Study on Modification of Corncob and Straw as Slow-release Carbon Sources
In order to solve the problem of insufficient carbon source in low C/N wastewater treatment,the carbon,nitrogen and phosphorus release characteristics and the biochemical performance of corncob and straw treated by different modification methods were studied as solid slow-release carbon source.The modification reagents are NaOH solution,H2 O2 solution and the admixture of the former two.After modification,mass change of solid carbon source,the release law of COD,NH+4-N,TN and TP in the leaching solution were continuously determined and analyzed by static test.The carbon release capacity of the pretreated solid carbon source is improved to varying degrees,and the quality reduction of alkali treatment group was the most obvious among them.The corncob with alkali treatment has good and lasting carbon release capacity,and has the almost negligible release of nitrogen and phosphorus.The biodegradability of corncob and straw after alkali treatment was improved,and the biodegradability of corncob was more obvious,which is more suitable for microbial growth and reproduction than that of straw.So the corncob treated with alkaline solution is more suitable as a solid slow-release carbon source for nitrogen and phosphorus removal of low C/N wastewater.
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