污泥堆肥工艺优化及堆肥产品农用效果研究OACHSSCD

To reduce the cost of sludge composting and optimize composting process parameters,while verifying the agricultural feasibility of compost products,three types of sludge composting experiments were conducted to analyze composting process characteristics,product physicochemical properties,and economic costs.Using lettuce as the test crop,planting experiments and seed germination tests were carried out with different addition ratios of compost products to evaluate the agricultural effects of the compost products.The results showed that by adding 1 000 kg of municipal dewatered sludge,450 kg of the first type of composted material,and 50 kg of oil cake,the fertility of the obtained mature sludge met the fertility standards for organic fertilizers.The composting experiment results indicated that after replacing auxiliary materials with recycled materials,the composting operating cost was significantly reduced to 224.2 yuan per ton of sludge,with a weight reduction rate of 41.8%and a volume reduction rate of 27%.The optimal application ratio of the compost product was 30%.Excessive use of the compost product inhibited seed germination,so its application ratio should be strictly controlled during agricultural use.This study provides a theoretical basis and data support for the large-scale promotion of sludge composting processes and the safe agricultural use of compost products.