优化复合调理促进含油污泥自持燃烧

对石化企业污水厂的含油剩余活性污泥进行超声-臭氧-生物质复合调理，破坏其稳定的胶体体系，降低泥饼的含水率，并对含油污泥复合调理的pH、温度、真空压力、超声波频率等影响因素进行优化；结果表明，在温度为35℃，pH值为3.0~5.0，超声波频率为33.2 kHz时，经生物质复合调理后，保持0.06 MPa真空压力抽滤10 min，滤饼的含水率可降到58.58%，满足污泥自持燃烧的要求；同时，从污泥絮体结 构、能量变化角度分析了不同温度和pH、超声波频率对含油污泥的作用机制；发现在偏酸性条件下，可减小污泥表面亲和力，促进污泥絮体凝聚；添加生物质在降低污泥含水率的同时也会降低污泥强度和可塑性；超声波对污泥除高能量作用外还具有空化作用，优化协调各因素对污泥絮凝沉降乃至自持燃烧作用均显著。

Optimization of Co-conditioning treatment promotes self-sustained combustion of oil sludge

Excess oil sludge from the sewage treatment plants of petrochemical enterprises is a stable colloidal system. Sludge treated with co-conditioning and mechanical dewatering can significantly present low moisture content, reduced volume, and high calorific properties, which is good for the post-treatment processes. In this study, pH, temperature, vacuum pressure, and ultrasonic frequency in the co-conditioning treatment processes were analyzed, and the results showed that the moisture content of oil sludge was reduced to 58.58% during the ozone-sonication-biomass co-conditioning treatment processes, with the following conditions:temperature of 35℃, pH values of 3.0 to 5.0, sonication frequency of 33.2 kHz, vacuum pressure of 0.06 MPa, and filtering time of 10 min. The treated sludge showed self-sustained combustion characteristics. At the same time, the mechanisms of different factors on oil sludge have been analyzed, from the characteristics of sludge floc and energy change.