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| Effect of Rhamnolipid on Hydrolase Activity During Anaerobic Digestion of Kitchen Residues |
| Received:March 18, 2015 |
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| KeyWord:rhamnolipid;kitchen residues;anaerobic digestion;hydrolase |
| Author Name | Affiliation | | NIU Jun-ling | Institute of Resources and Environmental Science, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China | | QIN Li | Agro-Environmental Protection of Agriculture ministry, Tianjin 300191, China | | ZHENG Bin-guo | Institute of Resources and Environmental Science, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China |
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| Abstract: |
| Anaerobic digestion of organic materials is directly affected by hydrolase activity. Here an experiment was performed to study the effect of biosurfactant rhamnolipid on the anaerobic digestion of kitchen organic residues at 35 ℃ for 25 days. The biosurfactant rates were 0%, 0.01%, 0.02%, 0.03%, 0.04%, and 0.05%. The activities of cellulase, amylase, protease, and lipase were measured. At rhamnolipid rates of 0.01%~0.03%, cumulative production of biogas increased greatly as rhamnolipid rates increased from 0.01% to 0.03%. At the rhamnolipid rate of 0.03%, cumulative biogas production was 40% greater than in the control. However, the increment of biogas production became smaller at higher rhamnolipid rates. Compared with the control, the removal of COD was about 70%, that of TS was more than 30%, and VS was about 50% by adding rhamnolipid at 0.03%. The activities of four hydrolytic enzymes were proportional to the rate of added rhamnolipid. At 0.03% of rhamnolipid, the cellulase, protease, lipase and amylase activities reached the peaks, which were 60.23%, 30.47%, 38.51% and 36.16% higher than those in the control, respectively. These findings showed that rhamnolipid could improve the hydrolase activity during the digestion of kitchen residues and that its appropriate addition rate should be around 0.03%. |
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