So using sludge and bacterial sludge can increase the microorganism number, raise microorganism activity and accelerate changeover of organic matter in the soil, thus increasing the fertility of soil.
施入底泥、菌泥均可增加土壤微生物数量，提高微生物活性，加快土壤有机成分转化，提高土壤肥力。
2
Quite a number of expenses were paid for chemical consumption in thickened sludge de-watering operation in municipal wastewater treatment plant.
城市污水处理厂污泥浓缩脱水的药剂消耗是主要的运行费用。
3
The bodies of the missing, along with an undermined number of animals, were believed to be buried under the meters-deep sludge.