Recent advances in energy efficient biological treatment of municipal wastewater

Daverey, Achlesh; Pandey, Deepshikha; Verma, Priyanka; Verma, Shelly; Shah, Vijendra; Dutta, Kasturi; Arunachalam, A.

doi:10.1016/j.biteb.2019.100252

Cited by 50 publications

(16 citation statements)

References 114 publications

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“…Moreover, the algal isolate, while removing nutrients from the UWW effluent, produced a high biomass, rich in biotechnologically valuable compounds, such as Chls, Cars, starch and proteins, thus suggesting its profitable use as food/feed supplements or, even better, as biofertilizers [ 97 ]. Instead, the employment of the microalgal biomass in the bioenergetic sector, which is mainly proposed for lipid-rich microalgae derived from wastewater treatments [ 1 , 2 , 9 ], should be limited to energy production in anaerobic biodigestors, such as those present in the majority of conventional WW-TPs [ 5 ].…”

Section: Discussionmentioning

confidence: 99%

“…Urban wastewater treatment plants (WW-TP) play a central role in domestic and industrial wastewater management for safe water reuse or disposal [ 3 , 4 ]. Commonly, conventional municipal plants treat wastewaters biologically through the activated sludge process (ASP), which in turn produces a waste sludge (WAS, waste activated sludge) needing further treatments (thickening, digestion and dewatering) [ 5 ]. During the entire process, water, derived from WAS treatment, is usually still enriched in nutrients, especially nitrogen (N) and phosphorus (P); thus, it cannot be directly released into natural environments or reused.…”

Section: Introductionmentioning

confidence: 99%

“…The proposed application of microalgae derived from bioremediation processes is mainly for the production of biofuels or biofertilizer, but also for feeding anaerobic biodigestion plants [ 1 , 2 , 9 , 19 , 22 , 26 ]. It is known that conventional WW-TPs are energy-consuming, with a resulting elevated energy bill; for example, aeration in the biological reactor alone requires 47–70% of total energy and remains a major issue in the economic management of these plants [ 5 , 27 , 28 , 29 , 30 ]. Thus, anaerobic digestion of sludge is common in WW-TPs as a method for energy recovery, and the co-digestion of sludge and microalgal biomass, harvested from integrated phytoremediation ponds, is proposed to relieve the energetic costs [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…It is known that conventional WW-TPs are energy-consuming, with a resulting elevated energy bill; for example, aeration in the biological reactor alone requires 47–70% of total energy and remains a major issue in the economic management of these plants [ 5 , 27 , 28 , 29 , 30 ]. Thus, anaerobic digestion of sludge is common in WW-TPs as a method for energy recovery, and the co-digestion of sludge and microalgal biomass, harvested from integrated phytoremediation ponds, is proposed to relieve the energetic costs [ 5 ]. Whatever the final application of algal biomass, its harvesting is also a relevant issue.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Nitrogen and Phosphorus from Thickening Effluent of an Urban Wastewater Treatment Plant by an Isolated Green Microalga

Baldisserotto

Demaria

Accoto

et al. 2020

Plants

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Microalgae are photosynthetic microorganisms and are considered excellent candidates for a wide range of biotechnological applications, including the removal of nutrients from urban wastewaters, which they can recover and convert into biomass. Microalgae-based systems can be integrated into conventional urban wastewater treatment plants (WW-TP) to improve the water depuration process. However, microalgal strain selection represents a crucial step for effective phytoremediation. In this work, a microalga isolated from the effluent derived from the thickening stage of waste sludge of an urban WW-TP was selected and tested to highlight its potential for nutrient removal. Ammonium and phosphate abatements by microalgae were evaluated using both the effluent and a synthetic medium in a comparative approach. Parallelly, the isolate was characterized in terms of growth capability, morphology, photosynthetic pigment content and photosystem II maximum quantum yield. The isolated microalga showed surprisingly high biomass yield and removal efficiency of both ammonium and phosphate ions from the effluent but not from the synthetic medium. This suggests its clear preference to grow in the effluent, linked to the overall characteristics of this matrix. Moreover, biomass from microalgae cultivated in wastewater was enriched in photosynthetic pigments, polyphosphates, proteins and starch, but not lipids, suggesting its possible use as a biofertilizer.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Removal of Nitrogen and Phosphorus from Thickening Effluent of an Urban Wastewater Treatment Plant by an Isolated Green Microalga

