响应曲面法优化沼渣混合物料堆肥配比研究

基于主成分分析,以WSC/WSN、E4/E6、NH4＋-N/NO3－-N、GI作为混合堆肥腐熟程度的判别指标体系,建立综合评价函数,确定综合评价值F,用于表征混合堆肥腐熟度.采用Box-Behnken设计,以F值为响应值,沼渣量、猪粪量、鸡粪量为3因素,设计了15组堆肥试验,建立二次多项数学模型,从腐熟度的角度确定沼渣、猪粪、鸡粪混合堆肥的最佳配比.结果表明:沼渣量、猪粪量、鸡粪量对响应值F影响的显著性顺序为:鸡粪量>沼渣量>猪粪量;鸡粪量一次项、沼渣量二次项达到极显著水平(P<0.01);沼渣量和鸡粪量的交互项、鸡粪量二次项达到显著水平(P<0.05);优化出的混合物料堆肥沼渣、猪粪、鸡粪最佳质量配比为5.83:7.95:7.54.由此可见,响应曲面法用于混合堆肥物料配比优化具有可行性.

Optimization of biogas residue mixed with livestock manure co-composting using response surface methodology

According to principal components analysis,a comprehensive evaluation function was built with WSC/WSN,E4/E6,NH4+-N/NO3--N,GI,and the comprehensive evaluation value F used for the assessment of co-compost maturity was obtained on the basis of this evaluation function.In order to get the optimal proportion of biogas residue mixed with livestock manure co-composting,choosing F value as the response value and amount of biogas residue,pig manure,and chicken manure as the three factors,fifteen composting experiments were designed using Box-Behnken,and a second order polynomial equation was established.The results showed,the significant differences between the response value F and livestock manure amount was as follows: chicken manure﹥biogas residue﹥pig manure.Linear term of chicken manure amount and quadratic term of anaerobic digestion residue amount both reached extremely significant level(P<0.01).Interaction term of biogas residue amount,chicken manure amount and quadratic term of chicken manure amount reached significant level(P<0.05).The optimized proportion of co-compost was: the biogas residue amount 5.83kg,the pig manure amount 7.95kg,and the chicken manure amount 7.54kg.Therefore,it is reasonable that response surface method was used for optimization of material proportion of co-compost.