厌氧序批式反应器(ASBR)的六大优点

分析了厌氧序批式反应器（ASBR）的六大优点,与连续流厌氧反应器相比,ASBR构造简单、投资省,生物絮凝和固液分离效果好,水头损失小、动力费用低,生化反应推动力大,可形成以甲烷八叠球菌为优势茵的颗粒污泥,处理高浓度有机废水时对碱度的需求量少,运行费用低。     

VRF to VRF组网技术应用研究

随着我国市场经济的快速发展,越来越多的企业要求能够跨市、跨省甚至跨国的通信,因此,ISP需要提供有效的VPN跨域通信解决方案。以不同城市的城域网BGP MPLS VPN为基础,通过在ABSR上为VPN配置VRF的Import/Export Target,实现了VRF to VRF组网方式,并分析了VRF to VRF组网方式的优缺点。     

厌氧序批式反应器(ASBR)启动特性研究

以葡萄糖为进水基质，研究了厌氧序批式反应器（ASBR）的启动过程。实验表明：在中温条件下接种普通厌氧污泥，逐步增加反应器负荷，经过168d的运行，ASBR反应器的容积负荷由接种时的1．5kgCODCr／m^3／d提高到了设计值：5kgCODCr／m^3／d，产气率达到0．33m^3/kgCOD,COD的去除率达到97．5％，出水的VFA稳定在250mg／L左右，污泥的最大乙酸、丙酸和丁酸代谢活性有大幅增加，甲酸代谢活性有所降低。     

综合印染废水厌氧处理的工艺比较

绍兴污水处理厂为了进一步提高出水水质,最终达到一级排放标准,需对厌氧处理进行改造。对比了EGSB、ABR和ASBR三种工艺,中试表明,运行稳定后HRT为15～20h,CODCr去除率为10%～30%,单位处理成本可下降0.07元/m3左右。pH在8.5以内可提高厌氧处理效果。厌氧处理对TA去除效果不明显。SS、硫酸盐变化的趋势与CODCr削减趋势相一致,高浓度的硫酸盐会对厌氧消化过程产生不利影响。泥水分离效果好是保证反应器内有较高生物量的前提。ABR和ASBR将分别应用于一、二期工程厌氧处理的改造。     

Hydrogen production from alcohol wastewater with added fermentation residue by an anaerobic sequencing batch reactor (ASBR) under thermophilic operation

The objective of this study was to investigate the enhancement of hydrogen production from alcohol wastewater by adding fermentation residue using an anaerobic sequencing batch reactor (ASBR) under thermophillic operation (55 °C) and at a constant pH of 5.5. The digestibility of the added fermentation residue was also evaluated. For a first set of previous experiments, the ASBR system was operated to obtain an optimum COD loading rate of 50.6 kg/m³ d of alcohol wastewater without added fermentation residue and the produced gas contained 31% H₂ and 69% CO₂. In this experiment, the effect of added fermentation residue (100–1200 mg/l) on hydrogen production performance was investigated under a COD loading rate of 50.6 kg/m³ d of the alcohol wastewater. At a fermentation residue concentration of 1000 mg/l, the produced gas contained 40% H₂ and 60% CO₂ without methane and the system gave the highest hydrogen yield and specific hydrogen production rate of 128 ml/g COD removed and 2880 ml/l d, respectively. Under thermophilic operation with a high total COD loading rate (51.8 kg/m³ d) and a short HRT (21 h) at pH 5.5, the ASBR system could only break down cellulose (41.6%) and hemicellulose (21.8%), not decompose lignin.     

