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Development of the highly advanced biological wastewater treatment process with intermittent direct ozonation

开发高度先进的间歇式直接臭氧生物废水处理工艺

基本信息

批准号：
20560505
负责人：
NISHIMURA Fumitake
金额：
$ 3万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2008
资助国家：
日本
起止时间：
2008 至 2010
项目状态：
已结题

项目摘要

Aiming excess sludge reduction, phosphorus recovery, and trace hazardous chemicals, "the highly advanced biological wastewater treatment process with intermittent direct ozonation" was developed and it was reported that the process is practical. However, there exist micropollutants such as estrogenic compounds in sewage, and required to be removed in sewage treatment plants. In this study, some elements such as Al, Cr, Mn, Fe, Cu, and Znare removed by wasting sludge, whereas Mg, K, Ca, Ni, and Ba were not accumulated in the system. Removal characteristics of estrogenic compounds (E1, E2, E3, EE2, NP, BPA) in the process was investigated by conductiong lab-scale experiments and simulating by the steady-state model. In sludge ozonation process, estrogenic compounds were rapidly removed both in water phase and in sludge phase at less than 30mgO3/gSS and adsorption characteristics did not change during sludge ozonation. In phosphorus recovery process, it was revealed that the concentration of estrogenic compounds did not change under the condition of pH from 8 to 10 and molar ratio ranging Ca/P 2.5 to 4. It was simulated by the steady-state model that removal ratio of estrogenic compounds was improved by 1.7-3 times compared with conventional activated sludge treatment at the operational condition of solubilization ratio of 0.1 and excess sludge wasting ratio of 0.0017.

针对剩余污泥减量、磷回收和微量有害化学品等问题，开发了“间歇式直接臭氧氧化高级生物污水处理工艺”，并报道了该工艺的实用性。然而，污水中存在微量污染物，如雌激素类化合物，需要污水处理厂去除。在本研究中，一些元素，如铝，铬，锰，铁，铜，锌被去除的废弃污泥，而镁，钾，钙，镍，钡在系统中没有积累。通过实验室实验和稳态模型模拟，研究了该工艺中雌激素化合物（E1、E2、E3、EE 2、NP、BPA）的去除特性。在污泥臭氧氧化过程中，雌激素类化合物在水相和污泥相中的去除率均在30 mgO 3/gSS以下，且污泥臭氧氧化过程中的吸附特性基本不变。在磷回收过程中，发现在pH为8 - 10和Ca/P摩尔比为2.5 - 4的条件下，雌激素化合物的浓度没有变化。稳态模型模拟表明，在增溶比为0.1、剩余污泥废弃率为0.0017的运行条件下，与常规活性污泥法相比，雌激素类化合物的去除率提高了1.7 ~ 3倍。