脱水污泥及其堆肥过程中聚丙烯酰胺的检测

Determination of Polyacrylamide during Composting of Dewatered Sludge

建立了一种从固体样品中提取PAM的方法,即先用蒸馏水三次提取样品中的PAM,并控制测试液中PAM的浓度为0.5～50 mg/L,然后用淀粉一碘化镉分光光度法测定PAM含量.试验测得,取自上海某污水处理厂的脱水污泥样品中PAM的含量在6.28 mg/g（干基）左右,污泥与回料（经多次回流堆肥试验得到的熟料）按体积比为1：2混合后的堆肥物料中PAM含量为2.67 mg/g.在连续通风条件下,经过12 d高温好氧发酵,堆肥物料中PAM的含量降至1.38 mg/g,降解率为48.8%.可见,高温好氧发酵对降解脱水污泥中PAM具有良好的效果.

A method of extracting polyacrylamide （PAM） from solid samples was proposed. In this method, PAM in solid samples was first extracted three times using distilled water, controlling its concentration at 0.5 to 50 mg/L, and then, its concentration in the extracts was determined by adopting the starch-cadmium iodide method. The concentration of PAM in the dewatered sludge samples from a wastewater treatment plant in Shanghai is 6.28 mg/g （dry basis, the same below） , and after mixing the sludge with feeding compost according to the volume ratio of 1 ： 2, the concentration of PAM is reduced to 2.67 mg/g. After 12 days for thermophilic aerobic fermentation under the condition of continuous ven- tilation, the concentration of PAM in the compost materials is dropped to 1.38 mg/g, with the degrada- tion rate of 48.8%. Thus, the thermophilie aerobic fermentation technology has a favorable effect on degradation of PALM in dewatered sludge.