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Effects of biostimulation by sugarcane bagasse and coffee grounds on sewage sludges, focusing agricultural use: Microbial characterization, respirometric assessment and toxicity reduction.
Waste Management ( IF 8.1 ) Pub Date : 2020-09-03 , DOI: 10.1016/j.wasman.2020.08.033
Dânia Elisa Christofoletti Mazzeo 1 , Andrea Misovic 2 , Flávio Andrade Oliveira 3 , Carlos Emílio Levy 3 , Jörg Oehlmann 2 , Mary Rosa Rodrigues de Marchi 1
Affiliation  

Sewage sludge (SS) exhibits a relevant agronomic potential due to the high content of organic matter and nutrients. However, the presence of several toxic substances can prevent its agricultural application. This study evaluated if the incorporation of stimulating agents (coffee grounds and sugarcane bagasse) could contribute to an effective increase of the SS biodegradability in order to decrease its toxicity. The samples were prepared mixing aerobic or anaerobic sludge with soil, soil and bagasse, and soil and coffee grounds. Respirometric tests showed that stimulating agents enhanced the CO2 production. However, in terms of biodegradation efficiency, more satisfactory results were verified for the anaerobic SS, especially when mixed with coffee grounds. The biodegradation also favored the SS sanitization, eliminating the Enterobacteria. For baseline toxicity (Microtox with Aliivibrio fischeri) and phytotoxicity (Lactuca sativa), all the initial samples showed higher effects. Nevertheless, after the biodegradation, this toxicity was significantly decreased and the best results were obtained for the mixtures containing only soil and sludge. For the AREc32 assay (NRF2 mediated oxidative stress response), although a very weak response was observed, this effect was attenuated for the aerobic SS or completely eliminated for the anaerobic SS after the biodegradation. Thus, even though the use of biostimulation agents during the biodegradation led to an enhancement of microbial respiration, their incorporation to the samples do not seem to interfere in the decrease of the toxic potential of the studied SSs. However, the SS biodegradation in aerobiosis was crucial for toxicity reduction and to accelerate its maturity.



中文翻译:

甘蔗渣和咖啡渣对污水污泥的生物刺激作用,主要用于农业用途:微生物表征,呼吸测定和毒性降低。

污水污泥(SS)由于有机物和营养物质的含量高而具有相关的农艺潜力。但是,几种有毒物质的存在会阻止其在农业上的应用。这项研究评估了掺入刺激剂(咖啡渣和甘蔗渣)是否可以有效提高SS的生物降解性,从而降低其毒性。准备好样品后,将好氧或厌氧污泥与土壤,土壤和蔗渣,土壤和咖啡渣混合。呼吸测试显示,刺激剂可增强CO 2生产。但是,就生物降解效率而言,厌氧SS的结果更为令人满意,尤其是与咖啡渣混合时。生物降解也有利于SS消毒,消除了肠杆菌。对于基线毒性(Microtox with Aliivibrio fischeri)和植物毒性(Lactuca sativa),所有初始样品均显示出更高的效果。然而,经过生物降解后,该毒性显着降低,仅含土壤和污泥的混合物获得了最佳结果。用于AREc32分析(NRF 2介导的氧化应激反应),尽管观察到非常弱的反应,但在生物降解后,这种作用对于好氧SS减弱了,对于厌氧SS则完全消除了。因此,即使在生物降解过程中使用生物刺激剂会增强微生物的呼吸作用,但将它们掺入样品中似乎不会干扰所研究SS的毒性潜力的降低。但是,需氧生物中SS的生物降解对于降低毒性和加速其成熟至关重要。

更新日期:2020-09-05
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