Baldisserotto

Demaria

Accoto

et al. 2020

Plants

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“…Conventionally, the municipal wastewater is treated biologically with the activated sludge process (ASP) (Daverey et al, 2019;Gorsalitz, 2012). Though the ASP is highly e cient in removing the chemical oxygen demand from municipal wastewater, it consumes a huge amount of energy and cost in the disposal of a large volume of waste sludge (Daverey et al, 2019;McCarty et al, 2011;Resende et al, 2019). Unlike conventional biological reactors, wetland systems do not produce secondary sludge (Sun et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Effects of Ornamental Wetland Polyculture Combinations on Urban Sewage Treatment

Wang

Yu-jue

Lin

et al. 2021

Preprint

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Previous studies have shown that wetland plants can treat wastewater in a cost-effective and sustainable way, however, the studies on the performance of ornamental wetland plant diversity in treating urban sewage were scarce. Therefore, this study was conducted to assess and select wetland polyculture combination that was effective in urban sewage treatment in subtropical areas. We formed five combinations out of six ornamental wetland plant species including Thalia dealbata, Cyperus alternifolius, Iris pseudacorus, Lythrum sastlicaria, Nymphaea tetragona, and Zantedeschia aethiopica. The growth state and removal effects of each plant combination were systematically measured and assessed. The results indicated all the combinations exhibited remarkable total nitrogen (TN), total phosphorus (TP), ammonium nitrogen (NH4+-N), and chemical oxygen demand chromium (CODcr) removal rate of 70.75%-77.67%, 63.86%-73.71%, 69.73%-76.85%, and 57.28%-75.69%, respectively. Additionally, pH was reduced to 7.54-8.00 in the sewage. The purification effect reached the best during 30-36th day. The comprehensive assessment showed the mixture of Thalia dealbata + Cyperus alternifolius, closely followed by Thalia dealbata + Cyperus alternifolius+ Lythrum sastlicaria, was highly effective at extracting various pollutants, and both of them could be used as favorable combinations to convert eutrophication and purify municipal wastewater. Linear regression showed that TP, TP, NH4+-N, and CODcr. were significantly related to plant biomass, indicating that plant biomass essential indicator for screening purification plants. Our study highlighted the importance of plant diversity in biological wastewater treatment, however the competition between plants was suggested to take into consideration in future studies.

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Effect of linear anionic surfactant (sodium dodecyl sulfate) dosage on nitrogen removal performance of an anammox reactor

Verma,

Haq,

Daverey

2024

CLEAN Soil Air Water

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The impact of sodium dodecyl sulfate (SDS, as model linear anionic surfactant) dosage on overall nitrogen removal performance of anammox reactor alongside its microbial population and sludge properties was investigated. In this study (day 136), an anmmox sequencing batch biofilm reactor was subjected to gradual dosage of SDS from 0 to 20 mg L−1. Intriguingly, results revealed that SDS at ≥7.5 mg L−1 prompted sludge disintegration, evidenced by increased protein and polysaccharide content in the effluent. Nevertheless, reactor's average total nitrogen removal efficiency slightly improved from 83.12% (0 mg L−1) to 86.3% (20 mg L−1). The 16S rRNA gene sequencing revealed that SDS dosing significantly suppressed the unwanted and unavoidable nitrite oxidizing bacteria (NOBs) in the reactor as the abundance of genus Nitrospira declined from 40.68% (day 1) to 19.15% (day 136). The abundance of anammox genus Candidatus Kuenenia significantly improved from 1.86% (day 1) to 40.02% (day 136) as a result of NOB suppression. This study revealed that low concentration of surfactants in wastewater does not affect the anammox bacteria in a biofilm reactor. Furthermore, adding low concentrations of SDS (≥7.5 to 20 mg L−1) to wastewater may effectively suppress notorious NOBs in biofilm‐based anammox systems.

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Recent advances in energy efficient biological treatment of municipal wastewater

Cited by 50 publications

References 114 publications

Removal of Nitrogen and Phosphorus from Thickening Effluent of an Urban Wastewater Treatment Plant by an Isolated Green Microalga

Removal of Nitrogen and Phosphorus from Thickening Effluent of an Urban Wastewater Treatment Plant by an Isolated Green Microalga

Assessment of the Effects of Ornamental Wetland Polyculture Combinations on Urban Sewage Treatment

Effect of linear anionic surfactant (sodium dodecyl sulfate) dosage on nitrogen removal performance of an anammox reactor

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