RETRACTED: Changes in global trends in food waste composting: Research challenges and opportunities

Awasthi, Sanjeev Kumar; Sarsaiya, Surendra; Awasthi, Mukesh Kumar; Liu, Tao; Zhao, Junchao; Kumar, Sunil; Zhang, Zengqiang

doi:10.1016/j.biortech.2019.122555

Cited by 216 publications

(90 citation statements)

References 111 publications

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“…It is an effective strategy to divert solid waste (SW) from landfills and improve the heating value of feedstock in case of energy recovery (Carabassa et al 2020). Previous studies confirmed that composting reduces the volume of organic materials by more than 30% (Awasthi et al 2020) and converts waste into a hygienic and valuable product ( Chaher et al 2020b;ChenYu et al 2018).…”

Section: Introductionmentioning

confidence: 99%

From anaerobic to aerobic treatment: upcycling of digestate as a moisturizing agent for in-vessel composting process

Chaher

Hemidat

Chakchouk

et al. 2020

Bioresour. Bioprocess.

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In Tunisia, there are crucial challenges facing both urban and rural areas, the most prominent of which are the production of organic waste, the need for waste treatment, the demand for water and energy and the need for a circular economy. To this end, the study was designed to develop a technical concept on closed cycle ‘biowaste to bioenergy’ treating, basically food waste (FW) through combined biological processes. In this approach, the generated digestate from FW anaerobic reactors was used successfully as a moisturizing agent for FW in-vessel composting. Four types of digestate were examined to be used as moisturizing agent (MA). The selection of the appropriate MA was achieved based on technical criteria; moisture content (MC), C:N ratio and heavy metals concentrations. The findings showed that the digestate obtained from anaerobic co-digestion of food waste and wheat straw (D1) was the most efficient AD-effluent to be added. In terms of composting process performance, the thermophilic phase of the amended reactor (A1) lasted 16 days and reached higher temperatures of about 72 °C, while the unamended one (A1) was characterized by a thermophilic temperature of around 66 °C indicating that the end products were of a pathogen-free compost. When it comes to the physico-chemical factors examined demonstrating that the biological conditions were sufficiently developed. The findings showed overall decreasing profiles during the composting period for moisture, C:N ratio as well as nitrification index (NI). From the quality-point of view, it was found that heavy metal concentrations had lower limits than those values set by German standards. Moreover, all the compost samples appeared to be stable and classified as class IV and V end product.

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Section: Introductionmentioning

confidence: 99%

From anaerobic to aerobic treatment: upcycling of digestate as a moisturizing agent for in-vessel composting process

Chaher

Hemidat

Chakchouk

et al. 2020

Bioresour. Bioprocess.

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“…Approximately 1300 Mt a –1 of food waste is generated worldwide [64] with P content in DM ranging from 4.5 to 13.5 g kg –1 [65]. P from organic food waste is frequently made available via composting or anaerobic digestion on full‐scale.…”

Section: P In Food and Food Processing Wastesmentioning

confidence: 99%

New developments in biological phosphorus accessibility and recovery approaches from soil and waste streams

Vučić

Müller

2021

Engineering in Life Sciences

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Phosphorus (P) is a non‐renewable resource and is on the European Union's list of critical raw materials. It is predicted that the P consumption peak will occur in the next 10 to 20 years. Therefore, there is an urgent need to find accessible sources in the immediate environment, such as soil, and to use alternative resources of P such as waste streams. While enormous progress has been made in chemical P recovery technologies, most biological technologies for P recovery are still in the developmental stage and are not reaching industrial application. Nevertheless, biological P recovery could offer good solutions as these technologies can return P to the human P cycle in an environmentally friendly way. This mini‐review provides an overview of the latest approaches to make P available in soil and to recover P from plant residues, animal and human waste streams by exploiting the universal trait of P accumulation and P turnover in microorganisms and plants.

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“…Food waste after landfilling produces methane as a potent greenhouse gas. The transfer of food waste from landfills to wastewater treatment plants, enable to capture the generated methane for renewable energy purposes and at the same time reduces the greenhouse gas emissions due to the energy offsets provided by using an on-site, renewable source of energy (Awasthi et al, 2020). Wastewater treatment facilities should anticipate seeing efficiency gains from the combination of anaerobic digesters with food waste that included lower energy cost due to on site power generation.…”

Section: Introductionmentioning

confidence: 99%

“…This is generally attributed to diminished landfill space and/or targets for recycling. Wastewater treatment plants provide the ability to divert vast volumes of food waste, one of the biggest waste sources currently going to landfills worldwide (Awasthi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Volatile Fatty Acids (VFAs) Generated by Anaerobic Digestion Serve as Feedstock for Freshwater and Marine Oleaginous Microorganisms to Produce Biodiesel and Added-Value Compounds

et al. 2021

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Given an increasing focus on environmental sustainability, microbial oils have been suggested as an alternative to petroleum-based products. However, microbial oil production relies on the use of costly sugar-based feedstocks. Substrate limitation, elevated costs, and risk of contamination have sparked the search for alternatives to sugar-based platforms. Volatile fatty acids are generated during anaerobic digestion of organic waste and are considered a promising substrate for microbial oil production. In the present study, two freshwater and one marine microalga along with two thraustochytrids were evaluated for their potential to produce lipids when cultivated on volatile fatty acids generated from food waste via anaerobic digestion using a membrane bioreactor. Freshwater microalgae Auxenochlorella protothecoides and Chlorella sorokiniana synthesized lipids rich in palmitic acid (C16:0), stearic acid (C18:0), oleic acid (C18:1), and linoleic acid (C18:2). This composition corresponds to that of soybean and jatropha oils, which are used as biodiesel feedstock. Production of added-value polyunsaturated fatty acids (PUFA) mainly omega-3 fatty acids was examined in three different marine strains: Aurantiochytrium sp. T66, Schizochytrium limacinum SR21, and Crypthecodinium cohnii. Only Aurantiochytrium sp. T66 seemed promising, generating 43.19% docosahexaenoic acid (DHA) and 13.56% docosapentaenoic acid (DPA) in total lipids. In summary, we show that A. protothecoides, C. sorokiniana, and Aurantiochytrium sp. T66 can be used for microbial oil production from food waste material.

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RETRACTED: Changes in global trends in food waste composting: Research challenges and opportunities

Cited by 216 publications

References 111 publications

From anaerobic to aerobic treatment: upcycling of digestate as a moisturizing agent for in-vessel composting process

From anaerobic to aerobic treatment: upcycling of digestate as a moisturizing agent for in-vessel composting process

New developments in biological phosphorus accessibility and recovery approaches from soil and waste streams

Volatile Fatty Acids (VFAs) Generated by Anaerobic Digestion Serve as Feedstock for Freshwater and Marine Oleaginous Microorganisms to Produce Biodiesel and Added-Value Compounds

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