A/O系统中不同缺氧/好氧体积比对活性污泥沉降性能的影响

为探究A/O系统中不同的缺氧与好氧体积比与活性污泥沉降性能的关系,以实际生活污水为进水水质,考察了不同的A/O比(2/6,4/4,6/2)对污泥沉降性能和丝状菌生长的影响.结果表明,当A/O比为2/6时,系统能够维持良好的沉降性能,优势丝状菌为Type 0041;当A/O比为4/4时,系统的沉降性能恶化,SVI最高达到357mL/g,优势丝状菌为Type 0041,Type 1701;当A/O比为6/2时,系统发生了微膨胀现象并实现了稳定的短程硝化反硝化,优势丝状菌为Thiothrix.nivea.可见不同的A/O比对活性污泥沉降性能影响较大,同时污泥胞内胞外贮存特性及系统的脱氮除磷性能也受到严重影响.

Effect of different anoxic/aerobic volume ratio on activated sludge settleability in A/O system

In order to reveal the corelations of A/O ratio and sludge settleability, the effect of different volume ratio (2/6,4/4,6/2) on activated sludge settleability and community of filamentous fungus was investigated with domestic wastewater as influent during long-term operation. The resuls showed that good settleability of system was maintained when A/O ratio was 2/6, and the dominant filamentous bacteria was Type 0041.When A/O ratio was increased to 4/4 the system occurred bulking sludge with SVI up to 357mL/g, and the dominant filamentous bacteria were Type 0041,Type 1701. When A/O ratio of 6/2 was adopted, the system occurred slightly bulking sludge and realised stable shortcut nitrification and denitrification. So different A/O ratio had great influence on activated sludge settleability, at the same time the intracellular and extracellular storage characteristics of activated sludge and denitrification and phosphorus removal performance of the system were also severely affected.