State Key Laboratory of Agricultural Microbiology, National Engineering Research Centre of Microbial Pesticides, College of Life Science and Technology, Huazhong Agricultural University, No.1 Shizishan Street, Hongshan District, Wuhan, 430070, Hubei Province, People's Republic of China.
Environ Sci Pollut Res Int. 2018 Jan;25(2):1559-1567. doi: 10.1007/s11356-017-0541-x. Epub 2017 Nov 2.
Treating municipal sewage sludge (MSS) sustainably and economically in China remains a challenge because of risks associated with the heavy metals it contains. In this study, black solider fly larvae (BSFL) were used for MSS treatment. The resistance of larvae to combined heavy metals and their potential use in conversion of MSS were investigated. The results indicated that seven MSS samples contained large amounts of heavy metals, with the lead and nickel contents of several samples exceeding Chinese national discharge standards. BSFL were highly tolerant to an artificial diet spiked with combined heavy metals. Principal component analysis revealed that high concentrations of lead, nickel, boron, and mercury potentially interfered with larval weight gain, while zinc, copper, chromium, cadmium, and mercury slightly reduced larval survival. The addition of chicken manure and wheat bran as co-substrates improved the conversion process, which was influenced by the nature and amount of added co-substrate and especially the quantity of nitrogen added. With the amended substrate, the BSFL accumulated heavy metals into their bodies but not into extracted larval oil. The heavy metal content of the treatment residue was lower than that considered safe for organic-inorganic compound fertilizers standards in China and the harvested larvae could be used as a source of oil for industrial application.
在中国，由于市政污泥 (MSS) 中所含重金属带来的风险，实现其可持续且经济的处理仍然是一项挑战。在本研究中，利用黑水虻幼虫来处理 MSS。研究了幼虫对复合重金属的抗性及其在 MSS 转化中的潜在应用。结果表明，七个 MSS 样品中含有大量重金属，其中几个样品的铅和镍含量超过了中国国家排放标准。黑水虻幼虫对添加了复合重金属的人工饲料具有很强的耐受性。主成分分析表明，高浓度的铅、镍、硼和汞可能会干扰幼虫体重的增加，而锌、铜、铬、镉和汞则会轻微降低幼虫的存活率。添加鸡粪和麦麸作为共底物改善了转化过程，该过程受添加共底物的性质和数量以及添加的氮量的影响。使用改良的基质，黑水虻将重金属积累到体内，而不是积累到提取的幼虫油中。处理残渣中的重金属含量低于中国有机-无机复混肥标准中认为安全的水平，并且收获的幼虫可以作为工业应用的油源。
