RETRACTED: Role of Ca-bentonite to improve the humification, enzymatic activities, nutrient transformation and end product quality during sewage sludge composting

Awasthi, Mukesh Kumar; Awasthi, Sanjeev Kumar; Wang, Quan; Awasthi, M. K.; Zhao, Junchao; Chen, Hongyu; Ren, Xiuna; Wang, Meijing; Zhang, Zengqiang

doi:10.1016/j.biortech.2018.04.023

Cited by 40 publications

(15 citation statements)

References 46 publications

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“…Soil quality is governed mainly by the transformation of organic matter, primarily associated with microorganisms and the enzymes they produce as well as the rate of biogeochemical changes in the circulation of elements [ 1 ]. Organic matter is subject to continuous transformations, and its amount and quality depend on the rate of mineralization and humification of organic compounds [ 2 ]. Soil enzymes catalyze the transformations associated with matter and the energy transformations in ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Use of phosphatase and dehydrogenase activities in the assessment of calcium peroxide and citric acid effects in soil contaminated with petrol

Curyło

Telesiński

2020

Open Life Sciences

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AbstractThe objective of the study was to compare the effect of calcium peroxide and citric acid on the activity of acid phosphatase (ACP), alkaline phosphatase (ALP), and dehydrogenases (DHA) in uncontaminated soil and soil contaminated with petrol. The experiment was carried out on samples of loamy sand under laboratory conditions. Petrol was introduced to soil samples at a dose of 0 and 50 g·kg 1 DM, as well as calcium peroxide or citric acid at a dose of 0, 50, 100, or 150 mg·kg 1 DM. The humidity of the samples was brought to 60% maximum water holding capacity, and the samples were incubated at 20°C for 8 weeks. Enzyme activity was determined on days 1, 14, 28, and 56. The obtained results demonstrated that the addition of calcium peroxide and citric acid did not result in significant changes in the activity of the determined enzymes in uncontaminated soil. However, it was observed that the application of calcium peroxide, particularly at the dose of 150 mg·kg 1 DM, largely alleviated the impact of petrol on the enzymatic activity of the soil contaminated with petrol. Moreover, among the determined enzymes, the activity of DHA was found to be the best indicator of the effect of calcium peroxide on the soil ecosystem.

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Section: Introductionmentioning

confidence: 99%

Use of phosphatase and dehydrogenase activities in the assessment of calcium peroxide and citric acid effects in soil contaminated with petrol

Curyło

Telesiński

2020

Open Life Sciences

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“…Dissolved organic carbon and CO 2 emission. DOC mainly includes small molecule, simple structure and water soluble carbon source materials, so it is easily used by microorganisms to participate in the biochemical reaction of composting 35 . The change of DOC in the composting could indirectly reflect the metabolism of compost microorganisms, and DOC had a certain relationship with the degradation of OM and the maturity of the compost product, so DOC could also be used to evaluate the stability of composting product 36 .…”

Section: Resultsmentioning

confidence: 99%

Improving sewage sludge compost process and quality by carbon sources addition

Meng

Zhang

et al. 2021

Sci Rep

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In present study, the effects of carbon sources on compost process and quality were evaluated in the lab-scale sewage sludge (SS) composting. The composting experiments were performed for 32 days in 5 L reactors. The results showed that carbon sources could change the nitrogen conversion and improve the compost quality. Especially, the readily degradable carbon source could promote organic matter degradation, improve nitrogen conversion process and accelerate compost maturation. The addition of glucose and sucrose could increase dissolved organic carbon, CO2 emission, dehydrogenase activity, nitrification and germination index during the SS composting. That's because glucose and sucrose could be quickly used by microbes as energy and carbon source substance to increase activity of microbes and ammonia assimilation. What's more, the NH3 emission was reduced by 26.9% and 32.1% in glucose and sucrose treatments, respectively. Therefore, the addition of readily degradable carbon source could reduce NH3 emission and improve compost maturity in the SS composting.

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“…Although covering or incorporating the mature compost is a chapter method to mitigate the GHG emission, it could increase the NH 3 emission, which could be due to the high temperature or pH thus improving the transformation of NH 4 + -N to NH 3 . The addition of additives such as phosphogypsum, superphosphate, microbial agent, zeolite, biochar, 108,109 dicyandiamide, bentonite, and medical stone could effectively improve the composting process and reduce the potential environmental risk. 14,20,22,37 The addition of chemical additives (e.g.…”

Section: Economic Analysis and Technology Gap Of Cleaner Composting And Mitigation Strategiesmentioning

confidence: 99%

Current status of global warming potential reduction by cleaner composting

Liu

Awasthi

Duan

et al. 2019

Energy & Environment

Self Cite

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The global living standards are currently undergoing a stage of growth; however, such improvement also brings some challenges. Global warming is the greatest threat to all living things and attracts more and more attention on a global scale due to the rapid development of economy. Carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) are the common components of greenhouse gases, which contribute to the global warming. Mitigation technologies for these gas emissions are urgently needed in every industry for the aim of cleaner production. Traditional agriculture also contributes significantly to enhance the greenhouse gases emission. Composting is a novel and economic greenhouse gases mitigation strategy compared to other technologies in terms of the organic waste disposal. Some of the European countries showed an increase of more than 50% in the composting rate. The microbial respiration, nitrification and denitrification processes, and the generation of anaerobic condition makes the emission of greenhouse gases inevitable during composting. However, although there have been a lot of papers that focused on the reduction of greenhouse gases emission in composting, none of these has summarized the methods of reducing the emission of greenhouse gases during the composting. This review discusses the benefit of composting in greenhouse gases mitigation in the organic waste management and the current methods to improve mitigation efficiency during cleaner composting. Key physical, chemical, and biological parameters related to greenhouse gases mitigation strategies were precisely studied to give a deep understanding about the emission of greenhouse gases during cleaner composting. Furthermore, the mechanism of greenhouse gases emission mitigation strategies for cleaner composting based on various external measures would be helpful for the exploration of novel and effective mitigation strategies.

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RETRACTED: Role of Ca-bentonite to improve the humification, enzymatic activities, nutrient transformation and end product quality during sewage sludge composting

Cited by 40 publications

References 46 publications

Use of phosphatase and dehydrogenase activities in the assessment of calcium peroxide and citric acid effects in soil contaminated with petrol

Use of phosphatase and dehydrogenase activities in the assessment of calcium peroxide and citric acid effects in soil contaminated with petrol

Improving sewage sludge compost process and quality by carbon sources addition

Current status of global warming potential reduction by cleaner composting

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