沉淀”技术路线脱氮除磷效果好、占地省、抗冲击能力强，适用于污水厂的新建或扩容提标改造。如污水厂扩容量进一步提高，则需采用更加集约高效的“纯膜MBBR+磁混凝沉淀”技术路线。
- 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.
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