| Gibberellin(GA) are widely used in agricultural production as an agricultural antibiotic in promoting plant growth. Production of GA will generate the productive biowaste- GA fermentation residue, GA fermentation residue is made rich of organic matter and a small amount of residual GA. With the increasing environmental awareness as well as the improvement of relevant provisions in the antibiotic waste disposal constantly, the disposal of GA fermentation residue has become an important problem of business operations and a potential risk of the surrounding environment. This paper has studied in the pretreatment of GA fermentation residue as well as its anaerobic biochemical properties, and further study of GA fermentation residue mixed with food waste is given in order to provide a theoretical basis as well as laboratory reference significance, valuable operating parameters and control for the industrial applications.The main contents and conclusions of this study are as follows:(1) Orthogonal experimental are designed to pretreat GA fermentation residue by hot and alkali, the results show that: alkaline thermal pretreatment can effectively improve the hydrolysis effect of GA fermentation residue, SCOD dissolution rate is up to a maximum of 65.26%, and the gas production increase. Among them, the main factors that affecting pretreatment are alkali, pretreatment time and temperature. On the comprehensive consideration of follow-up condition, the pretreat conditions for GA fermentation residue are when it is at 65?, 6% NaOH and 30 min.(2) Static fermentation test is made under mesophilic condition of different mixing ratios to study methane production performance, VS removal rate and stability index of system such as pH, volatile fatty acid, ammonia nitrogen and the variation of alkalinity. The results of this study show that: the improvement of mixing proportion of food waste can effectively improve system capacity and organic matter removal rate, but the stability index of system will be reduced. When the mixed proportion of GA fermentation residue and kitchen waste was 2:1, the maximum gas production rate is 103.2mL/d and organic matter removal rate is 45.2%, and they are increased by 339.14% and 34.12% respectively compared with separate GA fermentation residue.what is more, stability index on catabolic basicity stability is 0.5%, under the comprehensive determine, the mixed proportion of 2:1 is thinked to be the best blending ratio.(3) Anaerobic fermentation dynamic test that was lasting for 158 days at 1g VS/L/d as a starting load has been made by continuous stirred tank reactor(CSTR) equipment at a mixture ratio of 2:1 under 35??45??55?, the test process increase organic load according to the hydraulic residence time, and the experimental results show that: the maximum tolerable load of system can reach 5, 6, and 7gVS/(L·d) respectively. In the stable period of system, the maximum gas production can reach 670mL/d, 720mL/d, 760mL/d, respectively. The high temperature system has the largest daily production capacity, but its stability is poor. In the range of tolerance, increasing organic load can increase the rate of gas production and the removal rate of organic matter. In conclusion, it is the best performance of anaerobic fermentation when the reaction conditions is 35?, 4gVS/(L·d) and 2:1 of mixed ratio. |
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