沸石添加剂对污泥堆肥过程中的氨挥发及相关因素的影响

以污泥和秸秆为基本堆肥原料,向其中添加不同比例的沸石(5%和10%),采用密闭室动态吸收法,分析了污泥堆肥过程中的氨挥发速率以及氨挥发的相关影响因素。结果表明:堆肥中添加5%和10%的沸石,与对照相比显著降低了氨挥发累积速率27.9%和48.7%,并且延迟1 d出现氨挥发峰值。沸石添加剂对氨挥发影响因素温度、pH 值、EC 和NH₄⁺-N 均有显著影响,添加沸石缩短堆肥高温期3 d,降低堆肥中后期堆体温度(降幅为0.17~13.5 益),增加堆体0.09~0.22 个pH 单位,维持堆肥更低电导率(1 876.7~2 636.7 uS·cm^-1),降低堆体NH₄⁺-N 9.07%~22.2%。污泥堆肥中添加沸石降低了氨挥发累积速率,保留了堆体中的有效氮,在堆肥工程中具有较为广阔的应用前景。

Effects of Zeolite Addition on Ammonia Volatilization and Influence Factors in Sludge Composting

An experiment of sludge composting was conducted to study the effects of zeolite addition(occupying the wet weight of sludge and straw 5% and 10%)on ammonia volatilization and influence factors. Sludge and straw were raw materials. The results indicated that adding 5% and 10% zeolite to the sludge could significantly decrease the NH3 volatilization cumulative rate of 27.9% and 48.7%. The pH value of composting with zeolite addition increased 0.09~0.22 compared with the contrast. Electrical conductivity(EC)of composting with zeolite addition maintained lower level which were 1 876.7~2 636.7 uS·cm^-1. Zeolite addition decreased the content of NH₄⁺-N by 9.07%~22.2% when compared with the contrast. Zeolite as an additive in sludge composting could decrease the cumulative rate of ammonia volatilization. Thus, zeolite is a new potential additive which will bring prospects of application in sludge composting.