Nitrification-denitrification of municipal wastewater without recirculation, using encapsulated microorganisms

Farazaki, Maria; Gikas, Petros

doi:10.1016/j.jenvman.2019.04.054

Cited by 39 publications

(11 citation statements)

References 24 publications

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“…Nitri cation is a critical and limiting step of nitrogen metabolism (Campos et al 2001), due to the relatively low growth rate of the nitri ers. Furthermore, nitrifying microorganisms are easily inhibited by various environmental factors (Farazaki &Gikas 2019). Previous studies have shown that Nitrosomonas and Nitrospira species are the major ammonia and nitrite oxidisers, respectively (Potgieter et al 2020), which is consistent with our ndings.…”

Section: Dw-5supporting

confidence: 92%

Nitrogen-metabolising Microorganism Analysis in Rapid Sand Filters From Drinking Water Treatment Plant by Culturing and Metagenomics

Zhang

et al. 2021

Preprint

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Sand filter (SFs) are common treatment processes for nitrogen pollutants removal in drinking water treatment plants (DWTPs). However, the mechanisms on the nitrogen-cycling role of SFs are still unclear. In this study, 16S rRNA gene amplicon sequencing was used to characterise the diversity and composition of the bacterial community in SFs from DWTPs. Additionally, metagenomics approach was used to determine the functional microorganisms involved in nitrogen cycle in SFs. Our results showed that Proteobacteria, Acidobacteria, Nitrospirae, and Chloroflexi dominated in SFs. Subsequently, 85 high-quality metagenome-assembled genomes (MAGs) were retrieved from metagenome datasets of selected SFs involving nitrification, assimilatory nitrogen reduction, and denitrification processes. Read mapping to reference genomes of Nitrospira and the phylogenetic tree of the ammonia monooxygenase subunit A gene, amoA, suggested that Nitrospira is abundantly found in SFs. Furthermore, according to their genetic content, a nitrogen metabolic model in SFs was proposed using representative MAGs and pure culture isolates. Quantitative real-time polymerase chain reaction (PCR) showed that ammonia-oxidising bacteria (AOB) and archaea (AOA), and complete ammonia oxidisers (comammox) were ubiquitous in the SFs, with the abundance of comammox being higher than that of AOA and AOB. Moreover, we identified a bacterial strain with a high NO3-N removal rate as Pseudomonas sp., which could be applied in the bioremediation of micro-polluted drinking water sources. Our study provides insights into functional nitrogen-metabolising microbes in SFs of DWTPs.

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Section: Dw-5supporting

confidence: 92%

Nitrogen-metabolising Microorganism Analysis in Rapid Sand Filters From Drinking Water Treatment Plant by Culturing and Metagenomics

Zhang

et al. 2021

Preprint

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“…In the secondary treatment, pollutants are oxidized by using chemical, physical, and biological methods. The organic compounds are oxidized into nitrates, due to this process, the nitrate composition is higher in secondary treated wastewater effluent and direct discharging of this nutrient leads to eutrophication [3,41,42]. However, in the tertiary treatment process, the reduced nitrates and other organic matters are converted into essential harmless and clean effluents [3,41,42].…”

Section: Removal Of Nitrate and Phosphate By Conventional Treatment A...mentioning

confidence: 99%

“…The published reports suggested that conventional treatment methods mainly focused on the eradication of solid wastes and suspension and reduction of BOD and COD from wastewater [3,41,42]. However, nitrate, heavy metals, and other micropollutants are not completely treated by the conventional method [43].…”

Section: Removal Of Nitrate and Phosphate By Conventional Treatment A...mentioning

confidence: 99%

Phycoremediation of nitrogen and phosphate from wastewater using Picochlorum sp.: A tenable approach

