| 好氧-沉淀-厌氧工艺剩余污泥减量性能和机理研究 |
| 摘要点击 2098 全文点击 1111 投稿时间：2007-03-26 修订日期：2007-05-08 |
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| 中文关键词 污泥减量 污泥衰减 能量解偶联 低污泥产率厌氧反应 |
| 英文关键词 sludge minimization sludge decay uncoupled metabolism anaerobic oxidation with low sludge production |
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| 中文摘要 |
| 探讨了污泥衰减、能量解偶联、低污泥产率厌氧反应对OSA工艺污泥减量作用的影响.结果表明，污泥衰减是由微生物死亡及吸附于污泥表面的颗粒有机物水解酸化和微生物内源代谢2部分组成.间歇试验污泥厌氧过程中，上清液SCOD、NH+4-N、TP浓度均随厌氧时间逐渐升高，OSA污泥厌氧16 h后溶解性蛋白质高达33.09 mg/L，上升幅度高于多糖浓度的变化，证实了污泥水解现象.OSA污泥内源SOUR可达8 mg/(g·h)，是CAS污泥内源SOUR的1.7倍以上，说明OSA系统中较高的内源代谢促使污泥减量.污泥衰减是OSA工艺污泥减量的决定性原因，可占OSA污泥减量效果的66.7%左右.间歇实验证实了OSA系统由于厌氧-好氧耦合环境，存在能量解偶联现象，但由于这种作用引发的污泥减量仅占7.5%左右.OSA工艺污泥厌氧池释放的SCOD作为缺氧反硝化、厌氧释磷、硫酸盐还原及产甲烷的二次基质，由于这些厌氧反应污泥产率低于好氧代谢，使得系统污泥产率下降，约有23.5%的污泥减量是源于这种因素.OSA污泥减量是由多方面因素综合作用的结果. |
| 英文摘要 |
| 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，NH+4-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. |
