Sewage Sludge Management and Application in the Form of Sustainable Fertilizer

Sugurbekova, Gulnar; Nagyzbekkyzy, Elvira; Sarsenova, Ainur; Danlybayeva, Gaziza; Anuarbekova, Sandugash; Kudaibergenova, Rabiga; Frochot, Céline; Acherar, Samir; Zhatkanbayev, Yerlan; Moldagulova, Nazira

doi:10.3390/su15076112

Cited by 15 publications

(4 citation statements)

References 74 publications

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“…Anaerobic digestion, for instance, allows for the conversion of organic matter in SS into biogas, cost effective, minimizing greenhouse gas emissions and reducing the potential for global warming ( Rorat et al., 2019 ; Teoh and Li, 2020 ). Additionally, composting or co-composting with other biodegradable wastes and additives is an important treatment method for SS, enabling a significant reduction in volume and minimal emissions of hazardous substances, making it environmentally acceptable when compared to incineration ( Sugurbekova et al., 2023 ). It has been also observed that applying sewage sludge at lower doses presents minimal risks to the environment, while simultaneously enhancing the grain yield and quality of crops.…”

Section: The Feasibility Environmental Risk and Mitigation Strategies...mentioning

confidence: 99%

Nutrient management: as a panacea to improve the caryopsis quality and yield potential of durum wheat (Triticum turgidum L.) under the changing climatic conditions

Melash,

Bogale,

Bytyqi

et al. 2023

Front. Plant Sci.

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The increasing human population and the changing climate, which have given rise to frequent drought spells, pose a serious threat to global food security, while identification of high-yielding drought-tolerant genotypes coupled with nutrient management remains a proficient approach to cope with these challenges. An increase in seasonal temperature, recurring drought stress, and elevated atmospheric CO2 are alarmingly affecting durum wheat production, productivity, grain quality, and the human systems it supports. An increase in atmospheric carbon dioxide can improve wheat grain yield in a certain amount, but the right amount of nutrients, water, and other required conditions should be met to realize this benefit. Nutrients including nitrogen, silicon, and sulfur supply could alleviate the adverse effects of abiotic stress by enhancing antioxidant defense and improving nitrogen assimilation, although the effects on plant tolerance to drought stress varied with nitrogen ionic forms. The application of sewage sludge to durum wheat also positively impacts its drought stress tolerance by triggering high accumulation of osmoregulators, improving water retention capacity in the soil, and promoting root growth. These beneficial effect of nutrients contribute to durum wheat ability to withstand and recover from abiotic stress conditions, ultimately enhance its productivity and resilience. While these nutrients can provide benefits when applied in appropriate amounts, their excessive use can lead to adverse environmental consequences. Advanced technologies such as precision nutrient management, unmanned aerial vehicle-based spraying, and anaerobic digestion play significant roles in reducing the negative effects associated with nutrients like sewage sludge, zinc, nanoparticles and silicon fertilizers. Hence, nutrient management practices offer significant potential to enhance the caryopsis quality and yield potential of durum wheat. Through implementing tailored nutrient management strategies, farmers, breeders, and agronomists can contribute to sustainable durum wheat production, ensuring food security and maintaining the economic viability of the crop under the changing climatic conditions.

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Section: The Feasibility Environmental Risk and Mitigation Strategies...mentioning

confidence: 99%

Nutrient management: as a panacea to improve the caryopsis quality and yield potential of durum wheat (Triticum turgidum L.) under the changing climatic conditions

Melash,

Bogale,

Bytyqi

et al. 2023

Front. Plant Sci.

