Directional pyrolysis of sludge to prepare sludge-based biochar with soil improvement function
With the rapid growth of global sludge production,how to recycle it into resource is an urgent realistic problem.Compared with traditional direct landfill disposal and incineration,pyrolysis of sewage sludge is a superior disposal method not only because it can realize the harmlessness and reduction of sludge,but also can generate sludge biochar,which has potential value for soil improvement.In this paper,the effects of different pyrolysis methods on sludge properties and soil improvement effects were comprehensively reviewed.The migration and transformation mechanisms of phosphorus and heavy metals in pyrolysis of sewage sludge,the effects of sewage sludge biochar on soil characteristics,the remediation mechanisms of sewage sludge biochar on heavy metal and organic contaminated soil,and the effects of sewage sludge biochar on soil microorganisms and microbial enzymes were mainly introduced.Through the above analysis,this can be used as a theoretical support to guide the preparation of sludge-based biochar with the function of directional soil improvement.This review will contribute to the further studies of tailored pyrolysis of sewage sludge,and provide theoretical reference and support for using sewage sludge biochar in soil improvement.
sewage sludge biocharphosphorus enrichmentheavy metal solidificationsoil improvement
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