盐度对序批式生物反应器污泥膨胀的影响

    Effect of different salinity on sludge bulking by using sequencing batch reactor

    • 摘要: 为了研究盐度对污泥膨胀的影响,采用序批式生物反应器(sequencing batch reactor,SBR)处理含盐废水,考察NaCl、Na2SO4和Na3PO4盐度变化对污泥沉降性和污染物去除效果的影响。结果表明,当NaCl和Na2SO4盐度由0升高至30 g/L时,污泥容积指数(sludge volume index,SVI)由135 mL/g下降至71~73 mL/g,总氮(total nitrigen,TN)去除率由80%下降到60%,胞外聚合物(extracellular polymeric substance,EPS)质量浓度由521~523 mg/L升高到896~917 mg/L,污泥沉降性良好;当Na3PO4盐度由0升高至8 g/L时,SVI由135 mL/g升高至198 mL/g,TN去除率由80%下降至60%,EPS质量浓度由549 mg/L升高到674 mg/L,发生污泥膨胀。随着NaCl和Na2SO4盐度的提高,污泥沉降性能提高,TN去除率下降,EPS质量浓度升高。随着Na3PO4盐度的提高,污泥沉降性能和TN去除率均下降,EPS质量浓度升高。然而,随着NaCl(30~0 g/L)、Na2SO4(30~0 g/L)和Na3PO4(8~0 g/L)盐度的降低,SVI值分别由71 mL/g升高至298 mL/g,73 mL/g升高至291 mL/g和198 mL/g升高至241 mL/g,TN去除率分别由62%下降至43%,65%下降至44%,70%下降至35%,EPS质量浓度分别由917 mg/L升高至1 092 mg/L,896 mg/L升高至1 078 mg/L,674 mg/L升高至759 mg/L。随着NaCl、Na2SO4和Na3PO4盐度由高降低后,污泥沉降性能和TN去除率均下降,EPS质量浓度继续升高,盐度降低后发生了污泥膨胀。

       

      Abstract: Abstract: In order to study the effect of different salinity on the sludge bulking, a continuous experiment was carried out to treat wastewater containing saline by using sequencing batch reactor(SBR). The effect of changes of NaCl, Na2SO4 and Na3PO4 salinity on the removal efficiency of pollutant and settleability of activated sludge were investigated when sodium acetate was used as carbon source. The results showed that under the condition of dissolved oxygen (DO) of 3mg/L, sludge volume index(SVI) was dropped from 135mL/g to 71mL/g, and removal efficiency of total nitrogen(TN) was dropped from 80% to 60% and extracellular polymeric substance(EPS) was increased from 521mg/L to 917mg/L, and the sludge performed a favorable settleability when NaCl salinity was increased gradually from 0 to 30g/L. When the Na2SO4 salinity was increased gradually from 0 to 30g/L, SVI was dropped from 135mL/g to 73mL/g, and removal efficiency of TN was dropped from 81% to 60% and EPS was increased from 523mg/L to 896mg/L. However, when Na3PO4 salinity was increased gradually from 0 to 8g/L, SVI was increased from 135mL/g to 198mL/g, and removal efficiency of TN was dropped from 80% to 60% and EPS was increased from 549mg/L to 674mg/L. And furthermore, sludge bulking was produced. When the salinity of NaCl and Na2SO4 was increased, removal efficiency of TN was decreased, sludge settleability and EPS mass concentration was increased. When the salinity of Na3PO4 increased, sludge settleability and removal efficiency of TN were decreased, EPS mass concentration was increased. However, with the decreasing salinity of NaCl (30~0g/L), Na2SO4 (30~0g/L) and Na3PO4 (8~0g/L), SVI was increased from 71mL/g to 298mL/g, 73mL/g to 291mL/g and 198mL/g to 241mL/g, respectively, and removal efficiency of TN was dropped from 62% to 43%, 65% to 44% and 60% to 35%, respectively, and EPS was increased from 917mg/L to 1092mg/L, 896mg/L to 1078mg/L and 674mg/L to 759mg/L, respectively. After salinity of NaCl, Na2SO4 and Na3PO4 reduced from high value to low value, sludge settleability and removal efficiency of TN decreased, and EPS mass concentration continued to increase. Sludge bulking was produced after the salinity was reduced. (英文未粘)

       

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