The agricultural use potential of the detoxified textile dyeing sludge by integrated Ultrasound/Fenton-like process: A comparative study.
The agricultural use potential of the detoxified textile dyeing sludge by integrated Ultrasound/Fenton-like process: A comparative study.
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DOI：
10.1016/j.ecoenv.2019.01.020
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发表时间：
2019-05
影响因子：
6.8
通讯作者：
Haiyuan Zou;Xun-an Ning;Yi Wang;Fengping Zhou
中科院分区：
文献类型：
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作者：
Haiyuan Zou;Xun-an Ning;Yi Wang;Fengping Zhou
加强工业污泥的无害化处理，对于应对城市发展和日益严格的环保法规具有重要的科学意义和现实意义。超声波（US）与零价铁/EDTA/空气（ZEA）工艺相结合的策略被证明是生态友好的，在我们以前的研究中有效地去除了纺织印染污泥中的有毒化合物。为此，本文首次通过改变印染污泥的理化参数（如pH值、宏量营养素、重金属和持久性有机污染物）和毒性（植物和水生生物），以此评估工业污泥农业用途的适当性。结果表明，超声波处理对污泥理化性质的影响最小，处理后污泥的可生物降解性降低。ZEA处理能有效地氧化降解持久性有机污染物（POPs），使重金属更易浸出，从而在较低的污泥投加量下实现了有效的解毒，但过量的EDTA会对污泥的抗氧化性能产生负面影响。而US和ZEA的结合可以避免这种情况，因为US促进了EDTA和POPs的降解，因此当污泥用量为7.5 tdw/ha（中国最新立法建议的剂量）时，对植物生长的抑制作用最小，甚至明显刺激。水生生物毒性测试进一步证实，US/ZEA处理实现了最显著的毒性降低，导致最轻微的环境破坏。该研究对工业污泥农用化管理具有一定的指导意义。
Enhancing industrial sludge detoxification is of scientific and practical significance in confronting urban development and stringent environmental regulations. A strategy combining ultrasound (US) with the zero-valent iron/EDTA/Air (ZEA) process was proven to be eco-friendly, being efficient in the removal of toxic compounds from textile dyeing sludge in our previous studies. In this paper, therefore, the detoxification effects of three advanced oxidation processes (US, ZEA, US/ZEA) on textile dyeing sludge were comparatively evaluated for the first time through alteration of the sludge's physico-chemical parameters (e.g., macronutrients, heavy metals, and persistent organic pollutants) and toxicity (plants and aquatic biota), by which the appropriateness of industrial sludge's agricultural use was assessed. The results showed that US led to the least alteration of the physico-chemical properties, and the treated sludge became less biodegradable, as demonstrated by XPS. With ZEA treatment, persistent organic pollutants (POPs) were degraded by oxidation, and heavy metals were more leachable, leading to effective detoxification with a relatively low sludge dose, but an excessive amount of EDTA would negatively change the fertilizing properties of the sludge. However, the integration of US and ZEA could avoid this situation, as US promoted the degradation of EDTA and POPs, thus causing the least inhibition or even a noticeable stimulation of plant growth when the sludge dosage was 7.5 tdw/ha (recommended dosage by the latest legislation in China). Aquatic organism toxicity tests further confirmed that US/ZEA treatment realized the most significant toxicity reduction, leading to the slightest environmental disruption. This study could be instructive in providing guidance for industrial sludge management considering agricultural use.