Beijing Research Institute of Environmental Sciences and Beijing Academy of Agricultural Sciences cooperated on the sludge from the sewage treatment plant in Miyun County, Beijing, and processed it into composite fertilizer through composting and carried out experiments for use in farmland. The plant handles 15,000m3 of urban sewage per day, with a sludge production of 5-6t/d (80% water content), and the sludge is of good quality due to the acidification- aerobic sewage treatment process. A certain amount of N, P, K was added to make a compound fertilizer (the ratio of N, P, K was 1:0.9:0.4), and directly granulated as sludge granular fertilizer. Through the winter wheat field test in Panggezhuang, Daxing County, Beijing, as well as the seedling pot fertilization test of rape and corn in the greenhouse, all of them achieved promising results. As it is made into granular sludge fertilizer, it is easy to transport and store.
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