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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >A Review and Assessment of Emerging Technologies for the Minimization of Excess Sludge Production in Wastewater Treatment Plants
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A Review and Assessment of Emerging Technologies for the Minimization of Excess Sludge Production in Wastewater Treatment Plants

机译：减少废水处理厂中过量污泥产生的新兴技术的回顾和评估

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摘要

This paper focuses on the most promising technologies, available for full-scale applications, aimed to the on-site reduction of the excess sludge produced in municipal wastewater treatment plants. New techniques are added to the conventional stages of wastewater treatment, both integrated in the activated sludge bioreactors or applied as pretreatment for the enhancement of anaerobic digestion. A concise review about the alternatives based on physical, chemical or biological mechanisms is described. The present work highlights the efficiency of two such techniques, sonolysis and alkaline thermolysis integrated on the return flow from the secondary settler into the activated sludge bioreactors. The investigation on the effect of sonolysis and alkaline thermolysis on activated sludge samples was carried out by evaluating the COD concentration released in soluble and colloidal form and biodegradability measured by respirometry. The physicochemical treatments of sludge have several advantages (easy management, stability in performances and flexibility), but are associated with high operational costs that often limit the wide-scale applications. The application of hybrid methods, that couple almost two techniques for the enhancement of efficiency with respect to a single one, could optimise the sludge reduction, giving a significant saving in energy consumption for large-scale operations, but further research is needed.
机译：本文重点介绍可用于大规模应用的最有希望的技术，旨在现场减少市政废水处理厂产生的过量污泥。新技术被添加到废水处理的常规阶段，既可以集成到活性污泥生物反应器中，也可以作为预处理来增强厌氧消化。简要概述了基于物理，化学或生物学机制的替代方案。本工作着重介绍了从次级沉降器到活性污泥生物反应器的回流中集成的超声分解法和碱热分解法这两种技术的效率。通过评估以可溶性和胶体形式释放的COD浓度以及通过呼吸测定法测定的生物降解性，研究了超声波分解和碱性热分解对活性污泥样品的影响。污泥的物理化学处理具有多个优点（易于管理，性能稳定和灵活性），但伴随着高昂的运营成本，这常常限制了大规模应用。混合方法的应用（结合了将近两种技术来提高效率）相对于单一方法而言，可以优化污泥的减少，从而为大规模运营节省大量能源，但是还需要进一步的研究。

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