In order to solve the problem of resource utilization of brewing biogas residue,the biochar prepared by brewing biogas residue was added into garden soil.A batch incubation and absorption experiments were carried out with the amended soils to study the improvement of biochar addition on adsorption availability and soil physicochemical properties.Results show that:the high calcium biochar prepared by oxygen limited pyrolysis method at 700℃for 1.5 h behaved best with initial pH 10,the removal rates of COD,NH4+-N and TP in actual wastewater by adding 10 g·L-1 biogas biochar can reach 45.29%,56.10%and 86.33%,respectively.Langmuir isothermal model and pseudo-first-order kinetic equation were more consistent with its adsorption characteristics,indicating the physical adsorption were the main adsorption modes.The contents of C,N,P and O elements on the biochar surface increased significantly with new N-H and P=O groups generated after the adsorption.The available phosphorus,available potassium and organic matter in soil were significantly increased with 5%of adsorbed biochar added which could promote the growth of Chinese cabbage well.This study explored a'one treatment but two uses'approach,which provides an application prospect for the disposal and resource recovery of biogas residue.
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