HE Wei,HE Chao.Application of Combined Biofilter in Sewage Treatment Plant Upgraded to Quasi-Ⅳ Class Surface Water Standards[J].China Water & Wastewater,2021,37(8 8):74-77.
Application of Combined Biofilter in Sewage Treatment Plant Upgraded to Quasi-Ⅳ Class Surface Water Standards
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
8 8
Page:
74-77
Column:
Date of publication:
2021-04-17
- Keywords:
- municipal sewage treatment plant; quasi-Ⅳ class surface water standard; upgrading and reconstruction; biological aerated filter（BAF）
- Abstract:
- In order to meet the high assessment standard of effluent (TN fails to reach the standard no more than 3 times per year)， a combined biological filter (DN+C/N) and V-type filter (pre micro flocculation) advanced process was added on the basis of original improved A/A/O+highefficiency coagulation sedimentation tank+disc filter process in the upgrading project of a sewage treatment plant in Taizhou. The technology is expected to improve the effluent quality from first grade A standard to the Ⅳ class standard of Environmental Quality Standards for Surface Water (GB 3838-2002)(except for ammonia nitrogen, total nitrogen）. The project operation results showed that when the average values of COD, BOD5, SS, NH3-N, TN and TP of raw water were 133.5, 47.2, 75.3, 21.4, 30.9 and 2.59 mg/L, the average values of effluent were 11.6, 1.3, 2.0, 0.21, 9.2 and 0.12 mg/L, respectively. During the operation, attention should be paid to carbon source consumption and anoxic environment damage caused by water falling aeration, and ensure the supply of appropriate carbon source (50 mg/L) and the control of dissolved oxygen in denitrification tank (less than 1 mg/L).
Last Update:
2021-04-17