施用污泥堆肥对土壤环境及高羊茅生长的影响

以上海曲阳水质净化厂污泥堆肥为研究对象，采用盆栽和土柱模拟的方法研究了污泥堆肥土地利用对土壤环境和植物生长的影响。结果表明，污泥堆肥和滩涂土混配后可降低土壤pH值，提高土壤养分含量，增加高羊茅生物量，同时也增加了土壤Ph、Cu和Zn3种重金属元素含量，但各混合土壤中重金属含量均远低于土壤环境质量Ⅱ类标准。另外，污泥堆肥混配土壤基本不存在病原菌扩散的风险；土柱淋溶试验表明，污泥堆肥施用比例为10％时，不会导致地下水NO3-N和重金属含量超过地下水Ⅱ类标准。综上，污泥堆肥施用比例只要控制在10％以内，可安全进行土地利用。

Effects of Application of Sewage Sludge Compost on Soil Environment and Festuca arundinacea Schreb

Effects of land utilization of Shanghai Quyang sewage sludge compost on soil environment and tall fescue （Festuca arundinacea Schreb ）growth were carried out by using pot scale experiments and leakage facilities. The results showed that mixture of sludge compost-soil simulating the application on land decreased pH, increased contents of nutrient elements including total nitrogen, total phosphorus, organic matter and available forms of nitrogen, phosphorus in the soil. Biomass of tall fescue（Festuca arundinacea Schreb ）during 5.5-month cultivation period was increased by 319.3%, 426.9% and 178.0% with sewage sludge compost application ratios of 5%, 10% and 20%, respectively. In general, mixture of sludge compost-soil significantly increased the level of Pb, Cu, Zn in the soil, but these concentrations were significandy under the 2nd grade national environmental quality standard for soils. In addition, there is no risk of contamination of pathogenic bacteria in mixed soils. Soil column leakage experiments indicated that the contents of NO3-N and heavy metals do not surpass the 2nd grade national quality standard for groundwater with 10% application rate of sewage sludge compost in the mixed soil. In a word, the sewage sludge compost can be safely applied to land as long as the application rate of sewage sludge compost was controlled fewer than 10%.