Nutrient recovery from anaerobically digested chicken slurry via struvite: Performance optimization and interactions with heavy metals and pathogens

Muhmood, Atif; Wu, Shubiao; Lu, Jiaxin; Ajmal, Zeeshan; Luo, Hongzhen; Dong, Renjie

doi:10.1016/j.scitotenv.2018.04.129

Cited by 80 publications

(32 citation statements)

References 63 publications

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“…This showed that optimal pH value for struvite precipitation was likely in the range of 8.5-9.0, and that for pH > 9.0, the possibility of struvite precipitation, compared to the other salts, was significantly diminished. Although struvite precipitation was observed optimally, even at higher pH values in different studies [48][49][50][51], the optimal pH range was dependent on wastewater characteristics and other operating conditions [52,53]. While struvite precipitation is limited at higher pH values, phosphorus removal is always increasing with an increase of pH, and in all cases its concentration decreases rapidly after the reaction begins [54].…”

Section: Effect Of Phmentioning

confidence: 93%

“…However, the use of ACP-rich precipitate as fertilizer would depend on specific regulations on fertilizer quality by local authorities. Heavy metal impurities in calcium phosphate fertilizers are generally higher than in struvite fertilizers [67], where they are usually below the limits for heavy metal content [52]. Nevertheless, this is a situation that ought to be verified on a case-by-case basis.…”

Section: Use Of Final Precipitates As Fertilizersmentioning

confidence: 97%

“…While struvite precipitation is limited at higher pH values, phosphorus removal is always increasing with an increase of pH, and in all cases its concentration decreases rapidly after the reaction begins [54]. pH tends to diminish following the crystallization process due to the release of H + in the solution, based on the crystallization reactions (Equations (2) and (3)) [45,52].…”

Section: Effect Of Phmentioning

confidence: 99%

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Impact of pH and Ionic Molar Ratios on Phosphorous Forms Precipitation and Recovery from Different Wastewater Sludges

et al. 2018

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Phosphorus is an essential nutrient for plants, which use it as a basic fertilizer component and is expected to increase significantly in the coming years due to higher food crops demand. Unfortunately, the available phosphorus natural reserves are not renewable, and estimates indicate their rapid decline in the future. Urban wastewater, due to its abundance and relatively high phosphorus content, is an excellent candidate for phosphorus recovery, while the element's removal from urban effluents was introduced in the 1970 s to limit the undesired effects of eutrophication. In this study, the process of struvite (and related phosphorous compounds) crystallization was investigated for three different sludge types, and the results were compared. While most studies focus strictly on anaerobically digested sludge for high struvite precipitation efficiency, this study investigated the possibility of inducing precipitation on both aerobic (extended aeration) and anaerobic sludges produced by two wastewater treatment plants in northern Italy. Analysis of precipitates from sludge samples was compared, where the focus was on the aerobic sludge, and its potential for struvite recovery. The effect of different reaction parameters was studied under different operating conditions, and the use and effects of Ca(OH) 2 addition as an inexpensive potential pH adjustment reagent was investigated.

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Section: Effect Of Phmentioning

confidence: 93%

Section: Use Of Final Precipitates As Fertilizersmentioning

confidence: 97%

Section: Effect Of Phmentioning

confidence: 99%

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Impact of pH and Ionic Molar Ratios on Phosphorous Forms Precipitation and Recovery from Different Wastewater Sludges

et al. 2018

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“…Liquid-phase P recovery technologies could reduce, in general, the cumulative energy demand of WWTPs, by reducing energy requirements for sludge handling [67]. On average, the application of P-recovery technologies could reduce cumulative WWTP energy demand by 17.7%, and it was suggested that up to 27% overall energy advantage could exist between a biological P-recovery facility and a conventional chemical P-removing facility [68].…”

Section: Towards More Energy-efficient Wwtpsmentioning

confidence: 99%

Energy Issues in Sustainable Urban Wastewater Management: Use, Demand Reduction and Recovery in the Urban Water Cycle

2019

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Urban water systems and, in particular, wastewater treatment facilities are among the major energy consumers at municipal level worldwide. Estimates indicate that on average these facilities alone may require about 1% to 3% of the total electric energy output of a country, representing a significant fraction of municipal energy bills. Specific power consumption of state-of-the-art facilities should range between 20 and 45 kWh per population-equivalent served, per year, even though older plants may have even higher demands. This figure does not include wastewater conveyance (pumping) and residues post-processing. On the other hand, wastewater and its byproducts contain energy in different forms: chemical, thermal and potential. Until very recently, the only form of energy recovery from most facilities consisted of anaerobic post-digestion of process residuals (waste sludge), by which chemical energy methane is obtained as biogas, in amounts generally sufficient to cover about half of plant requirements. Implementation of new technologies may allow more efficient strategies of energy savings and recovery from sewage treatment. Besides wastewater valorization by exploitation of its chemical and thermal energy contents, closure of the wastewater cycle by recovery of the energy content of process residuals could allow significant additional energy recovery and increased greenhouse emissions abatement.

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“…Fishery waste can also have a high phosphate content and examples of these feedstock are shown in Table 4.2. The increase in the concentration of phosphate has a direct effect on the concentration and bioavailability of others cations, such as calcium, magnesium and manganese, and hence, of the trace elements (Carliell-Marquet & Wheatley, 2002;Marti et al, 2008;Muhmood et al, 2018). Roussel and Carliell-Marquet (2016) demonstrated that iron speciation was influenced by the presence of high phosphate concentration with the formation of vivianite, especially in sewage sludge.…”

Section: Phosphate-rich Feedstockmentioning

confidence: 99%

Engineering of trace-element supplementation

Roussel¹,

Carliell-Marquet²,

Braga³

et al. 2019

Trace Elements in Anaerobic Biotechnologies

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Anaerobic digestion industries need to achieve higher performance and strive harder to play a key role in the green future of the energy sector. The importance of trace elements (TE) in the welfare of anaerobic bioreactors must be taken into account by the stakeholder/user to achieve these objectives. However, the implementation of a TE strategy is often stopped by its complexity, a lack of resource and the economic reality of a full-scale operating plant. The aim of this chapter is to support the translation of academic research findings to the engineering and operating of fullscale plant. Management tools have been developed to help operator and stakeholder in their TE assessment of their anaerobic digestion (AD) plant and suggest potential strategies to overcome deficiency. It is essential to understand the key elements of the AD system when developing the TE strategy. Feedstock

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Nutrient recovery from anaerobically digested chicken slurry via struvite: Performance optimization and interactions with heavy metals and pathogens

Cited by 80 publications

References 63 publications

Impact of pH and Ionic Molar Ratios on Phosphorous Forms Precipitation and Recovery from Different Wastewater Sludges

Impact of pH and Ionic Molar Ratios on Phosphorous Forms Precipitation and Recovery from Different Wastewater Sludges

Energy Issues in Sustainable Urban Wastewater Management: Use, Demand Reduction and Recovery in the Urban Water Cycle

Engineering of trace-element supplementation

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