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对环境的影响并实现“零排放”技术，拥有能够最大限度地矿化废水中有机质并最大限度地减少过量污泥产生的废水处理系统非常重要。为此，开发了带有污泥消化流的活性污泥工艺，其中部分回流污泥在返回曝气池之前被消化和溶解。这是一个很有前途的过程，但为了系统的实际使用目的，有必要解决系统中无机组分的积累问题并确认系统的长期稳定性。在本研究中，在实验室中对城市废水进行了采用臭氧化回流污泥消化的活性污泥工艺，并对不同无机化合物的物质和平衡进行了研究。该研究的具体目标是通过ICP分析监测进入系统的无机物的行为并阐明其行为的机制。实验结果表明： 1）Na等金属并未在系统中富集，而是以可溶形式随废水排出。 2) 一些金属，如铁和铝，在污泥中积累，但一段时间后，积累似乎达到饱和，3) 一些金属，如锌和铜，在整个实验期间继续在污泥中积累。在这些金属中，Fe表现出一个有趣的行为：当Fe积累达到饱和后，出水可溶性Fe浓度增加，表明存在Fe再溶解机制。需要进一步研究Fe再溶解的化学机制。