Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Hong Kong SAR.
Waste Manag Res. 2011 Nov;29(11):1164-70. doi: 10.1177/0734242X11420600. Epub 2011 Oct 10.
Composting sewage sludge alone would reduce the decomposition efficiency due to free limited porosity in sludge. To alleviate this, the use of horse stable straw bedding waste (HSB) was evaluated as a co-composting material with sewage sludge in a 10 tonnes day(-1) in-vessel composter for a period of 7 days before curing in a static aeration pile. Sludge was mixed with HSB at 1 : 1.5 (HSL) and 1 : 2.9 (LSL) on a fresh weight basis. After a composting period of 56 days, both mixing ratios demonstrated to be feasible with LSL having a better organic decomposition and a shorter time to reach maturity. The overall decomposition rates were 52.0 and 58.9% (dry weight basis) for HSL and LSL, respectively. In both treatments, temperature in the in-vessel composters could reach 65°C, which was sufficient to remove the pathogens. Although both products were free of pathogens, HSL exhibited a higher ammoniacal nitrogen contents but a lower seed germination index than that of LSL indicating a higher phytotoxicity and a longer curing period would be required. It can be concluded that HSB provided a better composting conditions at a mixing ratio of 1 : 2.9.
单独堆肥污泥会由于污泥中自由孔隙度有限而降低分解效率。为了缓解这一问题，评估了马厩垫料废物（HSB）作为与污水污泥一起进行共堆肥的材料，在静态曝气堆肥中陈化之前，在 10 吨/天的容器堆肥器中进行了为期 7 天的共堆肥。污泥与 HSB 按新鲜重量比 1:1.5（HSL）和 1:2.9（LSL）混合。在 56 天的堆肥期后，两种混合比都表现出可行性，LSL 具有更好的有机分解和更快达到成熟的时间。HSL 和 LSL 的总体分解率分别为 52.0%和 58.9%（干重基础）。在两种处理中，容器堆肥器中的温度都可以达到 65°C，足以去除病原体。尽管两种产品均不含病原体，但 HSL 的氨态氮含量较高，种子发芽指数较低，表明其具有更高的植物毒性，需要更长的陈化时间。可以得出结论，HSB 在 1:2.9 的混合比下提供了更好的堆肥条件。
