Effects of pH and microbial composition on odour in food waste composting

Sundberg, Cecilia; Yu, Dan; Franke‐Whittle, Ingrid H.; Kauppi, Sari; Smårs, Sven; Insam, Heribert; Romantschuk, Martin; Jönsson, Håkan

doi:10.1016/j.wasman.2012.09.017

Cited by 170 publications

(67 citation statements)

References 28 publications

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“…The W1 presented acid pH and it is in accordance with Kumar et al (2010) and Sundberg (2013), who characterized food waste and verified pH values ranging from 3.8 to 6.5. The remaining residues resulted in pH close to neutral.…”

Section: Resultssupporting

confidence: 84%

<b>Treatment of organic solid waste generated at agricultural research corporation via composting under natural and controlled conditions

et al. 2018

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ABSTRACT. The study of composting technique becomes relevant to management of organic waste generated in an undertaking agricultural research. Therefore, this paper aimed to evaluate the efficiency of stabilization of organic matter in two composting systems: controlled (plowings and irrigations fortnightly) and natural. It has been tested two piles (controlled and natural) during 120 days in four treatments: soy straw (T1), wheat straw (T2), tree pruning (T3), mixture of soy and wheat straw and tree pruning (T4) with organic residues from the recycling program + soybeans. There was monitoring of temperature, moisture, pH, electrical conductivity (EC), C, N, C/N ratio and reduction of mass and volume. In the controlled treatments, the thermophilic phase was lower, the moisture was in the ideal ratio for the process (with lower values in the natural treatments), and there was a decrease of 3-4 times of the values of EC and the higher reductions of mass and volume. In all treatments, the values of pH were neutral and the C/N ratio declined 37-50%, assuming final values of matured composts. It has been concluded that regardless of mixtures of waste, the controlled treatments, in the period of 120 days, were more efficient in stabilize the organic material.Keywords: organic residues from the recycling program, soybeans, wheat straw, soybean straw, pruning trees.Tratamento de resíduos sólidos orgânicos gerados em instituto de pesquisa agropecuária via compostagem em condições natural e controlada RESUMO. O estudo da técnica de compostagem se torna relevante para gestão dos resíduos orgânicos gerados em um empreendimento de pesquisa agropecuária. Sendo assim, este trabalho objetivou avaliar a eficiência da estabilização da matéria orgânica em dois sistemas de compostagem: controlado (revolvimentos e irrigação quinzenalmente) e natural. Foram testadas duas leiras (controlada e natural) durante 120 dias em quatro tratamentos: palha de soja (T1), palha de trigo (T2), poda de árvore (T3) mistura de palhas de soja e trigo com poda de árvore (T4) com resíduos orgânicos da coleta seletiva + grãos de soja. Monitorou-se temperatura, umidade, pH, condutividade elétrica (CE), C, N, relação C/N e redução de massa e volume. Nos tratamentos controlados a fase termófila foi menor, a umidade esteve na faixa ideal para o processo (valores abaixo nos naturais), houve diminuição de três a quatro vezes dos valores de CE e as maiores reduções de massa e volume. Em todos os tratamentos os valores de pH foram neutros e houve redução de 37 a 50% da relação C/N, assumindo valores finais de compostos maturados. Conclui-se que, independente da mistura de resíduos, os tratamentos controlados no período de 120 dias, foram mais eficientes em estabilizar a matéria orgânica.Palavras-chave: resíduos orgânicos da coleta seletiva, grãos de soja, palha de trigo, palha de soja, poda de árvores.

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Section: Resultssupporting

confidence: 84%

<b>Treatment of organic solid waste generated at agricultural research corporation via composting under natural and controlled conditions

et al. 2018

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“…Like these factors moisture impacts also on the physico-chemical properties [temperature, free air space (FAS), particle size, pH, C/N] of waste material to decompose during composting process (Kulcu and Yaldiz 2004). Several researchers also reported that optimum moisture content (55-60 %), C/N ratio (25)(26)(27)(28)(29)(30) and pH are the important factors for stabilization and maturation of compost (Sundberg et al 2013;Kumar et al 2010). Bulking agents are the fibrous with carbonaceous material, provide FAS and regulate water contents of waste to be composted because they modify the properties of waste during composting, due to high moisture, low C/N ratio and high density of waste.…”

Section: Introductionmentioning

confidence: 99%

Optimization of process parameters for kitchen waste composting by response surface methodology

Iqbal

Nadeem

Sherazi

et al. 2014

Int. J. Environ. Sci. Technol.

