Ultrasonic waste activated sludge disintegration for improving anaerobic stabilization

Tiehm, Andreas; Nickel, Klaus G.; Zellhorn, M; Neis, U.

doi:10.1016/s0043-1354(00)00468-1

Cited by 654 publications

(367 citation statements)

References 12 publications

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“…The rate-limiting step of lysis-cryptic growth is the lysis stage, and an increase of the lysis efficiency can therefore lead to an overall reduction of sludge production. Several methods have been applied for sludge disintegration so far: (i) thermal treatment in the temperature range from 40 C to 180 C [10,11], (ii) chemical treatment using acids or alkali [12], (iii) mechanical disintegration using ultrasounds, mills, and homogenizers [13][14][15][16][17][18][19][20], (iv) freezing and thawing [21], (v) biological hydrolysis with enzyme addition [22], (vi) advanced oxidation processes such as wet air oxidation, using H 2 O 2 and ozone [23][24][25][26], and (vii) combination ways such as thermo-chemical treatment [27][28][29], combination of alkaline and ultrasonic treatment [30]. But the comparison and evaluation of these processes for sludge lysis is not considered in this paper.…”

Section: Lysis-cryptic Growthmentioning

confidence: 99%

Minimization of excess sludge production for biological wastewater treatment

Wei

Houten²,

Borger³

et al. 2003

Water Research

622

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: Lysis-cryptic Growthmentioning

confidence: 99%

Minimization of excess sludge production for biological wastewater treatment

Wei

Houten²,

Borger³

et al. 2003

Water Research

622

278

View full text Add to dashboard Cite

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“…The mechanisms that worms use for hydrolysis deserve further attention because hydrolysis is considered to be the rate-limiting step in the degradation of excess sludge [34,35], and sludge predation increases this degradation rate. