Antibiotics in shallow groundwater underlying urban informal settlements in developing countries: influence of on-site sanitation practices and risk assessment

Twinomucunguzi, Felix R. B.; Nyenje, Philip M.; Semiyaga, Swaib; Kebirungi, Phionah; Kulabako, Robinah; Kansiime, Frank

doi:10.1080/1573062x.2022.2059688

Cited by 7 publications

(2 citation statements)

References 50 publications

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“…Studies on FS management in low income areas revealed that users of public toilets dispose solid wastes which contain metal compounds into the pit (Chiposa et al, 2017). High concentration of some metals such as copper and zinc in pit latrines could have also resulted from disposal of wastes which contain petrochemicals, contain cosmetics and leaching from solid waste damping sites since the study area has a lot of uncontrolled solid waste dumping (Tervahauta et al, 2014;Twinomucunguzi et al, 2022). The presence of lead (Pb) in the sludge could be as a result of disposal of materials such as lead-acid batteries, rubber and plastics into the pits (Appiah-Effah et al, 2014).…”

Section: General Pit Latrine Fs Characteristicsmentioning

confidence: 99%

Application of black soldier fly larvae in decentralized treatment of faecal sludge from pit latrines in informal settlements in Kampala city

Richard

Semiyaga

Niwagaba

et al. 2023

Front. Environ. Sci.

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Introduction: Faecal sludge management (FSM) in urban areas of low-and middle-income countries (LMICs) is not properly implemented due to inaccessibility of sanitation facilities and high faecal sludge (FS) emptying costs, amongst others. Unlike in solid waste and fresh human excreta, use of black soldier fly larvae (BSFL) in treatment of FS from pit latrines - which are the most common sanitation facilities in urban areas of LMICs - has not yet been explored. Moreover, the optimal conditions for efficient FS degradation, such as moisture content, feeding rate and larval density are not yet well known. Against this backdrop, the overarching aim of this study was to determine the effectiveness of BSFL in treating FS under different conditions of moisture content, feeding rate and larval density. Also, the quality of residue left after treatment was assessed.Methods: FS samples were collected from lined and unlined pit latrines in Bwaise I parish in Kampala, Uganda and experiments were set up to feed 10-day old larvae.Results and Discussion: The optimum feeding rate, larval density and moisture content were found to be 50 mg/larvae/day, 1.33 larvae/cm2 and 60%, respectively. The reduction efficiency at optimum conditions were 72% and 66% for FS from lined and unlined pit latrines, respectively. It was further noted that BSFL can feed on FS from pit latrines without dewatering it, hence there is no need for a dewatering unit. The properties of the residue left after treatment were within the allowable limit for use as compost except for helminth egg concentration. Thus, in informal urban settlements, BSFL can be applied for effective treatment of FS from pit latrines while generating good quality residue thereby providing an additional value chain in FSM.

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Section: General Pit Latrine Fs Characteristicsmentioning

confidence: 99%

Application of black soldier fly larvae in decentralized treatment of faecal sludge from pit latrines in informal settlements in Kampala city

Richard

Semiyaga

Niwagaba

et al. 2023

Front. Environ. Sci.

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“…Furthermore, it has been reported that the removal efficiency of antibiotics was inadequate in a WWTP [16]. As a result, various kinds of antibiotics have been detected in the aquatic ecosystem, such as surface water [17,18], groundwater [19,20], seawater [21], and drinking water [22,23]. The half-lives of antibiotics in aquatic environments range from a few minutes to a few dozens of days [24].…”

Section: Introductionmentioning

confidence: 99%

The Degradation of Antibiotics by Reactive Species Generated from Multi-Gas Plasma Jet Irradiation

Tanaka,

Osawa,

Yamagishi

et al. 2023

Plasma

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Methicillin-resistant Staphylococcus aureus (MRSA) often causes serious infections in hospitals. Vancomycin is widely accepted as the standard therapy for MRSA infection, but its widespread use has resulted in the generation of vancomycin-resistant S. aureus (VRSA). To reduce the potential risk of MRSA and VRSA emergence in aquatic environments, we investigated the degradation of methicillin and vancomycin by cold atmospheric pressure plasma jet (APPJ) irradiation using N2, O2, and CO2 gases. The concentrations of methicillin and vancomycin in distilled water were decreased in a time-dependent manner by the plasma jet irradiation; that is, compared with the pre-treatment levels, the concentrations of methicillin and vancomycin were reduced by 20 to 50% after plasma jet irradiation for 10 s. No methicillin and vancomycin signals were detected after 300 s irradiation. Reactive species generated from the plasma jet electrophilically attacked and fragmented the antibiotic molecules. The present method realizes direct plasma ignition in a solution, and therefore, the reactive species can easily react with antibiotic molecules. In addition, plasma can be generated from various gas species that are abundant in the atmosphere. Therefore, cold APPJ irradiation can be a powerful, cost-effective, and environmentally friendly means for the treatment of antibiotics in aqueous samples.

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Soil Antibiotics: How Long Will This Matrix be Neglected?

da Silva Freitas,

Baptista,

da Silva Júnior

et al. 2024

Water Air Soil Pollut

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Antibiotics in shallow groundwater underlying urban informal settlements in developing countries: influence of on-site sanitation practices and risk assessment

Cited by 7 publications

References 50 publications

Application of black soldier fly larvae in decentralized treatment of faecal sludge from pit latrines in informal settlements in Kampala city

Application of black soldier fly larvae in decentralized treatment of faecal sludge from pit latrines in informal settlements in Kampala city

The Degradation of Antibiotics by Reactive Species Generated from Multi-Gas Plasma Jet Irradiation

Soil Antibiotics: How Long Will This Matrix be Neglected?

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