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The optimization of process parameters for decomposition of kitchen waste into mature, stable compost was investigated using response surface methodology (RSM). RSM and central composite designs were applied to evaluate and optimize the key factors namely fly ash, bulking agent for moisture optimization and temperature, inoculum size and lime concentration for C/N optimization, which affect the stability of compost. Moisture and C/N ratio were selected as response variables. The experimental data of response variables were fitted into quadratic polynomial model using the multiple regression analysis and found it was statistically significant quadratic model. Box-Behnken design under RSM was used to optimize their interaction between bulking agent (40 %) and fly ash (15 %) has significant effect on moisture optimization and temperature (35°C), lime (3 %), and inoculum size (10 %) were the best for C/N ratio optimization and compost maturity. These optimized conditions were used and recorded the 50 % moisture reduction, and 8.43 C/N was achieved; indicates the stable and mature compost in minimum time. A significant correlation was also found between C/N ratio, humic acid, fulvic acid and degree of polymerization during compost formation. It was fleetingly concluded that optimization of compost parameters promote the decomposition rate and humification process.

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“…Recent studies have proof that emission of odors from values of pH (21) The optimum pH of potting media would be different for different plants, but usually the desirable range was between 5.0 and 6.5 (22). This pH range of 5.1 to 6.0 was seen in the optimum range for growing media (23) who stated that the optimal range is from 5.2 to 7.3.…”

Section: Hydrogen Ion Level (Ph)mentioning

confidence: 99%

“…Early dehydration during composting usually comes from extreme low values of MC where it will stop the biological process, thus giving physically stable but biologically unstable composts (24). Several researchers also reported that optimum MC (55-60 %), C/N ratio (25)(26)(27)(28)(29)(30) and pH are the important factors for stabilization (25) and maturation of compost (21). Recent studies have shown that the municipal solid wastes generated in Malaysia contained a high percentage of organics (45-60%) with a MC of about 55% (26).…”

Section: Moisture Content (Mc) and Relative Humiditymentioning

confidence: 99%

The Discovery of Physical Properties of Food Waste in Composting Process

Firdaus¹,

Samah²,

Hamid³

et al. 2018

IJET

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Composting as a method of solid waste management should be given attention. It gives means of producing a valuable end product, by treating of organic wastes in an environmentally friendly method which does not release any hazardous chemical which can affect human health without causing a major disruption to the surrounding ecosystem. Nevertheless, the issue of time-consuming arises and this correspond to the sink of market demand. The optimized pre-composting process was done through drying, grinding and controlled aeration resulted in the fast-compost formation and cost-effective. This study aimed to discover the physical properties of food waste in composting process. The controlled parameter of the composting which is aeration time where pre-composting processes applied was drying and grinding. The manipulated parameter of composting process happened within two durations: rotation and rest. Each container has been rotated for 15 minutes yet different resting time was applied which are 15, 25, 50, 150 minutes namely A, B, C and D. The data collection has been done in hourly basis for the total of 72 hours. Based on the statistical analysis, results show that mass reduction of samples (A=38.6%, B=32.6%, C=24.6%, D=22.6%). The compost temperature ranged between (23°C -39°C) while the compost pH was (5.12 -5.85). Peak level of surrounding temperature was (35.7°C) while surrounding relative humidity (53%) in normal condition. Among the highest moisture content was (52.63%) while the lowest discovered in sample D (24.81%) respectively. Results show that with the longer the aeration time, the better physical properties of compost formed. The obtained data will provide evidence on its significances application to the agencies, the public and the industrial player to cope up with this major environmental threat. This study found a significant relationship between physical factors and compost formation which contribute to better analysis, especially to food waste management.

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Effects of pH and microbial composition on odour in food waste composting

Abstract: Highlights► High odour emission from food waste compost was correlated to low pH. ► Microbes in high-odour samples included Lactic acid bacteria and Clostridia. ► For odour prevention, try high initial aeration rate and recycled compost as additive.

Cited by 170 publications

References 28 publications

<b>Treatment of organic solid waste generated at agricultural research corporation via composting under natural and controlled conditions

<b>Treatment of organic solid waste generated at agricultural research corporation via composting under natural and controlled conditions

Optimization of process parameters for kitchen waste composting by response surface methodology

The Discovery of Physical Properties of Food Waste in Composting Process

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