颗粒污泥处理高负荷有机含油废水的形成过程及特性探究

在序批式反应器(SBR)内接种絮状物质,以实际高负荷含油废水为探究对象,在中温条件下考察了进水有机负荷(OLR)对颗粒污泥形成的影响,分析了OLR对颗粒污泥粒径、生物量、微生物活性、胞外聚合物(EPS)组成的演化规律,探究了OLR影响颗粒污泥对化学需氧量(COD)与溶解性油类的去除特性.结果表明,当进水OLR由0.5 ...

Study on the Cultivation Process and Characteristics of Granular Sludge in Treatment of High-load Organic Oily Wastewater

Flocculent substances were inoculated in the sequencing batch reactor(SBR), and the actual high-load organic oily wastewater as the object,the effect of influent organic loading(OLR) on the formation of granular sludge was investigated under medium temperature conditions. The evolution of particle size, biomass, microbial activity and extracellular polymer(EPS) composition of granular sludge were analyzed. The removal characteristics of chemical oxygen demand(COD) and dissolved oil of granular sludge affected by OLR was explored. The results showed that when the influent OLR increased from 0.5 kg/(m³·d) to 3.0 kg/(m³·d), the mixed liquid total suspended solids(MLTSS) increased to 9.2 g/L, the volume index(SVI30) decreased to 61.6 mL/g, and the particle size of granular sludge mainly concentrated in 0.8~1.2 mm, accounting for about 40.2%. In addition, OLR affected EPS components in granular sludge, with the increase of influent OLR, the contents of protein(PN) and polysaccharide(PS) in granular sludge increased, but the content of PN increased significantly. When the OLR was 3.0 kg/(m³·d), the removal efficiencies of COD and dissolved oil by granular sludge were the highest, which was 92.3% and 79.5%, respectively, significantly higher than other OLRs. The results of this study provided a theoretical reference for the treatment of oily wastewater by rapid cultivation of granular sludge.