水解酸化-UASB-低压射流曝气工艺处理废纸制浆造纸废水

采用水解酸化-UASB-低压射流曝气工艺处理废纸制浆废水,对整个工艺及调试运行过程进行详细介绍并对遇到的问题进行分析。实际运行结果表明,该工艺设计合理,运行稳定可靠,总排放口出水COD≤90mg·L-1、SS≤50mg·L-1、BOD5≤20mg·L-1,出水水质可达到《造纸工业水污染排放标准》(GB3544-2008)的要求。     

改进型上流式反应器及其三相分离器的模糊优化设计

本文在 R R VAN DER MEER等人提出的上流式反应器废水厌氧处理的数学描述基础上,建立了一种改进结构的UASB反应器有机质转化率及工艺操作条件与反应器结构尺寸之间的稳态关系,根据反应器结构模糊优化模型求解。在此基础上对其三相分离器进行优化设计,取得了较好的效果。应用该模型可以求出反应器及三相分离器的最佳结构尺寸及有关的工艺操作条件,从而为厌氧反应器及三相分离器的优化设计提供一套完整、有效的方法,同时为过程的运行提供一定的依据。     

氨氮吹脱/UASB/生物接触氧化处理生活垃圾渗滤液

针对城市生活垃圾渗滤液CODCr浓度高、可生化性差、NH3-N含量高等特点,采用氨氮吹脱/UASB/生物接触氧化处理工艺对垃圾渗滤液进行处理.处理结果表明,本工艺对CODCr和NH3-N有较好的去除效果,去除率分别为76%和90%.     

高浓度化纤废水的处理及回用

高浓度化纤废水处理难度大、费用高，采用UASB厌氧处理，可将难降解的大分子有机物分解为小分子有机物，再通过多级接触氧化和生物炭池处理，出水COD浓度〈50mg／L（对COD的去除率高达99％），达到《污水综合排放标准》（GB8978-1996）一级标准。工程实践表明，UASB的实际容积负荷超过设计值，而多级串联接触氧化池中各级微生物的数量及形态保持相对独立，表现出类似于AB工艺的特征，具有处理效果好、运行稳定、投资少等优点。     

UASB/生物接触氧化工艺处理豆制品废水

介绍了＂王致和＂北京延庆生产基地生产废水的水质特点、处理工艺及技术参数.常温下采用UASB反应器/生物接触氧化工艺处理豆制品废水的运行情况表明,该工艺处理效果稳定可靠,产生的沼气和分离的盐可回收利用,获得了较好的经济效益和环境效益.     

Biochemical effects of administering shock loads of sucrose to a laboratory-scale anaerobic (UASB) effluent treatment plant

An experimental study was undertaken to determine the effects of administering shock loads of sucrose to a laboratory-scale anaerobic effluent treatment plant (UASB reactor) treating diluted landfill leachate. Administration of shock loads of 10 g l⁻ sucrose caused accumulations of up to 7 g l⁻¹ of l-lactate and the resultant acidity caused the pH value of the reactor effluent to drop from 7.2 to 4.7 which inhibited methanogenesis.Major disturbances in the composition of the biogas also occurred and, under the severest conditions, the biogas contained up to 30% (v/v) hydrogen.     

UASB/曝气觉淀、IC反应器处理高浓度硫盐有机废水

在赤霉素生产过程中产生的高浓度硫酸盐有机废水,处理难度较大.采用UASB/曝气沉淀/IC反应器工艺处理该废水,UASB中的硫酸盐还原菌将硫酸根还原为硫化物,曝气池中的脱硫杆菌则将硫化物氧化为单质硫,并在沉淀池中去除,IC反应器去除COD.系统稳定运行后,对硫酸盐的去除率>90%,对COD的去除率>80%.     

应用多种CDM方法学分析高浓度有机废水处理项目

按照联合国EB通过的清洁发展机制(CDM)方法学的规定,减排量≤6×104tCO2e/a的CDM项目可采用小型项目方法学.介绍了小型CDM项目方法学AMS.Ⅲ.H(第八版)、AMS.Ⅲ.I(第六版)以及AMS.Ⅰ.C(第十二版)的适用条件,其中任何一种单一方法学均无法完全适用于以UASB 接触氧化法工艺替代原厌氧稳定塘处理工艺、以收集的沼气替代锅炉燃煤的高浓度有机废水处理项目.为此,同时采用以上3种方法学对某项目进行分析,从而解决了方法学适用条件与实际情况有出入的问题,为国内此类项目申请CDM项目提供了一个范例.     

Anaerobic sewage treatment in a one-stage UASB reactor and a combined UASB-Digester system

The treatment of sewage at 15 degrees C was investigated in a one-stage upflow anaerobic sludge blanket (UASB) reactor and a UASB-Digester system. The latter consists of a UASB reactor complemented with a digester for mutual sewage treatment and sludge stabilisation. The UASB reactor was operated at a hydraulic retention time of 6h and a controlled temperature of 15 degrees C, the average sewage temperature during wintertime of some Middle East countries. The digester was operated at 35 degrees C. The UASB-Digester system provided significantly (significance level 5%) higher COD removal efficiencies than the one-stage UASB reactor. The achieved removal efficiencies in the UASB-Digester system and the one-stage UASB reactor for total, suspended, colloidal and dissolved COD were 66%, 87%, 44% and 30%, and 44%, 73%, 3% and 5% for both systems, respectively. The stability values of the wasted sludge from the one-stage UASB reactor and the UASB-Digester system were, respectively, 0.47 and 0.36g CH(4)-COD/g COD. Therefore, the anaerobic sewage treatment at low temperature in a UASB-Digester system is promising.     

Characteristics of sludge developed under different loading conditions during UASB reactor start-up and granulation

Sludge characteristics available inside the reactor are of vital importance to maximize advantages of UASB reactor. The organic loading rate and sludge loading rate applied during start-up are among the important parameters to govern the sludge characteristics. Effects of these loading rates on the characteristics of the sludge developed are evaluated in six laboratory scale UASB reactors. The sludge characteristics considered are VSS/SS ratio of the sludge, sludge volume index, specific gravity, settling velocity and metal contents of the sludge developed under different loading rates. The experimental results indicate that, for developing good characteristics sludge, during primary start-up from flocculent inoculum sludge, organic loading rate and sludge loading rate should be in the range of 2.0-4.5 kg COD/m3 d and 0.1-0.25 kg COD/kg VSS d, respectively (chemical oxygen demand, COD). Proper sludge granulation and higher COD removal efficiency will be achieved by these loading rates.