Treatment of municipal wastewater UASB reactor effluent by unconventional flotation and UV disinfection

Tessele, Fabiana; Monteggia, Luiz Olinto; Rubio, J.

doi:10.2166/wst.2005.0533

Cited by 10 publications

(3 citation statements)

References 9 publications

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“…In another work an average removal by UASB treatment of 79% for fecal coliforms, 88% for Salmonella and Shigella and 87% for Vibrio was observed [48]. In another plant the removal of fecal coliforms was indicated to be above 80% [49]. Hence, actually the results reported in the above mentioned studies regarding the effects of UASB treatment on pathogens abatement appears to be slightly better than what achieved in this specific research.…”

Section: Removal Performances Of Bod5 Cod Suspended Solids and Settmentioning

confidence: 47%

UASB followed by Sub-Surface Horizontal Flow Phytodepuration for the Treatment of the Sewage Generated by a Small Rural Community

2014

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Abstract:The paper presents the results of an experimental process designed for the treatment of the sewage generated by a rural community located in the north-east of Brazil. The process consists of a preliminary mechanical treatment adopting coarse screens and grit traps, followed by a biological treatment in a UASB reactor and a sub-surface horizontal flow phytodepuration step. The use of a UASB reactor equipped with a top cover, as well as of the phytodepuration process employing a porous medium, showed to present important health advantages. In particular, there were no significant odor emissions and there was no evidence of the proliferation of insects and other disease vectors. The plant achieved the following mean abatement efficiencies: 92.9% for BOD5, 79.2% for COD and 94% for Suspended Solids. With regard to fecal indicators average efficiencies of 98.8% for fecal coliforms and 97.9% for fecal enterococci were achieved. The UASB reactor showed an important role in achieving this result. The research was also aimed at evaluating the optimal operating conditions for the UASB reactor in terms of hydraulic load and organic volumetric OPEN ACCESS Sustainability 2014, 6 6999 loading. The achieved results hence indicated that the process may be highly effective for small rural communities in tropical and sub-tropical areas.

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Section: Removal Performances Of Bod5 Cod Suspended Solids and Settmentioning

confidence: 47%

UASB followed by Sub-Surface Horizontal Flow Phytodepuration for the Treatment of the Sewage Generated by a Small Rural Community

2014

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“…The FeCl 3 coagulant and cationic polymer used in DAF systems presents a faily good removal efficiency of the UASB effluent, but these processes resulted in a significant volume of sludge. Tessele et al (2005) investigted a pilot scale UASB (50m 3 /d flow) reactor followed by conventional two stage flotation and UV disinfection system for nutrient recovery. The proposed two stage flotation unit brings the advantage of separating the biomass and sludge that contain the phosphate and hydoxide.…”

Section: Two Stage Flotation and Uv Disinfection (Tsf-uv)mentioning

confidence: 99%

Sustainable Post Treatment Options of Anaerobic Effluent

Khan¹,

Gaur²,

Kazmi³

et al. 2013

Biodegradation - Engineering and Technology

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“…In sewage treatment, CW can reduce 84% of total coliform, 96% of FIs, and 89% of EN [31]. A literature survey of sixty CW with emergent macrophytes revealed that the removal of enteric bacteria is comparable with that of conventional mechanicalbiological treatment, where typical reductions are 90-99% (1-2 log reduction) [32][33][34]. However, the result is significantly influenced by various factors, including the type of constructed wetland (surface flow, sub-surface flow, hybrid flow), the HRT, and the efficiency of pre-treatment [35][36][37][38].…”

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confidence: 99%

Removal and Survival of Fecal Indicators in a Constructed Wetland after UASB Pre-Treatment

et al. 2021

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The experimentation plant, based on a sub-surface horizontal flow phytodepuration (SSHFP) unit with a pre-treatment by an upflow anaerobic sludge blanket (UASB) reactor, proved valuable in treating the sewage of a small rural community located in north Brazil. During a six-month trial, the plant achieved an average removal efficiency of 98.2% (1.74 log removal) for fecal coliforms (FC) and 96.0% (1.40 log removal) for Enterococci (EN), as well as 95.6% for BOD5, 91.0% for COD,00 and 95.4% for suspended solids (SS). The contribution of the UASB reactor to this overall performance was very significant as, alone, it achieved a yield of 62.7% for FC and 60% for EN, in addition to 65.2% for BOD5 and 65.0% for SS. EN was chosen, in addition to FC, because of its higher specificity and strong environmental persistence, leading to an increased risk to human health. In fact, the experimental results confirmed its lower removal efficiency compared to FC. The mechanical and biological mechanisms that led to such a removal efficiency of the two fecal indicators (FIs) are outlined in the article. The same mechanisms led to a good level of equivalence between the removal efficiency of the two FIs with the removal efficiency of SS and BOD5, for both the whole plant and the UASB reactor alone. The research demonstrated the close correlation between the concentrations of EN and FC for the plant effluent. This correlation can be explained by the following mathematical expression of the regression line Log EN = 0.2571 Log FC + 3.5301, with a coefficient of determination R2 = 0.912. This implies that the concentration of the more specific indicator EN could be calculated, with acceptable approximation, from the simple analysis of FC and vice versa. The experimental plant brought important health benefits to the local population. In particular, there were no significant odor emissions; moreover, the risk of fecal pathogenic diseases was drastically reduced; finally, there was no proliferation of insects and other disease vectors, due to the absence of stagnant or semi-stagnant water exposed to the atmosphere.

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Treatment of municipal wastewater UASB reactor effluent by unconventional flotation and UV disinfection

Cited by 10 publications

References 9 publications

UASB followed by Sub-Surface Horizontal Flow Phytodepuration for the Treatment of the Sewage Generated by a Small Rural Community

UASB followed by Sub-Surface Horizontal Flow Phytodepuration for the Treatment of the Sewage Generated by a Small Rural Community

Sustainable Post Treatment Options of Anaerobic Effluent

Removal and Survival of Fecal Indicators in a Constructed Wetland after UASB Pre-Treatment

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