ZHANG Jing-jing,YANG Cui-chun,DING Peng-lin,et al.Efficiency Analysis of MBBR Process Applied in Upgradation of a Wastewater Treatment Plant in Tangshan[J].China Water & Wastewater,2020,36(15):78-85.
MBBR工艺用于唐山某污水厂提标改造效能分析
- Title:
- Efficiency Analysis of MBBR Process Applied in Upgradation of a Wastewater Treatment Plant in Tangshan
- Keywords:
- MBBR; first class A standard; aerobic suspended carrier; anoxic suspended carrier; shock resistance
- 摘要:
- 唐山某污水厂进行一级A提标改造，采用MBBR工艺对氧化沟进行改造，在缺氧区及好氧区同时投加悬浮载体。改造后系统出水COD、BOD5、TN、氨氮、TP、SS分别为(30.5±5.2)、(3.4±0.6)、(13.0±1.4)、(1.6±1.0)、(0.42±0.05)、(7.55±1.18) mg/L，稳定达到一级A标准。污水厂全流程测定结果显示，好氧区存在稳定的同步硝化反硝化(SND)过程，对TN的去除率为8.9%，保障在不投加碳源的情况下出水TN稳定达标。小试结果表明，在10~12 ℃的低温环境下，悬浮载体的硝化速率为0.13 kgN/(m3·d)，原水反硝化速率最大为0.039 kgN/(m3·d)，悬浮载体的加入保障了系统低温下良好的处理效果。高通量测序结果表明：好氧区悬浮载体上硝化螺旋菌相对丰度为6.57%，是活性污泥的3倍，并且在好氧区悬浮载体上发现了相对丰度为1.85%的反硝化菌，为SND现象提供了微观解释。缺氧区悬浮载体上反硝化菌的相对丰度为7.72%，是活性污泥中的2.5倍。通过原池嵌入MBBR工艺，强化了系统的硝化反硝化效果。
- Abstract:
- A wastewater treatment plant (WWTP) in Tangshan was upgraded to first class A standard. The oxidation ditch was reconstructed by MBBR process, in which suspended carriers were added to the anoxic and aerobic areas. The COD, BOD5, TN, NH+4-N, TP and SS in the effluent after reconstruction were (30.5±5.2), (3.4±0.6), (13.0±1.4), (1.6±1.0), (0.42±0.05) and (7.55±1.18) mg/L, respectively, which stably met the first class A standard. Water quality measurement along the biochemical tank showed that stable simultaneous nitrification and denitrification (SND) took place in the aerobic area. The removal efficiency of TN was 8.9%, and the effluent TN could stably reach the standard without adding carbon source. The smallscale experimental results showed that the nitrification rate and maximal denitrification rate of the suspended carrier were 0.13 kgN/(m3·d) and 0.039 kgN/(m3·d) respectively at low temperature environment (10-12 ℃). The results indicated that the addition of suspended carriers maintained the good treatment performance at low temperature. The relative abundance of Nitrospira on the aerobic suspended carriers was 6.57% as detected by highthroughput sequencing, which was three times of that in activated sludge. In addition, denitrifying bacteria with relative abundance of 1.85% was found on the aerobic suspended carriers, which explained the SND phenomenon from a microscopic point of view. The relative abundance of denitrifying bacteria on the suspended carrier in anoxic area was 7.72%, which was 2.5 times of that in activated sludge. Nitrification and denitrification efficiency of the system was enhanced by embedding MBBR process in the biochemical tank.
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