为了研究低DO下负荷对污泥膨胀的影响,采用SBR反应器,在DO〈0.5 mg.L-1,pH 7.2~8.0,温度（23±0.5）℃,MLSS 3000~3500 mg.L-1,负荷分别为0.22、0.44、0.66 g COD.（g MLSS）-1.d-1的条件下,研究不同负荷下的SVI变化趋势、污泥膨胀...为了研究低DO下负荷对污泥膨胀的影响,采用SBR反应器,在DO〈0.5 mg.L-1,pH 7.2~8.0,温度（23±0.5）℃,MLSS 3000~3500 mg.L-1,负荷分别为0.22、0.44、0.66 g COD.（g MLSS）-1.d-1的条件下,研究不同负荷下的SVI变化趋势、污泥膨胀类型、引发原因、耗氧速率、脱氮除磷效果与同步硝化反硝化率。结果显示,低DO下（〈0.5 mg.L-1）,负荷0.22 g COD.（g MLSS）-1.d-1时未发生污泥膨胀,随着负荷升高,污泥沉降性恶化加快。并且不同负荷引发的污泥膨胀类型不同,在负荷0.66 g COD.（g MLSS）-1.d-1时发生黏性膨胀,而负荷0.44 g COD.（g MLSS）-1.d-1时发生丝状菌微膨胀。黏性膨胀时出水氨氮及磷去除效果变差,但丝状菌膨胀时出水水质并没有受到影响,且比吸磷速率更快,出水SS更低。未发生污泥膨胀时同步硝化反硝化率最大,丝状菌膨胀时次之,黏性膨胀时最小。SOUR过高时,很可能伴随着污泥沉降性变差和出水水质恶化。展开更多
In order to investigate the competition for carbon source between denitrification and phosphorus release processes,simultaneous phosphorus release and denitrification in sludge operated in anoxic,aerobic mode are inve...In order to investigate the competition for carbon source between denitrification and phosphorus release processes,simultaneous phosphorus release and denitrification in sludge operated in anoxic,aerobic mode are investigated by varying the ratio of influent COD to nitrogenous compound concentration under anoxic condition using a lab-scale sequencing batch reactor（SBR）.The results show that the nitrate reduction rate is nearly independent of the ratio of influent COD to nitrate under anoxic condition.More NOx^--N in the influent leads to less PO4^3--P release during the feeding period.However, PO4^3--P release proceeds at a low rate simultaneously with denitrification even when the influent NOx^--N concentration is as large as 20 mg·L^-1and its rate is increased obviously when NOx^--N is denitrified to a concentration lower than 0.5 mg·L^-1.The variation of pH during anoxic period gives some information about the biochemical reactions of denitrification and PO4^3--P release.When more nitrate is present in the influent,more acetate uptake in feeding period is used for direct microorganism growth.展开更多
文摘为了研究低DO下负荷对污泥膨胀的影响,采用SBR反应器,在DO〈0.5 mg.L-1,pH 7.2~8.0,温度（23±0.5）℃,MLSS 3000~3500 mg.L-1,负荷分别为0.22、0.44、0.66 g COD.（g MLSS）-1.d-1的条件下,研究不同负荷下的SVI变化趋势、污泥膨胀类型、引发原因、耗氧速率、脱氮除磷效果与同步硝化反硝化率。结果显示,低DO下（〈0.5 mg.L-1）,负荷0.22 g COD.（g MLSS）-1.d-1时未发生污泥膨胀,随着负荷升高,污泥沉降性恶化加快。并且不同负荷引发的污泥膨胀类型不同,在负荷0.66 g COD.（g MLSS）-1.d-1时发生黏性膨胀,而负荷0.44 g COD.（g MLSS）-1.d-1时发生丝状菌微膨胀。黏性膨胀时出水氨氮及磷去除效果变差,但丝状菌膨胀时出水水质并没有受到影响,且比吸磷速率更快,出水SS更低。未发生污泥膨胀时同步硝化反硝化率最大,丝状菌膨胀时次之,黏性膨胀时最小。SOUR过高时,很可能伴随着污泥沉降性变差和出水水质恶化。
基金Supported by the Scientific Innovation Platform of Beijing Municipal Education Commission(PXM2008_014204_050843)State Key Laboratory of Urban Water Resource and Environment(HIT)(QAK200802)Environment and Water Industry(EWI)Development Scheme of Singapore-The Process Control and Enhanced Biological Nutrient Removal of CSTR Proc-ess(EDB S07/1-53974082)
文摘In order to investigate the competition for carbon source between denitrification and phosphorus release processes,simultaneous phosphorus release and denitrification in sludge operated in anoxic,aerobic mode are investigated by varying the ratio of influent COD to nitrogenous compound concentration under anoxic condition using a lab-scale sequencing batch reactor（SBR）.The results show that the nitrate reduction rate is nearly independent of the ratio of influent COD to nitrate under anoxic condition.More NOx^--N in the influent leads to less PO4^3--P release during the feeding period.However, PO4^3--P release proceeds at a low rate simultaneously with denitrification even when the influent NOx^--N concentration is as large as 20 mg·L^-1and its rate is increased obviously when NOx^--N is denitrified to a concentration lower than 0.5 mg·L^-1.The variation of pH during anoxic period gives some information about the biochemical reactions of denitrification and PO4^3--P release.When more nitrate is present in the influent,more acetate uptake in feeding period is used for direct microorganism growth.
