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.
南方污水处理厂污泥厌氧发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:
- 为应对污水厂出水总氮标准日益提升的要求，提高生化池的反硝化能力，减少对外加碳源的依赖，考察了利用南方某污水处理厂的剩余污泥厌氧发酵制取碳源的效能、影响因素和回用投加比例，分析了剩余污泥厌氧发酵制取碳源的可行性、污泥减量效果和经济效益。当控制初始MLSS约为15 000 mg/L时，厌氧发酵的ORP基本在-400 mV左右，有利于碳源的制取；可采用按比例更换新污泥的方式进行厌氧发酵，换泥比例为每天50%左右，折合SRT约为48 h；以2.5%厌氧发酵污泥结合75 mg/L复合碳源投加到缺氧系统中，可增强脱氮能力，且发酵污泥的总氮、总磷和重金属离子基本不会对生化系统造成不良影响。以折合SRT计算，厌氧发酵的污泥削减率约为7%；以10×104 m3/d的污水处理厂为例，采用厌氧发酵技术每年可节省运营成本约410.6 万元。
- 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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