2021

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The wastewater originates from different industrial, municipal, and agriculture processes and contains different nitrogen sources, for example, nitrate, ammonium, nitrite, and phosphate such as inorganic and organic sources. The discharge of high nitrate and phosphate to the ecosystem or nearby water bodies can cause eutrophication which disbalances the aquatic ecosystem.Furthermore, ingestion of these pollutants can cause severe toxicity and disease to humans and animals. Thus, from an environmental and social perspective, its treatment is essential with no negative impact on the ecosystem. Microalgae are fundamental, mixotrophic microorganisms that treat different wastewater and utilize nitrate and phosphate in the medium as a source of nutrients. Among them, Picochlorum sp., have the potential to remove nitrogen and phosphate from wastewater. The biomass produced by Picochlorum sp. can be a promising candidate as a sustainable feedstock for biofuel and bioproducts formation. Thus, the present review provides a brief knowledge and understanding about the concentration of nitrogen and phosphate in different wastewater, their negative impacts, and the uptake mechanism of microalgae. Furthermore, the review also provides an insight into Picochlorum sp., and the effects of different physiological and nutritional factors on their growth, wastewater treatment efficacy, and biomass for value-added products and biorefinery applications. In addition, the review is useful to understand the potential of Picochlorum sp. for a tenable wastewater treatment process.

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“…In the present study, especially high N values were observed, which in the river MZ ranged from 6.44 to 28.50 mg/L in terms of TN and from 3.63 to 20.10 mg/L in terms of N-NH 4 . Inorganic N forms such as highly bioavailable N-NH 4 are usually efficiently removed by the wastewater treatment processes (Farazaki and Gikas 2019;Kowalewski et al 2016;Smol et al 2018) since it causes oxygen deficiency in the wastewater receiver due to high oxygen demand for its oxidation (Fuhrmeister et al 2015). A study from China on urban river N pollution (Zhang et al 2015) confirms a sharp decrease in DO concentration with the increase of N-NH 4 concentration.…”

Section: Discussionmentioning

confidence: 99%

Surface Water Pollution by Untreated Municipal Wastewater Discharge Due to a Sewer Failure

Preisner

2020

Environ. Process.

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The study is an attempt to assess the pollution impact on the aquatic ecosystem related with an emergency discharge of untreated municipal wastewater from the "Czajka" wastewater treatment plant (WWTP) in Warsaw. The present case study is based on the analysis of available monitoring data for chemical oxygen demand (COD), total nitrogen (TN), ammonia nitrogen (N-NH 4), and total phosphorus (TP) in the effluent mixing zone (MZ), the stretch of the river and before the discharge point. Data analysis was supported by a basic statistical analysis based on Pearson's correlation coefficient. The results proved the importance of efficient and reliable nutrient removal technologies used in modern WWTPs. A statistically significant correlation was achieved between the COD (r = 0.567) and TP (r = 0.714) discharged loads and their concentration in the MZ. However, no significant correlation has been identified with TN and N-NH 4. Furthermore, the dissolved oxygen (DO) deficits in the MZ were observed within 7 days of the discharge period resulting in an average DO concentration decrease from 8.4 to 7.1 mgO 2 /L. The river stretch has not been affected by DO deficits while the average observed DO concentration 30 km behind the discharge point was 9.1 mgO 2 /L. The analysis results present the pollutants assimilation capacity of a river ecosystem and its real reaction to sudden excessive nutrient loads discharge.

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Nitrification-denitrification of municipal wastewater without recirculation, using encapsulated microorganisms

Cited by 39 publications

References 24 publications

Nitrogen-metabolising Microorganism Analysis in Rapid Sand Filters From Drinking Water Treatment Plant by Culturing and Metagenomics

Nitrogen-metabolising Microorganism Analysis in Rapid Sand Filters From Drinking Water Treatment Plant by Culturing and Metagenomics

Phycoremediation of nitrogen and phosphate from wastewater using Picochlorum sp.: A tenable approach

Surface Water Pollution by Untreated Municipal Wastewater Discharge Due to a Sewer Failure

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