Sludge reduction potential of metazoa in membrane bioreactors

Luxmy, B.S.; Kubo, Toshiaki; Yamamoto, Kazuo

doi:10.2166/wst.2001.0619

Cited by 32 publications

(15 citation statements)

References 2 publications

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“…It is no doubt that worm bloom can cause release of phosphate into effluent, but such impact of worm growth on PO 4 3À -P increase in effluent was not heavy. Contrary to all of our results, Luxmy et al [108] reported that the presence (even about 1000-2000 metazoa population per ml) or absence of the metazoa population did not have any significant effect on sludge reduction in bench scale of submerged MBRs. However, metazoa population may play an effective role in membrane fouling control, especially those that were attached to the membrane.…”

Section: Oligochaetescontrasting

confidence: 99%

Minimization of excess sludge production for biological wastewater treatment

Wei

Houten²,

Borger³

et al. 2003

Water Research

623

278

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Excess sludge treatment and disposal currently represents a rising challenge for wastewater treatment plants (WWTPs) due to economic, environmental and regulation factors. There is therefore considerable impetus to explore and develop strategies and technologies for reducing excess sludge production in biological wastewater treatment processes. This paper reviews current strategies for reducing sludge production based on these mechanisms: lysis-cryptic growth, uncoupling metabolism, maintenance metabolism, and predation on bacteria. The strategies for sludge reduction should be evaluated and chosen for practical application using costs analysis and assessment of environmental impact. High costs still limit technologies of sludge ozonation-cryptic growth and membrane bioreactor from spreading application in full-scale WWTPs. Bioacclimation and harmful to environment are major bottlenecks for chemical uncoupler in practical application. Sludge reduction induced by oligochaetes may present a cost-effective way for WWTPs if unstable worm growth is solved. Employing any strategy for reducing sludge production may have an impact on microbial community in biological wastewater treatment processes. This impact may influence the sludge characteristics and the quality of effluent. r

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Section: Oligochaetescontrasting

confidence: 99%

Minimization of excess sludge production for biological wastewater treatment

Wei

Houten²,

Borger³

et al. 2003

Water Research

623

278

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“…They observed that the ozonated bioreactor contained a greater diversity of bacteria, protozoa, and metazoa compared to the non-ozonated bioreactor. Protozoa and metazoa are bacterial predators that can be selectively cultivated to reduce sludge (Luxmy et al, 2001;Semblante et al, 2014b). Chiellini et al, (2014) analysed full-scale aerobic digesters receiving ozonated and non-ozonated WAS using terminal restriction fragment length polymorphism (T-RFLP) analysis of the 16S rRNA gene.…”

Section: Microbial Diversity Transformationmentioning

confidence: 99%

“…In other words, reducing sludge production is preferable to treating sludge that has already been produced. Various techniques have been employed for this purpose, including the optimisation of operating parameters (aeration and SRT) (Khursheed & Kazmi, 2011;Wei et al, 2003), sludge disintegration by physical or advanced oxidation processes (AOPs) (Foladori et al, 2010), addition of chemicals Liu, 2003), use of microbial predators such as protozoa, metazoa, and worms (Ghyoot & Verstraete, 2000;Huang et al, 2007;Luxmy et al, 2001), and the oxic-settling-anoxic (OSA) process (Semblante et al, 2014a). The applicability of these techniques varies depending on sludge reduction, effect on wastewater treatment efficiency, effect on sludge properties, and cost (Table 1).…”

Section: Introductionmentioning

confidence: 99%

Holistic sludge management through ozonation: A critical review

Semblante

Hai

Dionysiou

et al. 2017

Journal of Environmental Management

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This paper critically reviews the multidimensional benefits of ozonation in wastewater treatment plants. These benefits include sludge reduction, removal of emerging trace organic contaminants (TrOC) from wastewater and sludge, and resource recovery from sludge. Literature shows that ozonation leads to sludge solubilisation, reducing overall biomass yield. Sludge solubilisation is primarily influenced by ozone dosage, which, in turn, depends on the fraction of ozonated sludge, ozone concentration, and sludge concentration. Additionally, sludge ozonation facilitates the removal of TrOCs from wastewater. On the other hand, by inducing cell lysis, ozonation increases the chemical oxygen demand (COD) and nutrient concentration of the sludge supernatant, which deteriorates effluent quality. This issue can be resolved by implementing resource recovery. Thus far, successful retrieval of phosphorous from ozonated sludge supernatant has been performed. The recovery of phosphorous and other resources from sludge could help offset the operation cost of ozonation, and give greater incentive for wastewater treatment plants to adapt this approach.

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“…These results suggested that the presence of oligochaetes or the integration of worm reactor with the IODVC had little effect on sludge yield. Lumxy et al [25] found that the presence or absence of the metazoa population did not have any significant effect on the increasing pattern of MLSS, i.e. metazoa population about 1000-2000 per mL was not effective to reduce sludge production in the accumulation phase in MBR.…”

Section: Sludge Yield and Sludge Settling Characteristicsmentioning

confidence: 99%

Sludge reduction potential of the activated sludge process by integrating an oligochaete reactor

Wei

Wang

Guo

et al. 2009

Journal of Hazardous Materials

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a b s t r a c tAn oligochaete reactor linked to an integrated oxidation ditch with vertical cycle (IODVC) was used to investigate the sludge reduction potential induced by worms. The presence of Tubificidae was observed in the worm reactor throughout the operational period after its inoculation, and Tubificidae was occasionally found in the IODVC. Free-swimming worms, Aeolosoma hemprichi, Nais elinguis, and Aulophorus furcatus, were found in both the IODVC and the worm reactor, but A. hemprichi was dominant. A. hemprichi reached its maximum, 322 and 339 Aeolosoma/mL mixed liquor on day 49 in the worm reactor and the IODVC, respectively. The presence of oligochaetes or the integration of worm reactor with the IODVC had little effect on sludge yield, but the worm growth was helpful for improving sludge settling characteristics. The average sludge yield and sludge volume index (SVI) in the IODVC were 0.33 kgSS/kgCOD removed and 78 mL/g, respectively. The worm presence had little impact on effluent quality of the IODVC, but it caused phosphorus release into the effluent. The average COD, NH 4 + -N, and SS concentrations in the effluent of the IODVC were 49.06, 12.82, and 58.25 mg/L, respectively. No total nitrogen (TN) release into the effluent of the IODVC occurred.

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Sludge reduction potential of metazoa in membrane bioreactors

Cited by 32 publications

References 2 publications

Minimization of excess sludge production for biological wastewater treatment

Minimization of excess sludge production for biological wastewater treatment

Holistic sludge management through ozonation: A critical review

Sludge reduction potential of the activated sludge process by integrating an oligochaete reactor

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