Future perspectives of energy saving down-flow hanging sponge (DHS) technology for wastewater valorization—a review

Tyagi, Vinay Kumar; Ali, Musrrat; Tawfik, Ahmed; Maharjan, Namita; Kazmi, Absar Ahmad; Ōkubo, Tsutomu; Harada, Hideki

doi:10.1007/s11157-021-09573-1

Cited by 23 publications

(3 citation statements)

References 68 publications

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“…The ammonia inhibition of methanogenesis in the fermentation medium is mainly due to the accumulation of volatile fatty acids caused by imposing a high organic loading rate (Tawfik et al 2022b). Solving the problem of ammonia inhibition onto methanogens by dilution, co-digestion with low carbon-to-nitrogen ratio substrate, pretreatment (sir stripping) and trace elements addition was attempted by several investigators (Tyagi et al 2021;Uzair Ayub et al 2021). A culture of propionate degrading methanogenic improved biomethane productivity from chicken manure and overcame the ammonia inhibition by changing the imposed loading rate (Li et al 2022).…”

Section: Enhancement Of the Bacterial Communitymentioning

confidence: 99%

Bioenergy production from chicken manure: a review

et al. 2023

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Adopting waste-to-wealth strategies and circular economy models can help reduce biowaste and add value. For instance, poultry farming is an essential source of protein, and chicken manure can be converted into renewable energy through anaerobic digestion. However, there are a number of restrictions that prevent the utilization of chicken manure in bioenergy production. Here, we review the conversion of chicken manure into biomethane by anaerobic digestion with focus on limiting factors, strategies to enhance digestion, and valorization. Limiting factors include antibiotics, ammonia, fatty acids, trace elements, and organic compounds. Digestion can be enhanced by co-digestion with sludge, lignocellulosic materials, food waste, and green waste; by addition of additives such as chars, hydrochars, and conductive nanoparticles; and by improving the bacterial community. Chicken manure can be valorized by composting, pyrolysis, and gasification. We found that the growth of anaerobic organisms is inhibited by low carbon-to-nitrogen ratios. The total biogas yield decreased from 450.4 to 211.0 mL/g volatile solids in the presence of Staphylococcus aureus and chlortetracycline in chicken manure. A chlortetracycline concentration of 60 mg/kg or less is optimal for biomethanization, whereas higher concentrations can inhibit biomethane production. The biomethane productivity is reduced by 56% at oxytetracycline concentrations of 10 mg/L in the manure. Tylosin concentration exceeding 167 mg/L in the manure highly deteriorated the biomethane productivity due to an accumulation of acetate and propionate in the fermentation medium. Anaerobic co-digestion of 10% of primary sludge to 90% of chicken manure increased the biogas yield up to 8570 mL/g volatile solids. Moreover, chemicals such as biochar, hydrochar, and conducting materials can boost anaerobic digestion by promoting direct interspecies electron transfer. For instance, the biomethane yield from the anaerobic digestion of chicken manure was improved by a value of 38% by supplementation of biochar.

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Section: Enhancement Of the Bacterial Communitymentioning

confidence: 99%

Bioenergy production from chicken manure: a review

et al. 2023

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“…Wastewater treatment plants are typically designed to remove nitrogen, phosphorus, and chemical oxygen demand from wastewater (Ismail and Tawfik 2016;Ismail et al 2021). As a result, the presence of emerging pollutants in the influent wastewater may impact the treatment processes and the quality of the treated effluent (Tyagi et al 2021). The types and concentrations of emerging pollutants that could reach wastewater treatment plants vary according to the source, dose management, and persistent nature of the emerging pollutants (Tawfik et al 2022b).…”

Section: Emerging Pollutants In Wastewatermentioning

confidence: 99%

Methods to alleviate the inhibition of sludge anaerobic digestion by emerging contaminants: a review

et al. 2022

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The rising occurrence of emerging contaminants in sludges both inhibits the anaerobic digestion of sludges and induces health issues when sludges are recycled in agriculture, calling for methods to remove contaminants. Here we review emerging pollutants in wastewater treatment plants, before and after anaerobic digestion. We present their inhibitory effects and remediation methods to alleviate inhibition. Pharmaceuticals have been detected in about 50% of the sludge samples. Sewage sludge contaminants include 19% of diuretics, 16–21% of lipid-modifying agents, hydrochlorothiazide, diclofenac, furosemide, clarithromycin, atorvastatin, and carbamazepine. Levels of antibiotics, azithromycin, ciprofloxacin, and estrone range from 500 to 600 ng/g in sludges from wastewater treatment plants. Remediation methods comprise electrooxidation, ultrasonication, thermal hydrolysis, ozonation, and bioaugmentation. Fermenting the sludges with acidogenic bacteria reduces the level of emerging pollutants in the supernatant. Nonetheless, liquid digestates still contains emerging pollutants such as sunscreen octocrylene at 147 ug/L and acetaminophen at 58.6 ug/L. As a result, pretreatment of sludge containing emerging pollutants is required.

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“…A variety of different methods are currently applied for the posttreatment of anaerobic effluent (UASB effluent), such as coagulationflocculation (CF), activated sludge process (ASP), polishing ponds (PP), rotating biological contractors (RBC), bio-towers (BT), sequencing batch reactors (SBR), constructed wetlands (CW), down-flow hanging sponge reactors (DHS), trickling filters (TF), and so forth. [1][2][3] However, the drawbacks of these technologies are high operation and maintenance costs (CF, ASP, SBR), high construction costs (ASP, SBR, DHS), low organics and solid removals (CW, RBC, BT, TF), and low nutrients removal (CF, PP, RBC, BT, CW, DHS, TF) efficiency. 1,4,5 Many of these technologies are not implemented on the full scale, because a large area is required for their implementation in the field.…”

Section: Introductionmentioning

confidence: 99%

Cultivation of aerobic granular biomass in continuous flow‐intermittent decant type reactor fed with anaerobic effluent

Rayaz,

Khatoon,

Khan

2023

Env Prog and Sustain Energy

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This study aimed to investigate the feasible operating conditions for the formation of aerobic granular biomass (AGB) in a continuous flow‐intermittent decant (CFID) type reactor. During the start‐up phase, that is, the operational period – I, the reactor was fed with sewage, and aerobic granules began to grow after 20 days of reactor start‐up. In period – II, experiments were conducted with 50% sewage and 50% anaerobic effluent (i.e., UASB‐treated effluent) as substrates, and subsequently, upon successful formation of mature granules, anaerobic effluent was added throughout operational periods III and IV. Results inferred that the highest removal of COD, NH4+N, TN, and PO43−P was observed in the study periods III and IV, with removal rates of 75.2 ± 10.97%, 79.24 ± 14.81%, 67.66 ± 7.17%, and 47.12 ± 14.69%, respectively. The particle size analysis shows the size of the granules was significantly increased in period IV of the study compared to previous study phases. The scanning electron microscopy (SEM) images referred that rod‐shaped bacteria were abundant after period I, while enriched microbial species of coccus, bacillus, and filamentous fungus were observed at the end of the study. These findings suggest that CFID‐type reactor can effectively cultivate AGB and remove organics and nutrients from anaerobic effluent.

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Future perspectives of energy saving down-flow hanging sponge (DHS) technology for wastewater valorization—a review

Cited by 23 publications

References 68 publications

Bioenergy production from chicken manure: a review

Bioenergy production from chicken manure: a review

Methods to alleviate the inhibition of sludge anaerobic digestion by emerging contaminants: a review

Cultivation of aerobic granular biomass in continuous flow‐intermittent decant type reactor fed with anaerobic effluent

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