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 15):78-85.
Efficiency Analysis of MBBR Process Applied in Upgradation of a Wastewater Treatment Plant in Tangshan
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
15 15
Page:
78-85
Column:
Date of publication:
2020-08-01
- Keywords:
- MBBR; first class A standard; aerobic suspended carrier; anoxic suspended carrier; shock resistance
- 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.
Last Update:
2020-08-01