Research of Pharmaceutical Sludge on Choosing Compost Technology and Evaluation of Fertilizer Efficiency

Abstract

This paper confirmed the best compost process and parameter of pharmaceutical sludge by forced aerated compost experiment. The volume ratio between sludge and straw is 2:1. The first fermentation is 0-14 days and the primary ventilation quantity is 6m3/h·m3. The second fermentation is 15-35 days. 35 days later, the sludge will be moved from compost tank to space for the post-processing period. 50 days later, composting sludge is completely decomposed. The application effect of sludge fertilizer was analyzed on the lawn and desert land. Rotten sludge fertilizer can raise soil fertility, promote the growth of grass, and be applied in urban greening, and then this can avoid the heavy metals and harmful material entering the food chain. That the sludge fertilizer exploited in desert soil can improve the sand soil nutrient effectively and amend the poor physical and chemical properties of desert soil. Therefore, the entire achievement can be used to strengthen wind prevention and sand fixation and treat ecosystem recession of desert land.