Abstract

As a by-product of municipal sewage treatment, sewage sludge must be properly treated to avoid secondary pollution to the environment. Aerobic composting is one of the mainstream technologies in sludge treatment, but nitrogen loss in composting process usually reaches more than 40%, which seriously reduces the fertilizer efficiency of composting products, and at the same time, a large amount of odor will cause harm to the environment. In this article, the nitrogen emission and nitrogen loss were reduced by adding sawdust of different proportions in the sludge composting process, and the nitrogen emission and nitrogen loss were reduced by up to 70% and 30% respectively. The addition of sawdust can significantly increase the sludge composting temperature and duration of high temperature period, reduce the sludge pH and water content, increase the mineralization rate of organic matter, thereby inhibiting the nitrogen loss. The results showed that nitrogen loss decreased with the increase of sawdust ratio, and A30 was the best ratio. The process has the advantages of simple operation, low cost and good nitrogen holding effect.

摘要

污水污泥作为城市污水处理的副产品，必须妥善处理，避免对环境造成二次污染。好氧堆肥是污泥处理的主流技术之一，但堆肥过程中氮素损失通常达到40%以上，严重降低了堆肥产品的肥效，同时大量的臭味会对土壤造成危害。环境。本文通过在污泥堆肥过程中加入不同比例的木屑，减少了氮排放和氮损失，氮排放和氮损失分别减少了70%和30%。添加木屑可显着提高污泥堆肥温度和高温期持续时间，降低污泥pH值和含水量，增加有机质的矿化率，从而抑制氮的流失。结果表明，随着锯末配比的增加，氮素流失量减少，A30为最佳配比。该工艺操作简单，成本低，持氮效果好。