SUSan-bao,SHANGHong-chao,LIChun-hong,et al.Catalytic Ozonation/Biological Aerated Filter Combined Process for Advanced Treatment of Effluent from High Sour Gas Field[J].China Water & Wastewater,2023,39(17):106-112.
Catalytic Ozonation/Biological Aerated Filter Combined Process for Advanced Treatment of Effluent from High Sour Gas Field
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第17期
Page:
106-112
Column:
Date of publication:
2023-09-01
- Keywords:
- catalytic ozonation; biological aerated filter (BAF); high sour gas field; hypersaline wastewater; advanced treatment
- Abstract:
- This paper explored the variation in water quality by monitoring the key water quality indexes, investigated the characteristics of bacteria such as AOB and archaea such as AOA in biological aerated filter (BAF) by high-throughput sequencing and fluorescence quantitative PCR, so as to reveal the mechanism of a full-scale catalytic ozonation/BAF process for advanced treatment of hypersaline effluent from a gas filed. When the chloride ion concentration, COD and ammonia nitrogen in influent were 9 912 mg/L, 223 mg/L and 44.0 mg/L， respectively, the ozone dosage was in the range of 200-350 mg/L and the BAF aeration rate was between 150 m3/h and 300 m3/h, the COD removal rates of ozone catalytic oxidation and BAF were 49.3% and 15.8%, respectively, and the removal rates of ammonia nitrogen were 38.2% and 54.3%, respectively. The COD and ammonia nitrogen in effluent from BAF were 77.8 mg/L and 3.29 mg/L, respectively, which met the influent requirements of downstream process. All ammonia nitrogen was converted to nitrite nitrogen or nitrate nitrogen through nitrification, and there was no denitrification. The dominant bacteria were Rhodobacter, Sphingobium, Azoarcus, Rhodocyclus and Planktosalinus. The most dominant AOB genus was Nitrosomonas. The dominant AOA genera were Nitrososphaera and Nitrosocosmicus, both of which belong to phylum of Thaumarchaeota. The contents of bacteria, AOB and AOA were (0.63-1.33)×109 copies/g filler, (2.00-4.21)×108 copies/g filler and (4.14-9.84)×104 copies/g filler, respectively. The content of bacteria and AOB was abundant, while the content of AOA was low, indicating that bacteria and AOB played a major role in the degradation of organic contaminants and ammonia nitrogen.
Last Update:
2023-09-01