LUO Feng,PENG Jin?hu,ZHANG Zhong-xiang,et al.Preparation of Carbon Source by Anaerobic Fermentation of Sludge in Wastewater Treatment Plant in Southern China and Its Dosing Strategy[J].China Water & Wastewater,2022,38(No.3):1-6.
Preparation of Carbon Source by Anaerobic Fermentation of Sludge in Wastewater Treatment Plant in Southern China and Its Dosing Strategy
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
No.第3
Page:
1-6
Column:
Date of publication:
2022-02-01
- Keywords:
- excess sludge; anaerobic fermentation; carbon source; biological nitrogen removal; sludge reduction
- Abstract:
- In order to meet the increasing demand of the total nitrogen standard of effluent from wastewater treatment plant (WWTP), enhance the denitrification capacity of biochemical tank and reduce the dependence on the external carbon source, the influencing factors of carbon source preparation by anaerobic fermentation of excess sludge from a WWTP in Southern China and the ratio of reuse were investigated. The feasibility, sludge reduction and economic benefit were analyzed. When the initial MLSS was controlled at about 15 000 mg/L, the ORP was about -400 mV during anaerobic fermentation, which was beneficial to the preparation of carbon source. Anaerobic fermentation was carried out by replacing new sludge in proportion, and the replacement ratio was about 50% per day, in which sludge retention time was about 48 hours. 2.5% anaerobic fermentation sludge combined with 75 mg/L composite carbon source was added to the anoxic system to enhance the nitrogen removal capacity, and the total nitrogen, total phosphorus and heavy metal ions of sludge would not cause adverse effects on the biochemical system. Based on SRT, the sludge reduction rate of anaerobic fermentation was about 7%. Taking a WWTP with capacity of 10×104 m3/d as an example, the adoption of anaerobic fermentation technology could save operating cost about 4.106 million yuan each year.
Last Update:
2022-02-01