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首页> 外文期刊>Archives of Environmental Contamination and Toxicology >Effects of Composting Process and Fly Ash Amendment on Phytotoxicity of Sewage Sludge
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Effects of Composting Process and Fly Ash Amendment on Phytotoxicity of Sewage Sludge

机译：堆肥工艺和粉煤灰改良剂对污泥植物毒性的影响

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With the increasingly growing global production of sewage sludge, evaluation of its applicability in agriculture and land restoration is essential. This study assessed the potential effects of composting process and fly ash amendment on soil-ameliorating properties of sewage sludge. The metal availability and phytotoxicity of ash-amended sludge compost (AS, mature sewage sludge compost mixed with fresh lagoon ash) and sludge-ash co-compost (SA, co-composted mixture of sewage sludge and lagoon ash) were compared. The results of this work suggested that both composts favored the applicability of sewage sludge for land application by reducing Cd, Cu, Pb, and Zn availability. The SA co-compost stimulated seed germination at ash amendment rates of ≤10%, whereas various treatments of AS compost inhibited germination at an extract dilution of 50%. Amendment of lagoon ash before or after sludge composting increased electrical conductivity (EC) and volatilization of NH4-N, but lowered availability of PO4-P. Together with the results of phytotoxicity, an optimal ash amendment rate of 5% for AS and 10% for SA were most desirable. Alkaline amendment prior to sludge composting was recommended, because it could be more effective in reducing soluble and plant-available metal concentrations through the composting process.
机译：随着全球污水污泥产量的不断增长，对其在农业和土地恢复中的适用性进行评估至关重要。这项研究评估了堆肥工艺和粉煤灰改良剂对污水污泥改良土壤性能的潜在影响。比较了经灰分处理的污泥堆肥（AS，成熟的污水污泥堆肥与新鲜的泻湖灰混合）和污泥-灰混合堆肥（SA，污水污泥和泻湖灰的混合堆肥）的金属有效性和植物毒性。这项工作的结果表明，两种堆肥都通过减少Cd，Cu，Pb和Zn的可利用性，有利于污泥在土地上的适用性。 SA堆肥以灰分修正率≤10％刺激种子发芽，而AS堆肥的各种处理以50％的提取物稀释抑制发芽。污泥堆肥前后对泻湖灰的修正提高了电导率（EC）和NH4 -N的挥发，但降低了PO4 -P的利用率。连同植物毒性的结果，最理想的是，灰分的最佳灰分修正率为AS为5％，SA为10％。建议在污泥堆肥之前进行碱改良剂，因为它可以通过堆肥过程更有效地降低可溶性金属和植物可用金属的浓度。

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    S. S. S. Lau; M. Fang; J. W. C. Wong;

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    Department of Biology Hong Kong Baptist University Kowloon Hong Kong P.R. China;

    The School of Life Sciences and State Key Laboratory of Microbial Technology Shandong University P.R. China;

    Department of Biology Hong Kong Baptist University Kowloon Hong Kong P.R. China;

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