摘要
采用MBBR对某污水厂扩容2×10~4m^3/d,改造后污水处理规模达到12×10~4m^3/d;改造时,保持厌缺氧区不变,好氧区采用两级MBBR、微动力混合池型,强化系统抗冲击能力;好氧区投加SPR-3型填料;同时将二沉池改建为高效沉淀池,新增转鼓过滤。改造后水量提升20%,出水水质稳定达到一级A标准,优化运行后可达到地表水准Ⅳ类水质;生化池出水TN均值为10. 40 mg/L,TN去除率为83. 50%,好氧段可去除TN 6～10 mg/L;生化池出水TP为0. 43 mg/L,TP去除率为93%,缺氧段发生显著的TP去除现象,在高效沉淀池投加铁盐絮凝剂后,出水TP可降到0. 30 mg/L以下;系统内同步硝化反硝化(SND)及反硝化除磷菌(DPB)的出现,实现了碳源限制下的同步强化脱氮除磷,未投加碳源情况下TN和TP稳定达标,通过SND途径去除TN贡献率为13. 20%,通过DPB途径去除TP贡献率为88%,实现了节能降耗。
A WWTP was scaled up to 120 000 m3/d by MBBR, increasing capacity of 20 000 m^3/d in situ. The anoxic and aerobic zones was kept unchanged. Two stage MBBR with micro-power mixing tank and SPR - 3 carrier was used in aerobic zone to enhance impact resistance ability. Secondary sedimentation was upgraded to high density sedimentation tank and rotary filter was added at the same time. After retrofitting, water quality increased 20% and the effluent stably achieved the first level A criteria in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant ( GB 18918 一 2002 ), and even level quasi Ⅳ in Environmental Quality Standard for Surface Water ( GB 3838 - 2002 ) after optimized operation. Effluent TN of biological tank was 10. 40 mg/L by average and TN removal efificiency was 83. 50%. About 6-10 mg/L of TN was mainly removed in aerobic zone. Effluent TP of biological tank was 0. 43 mg/L by average and TP removal efficiency was 93% which mainly occurred in anoxic zone. After adding iron salt flocculants in high density sedimentation tank, effluent TP of WWTP dropped to less than 0. 30 mg/L. The presence of SND and DPB in the system enabled simultaneous enhanced nitrogen and phosphorus removal under carb on source constraints, and stable TN and TP compliance when carbon sources were not added. TN removal rate through SND pathway accounted for 13. 20% and TP removal rate through DPB pathway accounted for 88%, achieving energy saving and consumption reduction.
作者
路晖
辛涛
吴迪
张晶晶
LU Hui;XIN Tao;WU Di;ZHANG Jing-jing(Qingdao Spring Water Treatment Co. Ltd., Qingdao 266500, China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2019年第4期100-105,共6页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2017ZX07106005-04)
青岛市民生科技计划项目(18-6-1-100-nsh)
作者简介
路晖(1989-),男,山东淄博人,硕士,工程师,主要从事MBBR工艺设计与调试运行工作。E-mail: qingdaospr@163.com;通信作者:吴迪,E-mail:hitwudi@126.com.
