Effect of Nitrogen Sources on Biodegradation of Ammoniated Rice Straw by Microbial Consortium XCP-1

Key words: 
• the microbial consortium XCP-1；ammoniated rice straw；nitrogen source；biodegradation /
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Abstract: Biodegradation of rice straw using microbial consortium is an important way for conversion of bi‐omass into useful products .In the process of biodegradation ,nitrogen source is a main factor influencing the microbial grow th and digest efficiency .The mesophilic microbial consortium XCP‐1 (isolated from soil of continuous cropping cotton field in Xinjiang ) was employed to digest ammoniated straw .This study seeks to investigate the influence of organic nitrogen source on the microbial growth ,changes of NH3‐N and pH ,and biodegradation of rice straw .Results showed that organic nitrogen (corn lees and soybean meal) could increase microbial grow th and digestion of rice straw .It was further indicated that total nitro‐gen utilization rate of soybean meal (78.1% ) was higher than that of corn lees (41.2% ) .Moreover ,the degradation rate of ammoniated rice straw supplied with soybean meal was also higher than that of corn lees ,and degradation rate of cellulose ,hemicellulose ,lignin and total ammoniated rice straw were 78.4% , 85.6% ,14.3% and 68.3% ,respectively .While the nitrogen resource (corn lees or soybean meal) has lit‐tle effect on pH ,which was ranging from 5.0 to 9.5 .By adding economical nitrogen source (corn lees or soybean meal) ,biodegradation costs of rice straw can be reduced .It’s important for the industrialization production of biomass‐based products .