Jin Wen-Biao, Wang Jian-Fang, Zhao Qing-Liang, Lin Ji-Kan
Graduate School of Shenzhen, Harbin Institute of Technology, Shenzhen 518055, China.
Huan Jing Ke Xue. 2008 Mar;29(3):726-32.
The possible factors of sludge reduction such as sludge decay, energy uncoupled metabolism, anaerobic oxidation with low sludge production were discussed in an OSA (oxic-settling-anaerobic) process. It has been confirmed that sludge decay included hydrolysis and acidogenesis of dead microorganism and particle organic carbon adsorbed in sludge flocs and endogenous metabolism. The concentrations of SCOD, NH4(+)-N, TP in supernatant were increased gradually during sludge anaerobic treatment in the batch experiments. Soluble protein were increased up to 33.09 mg/L, exceeding carbohydrate change after 16 h anaerobic sludge treatment in the OSA batch experiment. It proved sludge lysis and hydrolysis in the OSA process. Endogenous SOUR in the OSA batch test was achieved 8 mg/(g h), more than 1.7 multiples as that in the CAS batch test. Higher endogenous metabolism promoted sludge reduction in the OSA process. Sludge decay is the decisive cause in OSA process, accounting for 66.7% of sludge production reduction. By batch experiments, it has been validated energetic uncoupling in OSA system since microorganisms were exposed in alternative anaerobic and aerobic environment. It accounts for about 7.5% of sludge production reduction. SCOD released from anaerobic sludge tank in the OSA process is used as the substrate for cryptic growth. The substrate is used for anoxic denitrifying, anaerobic phosphorus release, sulfate reduction and methane production. These anaerobic reactors have lower sludge production than aerobic oxidation when consumed SCOD is equivalent, which may lead to approximately 23.5% reduction of sludge production in the OSA system. It has been concluded that multiple causes result in minimization of excess sludge in OSA system.
在一个OSA（好氧-沉淀-厌氧）工艺中，讨论了污泥减量的可能因素，如污泥衰减、能量解偶联代谢、低污泥产量的厌氧氧化。已证实污泥衰减包括死亡微生物和吸附在污泥絮体中的颗粒有机碳的水解和产酸以及内源代谢。在批次实验中，污泥厌氧处理期间上清液中SCOD、NH4(+)-N、TP的浓度逐渐增加。在OSA批次实验中，厌氧污泥处理16小时后，可溶性蛋白质增加至33.09mg/L，超过了碳水化合物的变化。这证明了OSA工艺中污泥的溶解和水解。OSA批次试验中的内源比耗氧速率达到8mg/(g h)，是CAS批次试验中的1.7倍多。较高的内源代谢促进了OSA工艺中的污泥减量。污泥衰减是OSA工艺中的决定性原因，占污泥产量减少的66.7%。通过批次实验，已验证了OSA系统中的能量解偶联，因为微生物暴露在交替的厌氧和好氧环境中。它约占污泥产量减少的7.5%。OSA工艺中厌氧污泥罐释放的SCOD用作隐蔽生长的底物。该底物用于缺氧反硝化、厌氧释磷、硫酸盐还原和甲烷生成。当消耗的SCOD相等时，这些厌氧反应器的污泥产量比好氧氧化低，这可能导致OSA系统中的污泥产量减少约23.5%。得出的结论是，多种原因导致OSA系统中剩余污泥的最小化。
