Using coconut husks in a full-scale decentralized wastewater treatment system: The influence of an anaerobic filter on maintenance and operational conditions of a sand filter

Cruz, Luana Mattos de Oliveira; Gomes, Bianca Graziella Lento Araujo; Tonetti, Adriano Luiz; Figueiredo, Isabel Campos Salles

doi:10.1016/j.ecoleng.2018.12.021

Cited by 33 publications

(13 citation statements)

References 26 publications

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“…This stage requires intermittent energy, which is supplied by solar panels, to pump the wastewater to the treatment system. Energy is also required periodically for sludge removal from the anaerobic stages (ST and UAF) every six to twelve months [16,27]. This procedure regularly requires the use of external suction systems to remove the excess sludge from the ST chambers and from the bottom of the UAF.…”

Section: Site Descriptionmentioning

confidence: 99%

Mathematical Modeling of a Domestic Wastewater Treatment System Combining a Septic Tank, an Up Flow Anaerobic Filter, and a Constructed Wetland

Castillo

Garibay

Senés‐Guerrero

et al. 2020

Water

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Systems combining anaerobic bioreactors with constructed wetlands (CW) have proven to be adequate and efficient for wastewater treatment. Detailed knowledge of removal dynamics of contaminants can ensure positive results for engineering and design. Mathematical modeling is a useful approach to studying the dynamics of contaminant removal in wastewater. In this study, water quality monitoring was performed in a system composed of a septic tank (ST), an up flow anaerobic filter (UAF), and a horizontal flow constructed wetland (HFCW). Biological oxygen demand (BOD5), chemical oxygen demand (COD), total Kjeldahl nitrogen (TKN), NH3, organic nitrogen (ON), total suspended solids (TSS), NO2−, and NO3− were measured biweekly during a 3-month period. First-order kinetics, multiple linear regression, and mass balance models were applied for data adjustment. First-order models were useful to predict the outlet concentration of pollutants (R2 > 0.87). Relevant multiple linear regression models were found, which could be applied to facilitate the system’s monitoring and provide valuable information to control and improve biological and physical processes necessary for wastewater treatment. Finally, the values of important parameters (μmax, Ks, and Yx/s) in mass-balance models were determined with the aid of a differential neural network (DNN) and an optimization algorithm. The estimated parameters indicated the high robustness of the treatment system since performance stability was found despite variations in wastewater composition.

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Section: Site Descriptionmentioning

confidence: 99%

Mathematical Modeling of a Domestic Wastewater Treatment System Combining a Septic Tank, an Up Flow Anaerobic Filter, and a Constructed Wetland

Castillo

Garibay

Senés‐Guerrero

et al. 2020

Water

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show abstract

“…For example, de Oliveira Cruz et al (2019) studied the combination of a septic tank anaerobic filter filled with green coconut shells and sand filter as feasible technology for small communities. They found that the quality of the final effluent generated allows its reuse in agricultural activities (de Oliveira Cruz et al, 2019). The leaves and the coir can also be used as bio-sorbent.…”

Section: Residue Performancementioning

confidence: 99%

Valorization of agro-industry residues in the building and environmental sector: A review

et al. 2020

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Environmental pollution has become a relevant issue as the population rises and resources decrease. Reuse and recycling still have the greatest potential as they turn the waste into a new resource, representing the ‘closed-loop’ step of a circular economy (CE). Looking for new applications for agro-industry waste represents both an environmental issue, as its incorrect disposal is a cause of pollution, and a chance to exploit zero-cost natural wastes. The present review, with around 200 articles examined, focuses on possible reuses of these residues in (a) building construction, as additives to produce thermal and acoustic insulation panels, and (b) in water treatments, exploited for removal of pollutants. The selected materials (coconut, coffee, corn, cotton and rice) have industry production wastes with suitable applications in both sectors and huge worldwide availability; their reuse may thus represent a new resource, with an impact based on the production rate and the possible replacement of current inorganic materials. Along with possible implementation of the selected materials in the building industry and environmental engineering, a brief description of the production and supply chain are provided.

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“…Mesmo quando se avaliam os compostos nitrogenados, o tanque séptico e os pós-tratamentos sugeridos pelas normas brasileiras (NBR 13969, 1997e NBR 7229, 1993 não contemplam sua remoção. As associações de reatores propostas pela norma brasileira não promovem a desnitrificação e a consequente transformação do nitrogênio orgânico em nitrogênio gasoso (N 2 ) (DE OLIVEIRA CRUZ et al, 2018;DE OLIVEIRA CRUZ et al, 2019e SILVA et al, 2015. Nem mesmo há propostas para a absorção do nitrogênio por plantas.…”

Section: A Fossa Absorvente é Inadequada?unclassified

Fossa absorvente ou rudimentar aplicada ao saneamento rural: solução adequada ou alternativa precária?

Figueiredo¹,

Miyazaki²,

Madrid³

et al. 2019

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Using coconut husks in a full-scale decentralized wastewater treatment system: The influence of an anaerobic filter on maintenance and operational conditions of a sand filter

Cited by 33 publications

References 26 publications

Mathematical Modeling of a Domestic Wastewater Treatment System Combining a Septic Tank, an Up Flow Anaerobic Filter, and a Constructed Wetland

Mathematical Modeling of a Domestic Wastewater Treatment System Combining a Septic Tank, an Up Flow Anaerobic Filter, and a Constructed Wetland

Valorization of agro-industry residues in the building and environmental sector: A review

Fossa absorvente ou rudimentar aplicada ao saneamento rural: solução adequada ou alternativa precária?

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