一种用于创新生物脱氮工艺的膜生物反应器。

A membrane bioreactor for an innovative biological nitrogen removal process.

机构信息

Department of Civil Engineering, The University of Hong Kong, Hong Kong, China.

出版信息

Water Sci Technol. 2010;61(3):671-6. doi: 10.2166/wst.2010.886.

DOI:10.2166/wst.2010.886

PMID:20150703

Abstract

A hybrid system has been developed for biological nitrogen removal through nitrification-denitrification. The system includes an aerobic tank and an anoxic tank with an intermediate sludge settler connected to a membrane bioreactor (MBR) with a submerged 0.4 microm hollow-fiber membrane module. The laboratory system has a total working volume of 6.5 L treating a glucose-based synthetic wastewater. The experimental results demonstrate that the new process is highly effective for simultaneous organic and nitrogen removal. During the stationary operation, a sludge SS (suspended solids) concentration of 6 g/L or higher can be maintained in the reactors. The system has a COD (chemical oxygen demand) loading rate of up to 2,100 mg/L-d and a total nitrogen loading rate of up to 170 mg N/L-d. More than 95% COD can be degraded, and the total nitrogen removal efficiency can be 90% or higher as the nitrogen is reduced from 100 to around 7.5 mg/L. A high quality effluent is produced with a SS of less than 1 mg/L. With the MBR, organic degradation, nitrogen removal and sludge-liquid separation can be well achieved within a short HRT of about 10 hr.

摘要

已开发出一种通过硝化-反硝化进行生物脱氮的混合系统。该系统包括一个好氧池和一个缺氧池，中间有一个中间污泥沉降器连接到一个膜生物反应器（MBR），其中有一个浸没式 0.4 微米中空纤维膜组件。实验室系统的总工作体积为 6.5 L，处理基于葡萄糖的合成废水。实验结果表明，新工艺对同时去除有机氮非常有效。在稳定运行期间，反应器中可以维持 6 g/L 或更高的污泥 SS（悬浮固体）浓度。该系统的 COD（化学需氧量）负荷率高达 2100 mg/L-d，总氮负荷率高达 170 mg N/L-d。超过 95%的 COD 可以降解，总氮去除效率可以达到 90%或更高，因为氮从 100 减少到约 7.5 mg/L。产生的出水质量很高，SS 小于 1 mg/L。通过 MBR，可以在大约 10 小时的短 HRT 内很好地实现有机降解、脱氮和污泥-液体分离。