Development of dymanic model for growth of nitrifiers and phosphorus removing bacteria in sequencing batch reators

序批反应器中硝化细菌和除磷细菌生长动力模型的建立

基本信息

批准号：
07555169
负责人：
FURUMAI Hiroaki
金额：
$ 3.14万
依托单位：
Ibaraki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

The purpose of this study is to develop a non-steady state model which can express nutrient removal in sequencing batch reactors. The model was initially developed based on the IAWQ Activated Sludge Model No.2 (ASM2). A long-term experimental work was also carried out with a sequencing batch reactor (SBR) under anaerobic and aerobic condition. The reactor with an effective volume of 100 L was operated for three months. The cycle time of 6 hours was divided into four phases, which were the first mixing phase (2.0hrs) with feed of synthetic wastewater at a constant rate, the aeration and mixing phase (3.0hrs), the settling phase (0.5hrs) and discharge phase (0.5hrs). In the experiment, SRT and the DO level of aeration phase was controlled at around 20 days and 2.5mg/l, respectively. Experimental data at steady state and transient phase were utilized for the model calibration. Several kinetic parameter values were calibrated to explain the effluent quality at the steady state. The calibration works revealed that effluent P were very sensitive to kinetic parameters related to hydrolysis and fermentation processes and storage processes of PHA and poly-P by phosphorus accumulation organisms (PAO). Then a long-term simulation was conducted with the calibrated model to investigate phosphorus behavior during the start-up period. The model explained the nitrification/denitrifcation and biological P-removal processes satisfactorily. A better prediction was attaind when the denitrification ability by PAO was introduced, which was not considered in the ASM2. The quinon profile analysis was also conducted for activated sludge during a start-up period. Good correlationship between several quinon species and phosphrus removal activity. However it was difficult to identify the specific species for phosphorus removal activity.

本研究的目的是开发一种非稳态模型，可以表达序批式反应器中营养物的去除情况。该模型最初是基于 IAWQ 活性污泥模型 No.2 (ASM2) 开发的。还利用序批式反应器（SBR）在厌氧和好氧条件下进行了长期的实验工作。有效容积为100L的反应器运行了三个月。 6小时的循环时间分为四个阶段，即以恒定速率供给合成废水的第一混合阶段（2.0小时）、曝气和混合阶段（3.0小时）、沉降阶段（0.5小时）和放电阶段（0.5小时）。实验中，曝气阶段SRT和DO水平分别控制在20天左右和2.5mg/l。利用稳态和瞬态阶段的实验数据进行模型校准。校准了几个动力学参数值以解释稳态下的流出物质量。校准工作表明，废水中的 P 对与聚磷生物 (PAO) 水解、发酵过程以及 PHA 和聚磷储存过程相关的动力学参数非常敏感。然后使用校准模型进行长期模拟，以研究启动期间磷的行为。该模型令人满意地解释了硝化/反硝化和生物除磷过程。当引入PAO的反硝化能力时，获得了更好的预测，这是ASM2中没有考虑的。还在启动期间对活性污泥进行了醌谱分析。几种醌类物质与除磷活性之间具有良好的相关性。然而，很难确定具有除磷活性的具体物种。