Recovery and concentration of thermally hydrolysed waste activated sludge derived volatile fatty acids and nutrients by microfiltration, electrodialysis and struvite precipitation for polyhydroxyalkanoates production

Tao, Bing; Passanha, Pearl; Kumi, Philemon James; Wilson, Victoria; Jones, D.E.; Esteves, Sandra

doi:10.1016/j.cej.2016.03.036

Cited by 75 publications

(18 citation statements)

References 24 publications

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“…This inhibits the methanogens present, causing a build-up of volatile fatty acids (VFAs) (Chen et al, 2008). VFAs can be used in the chemical industry, as building block chemicals (Straathof, 2014), but also as feedstocks for bioprocesses such as polyhydroxyalkanoate (PHA) production (Kleerebezem et al, 2015;Tao et al, 2016). Production of mixed VFAs through mixed-culture fermentation under anaerobic conditions is known as acidogenic fermentation (AF) (Lee et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Separation is complicated due to the low VFA concentration (<10 wt.%) with high solubility in water (Singhania et al, 2013), and the complex fermentation broth with high solid content (Zhou et al, 2018). Several methods have been proposed for recovery of VFAs from AF: nanofiltration (Longo et al, 2015;Zacharof et al, 2016), liquid-liquid extraction (Alkaya et al, 2009;Reyhanitash et al, 2016), adsorption (Rebecchi et al, 2016;Reyhanitash et al, 2017), electrodialysis (Jones et al, 2015;Tao et al, 2016) and membrane extraction (Plácido and Zhang, 2017a;Yesil et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Solvent-free membrane extraction of volatile fatty acids from acidogenic fermentation

Outram

Zhang

2018

Bioresource Technology

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Diversification of anaerobic digestion into higher value products, namely volatile fatty acids (VFAs), is receiving interest. One of the biggest challenges with this is recovery of the VFAs. Membrane extraction can be used, and a novel process configuration using a non-porous silicone membrane and water for an extractant is proposed here. This process would enable the reduction in the number of downstream unit operations compared to other membrane extraction processes. Selective recovery in favour of longer chain VFAs was demonstrated. Testing with a synthetic solution resulted in an overall mass transfer coefficient of 0.088 μm s for butyric acid, and 0.157 μm s when fermentation broth was used. This indicates this process is not hindered by fouling, but improved somehow. Although the preliminary economic analysis showed this process to require a larger membrane area compared to porous membrane alternatives, it also has a significantly reduced cost associated with the extractant.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solvent-free membrane extraction of volatile fatty acids from acidogenic fermentation

Outram

Zhang

2018

Bioresource Technology

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“…The concentrate with an elevated P level (> 100 mg L -1 ) could facilitate subsequent struvite precipitation (recovery rate > 95%) (Xie et al 2016). RO could be replaced by microfiltration (MF) for enrichment of volatile fatty acids (VFAs) towards biogas fermentation (Tao et al 2016), or membrane distillation (MD) for generating contaminant-free fresh water (Kim et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Nutrient-energy-water recovery from synthetic sidestream centrate using a microbial electrolysis cell - forward osmosis hybrid system

Zou

Qin

Moreau

et al. 2017

Journal of Cleaner Production

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Recovery of nutrients, water, and energy from high-strength sidestream centrate offers benefits such as reusable resource, minimized discharge and cost-savings in mainstream treatment. Herein, a microbial electrolysis cell-forward osmosis (MEC-FO) hybrid system has been investigated for integrated nutrient-energy-water (NEW) recovery with emphasis on quantified mass balance and energy evaluation. In a closed-loop mode, the hybrid system achieved recovery of 54.2 ± 1.9 % of water (70.4 ± 2.4 mL), 99.7 ± 13.0 % of net ammonium nitrogen (8.99 ± 0.75 mmol, with extended N 2 stripping), and 79.5 ± 0.5 % of phosphorus (as struvite, 0.16 ± 0.01 mmol). Ammonium loss primarily from reverse solute flux was fully compensated by the reclaimed ammonium under 6-h extended N 2 stripping to achieve self-sustained FO process. The generated hydrogen gas could potentially cover up to 28.7 ± 1.5 % of total energy input, rendering a specific energy consumption rate of 1.73 ± 0.08 kWh m-3 treated centrate, 0.57 ± 0.04 kWh kg-1 COD, 1.10 ± 0.05 kWh kg-1 removed NH 4 +-N, 1.17 ± 0.06 kWh kg-1 recovered NH 4 +-N, or 5.75 ± 0.54 kWh kg-1 struvite. Recycling of excess Mg 2+ reduced its dosage to 0.08 kg Mg 2+ /kg struvite. These results have demonstrated the successful synergy between MEC and FO to achieve multi-resource recovery, and encouraged further investigation to address the challenges such as enhanced hydrogen production, reducing nutrient loss, and optimizing MEC-FO coordination towards an energy-efficient NEW recovery process.

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“…VFAs are other products extractable from excess sludge. To recover them, as well as nutrients, thermally hydrolysed waste activated sludge was fermented anaerobically, and after screening and MF, the permeate was concentrated by ED [ 452 ]. The 6.15 g/L total VFAs present in the MF permeate were concentrated by ED to 19.82 g/L, corresponding to 92% of transferred mass, while 0.92 g/L

and 0.16 g/L

were concentrated to 3.02 and 0.45 g/L, respectively.…”

Section: Municipal Wastewater and Other Effluentsmentioning

confidence: 99%

Electrodialysis Applications in Wastewater Treatment for Environmental Protection and Resources Recovery: A Systematic Review on Progress and Perspectives

et al. 2020

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This paper presents a comprehensive review of studies on electrodialysis (ED) applications in wastewater treatment, outlining the current status and the future prospect. ED is a membrane process of separation under the action of an electric field, where ions are selectively transported across ion-exchange membranes. ED of both conventional or unconventional fashion has been tested to treat several waste or spent aqueous solutions, including effluents from various industrial processes, municipal wastewater or salt water treatment plants, and animal farms. Properties such as selectivity, high separation efficiency, and chemical-free treatment make ED methods adequate for desalination and other treatments with significant environmental benefits. ED technologies can be used in operations of concentration, dilution, desalination, regeneration, and valorisation to reclaim wastewater and recover water and/or other products, e.g., heavy metal ions, salts, acids/bases, nutrients, and organics, or electrical energy. Intense research activity has been directed towards developing enhanced or novel systems, showing that zero or minimal liquid discharge approaches can be techno-economically affordable and competitive. Despite few real plants having been installed, recent developments are opening new routes for the large-scale use of ED techniques in a plethora of treatment processes for wastewater.

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Recovery and concentration of thermally hydrolysed waste activated sludge derived volatile fatty acids and nutrients by microfiltration, electrodialysis and struvite precipitation for polyhydroxyalkanoates production

Cited by 75 publications

References 24 publications

Solvent-free membrane extraction of volatile fatty acids from acidogenic fermentation

Solvent-free membrane extraction of volatile fatty acids from acidogenic fermentation

Nutrient-energy-water recovery from synthetic sidestream centrate using a microbial electrolysis cell - forward osmosis hybrid system

Electrodialysis Applications in Wastewater Treatment for Environmental Protection and Resources Recovery: A Systematic Review on Progress and Perspectives

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