The Research On Fast Aerobic Composting With Blue Algae

With the rapid development of China's economy, the eutrophication have taken a rapid bad turn. The eutrophication has become a serious environmental problem to chinese water body. If the blue algae salvaged will not be properly handled, would cause serious secondary pollution.Aerobic composting is an effecient approach to treat blue algae for its recyeling, reduction and harmless. However, the research about aerobic composting of blue algae was rather few. In this study, the most suitable bulking agent for aerobic composting was determined firstly. Then, co-composting of blue algae and bran experiments were carried out to study the chnages of pH, moisture content, solid phasee C/N, water soluble NH4+-N, water soluble NO3--N, T value, seed gemrination index(Gl) and the evaluation index of maturity during composting. The effects of compound microbial inoculant and compost reused on substance change and composting maturity were also studied. The results obtained were as fllowing:(1) When the compost finished, for the treatment with the bran as bulking agents, TC decreased by 90.43 g/kg, TN increased by 1.85 g/kg, C/N reduced to 13.46, GI elevated to 73.98%. All of that indicated that bran is more effective bulking agent. For the treatment with rice husk as bulking agents, TC decreased less than the other, TN lossed most seriously. That indicated rice husk is the worst bluking agent. Degradation rate of MLCs were more than 95.7 percent, so the compost product can be used in garden,woodland and so on.(2) During the composting process, the color of material turned light black from green; the odor disappeared gradually; the water content, C/N, T-value decreased to 38.34%, 16.74, 0.57 gradually, all of that have reached required standard; pH value appeared to have a rising trend after an initial descent, remained steadily finally; TC decreased continuously; DOC increased after the first drop; NH4+-N content reduced after an initial increase, and NO3--N content increased, NH4+-N/NO3--N reduced after the initial increase, reached 0.20 finally; GI increased to 90.17% after an initial descent; Correlation analysis showed that T-value, water content as well as NH4+-N/NO3--N was negative signifieantly to Gl. T-value, water content as well as NH4+-N/NO3--N could be used as biological and chemical indices of compost maturity.(3) The effects of compound microbial inoculant and compost reused were studied. During the composting peocess, The pH of treatment D4 changed most obviously; water content of four treatments decreased; C/N of treatment D2, D4 decreased more obviously than treatment D1, D3, T-value of treatment D2, D3, D4 have been less than 0.60; For four treatments, NH4+-N value decent after an initial ascent, NO3--N increased finally; NH4+-N/NO3--N of treatment D4 has been less than 0.2; GI of four treatments increased after a drop, GI of treatments D2, D1, D3, D4 reached 81.28%, 96.79%, 95.27%, 102.95% respectively. All of that showed that the addition of microbial agents and compost reused promoted aerobic composting most remarkably, the addition of microbial agents take second place, the addition of compost reused was aslo effective, but it was less effective than the other.