Research The Passivation Of Cotton Stalk Wood Vinegar On Heavy Metals (Cu, Zn) During Cow Dung Composting Process

In recent years, the rapid development of animal husbandry in Xinjiang, and it is being developed tointensive, large-scale, industry direction. At the same time, along with a large number of livestock excretaproduced. But also a serious threat to the survival of human and animal health, seriously restrict thedevelopment and progress of the society. Therefore, to effectively deal with livestock and poultry wasteand other waste, for the sustainable development of animal husbandry and improvement of ecologicalenvironment has important practical significance. In this paper, the cotton stalk wood vinegar prepared wasapplied to the cow dung compost. Study on the change of content and passivation effect of Cu, Zn duringcow dung compost. For the development of renewable and the practical reference provided a safe andeconomical cow dung compost heavy metal passivation material. The main conclusions were as follows:(1) By preliminary experiments, the amount of heavy metals Cu and Zn was increased after the cowdung compost, the total amount of heavy metals could not be used as the only index of passivation effect.(2) Through single factor experiment, the distribution ratio of the difference of the DTPA extractabledecreased after the cow dung compost, indicating that the compost was helpful about Cu and Znpassivation and passivation effect of processing was significant more than the control group once again,when wood vinegar add a ratio of0.65%, passivation effects of Cu and Zn were maximized, respectively,21.72%and33.11%. Fitting for different treatments showed that Cu passivation regression equationy=-0.4082x3+2.348x2+0.389x+7.609, coefficient of determination was R2=0.959; Similarly, Znpassivation regression equation y=-0.5904x3+3.372x2+1.695x+8.956, coefficient of determination wasR2=0.978; to illustrate that the impact of wood vinegar on passivation of Cu and Zn was highly correlated.(3) Uniform design results showed that when the added ratio of wood vinegar was0.50%, moisturecontent was40%and C/N ratio of40, passivation effect of Cu and Zn reaches a maximum,13.5%and30.2%, respectively. Establish multivariate mathematical model of wood vinegar, water content and C/Nratio conditions, the passivation prediction model of heavy metals Cu wasy Cu=15.4748+0.3524x A0.1100xB+0.0131xC, the passivation prediction model of heavy metals Znwasy Zn=34.3512+11.0905x A0.2561x B0.0531xC, model achieve the required precision.