Effects of bulking agents on greenhouse gases and related genes in sludge composting

Wang, Ke; Du, Mengfei; Wang, Zhe; Liu, Huimin; Zhao, Yan; Wu, Chuandong; Tian, Yu

doi:10.1016/j.biortech.2021.126270

Cited by 23 publications

(3 citation statements)

References 47 publications

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“…Sample 1 also had a high density, close to the density of the biowaste, which gave it a low capacity as a BA considering the volumes treated in the CCC. Samples 2 and 3 had very similar particle size percentages, with the 1–2 cm fraction being the most abundant and with densities similar to those found by other authors (Wang et al 2022 ). The sum of the 0.5–1 cm and 1–2 cm fractions accounted for more than 50% by weight in samples 2, 3 and 4.…”

Section: Resultssupporting

confidence: 86%

Community composting strategies for biowaste treatment: methodology, bulking agent and compost quality

Alves

Villar

Mato

2023

Environ Sci Pollut Res

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The European Union’s commitment to increase recycling and recovery rates of municipal solid waste requires significant changes in current waste management. Local governments are developing various strategies for treating the organic fraction of municipal waste (biowaste) via composting. Community composting centres (CCC), green waste collection, treatment points and community gardens are some of these new approaches. Population density and spatial distribution, together with the existence of community green areas, determine the location of the various infrastructures for recycling local biowaste. The composting process consumes high amounts of bulking agent (BA) necessary to provide the structure that allows, amongst other uses, biowaste aeration and microbial surface colonisation. Shredded green waste from parks, gardens and households can be used as BA in community composting and home composting. In this study, a total of 46 compost samples obtained from CCC with two types of handling were analysed: 22 samples treated by vertical flow (VF) and 24 samples treated by horizontal flow (HF). The HF model allowed better use of the volume of modular composting units and the VF model required less effort and time for the CCC operator. Mature, stable and high-nutrient-content composts were obtained with both models. These composts met the legal requirements to be used as an organic amendment, and they can be delivered to the participants or used in community gardens in the municipality.

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Section: Resultssupporting

confidence: 86%

Community composting strategies for biowaste treatment: methodology, bulking agent and compost quality

Alves

Villar

Mato

2023

Environ Sci Pollut Res

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“…Meanwhile, the ORP values of all three piles decreased first and then increased as the biochemical reaction process occurred, which is consistent with previous literature [32]. The higher levels of ORP in the BS and the FS piles indicated that the high oxygen diffusion in the composting matrix of the BS pile and the PS pile may increase oxygen consumption [33].…”

Section: Basic Physical and Chemical Indicators During Compostingsupporting

confidence: 90%

Biolysed Sludge Composting for Nitrogen Conservation and Humification Improvements and Mechanisms

Wang

Chen

et al. 2023

Sustainability

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Aerobic composting of conventional municipal sludge has always had the problems of nitrogen loss and low humification. In this study, biolysed sludge (BS), polyacrylamids-added sludge (PS) and Fe (III)/CaO-added sludge (FS) were used for composting, respectively, and their effect on the physical-chemical parameters, nitrogen conversion and humification during composting were investigated. The results showed that the dissolved organic matter (DOM) concentration of the BS pile (23.1 ± 0.4 g/kg) was 48.4% and 48.4% higher than the PS (15.5 ± 0.4 g/kg) and FS piles (15.5 ± 0.0 g/kg) in the initial stage of composting and became the lowest after composting, suggesting that the degradation of DOM was promoted in the BS pile. BS can also increase the retention rate of total nitrogen (TN) (27.8% ± 0.8%), higher than that in PS (22.7% ± 1.1%) and FS (24.6% ± 0.5%), which may be due to the lower production of ammonia nitrogen in the BS pile. Compared with PS and FS, BS provided more humic substance (HS) and humic acid (HA) for composting and the HA contents of the compost products were 34.4 ± 1.0, 35.4 ± 0.2 and 34.0 ± 0.3 mg/g in the PS, BS and FS treated piles, respectively. Fourier transform infrared and the excitation-emission matrix revealed that BS and FS promoted the aromaticity and stability of HA. The degree of polymerization (DP) of the products from the BS (1.48) and FS piles (1.56) was higher than that of the PS pile (1.36). However, the germination index (GI) value (133.4% ± 6.0%) of FS was lower than that of PS (152.3% ± 6.2%) and BS (158.3% ± 0.8%), showing that the products of FS composting contain more plant biotoxicity. Thus, compared with PS and FS, BS can increase the nitrogen retention rate and the maturity of the compost.

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“…However, malodorous pollutants, such as gaseous ammonia (NH3) and volatile organic compounds (VOCs), are considered to be a key problem restricting the development of sludge bio-drying (Maulini-Duran et al 2013;Duan et al 2022). An effective technology to remove colorless, corrosive, and harmful gas is thus necessary to protect human health from the serious pungent smell (González et al 2019;Wang et al 2022a).…”

Section: Introductionmentioning

confidence: 99%

Competitive interactions of NH3 and toluene with biochar modified by pre- and post-treatments of H3PO4 in dual adsorption systems

Huang

et al. 2023

BioRes

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Biochar modified by H3PO4 treatment can be used to purify malodorous gases during bio-drying of sludge, but the current understanding of multi-component adsorption of malodorous gases through biochar is limited. This study examined the adsorption mechanism of mixed malodorous gases including toluene and ammonia (NH3) on two kinds of biochar modified via H3PO4 pretreatment before and after pyrolysis. The biochar obtained by H3PO4 pretreatment of biomass before pyrolysis (C550) preferred to adsorb NH3 whether in the single or the dual system. In contrast, the biochar obtained by H3PO4 reprocessing after pyrolysis of biomass (C350-550) tended to adsorb toluene in the dual system but was more efficient in absorbing NH3 in the single system. The pseudo-second-order kinetic model indicated the synergistic adsorption between NH3 and toluene for all biochar samples. In-situ DRIFTS of C350-550 during adsorption demonstrated the formation of amino functional groups caused by NH3 chemical adsorption with -OH (or -COOH) in the dual system. These increases in basic groups on C350-550 could enhance the surface zero potential point of C350-550, thereby improving the non-polarity of C350-550 and benefit the adsorption of weak polar toluene.

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Effects of bulking agents on greenhouse gases and related genes in sludge composting

Cited by 23 publications

References 47 publications

Community composting strategies for biowaste treatment: methodology, bulking agent and compost quality

Community composting strategies for biowaste treatment: methodology, bulking agent and compost quality

Biolysed Sludge Composting for Nitrogen Conservation and Humification Improvements and Mechanisms

Competitive interactions of NH3 and toluene with biochar modified by pre- and post-treatments of H3PO4 in dual adsorption systems

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