【摘要】 为研究耐盐污泥膨胀发生的原因、过程以及控制方法,利用革新MUCT工艺重点考察了10 mg.L-1盐度长期驯化的耐盐污泥在低溶解氧条件下发生污泥膨胀的过程。通过不同方式进行控制,同时比较膨胀前后系统对有机物和氮磷的去除能力,结合污泥微膨胀节能理论提出利用污泥微膨胀提高含盐污水生物处理效率的方法。结果表明:耐盐污泥在长期低溶解氧条件下会发生膨胀;盐度降低导致污泥膨胀加剧;提高盐度可有效抑制其膨胀;当好氧2段溶解氧(DO2)维持在1.0 mg.L-1,好氧1段溶解氧(DO1)维持在2.0 mg.L-1时,污泥容积指数(SVI)维持在190~210 ml.g-1之间,稳定处于微膨胀状态。微膨胀状态下系统出水浊度大大降低,可以利用低氧微膨胀状态提高含盐污水处理效率。更多还原

【Abstract】 In order to find out the reason of the filamentous sludge bulking in salt-tolerant sludge during saline wastewater treatment,a lab-scale nutrient removal activated sludge system,based on the modified MUCT configuration,was used to identify the occurrence process of filamentous sludge bulking.The sludge was acclimated for a long period at 10g·L-1 salinity in the MUCT process and was observed to have plenty of filamentous organisms under low dissolved oxygen concentration condition.Different operation strategies were used to control the filamentous sludge bulking.The pollutants removal efficiencies during each control periods were compared as well.The results indicated that filamentous sludge bulking in salt-tolerant sludge occurred at a low DO concentration.Increased salinity inhibited sludge bulking quickly and efficiently.Limited filamentous sludge bulking could be maintained for a long time when ρ(DO2) was controlled at 1.0 mg·L-1 and ρ(DO1) was controlled at 2.0 mg·L-1.The value of sludge volume index(SVI) varied between 190 ml·g-1 and 210 ml·g-1.During this period,the effluent turbidity decreased significantly due to the filtering effect of filamentous bacteria.It could be an option to solve the turbidity problem of saline wastewater treatment.更多还原