Exploring the regulatory role of wood vinegar on heavy metals (Copper, Zinc) before and after cow dung composting

Abstract

In recent years, livestock manure pollution problems have become increasingly prominent phenomenon. It has brought enormous environmental pressure to our country and also provided the technical support for effective cow dung composting and high-fiber waste treatment. The experiment adopts the biomass wood vinegar as cow dung compost additives to study before and after the changes of heavy metal as Copper and Zinc. A total of six treatments, respectively, 0.20, 0.35, 0.50, 0.65, 0.80% of wood vinegar and control group. Marked them as Tl, T2, T3, T4, T5 and CK. The passivation effect of Copper was T5> CK> T4> T3> Tl> T2 and the best passivation effect of Copper was to add 0.80% wood vinegar, the value was 18.78%. The passivation effect of Zinc was T2> T5> T4>T1>T3> CK and the best passivation effect of Zinc was to add 0.35% wood vinegar which was 8.25%. The passivation effect of Copper and Zinc appeared on fluctuations before and after the composting process. Meanwhile, in order to further study, to prevent "Concentrated effect", "Chelation", "Dilutioneffect" and environmental change common giveriseto fluctuations further occurrence during the composting process. Ensure the stability of the passivation effects, minimizing interference, trying to increase the volume of compost, expanding treatment of wood vinegar gradient and extending the composting period. To prevent the secondary factor was greater than the passivation effect of wood vinegar treatment composting. It could achieve healthy and sustainable development of agriculture and environment.