Anaerobic Biotechnology for Sustainable Waste Treatment

Verstraete, Willy; Tanghe, Tom; Smul, Andy De; Grootaerd, H.

doi:10.1007/978-1-4615-5395-3_30

Cited by 4 publications

(4 citation statements)

References 34 publications

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“…This means that it would be desirable to uncouple the two phases for separate treatments [35]-the liquid phase with soluble organic matter, and the solid obdurate phase. This is especially the case when the UASB process becomes the main option [19], calling thus for a pre-treatment to free the liquid phase of the solids.…”

Section: Discussionmentioning

confidence: 99%

“…This thought receives added support from the fact that the biogas recovery was low, on average 46 %. Even, the repeated removal and handling of excess reactor sludge from large-scale anaerobic digesters would call for enhanced operational costs, apart from inactive solids occupying the space of the biocatalysts [19]. To put all these inherent drawbacks in context, it seems worthwhile at this point to quote [6], who noted as follows: "For the treatment of partially soluble complex wastewater the required removal efficiency of the SS should be given special attention".…”

Section: Discussionmentioning

confidence: 99%

“…In this way, the UASB reactor may achieve high COD and SS removals at relatively short hydraulic retention times (HRTs). However, the accumulation of SS in the sludge bed can provoke the displacement and dilution of active cells, the so-called biocatalysts [19], and leading to the formation of a sludge with a low methanogenic activity, a drawback which can be intensified by the accumulation of toxic or inhibitory substances present in domestic wastewater. Such accumulation must also call for frequent withdrawal of excess sludge to avoid massive washout [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Technical Problems Ensuing From UASB Reactor Application in Domestic Wastewater Treatment without Pre-Treatment

Aiyuk¹,

Odonkor²,

Theko³

et al. 2010

IJESD

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The performance and stability of a domestic sewage treatment system consisting of an upflow anaerobic sludge blanket (UASB) reactor were assessed. This was to come up with a technical evaluation of using such a system to treat directly such wastewater containing high amounts of suspended solids (SS) in developing countries like Lesotho. Through time, the evolution of the sludge bed was monitored closely, in terms of accumulation of particulate matter and its general quality. The average total chemical oxygen demand (CODt) of the wastewater was 522 mgL-1, and the system could remove 80 % of the organic matter. The sludge production in the reactor system was high (up to 70 % of influent chemical oxygen demand found as suspended solid), necessitating repeated sludge discharges from the reactor, on average every 100 days. Considering the delicate balance of the methanogens in anaerobic reactors, perturbations of the microbiota arose following the sludge extractions, and these promoted reactor imbalance. This further brought about a decrease in reactor performance and hence of the general sustainability of the UASB process when treating domestic sewage directly. In addition, the system could not remove the macronutrients nitrogen and phosphorus. Additional treatment steps would be necessary to remove the suspended solids and nutrients, and thus to effectively treat such a wastewater.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Technical Problems Ensuing From UASB Reactor Application in Domestic Wastewater Treatment without Pre-Treatment

Aiyuk¹,

Odonkor²,

Theko³

et al. 2010

IJESD

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“…It is important to stress that the four basic processes of anaerobic digestion are sequential: if the first process, hydrolysis, is incomplete, the substrate production for the second process will be smaller and so on. Indeed hydrolysis has been identified by many research workers as the ratelimiting process, especially at low temperatures (Aiyuk et al, 2006;Verstraete et al, 1997). Also, it is important to recognize that the digestion must be complete, i.e., include methanogenisis, to effect the removal of organic material from the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Influence of temperature on the performance of anaerobic treatment systems of municipal wastewater

Santos

Chaves

Haandel

2018

WSA

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Anaerobic sewage treatment systems, especially upflow anaerobic sludge blanket (UASB) reactors, have found wide application over the past decades, particularly in regions with a warm climate. A low sewage temperature is generally considered as a factor contributing to poor performance, characterized by an increase of the COD fractions in the effluent and the generated sludge, and decreasing the fraction that is transformed into methane. An experimental investigation was carried out at pilot scale to establish the values of the three COD fractions for different values of temperature and the applied organic load. The sludge age of the anaerobic treatment, together with temperature, was identified as the main operational variable that affects the efficiency of anaerobic treatment. An empirical expression was derived for the values of the three factions as a function of these two variables. From the results of the experimental investigation it was apparent that there is no point in applying a sludge age of more than 100 d, when the reactor is near its best performance. An expression was derived to establish the hydraulic retention time for maximum digestion efficiency as a function of temperature, concentration and composition of organic material and sludge mass. It was established that the main limit to the sludge hold-up in UASB reactors treating sewage is not the sludge settleability, but rather the break-up of flocs leading to loss of small, poorly-settling particles.

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Technical evaluation of potential drawbacks in direct UASB treatment of raw domestic sewage

Aiyuk

Odonkor

Theko

et al. 2010

2010 International Conference on Environmental Engineering and Applications

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Anaerobic Biotechnology for Sustainable Waste Treatment

Cited by 4 publications

References 34 publications

Technical Problems Ensuing From UASB Reactor Application in Domestic Wastewater Treatment without Pre-Treatment

Technical Problems Ensuing From UASB Reactor Application in Domestic Wastewater Treatment without Pre-Treatment

Influence of temperature on the performance of anaerobic treatment systems of municipal wastewater

Technical evaluation of potential drawbacks in direct UASB treatment of raw domestic sewage

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