新型厌氧处理新工艺-ASBR法的研究

厌氧序批式活性污泥法(ASBR)是一种新型的高速厌氧反应器,它具有耐冲击负荷,适用范围广等特点。本文论述了ASBR的工艺特性、影响因素,介绍了其在中高浓度废水(如香料废水、食品加工废水等)和低浓度废水(如生活污水)中的应用,并展望了ASBR的应用前景。     

A／ASBR中PHB转化与反硝化吸磷的关系研究

通过COD浓度对A／ASBR反硝化除磷脱氮系统的影响试验表明，过高或过低的COD都不利于反硝化除磷系统的正常运行，当COD=220～300mg／l时，可以获得较为理想的处理效果。发现了缺氧段残存的外碳源有机物和厌氧储存的胞内碳源PHB对反硝化除磷过程的影响；试验结果进一步表明以PHB为碳源的反硝化除磷过程中，PHB的消耗与反硝化除磷脱氮具有良好的相关关系，并且2mgNO3^--N的转化可以促进1mg PO4^3--P的吸收。     

常温低基质厌氧氨氧化ASBR反应器的快速启动

采用低基质模拟废水〔NH_4~+-N、NO_2~--N分别为(25±0.4)、(33±0.6)mg/L〕,在温度为(23±0.5)℃的条件下,研究了厌氧氨氧化ASBR反应器的快速启动。第Ⅰ阶段HRT为24 h,pH不控制,菌体自溶期出水NH_4~+-N为69 mg/L,活性停滞期出水NH_4~+-N与进水几乎相等;第Ⅱ~Ⅲ阶段,菌体处于活性提高期,HRT分别为12、8 h,pH控制为8.0~8.2,出水NH_4~+-N降低到1.6 mg/L,NO_2~--N均先升高后降低;第Ⅳ阶段HRT为4 h,pH控制为8.0~8.2,出水NH_4~+-N和NO_2~--N均低于1 mg/L,TN去除负荷为352.3 mg/(L·d),△m(NH_4~+-N)∶△m(NO_2~--N)∶△m(NO_3~--N)=1∶(1.33±0.02)∶(0.26±0.02),反应器启动成功。     

The use of acidified palm oil mill effluent for thermophilic biomethane production by changing the hydraulic retention time in anaerobic sequencing batch reactor

The feasibility of thermophilic biomethane production from acidified palm oil mill effluent (POME) was assessed in a 5 L anaerobic sequencing batch reactor (ASBR). The effects of various hydraulic retention time (HRT) (10-1 d) on methane production performance and the stability of ASBR in treating acidified POME were evaluated herein. It was found that the highest methane productivity of 5.65 L CH₄/L/d could be attained at HRT of 2 d. However, the removal of chemical oxygen demand (COD) and volatile fatty acid (VFA) at this HRT is rather low (65-62%) hence making it inefficient to operate at HRT 2 d since most of the contaminants remained in the liquid streams. Thus the most recommended HRT was 3 d with maximum methane productivity of 3.96 L CH₄/L/d with corresponding methane yield of 260.3 L CH₄/kgCOD_removed. The COD removal efficiency at 3 d HRT was 71%, and the VFA consumption was more than 80%. The correlation of total VFA: total alkalinity (TVFA: TA) at HRT of 3 d was found to be 0.1. This recommended HRT of 3 is equally shorter than any previously reported application of POME as a substrate for thermophilic biomethane.     

Carbohydrate storage in anaerobic sequencing batch reactors

This study demonstrates the accumulation and degradation of trehalose as a storage compound in a glucose-fed anaerobic sequencing batch reactor (ASBR). One hour after substrate addition, only 40% of the added organic matter (as chemical oxygen demand, COD) was accounted for by the cumulative methane production and soluble COD remaining in the reactor. All influent COD was accounted for by methane and biomass production by the end of the 24-h ASBR cycle. These dynamics can be explained by the production of an intracellular storage product. Total carbohydrate analysis showed that 26% of the glucose added to the reactor transiently accumulated within the biomass. Based on ¹³C-nuclear magnetic resonance (NMR) analysis, trehalose (-d-glucopyranosyl-(d-glucopyranoside)) was identified as the main carbohydrate produced. Mathematical modeling was performed and the IWA Anaerobic Digestion Model No. 1 (ADM1) was modified to include microbial storage. The modified model adequately described the ASBR dynamics during a 24-h cycle.