Experimental Research On Degradation Performance Of Rice Straw Modified By Epoxy Chloropropane

To investigate the degradation performance of epoxy chloropropane modified rice straw and natural rice straw, biodegradation and photodegradation experiments were carried out.In the experiments of biodegradation, microbes from soil and Hun River were cultivated at constant temperature, purified and used to degrade cellulose. The iodometric method was used to measure the comentration of glucose in solution. The rate of glucose generation of natural rice straw was higher than that of modified rice straw under aerobic and anaerobic condition. The weight loss of natural rice straw was higher over 15% than that of modified rice straw. Modified rice straw could be biodegradated at a rate lower than natural rice straw.Gram's staining method was used to measure bacterial biodegradation with soil as vaccinal resource. In aerobic for biodegradation, for natural rice straw bacilliform gram-positive bacterium and gram-negative bacterium were observed, for modified rice straw bacilliform gram-positive bacterium and orbicular gram-negative bacterium were found. In anaerobic for biodegradation, for natural rice straw bacilliform gram-positive bacterium, gram-negative bacterium and orbicular gram-negative bacterium were observed, for modified rice straw bacilliform gram-positive bacterium and gram-negative bacterium, orbicular gram-positive bacterium and gram-negative bacterium and a little amount of spiral helicine gram-negative bacterium were found.Photodegradation experiment was carried with QUV/basic ageing oven. After being exposed to ultraviolet light for 600h, the weight losses of natural rice straw and modified rice straw were 2.50% and 2.49% respectively. It could be seen that degradation rate of modified rice straw was almost the same with that of natural rice straw.In use the Gram's staining the measurement bacterial photo of nature rice straw and modified rice straw after biodegradation under soil as vaccinal resource, We can find that under aerobic condition in the nature rice straw after biodegradation mainly is bacilliform gram-positive bacterium and gram-negative bacterium, in the nature rice straw modified by epoxy chloropropane after biodegradation mainly is bacilliform gram-positive bacterium and orbicular gram-negative bacterium. Under anaerobic condition in the nature rice straw after biodegradation mainly is bacilliform gram-positive bacterium, gram-negative bacterium and orbicular gram-negative bacterium, in the nature rice straw modified by epoxy chloropropane after biodegradation mainly is bacilliform gram-positive bacterium and gram-negative bacterium, orbicular gram-positive bacterium and gram-negative bacterium, also exist a little amount of spiral helicine gram-negative bacterium.Infrared spectrum technique was employed to measure the structure of natural rice straw and modified rice straw before and after photodegradation. It was showed aliphatic compound broke up with missing methyl. At the same time, cellulose, hemicellulose, saccharide and other carbohydrate also broke up, and made mineral SiO2.Mass spectrography was used to determine the photodegradated products of natural rice straw and modified rice straw. It could be seen photodegradation products both natural rice straw and modified rice straw were very complicated. Compared with standard mass chromatograms, photodegradation of natural rice straw produce might 5 kinds of organic compounds:C9H20, C8H14, C9H16, C10H20O and C12H24O. On the other hand modified rice straw produce more complicated compounds than natural rice straw. About 24 kinds of organic compounds were observed, such as C9H20, C10H22, CnH2n2 (n:6～11,13 and 14), CnH2n+2O (n:7,9～13) and CnH2n-2O (n:4,6-11,13).