Nitrification in a completely stirred tank reactor treating the liquid phase of digestate: The way towards rational use of nitrogen

Švehla, Pavel; Radechovska, Helena; Pacek, Lukas; Míchal, Pavel; Hanč, Aleš; Tlustos, Christina

doi:10.1016/j.wasman.2017.03.041

Cited by 20 publications

(4 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nevertheless, there is a surplus of nutrients in areas with intensive agro-livestock activities and limited agricultural land as a result of excess digestate production (Hjorth et al, 2011). Therefore, transport of nutrient surplus over long distances is necessary to avoid environmental problems related to nutrient overdoses (Fuchs and Drosg, 2013;Svehla et al, 2017). Since this strategy implies high operating costs, other ways to manage digestates should be chosen (Sheets et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen and Phosphorus Recovery From Anaerobically Pretreated Agro-Food Wastes: A Review

Campos

Crutchik

Franchi

et al. 2019

Front. Sustain. Food Syst.

View full text Add to dashboard Cite

Anaerobic digestion (AD) is commonly used for the stabilization of agro-food wastes and recovery of energy as methane. Since AD removes organic C but not nutrients (N and P), additional processes to remove them are usually applied to meet the stringent effluent criteria. However, in the past years, there was a shift from the removal to the recovery of nutrients as a result of increasing concerns regarding limited natural resources and the importance given to the sustainable treatment technologies. Recovering N and P from anaerobically pretreated agro-food wastes as easily transportable and marketable products has gained increasing importance to meet both regulatory requirements and increase revenue. For this reason, this review paper gives a critical comparison of the available and emerging technologies for N and P recovery from AD residues.

show abstract

Section: Introductionmentioning

confidence: 99%

Nitrogen and Phosphorus Recovery From Anaerobically Pretreated Agro-Food Wastes: A Review

Campos

Crutchik

Franchi

et al. 2019

Front. Sustain. Food Syst.

View full text Add to dashboard Cite

show abstract

“…High ammonium content would inhibit algal growth [15], mainly because the high quantities of ammonium result in producing the free ammonia that diffuse and accumulate in a microalgae cell, ending up with a toxic affect. Dilution with freshwater and nitrification are two common solutions used to solve the issue [16]. Because algal cells growth also requires some essential elements which may not be available in the FW effluents, additives are used.…”

Section: Circular Bioeconomymentioning

confidence: 99%

Bio-Based Circular Economy and Polygeneration in Microalgal Production from Food Wastes: A Concise Review

et al. 2022

View full text Add to dashboard Cite

The production of biofuels from microalgae has gained considerable attention due to the rapid diminution of fossil fuels. Despite major advantages, microalgal biofuels deployment still faces obstacles associated with the cost of biomass production and waste disposal. The production could become more cost-effective and feasible if the wastes in the production processes are recycled/reused and the biofuels produced are co-produced with high-value co-products. The aim of this review is to discuss and analyze the importance of recycling/reusing wastes and co-producing high-value products to be implemented with biofuels from microalgal-based processes. Recent advances in circular economy/integration and polygeneration, as proper strategies, are discussed. Circular economy and integration entail the reuse of food wastes, waste biomass, and wastewater in microalgal conversion processes for producing biofuels. The main focus of the section of this review on circular economy is food waste reuse for microalgal production. Polygeneration is the production of multiple products, including a biofuel as the main product and multiple co-products to ensure process cost reduction. The results reported in relevant studies have shown that microalgal growth and metabolite accumulation could be favored by mixotrophic cultivation using wastes from the conversion processes or reused food wastes. The co-production of high-value products, including pharmaceuticals, proteins, carbohydrates, pigments, bioplastics, pellets, and biofertilizers may also favor the sustainability of biofuel production from microalgae.

show abstract

“…This behavior was attributed to the value of pH in the reactor which was not controlled and decreased throughout the experiment. Moreover, they performed the same experiment while controlling the pH (to the value of 7.0) and, in this case, the researchers did not observe any accumulation of nitrite nitrogen, a phenomenon that practically promotes the conversion of total ammonia nitrogen to nitrate [29]. Therefore, further study is needed in order to maximize the performance rates in the oxic-anoxic process, in which examination of critical parameters including the oxic-anoxic time, the pH and temperature values, and the solids retention time have to be evaluated.…”

mentioning

confidence: 91%

Treatment of Agricultural Waste Using a Combination of Anaerobic, Aerobic, and Adsorption Processes

et al. 2023

View full text Add to dashboard Cite

The generation of waste in agricultural and livestock industries, followed by inadequate treatment and uncontrolled disposal to natural recipients, results in significant environmental pollution. Thus, the efficient and integrated management of high-organic-load waste produced in such activities is a key factor for sustainability and the protection of aqueous matrices. In this work, we investigate an integrated management approach for the treatment of agricultural, high-organic-load waste via a combination of processes, with an ultimate goal to improve the characteristics of the final waste and enhance the valorization of the nutrients contained in it. Towards this direction, a waste mixture comprising pig waste, cheese dairy, and food residues was sequentially treated in a laboratory scale by anaerobic digestion, followed by activated sludge (aerobic–anoxic treatment), and last by adsorption using natural zeolite. The efficiency of two different adsorption routes was examined (magnetically agitated zeolite or packed zeolite column), while the effect of the granule sizes of zeolite (0–1 mm or 1.5–3 mm) was also evaluated with regards to the remediation of the final effluent. Excellent adsorption capacities were observed in all cases, with the larger-sized zeolite exhibiting a superior performance, while the granule size of zeolite significantly affected the lifetime of the packed columns, as the smaller-sized zeolite columns reached their saturation point faster than the larger-sized zeolite analogue. The average ammonium nitrogen removal in the column experiment was ~92%, while total phosphorus was ~68%, respectively. Overall, an almost complete remediation of the final effluent was observed when compared with the physicochemical parameters of the initial waste, with a ~96% chemical oxygen demand, ~79% total nitrogen, ~96% total phosphorus, and ~82% phenols concentration decrease, signifying the high performance of the sequential treatment strategy proposed herein.

show abstract

Nitrification in a completely stirred tank reactor treating the liquid phase of digestate: The way towards rational use of nitrogen

Cited by 20 publications

References 37 publications

Nitrogen and Phosphorus Recovery From Anaerobically Pretreated Agro-Food Wastes: A Review

Nitrogen and Phosphorus Recovery From Anaerobically Pretreated Agro-Food Wastes: A Review

Bio-Based Circular Economy and Polygeneration in Microalgal Production from Food Wastes: A Concise Review

Treatment of Agricultural Waste Using a Combination of Anaerobic, Aerobic, and Adsorption Processes

Contact Info

Product

Resources

About