Study On Influence Of Organic Loading On Efficiency Of Up-Flow Multistage Anaerobic Reactor And Granular Sludge

The Up-flow Multistage Anaerobic Reactor(UMAR), which has been developed based on Internal Circulation Reactors(IC), is a high efficiency anaerobic reactor. A laboratory-scale UMAR reactor was used to study on the disposing of oxidized metamorphic starch wasterwater, mainly taking accunt of influence of organic loading on efficiency of UMAR reactor and characteristics of anaerobic granular sludge. And then the substrate degradation kinetics equation of UMAR was fundamented.1. The research of different organic loading on efficiency of UMAR reactor shows that: when the volumetric loading between 9-21.6kgCOD/(m³Â·d), the reactor was operating in good condition, COD removal rate remained above 80%, the gas veliocity of volume kept a upward trend and increased significantly, the gas veliocity of materials stabilized at 0.5m³/kgCOD, the effulent VFA concentration was below 3.5mmol/L. When the volumetric loading between 21.6-30.24kgCOD/(m³Â·d), with the volumetric loading increasing, the COD removal and the gas veliocity of material decreased, the effulent VFA concentration increased significantly, but the reactor was still in the steady state. Continuing to increase the volumetric loading to 36kgCOD/(m³Â·d), the stability was damaged. The greatest volumetric loading of UMAR reactor can achieve 30.24 kgCOD/(m³Â·d).2. The distribution of sludge concentration, the particle size distribution, the settling velocity, the chemical elements and the specific methanogenic activity were different during different operationl stages. The characteristics of granular sludge in high-loading operational stage were best. The characteristics of granular sludge in different height of UMAR reactor were different, too. The granular sludge at the bottom of UMAR reactor has higher sludge concentration, larger particle size and higher settling velocity. The specific methanogenic activity and the coenzyme F420 of granular sludge were highest in the middle part of first reactor compartment. Through SEM, the bacteriums on granluar sludge surface performanted area distribution and local area formationed of a variety of bacterial cross-cutting and orderly network structure.3. The substrate degradation kinetics model of UMAR reactor were fundamented based on the law of material balance and parameters were set up through the experimental data. The substrate degradation kinetics equation as following:The saturation constant k_s is 5845.31mg/L, the most substance parity removal rate V_max is 2.9511 d^-1. The concentration of effluent matrix S_e becomes smaller with the increasing of HRT in UMAR reactor fine handling area.