Multiple Drug-Resistant Escherichia coli Phylogroups from the Belmont Valley Integrated Algal Pond System

Titilawo, Yinka; Jimoh, Taobat A.; Cowan, A. Keith

doi:10.1007/s11270-021-05440-5

Cited by 4 publications

(2 citation statements)

References 109 publications

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“…For detailed process flow diagrams, the interested reader is referred to the following publications: Mambo et al (2014), Jimoh and Cowan (2017), Laubscher and Cowan (2020), Jimoh et al (2021), and Titilawo et al, (2021).…”

Section: Methodsmentioning

confidence: 99%

Algal settling ponds contribute to final effluent quality of integrated algal pond systems for municipal sewage treatment

Dube

Cowan

2022

Water & Environment J

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Appropriate wastewater technologies and sound management are crucial to global water quality and conservation. The integrated algal pond system (IAPS), considered an efficient, passive and low‐cost wastewater treatment technology for peri‐urban spaces, is perceived to yield a final effluent unsuitable for discharge. Experiments were carried out to challenge the prevailing perception that algal‐based wastewater treatment processes and in particular IAPS produce an effluent that does not always meet national and/or regional regulatory standards. Formation of a microalgal–bacterial floc (MaB‐flocs) and settleability together with biomass removal from algal settling ponds (ASPs) is shown to reduce total suspended solids (TSS) from >50 to <20 mg L−1. Thus, production of a readily settleable MaB‐floc coupled with removal of settled biomass from ASP ensures that final effluent TSS remains below the general limit of 25 mg L−1 and yields an effluent suitable for either irrigation or discharge.

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Section: Methodsmentioning

confidence: 99%

Algal settling ponds contribute to final effluent quality of integrated algal pond systems for municipal sewage treatment

Dube

Cowan

2022

Water & Environment J

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“…The remaining gravel-and discard coal-containing wetlands received nutrient rich water from an advanced facultative pond (AFP) attached to the Belmont Valley WWTW integrated algae pond system (IAPS). Details on the configuration and operation of this IAPS have been described elsewhere (Mambo et al, 2014;Jimoh & Cowan, 2017;Laubscher & Cowan, 2020;Titilawo et al, 2021). Tap and AFP water was from 20 L reservoirs fed continuously and positioned to gravity-feed each of the four HSF CWs at a rate of 43 L/day.…”

Section: Constructed Wetland Configuration and Operationmentioning

confidence: 99%

Discard Coal as Filter Bed Material in Horizontal Subsurface Flow Constructed Wetlands: a Preliminary Study

Tebitendwa

Cowan

2023

Water Air Soil Pollut

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Constructed wetlands (CWs) are engineered systems that use the natural functions of vegetation, substrate and microorganisms to treat wastewater. In coal mining regions, low calorific coals are dumped as discard. Left unattended, discard and slurry ponds contaminate surface and groundwater, cause erosion and sedimentation of particulates into nearby rivers and dams and contribute to atmospheric pollution and landslides. This study sought to investigate the use of South African bituminous discard as filter bed material for CW. A laboratory-scale horizontal subsurface flow (HSF) CW was supplied either nutrient-poor tap water (TW) or nutrient-rich advanced facultative pond (AFP) effluent, and quality of the treated water monitored over 6 months. Additionally, residual material from the discard coal filter bed was assayed after 6 months to establish substrate stability and to assess the contribution of phyto-biodegradation. Results showed successful establishment of P. australis on discard coal, better plant performance (measured as PSII quantum yield and biomass accumulation) and greater nutrient removal when fed AFP effluent. Discard coal filter bed material had greater ash content, sustained fixed carbon and C/N ratio with unchanged electrical conductivity (EC) and sulphate and phosphate concentration, indicative of balanced ion exchange. This, along with a > 70% reduction in NH4+-N concentration, yielded a final effluent within the general limit set by the South African authority for either irrigation or discharge, into a water resource that is not a listed water resource, for volumes up to 2000 m3 on any given day.

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Aggregation/disaggregation of microalgal-bacterial flocs in high-rate oxidation ponds is a response to biotic/abiotic-induced changes in microbial community structure

Keshinro,

Titilawo

et al. 2024

J Appl Phycol

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During wastewater treatment by integrated algal pond systems (IAPS), microalgal-bacterial flocs (MaB-flocs) form naturally but periodically disaggregate, resulting in poor settling, low biomass recovery, and reduced effluent quality. This study investigates biotic/abiotic-induced changes in microbial community structure in high-rate algal oxidation ponds (HRAOP) of an IAPS on MaB-floc formation and stability during sewage treatment. Results show that dominance by Pseudopediastrum, Desmodesmus and Micractinium species in spring and summer and the chytrids, Paraphysoderma sp. in spring and Sanchytrium sp. in summer, occurred coincident with enhanced MaB-floc formation and biomass recovery (≥90%). In winter, poor floc formation and low biomass recovery were associated with dominance by Desmodesmus, Chlorella, and the Chlorella-like genus Micractinium. A principal components analysis (PCA) confirmed that combinations of colonial microalgae and associated parasitic chytrids underpin MaB-floc formation and stability in spring and summer and that unicells dominated in winter. Dominance by Thiothrix sp. coincided with floc disaggregation. Thus, changes in season, composition and abundance of colonial microalgae and associated parasitic fungi appeared to impact MaB-floc formation, whereas species composition of the bacterial population and emergence of Thiothrix coincided with floc instability and disaggregation.

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Multiple Drug-Resistant Escherichia coli Phylogroups from the Belmont Valley Integrated Algal Pond System

Cited by 4 publications

References 109 publications

Algal settling ponds contribute to final effluent quality of integrated algal pond systems for municipal sewage treatment

Algal settling ponds contribute to final effluent quality of integrated algal pond systems for municipal sewage treatment

Discard Coal as Filter Bed Material in Horizontal Subsurface Flow Constructed Wetlands: a Preliminary Study

Aggregation/disaggregation of microalgal-bacterial flocs in high-rate oxidation ponds is a response to biotic/abiotic-induced changes in microbial community structure

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