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

以减少多余污泥、回收磷和痕量有害化学物质为目标，开发了“间歇式直接臭氧氧化高先进生物废水处理工艺”，并报道了该工艺的实用性。然而，污水中存在雌激素类化合物等微污染物，需要在污水处理厂进行去除。在本研究中，一些元素如Al、Cr、Mn、Fe、Cu和zna被废污泥去除，而Mg、K、Ca、Ni和Ba没有在系统中积累。通过实验室规模实验和稳态模型模拟，研究了该工艺对雌激素化合物（E1、E2、E3、EE2、NP、BPA）的去除特性。在污泥臭氧化过程中，在低于30mgO3/gSS的条件下，水相和污泥相均能快速去除雌激素化合物，并且在污泥臭氧化过程中，其吸附特性没有发生变化。在磷回收过程中，发现在pH为8 ~ 10，Ca/ p2.5 ~ 4的摩尔比范围内，雌激素化合物的浓度没有变化。通过稳态模型模拟，在增溶比为0.1、剩余污泥浪费比为0.0017的运行条件下，与常规活性污泥处理相比，雌激素化合物的去除率提高了1.7 ~ 3倍。

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.