Development of a staged anaerobic pond for methane recovery from domestic wastewater

Cruddas, Peter; McAdam, Ewan J.; Asproulis, Nikolaos; Antoniadis, Antonios; Ansari, Irfan Aamer; Best, D David; Jefferson, Bruce; Cartmell, Elise; Collins, Gavin; Porca, Estefanía; Peña, Miguel

doi:10.1016/j.ecoleng.2018.08.001

Cited by 5 publications

(5 citation statements)

References 38 publications

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“…Particulate COD fraction (pCOD) was calculated by subtracting sCOD from tCOD. Volatile fatty acids (VFA) and biogas volumes and compositions were measured with previously described methods [34]. Sludge depth was measured at the end of each loading rate on a grid of 0.1 m × 0.1 m using a perspex tube graduated at 1 mm intervals.…”

Section: Methodsmentioning

confidence: 99%

“…Tracer studies and specific methanogenic activity (SMA) tests were carried out according to previously described methods [34].…”

Section: Methodsmentioning

confidence: 99%

“…The internal dimensions were 1.5 m × 0.5 m × 0.25 m, giving hydraulic volumes of 188 L. A 3:1 Length:Width ratio was used in accordance with recommended AP design [8]. The SAP was created by connecting two single-stage ponds in series, with a horizontally baffled anaerobic pond (HBAP) located upstream of a vertically baffled anaerobic pond (VBAP, designed with ABR principles but under AP loading conditions) with configurations previously reported [34]. A control pond (CAP) was constructed with the same specifications as the HBAP.…”

Section: Experimental Reactor Designmentioning

confidence: 99%

“…Three-dimensional single-phase CFD simulations were performed using the commercial software FLUENT v14.0.0 (ANSYS) using geometries and methods previously reported [34].…”

Section: Cfd Modellingmentioning

confidence: 99%

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The impact of hydraulic retention time on the performance of two configurations of anaerobic pond for municipal sewage treatment

Cruddas

Asproulis

Antoniadis

et al. 2021

Environmental Technology

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Anaerobic ponds have the potential to contribute to low carbon wastewater treatment, however are currently restricted by long hydraulic residence time (HRT) which leads to large land requirements. A two-stage anaerobic pond (SAP) design was trialled against a single-stage control (CAP) over four HRTs down to 0.5 days, to determine the lowest HRT at which the ponds could operate effectively. No statistical differences were observed in particulate removal between the ponds over all four HRTs, suggesting solids loading is not a critical factor in AP design. Significantly higher biogas production rates were observed in the SAP than the CAP at 1.5 d and 1.0 d HRT, and microbial community profiling suggests the two-stage design may be facilitating spatial separation of the anaerobic digestion process along reactor length. Hydrogenotrophic methanogensis dominated over aceticlastic, with acetate oxidisation a likely degradation pathway. Experimental tracer studies were compared to CFD simulations, with the SAP showing greater hydraulic efficiency, and differences more pronounced at shorter HRTs. Greater flow recirculation between baffles was observed in CFD velocity profiles, demonstrating baffles can dissipate preferential flow patterns and increase effective pond volume, especially at high flow rates. The study demonstrates the potential of APs to be operated at shorter HRTs in psychrophilic conditions, presenting an opportunity for use as pre-treatments (in place of septic tanks) and primary treatment for full wastewater flows. Two-stage designs should be investigated to separate the stages of the anaerobic digestion process by creating preferential conditions along the pond length.

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Section: Methodsmentioning

confidence: 99%

“…Tracer studies and specific methanogenic activity (SMA) tests were carried out according to previously described methods [34].…”

Section: Methodsmentioning

confidence: 99%

Section: Experimental Reactor Designmentioning

confidence: 99%

“…Three-dimensional single-phase CFD simulations were performed using the commercial software FLUENT v14.0.0 (ANSYS) using geometries and methods previously reported [34].…”

Section: Cfd Modellingmentioning

confidence: 99%

See 2 more Smart Citations

The impact of hydraulic retention time on the performance of two configurations of anaerobic pond for municipal sewage treatment

Cruddas

Asproulis

Antoniadis

et al. 2021

Environmental Technology

Self Cite

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“…The effluent from the WSPs are emptied to the surface water or reused as irrigation water and other activities when it meets the required effluent standards (Kihila, Mtei & Njau, 2015). Anaerobic ponds collect untreated wastewater and are established to reduce solid particles entering the facultative and maturation ponds as a pretreatment process (Cruddas et al, 2018). They have a smaller surface area with high depth normally 3-5m which restricts the accessibility of oxygen hence allow anaerobic decomposition that reduces the quantity of organic matter (BOD) out with effluent (Ho, Van Echelpoel & Goethals, 2017).…”

Section: Waste Stabilization Pond/ Lagoons For Energy Recoverymentioning

confidence: 99%

Integration of the energy recovery step in municipal wastewater treatment chain: a case study of Moshi municipality, Tanzania

Hance

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The energy demand which is expected to increase more worldwide has sparked the interest of researchers to find sustainable and inexpensive sources of energy. This study aims to integrate energy recovering step into municipal wastewater treatment plants (MWWTPS) through anaerobic digestion. The anaerobic digestion of municipal wastewater (MWW) and then co-digestion with sugar cane molasses (SCM) to improve its organic content was conducted at 25 oC and 37 oC. The results showed substrate mixture containing 6% of SCM and total solids (TS) of 7.52% yielded higher amount of biogas (9.73 L/L of modified substrate). However, chemical oxygen demand (COD) of the resulting digestate was high (10.1 g/L) and pH was not stable hence needed careful adjustment using 2M of NaOH solution. This study recommends substrate mixture containing SCM (2%) and TS (4.34%) having biogas production (4.97 L/L of modified substrate) for energy recovering from MWWTPS, since is found to have more stable pH and low COD residue (1.8 g/L) which will not hold back the MWW treatment process. The annual generation of modified substrate (662 973 m3 ) is anticipated to generate about 16 241 m3 of methane which produce up to 1.8 GWh and 8193 GJ per annum. The study concluded that biogas is among of the future fuel if the modern technology on anaerobic digestion is functional. Also the use of combined heat and power (CHP) engine for the conversion of biogas to heat and electrical energy increases the energy value of the wastewater. (Keywords: Anaerobic digestion, Biogas, Municipal wastewater, Sugarcane molasses)

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Sewage Treatment Through Anaerobic Processes: Performance, Technologies, and Future Developments

Pereira

Barbosa

Bassin

2022

Anaerobic Biodigesters for Human Waste Treatment

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Development of a staged anaerobic pond for methane recovery from domestic wastewater

Cited by 5 publications

References 38 publications

The impact of hydraulic retention time on the performance of two configurations of anaerobic pond for municipal sewage treatment

The impact of hydraulic retention time on the performance of two configurations of anaerobic pond for municipal sewage treatment

Integration of the energy recovery step in municipal wastewater treatment chain: a case study of Moshi municipality, Tanzania

Sewage Treatment Through Anaerobic Processes: Performance, Technologies, and Future Developments

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