Improving sewage sludge composting by addition of spent mushroom substrate and sucrose

Meng, Liqiang; Zhang, Shumei; Gong, Hainan; Zhang, Xiancheng; Wu, Chuandong; Li, Weiguang

doi:10.1016/j.biortech.2018.01.015

Cited by 82 publications

(33 citation statements)

References 39 publications

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“…At the initial stage, the minimum air-flow was selected to obtain a temperature of about 70 • C and a sufficiently long thermophilic phase that ensured proper composting. The minimum air-flow was about 2.0 dm 3 •min −1 , at an average air-flow of 2.5 dm 3 •min −1 , which corresponded to a flow in the range of 0.17 dm 3…”

Section: Description Of the Experimentsmentioning

confidence: 95%

“…The rapid development of urbanization and industrialization all over the world, including Europe, has significantly increased the amount of sewage [1][2][3]. Large amounts of sludge are generated in various biological, chemical, and physical wastewater treatment processes and its volume is constantly growing.…”

Section: Introductionmentioning

confidence: 99%

“…While there are numerous publications on obtaining good quality compost and several process optimization studies have already been undertaken [47], there is still a need for research studies concerning the environmental impact of composting, especially regarding gases [44]. Therefore, in order to increase economic efficiency, maize straw was selected as a structural material, because it is a commonly available and cheap material (in Poland, it is about 12 Euro•Mg −1 ), while a relatively low air-flow, at about 2 dm 3 •min −1 , was applied while nonetheless ensuring the correct course of composting processes. Tests carried out on several dozen kilogram samples regarding composting under controlled conditions at low airflows were carried out in very few works [48].…”

Section: Introductionmentioning

confidence: 99%

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Heat Energy and Gas Emissions during Composting of Sewage Sludge

et al. 2019

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The composting of sewage sludge and maize straw mixtures was investigated in this study. The aim was to analyze the influence of different proportions of sewage sludge and maize straw in the mixtures on composting process dynamics (expressed by heat production) and gas emissions. The results showed that all examined mixtures reached a strong thermophilic phase of composting; however, the lowest dynamic of temperature growth was observed in the case of the biggest sewage sludge content (60% of sewage sludge in the composting mixture). The ammonia concentration inside bioreactor chambers was directly related to the content of sewage sludge in the composted mixture. Excessive contents of sewage sludge had a considerable effect on very low C/N ratios and high losses through ammonia emissions. Tests were carried out in reactors with a capacity of 160 dm3 under controlled conditions. All mixtures were aerated by the average air-flow of about 2.5 dm3∙min−1, i.e., the minimum air-flow that allows a temperature of about 70 °C to be reached and a sufficiently long thermophilic phase, which ensures proper composting.

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Section: Description Of the Experimentsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heat Energy and Gas Emissions during Composting of Sewage Sludge

et al. 2019

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“…mycoremediation) to remove emerging contaminants from wastewater such as acetaminophen (C 8 H 9 NO 2 ) . In addition, spent mushroom substrate was found to show the ability to increase the degradation rate of organic matter and promote the composting process …”

Section: Introductionmentioning

confidence: 99%

“…6 In addition, spent mushroom substrate was found to show the ability to increase the degradation rate of organic matter and promote the composting process. 7 Microwave vacuum pyrolysis (MVP) is a pyrolysis technique using microwave irradiation 8 as heat source to heat and pyrolyze biomass under an oxygen-free environment created by a vacuum pump. [9][10][11] Biomass is thermally decomposed to produce three main products, comprising liquid biofuel that can be used to generate power in turbines or diesel engines, 12 biogas as fuel in fuel cells and solid biochar for nutrients adsorption in soil or dye adsorption.…”

Section: Introductionmentioning

confidence: 99%

Microwave vacuum pyrolysis conversion of waste mushroom substrate into biochar for use as growth medium in mushroom cultivation

Lam

Lee

Nam

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Spent mushroom substrate (SMS), largely produced as an agriculture waste from mushroom cultivation, was transformed into biochar via microwave vacuum pyrolysis under different ratios of SMS to microwave absorbent (1:1, 1:2, and 1:3). The biochar was then examined for its potential to be re‐used in mushroom cultivation as a growth medium added to conventional mushroom baglog (plastic bag with mushroom seeds and culture substrates containing rice straw, sawdust, lime and water), with emphasis on its ability to form mycelium – a fungus that grows into mushroom from its seeds. RESULT The pyrolysis generated up to 36 wt% biochar yield with a large adsorption area (up to 215 m2 g‐1) and less water (4 wt%), indicating that many adsorption sites are available on which mushroom seeds, nutrient and water can be adsorbed onto in order to form mycelium (and subsequently mushroom). The biochar added to grow mushroom in baglog recorded a higher water retention percentage (up to 59%), a higher mycelium colonization length in 8 days (6.3 cm), coverage area (up to 259 cm2) and total mycelium growth volume (317 cm3), and resulted in a higher yield of mushroom (200 g month‐1) than that recorded for the conventional baglog without biochar (160 g month‐1). CONCLUSION The results indicated that biochar produced from SMS using microwave vacuum pyrolysis shows great potential in retaining water and nutrient that in turn promotes the formation of mycelium that leads to increased growth of mushroom in its cultivation. © 2018 Society of Chemical Industry

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