Experimental Study On Docomposting Human Feces With Beanstalk And Sawdust As Substrate

The mixture of beanstalk and sawdust and pure beanstalk were used to decompose human feces as substrate, the s-15 bio-toilet presented by Japan Science and Technology Agency was employed in this experiment. The contents of experiment: study on parameter variation rules of mixture substrate; comparative analysis parameter of mixture substrate and pure beanstalk and evaluation of stability and compost maturity of two substrates.The key research results of the paper were as follows:(1) Bad odor could effectively be removed. Temperature and water content of mixture substrate had very good steability during the course of reaction, average temperature maintained at 45℃, water content holded at 50%, could effective accelerate growth and propagation of microorganisms.(2) The decrease of weight was obviously after 19 weeks, human feces was decreased by 359.05kg and 97.7%, when the mixture substrate was as reaction substrate; Human feces was decreased by 410.83kg and 96%, when pure beanstalk was as reaction substrate. Apparent distinction and seed germination experiment proved that compost maturity of the final reacting substance was good and could achieve the request of stability, safe and avoiding re-pollution of the environment.(3) Mixture as substrate of bio-tiolet was better than pure beantalk in the experiment. Pure beanstalk substrate was worse in removing odor when water content was up to 50%. In addition, the bad hygroscopicity of pure beanstalk and high PH value caused ammonia easier to volatile, which caused bad odor and nutrient elements loss. Finally nitrogen content was lower and about half of nitrogen content in human feces when mixture was as reaction substrate.