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(3):1-6.
南方污水處理廠污泥厭氧發(fā)酵制取碳源及投加策略
- Title:
- Preparation of Carbon Source by Anaerobic Fermentation of Sludge in Wastewater Treatment Plant in Southern China and Its Dosing Strategy
- Keywords:
- excess sludge; anaerobic fermentation; carbon source; biological nitrogen removal; sludge reduction
- 摘要:
- 為應(yīng)對污水廠出水總氮標(biāo)準(zhǔn)日益提升的要求，提高生化池的反硝化能力，減少對外加碳源的依賴，考察了利用南方某污水處理廠的剩
余污泥厭氧發(fā)酵制取碳源的效能、影響因素和回用投加比例，分析了剩余污泥厭氧發(fā)酵制取碳源的可行性、污泥減量效果和經(jīng)濟效益。當(dāng)控制初始MLSS約為15 000 mg/L時，厭氧發(fā)酵的ORP基本在-400 mV左右，有利于碳源的制��；可采用按比例更換新污泥的方式進行厭氧發(fā)酵，換泥比例為每天50%左右，折合SRT約為48 h；以2.5%厭氧發(fā)酵污泥結(jié)合75 mg/L復(fù)合碳源投加到缺氧系統(tǒng)中，可增強脫氮能力，且發(fā)酵污泥的總氮、總磷和重金屬離子基本不會對生化系統(tǒng)造成不良影響。以折合SRT計算，厭氧發(fā)酵的污泥削減率約為7%；以10×104 m3/d的污水處理廠為例，采用厭氧發(fā)酵技術(shù)每年可節(jié)省運營成本約410.6 萬元。
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.
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