LIU Yan,TENG-Yi-jie,ZHOU-Jizhong,et al.Operation Effect of Pure MBBR Process Used in a Large-scale Water Purification Plant in South China[J].China Water & Wastewater,2022,38(2022 1 1):1-8.
Operation Effect of Pure MBBR Process Used in a Large-scale Water Purification Plant in South China
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
2022 1 1
Page:
1-8
Column:
Date of publication:
2022-01-01
- Keywords:
- micro-polluted river water; pure MBBR process; intermittent operation; gas-water ratio; ammonia nitrogen; SPSS analysis
- Abstract:
- The design treatment capacity of a large-scale water purification plant in South China is 260×104 m3/d, mainly for treatment of micro-polluted river water. In order to improve the nitrification capacity of the system, the end of the original horizontal flow sedimentation tank was modified by pure MBBR process. Three days after all the suspended carriers were added, the concentration of NH3-N in the effluent was less than 1.0 mg/L, which reached the design standard. During stable operation, the concentration of NH3-N in the effluent of the system was (0.19 ± 0.14) mg/L, and the average NH3-N removal rate was 91.64%, which stably reached the class Ⅱ criteria specified in the Environmental Quality Standards for Surface Water (GB 3838-2002). The pure MBBR system had a good intermittent operation capability. After the suspended carrier were dried out of water for 7 days, the pure MBBR system was restored to water. It only took 4 days to recover its removal performance of NH3-N. The effects of temperature, hydraulic load, influent NH3-N concentration, gas-water ratio on the NH3-N concentration of effluent were studied, and SPSS software was used for statistical analysis. The results showed that the factors affecting the effluent NH3-N concentration were temperature > influent NH3-N concentration>> hydraulic load and gas-water ratio. The effluent NH3-N concentration had negative and positive correlation with water temperature and influent NH3-N concentration respectively. Based on the excellent resistance to low temperature and water quality impact of the pure MBBR process and reasonable design parameters, it ensured that the effluent NH3-N concentration reached the design standards stably when the temperature was lower than 15 ℃ and the influent quality fluctuated greatly. The gas-water ratio had little effect on the effluent NH3-N concentration. Under the condition of gas?water ratio of 0.7-2.0, the fluidization of suspended carriers was good, and the average effluent NH3-N concentration was less than 0.5 mg/L. The hydraulic load had almost no effect on the effluent NH3-N concentration, and the system had good hydraulic shock resistance. After the reconstruction of pure MBBR process, the effluent COD, BOD5, TP and SS of the system were better than those of before transformation. The total operation cost of the project was 0.076-0.109 yuan/m3.
Last Update:
2022-01-01