Material balance and microbial community of activated sludge process with excess sludge minimization stream

剩余污泥最小化流活性污泥法的物料平衡和微生物群落

• 批准号: 12450211
• 负责人: MINO Takashi
• 金额: $ 1.98万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450211/
• 关键词: activated sludge process; excess sludge; ozone treatment; zero emission; inorganic compounds; sludge solubilization; metal salts; ICP analysis; 微生物群集解析; DGGE

In order to reduce the environmental impact from wastewater treatment processes and to achieve "zero emission" technology, it is very important to have wastewater treatment systems that can maximize mineralization of organic mattes in the wastewater and to minimize the excess sludge production. For such a purpose, the activated sludge process with a sludge digestion stream has been developed, in which a part of the return sludge is digested and solubilized before returning to the aeration tank. This is a promising process, but it is necessary for the purpose of practical use of the system to solve the problem of the accumulation of inorganic components in the system and to confirm the long-term stability of the system. In the present study, an activated sludge process with a return sludge digestion by ozonation was operated in the laboratory with a municipal wastewater and the material, balance of different inorganic compounds was investigated. The specific objective of the study was to monitor the behavior of inorganic matters entering the system by using ICP analysis and to clarify the mechanism of their behaviors. The experimental results indicated that: 1) Some metals like Na did not accumulate in the system and go out in the effluent in the soluble form. 2) Some metals like Fe and Al accumulated in the sludge, but after some time the accumulation appeared to come to a saturation, and 3) Some metals like Zn and Cu continued to accumulate in the sludge throughout the experimental period. Among these metals, Fe showed an interesting behavior: after the accumulation of Fe came to saturation, the effluent soluble Fe concentration increased, indicating there is a mechanism of Fe re-solubilizatlon. It is needed to further investigate the chemical mechanism of this re solubilization of Fe.

为了减少废水处理过程的环境影响并获得“零排放”技术，具有废水处理系统非常重要，该系统可以最大程度地提高废水中有机哑光的矿化，并最大程度地减少污泥产生的多余。为此，已经开发出具有污泥消化流的活性污泥工艺，其中一部分返回污泥在返回到曝气罐之前被消化和溶解。这是一个有前途的过程，但是必须实际使用系统来解决系统中无机组件积累的问题并确认系统的长期稳定性。在本研究中，通过市政废水在实验室中运营了带有臭氧返回污泥消化的活性污泥工艺，并研究了不同无机化合物的材料。该研究的具体目的是通过使用ICP分析并阐明其行为机制来监测进入系统的无机事项的行为。实验结果表明：1）像Na这样的某些金属没有在系统中积聚，并以可溶性形式出水。 2）一些金属等在污泥中积累的金属，但是一段时间后，积累似乎饱和，3）在整个实验期间，Zn和Cu（例如Zn和Cu）等一些金属在污泥中继续积聚。在这些金属中，FE表现出一种有趣的行为：Fe的积累饱和后，流出的可溶性Fe浓度增加了，表明存在Fe Re-溶解的机制。需要进一步研究这种Fe的重新溶解的化学机制。