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“…2) рідкої фракції із вмістом сухих речовин 1-8%, збагаченої азотом та калієм. На практиці існують два основних напрямки обробки дигестату з метою подальшого використання його як добрива, можливості подальшого транспортування отриманого продукту, виокремлення окремих складових, які можуть бути цінними для підвищення родючості ґрунтів [5,6].…”

Section: аналіз останніх досліджень і публікаційunclassified

Development of Technology for Treatment of Wastewater Digestat From the Food Industry

Shevchenko,

Miasoiedov,

Shevchenko

2023

MEC

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This article proposes a hybrid technological scheme for dewatering the digestate of wastewater from the food industry, further cleaning the obtained filtrate after dehydration with the possibility of returning it to the technological chain for reuse. At least ten different derivative products can be obtained from digestate, including liquid/solid fraction, granules obtained from both solid and liquid fractions, and analogues of commercial synthetic fertilisers: ammonium sulphate, ammonia water, magnesium ammonium phosphate (struvite). The purpose of the experimental studies was to choose an appropriate process for treating digestate of food production wastewater to solve the problem of increasing the amount of sediment and the formation of digestate. The investigated digestate treatment processes include the next: chemical conditioning (dosing of flocculants and coagulants), mechanical dewatering using multi-disc technology (with ESMIL MDQ multi-disc screw press), two stages of membrane separation (using reverse osmosis (RO) membranes, vibrating shear process (VSEP), zwitterionic (ZI) membrane). The cake separated after the dehydration stage can be processed in bulk or pallets with 10–35% dry matter content and used as fertiliser. Due to the high viscosity of the initial digestate, the technological scheme provides for its dilution before the dehydration stage. Dilution occurs with the purified filtrate after the membrane purification stage. The effectiveness of dehydration on cake dryness showed worse results than expected but deserves further investigation if this parameter is significant. Using an additional stage of filtrate purification on RO membranes is efficient and appropriate if high-quality purified water is required. The cleaning process can be stopped at any stage, depending on the cleaning needs. The obtained results regarding the efficiency of the cleaning process after RO membranes showed the following values for the main pollutants: COD – 98.43%, ammonium nitrogen – 99.35%, and phosphates – 99.99%. Keywords: digestate, sludge conditioning, coagulant, flocculent, dehydration, membrane purification, cake, permeate.

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“…Several physical, chemical and biological processes have been developed to minimize sludge production [35][36][37]. The most common methods for disposing sewage sludge are incineration, landfilling [38,39] or reuse in agriculture [40,41]. Recently, new technologies have been developed for their utilization, with particular attention paid to the lipid component, which can produce biodiesel.…”

Section: Introductionmentioning

confidence: 99%

Energy Recovery from Municipal Sewage Sludge: An Environmentally Friendly Source for the Production of Biochemicals

di Bitonto,

Angelini,

Pastore

2024

Applied Sciences

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In this work, a detailed analysis of the lipid component in primary sludge and sewage scum up-taken from several wastewater treatment plants located in southern Italy was carried out. Lipids in the primary sludge accounted for 200–250 mg/g of the total solids (TS), with calcium soaps as a main component (70–82%), while total lipids made up about 350–500 mg/gTS in the sewage scum and consisted mainly of FFAs (45–60%) and calcium soaps (27–35%). In addition, estolides and 10-hydroxystearic acid were also quantified. A specific valorization process was then developed and tested for either primary sludge or sewage scum. In detail, lipids were first recovered, chemically activated by the addition of acids (calcium soaps were converted to free fatty acids) and finally reacted with methanol to obtain methyl esters. The lipid recovery from primary sludge and sewage scum was particularly efficient (recoverability of 92–99%). The conversion of the starting acids into FAMEs (yield > 98%) was achieved under very mild conditions (70 °C, 2 h) with AlCl3·6H2O as a catalyst. Biodiesel (according to EN14214), methyl 10-hydroxystearate and methyl estolides were efficiently isolated by distillation under vacuum. Finally, a feasibility study of the proposed processes was carried out to evaluate their possible integration into a wastewater treatment plant, critically analyzing both the positive aspects and the relative limitations.

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Sewage Sludge Management and Application in the Form of Sustainable Fertilizer

Cited by 15 publications

References 74 publications

Nutrient management: as a panacea to improve the caryopsis quality and yield potential of durum wheat (Triticum turgidum L.) under the changing climatic conditions

Nutrient management: as a panacea to improve the caryopsis quality and yield potential of durum wheat (Triticum turgidum L.) under the changing climatic conditions

Development of Technology for Treatment of Wastewater Digestat From the Food Industry

Energy Recovery from Municipal Sewage Sludge: An Environmentally Friendly Source for the Production of Biochemicals

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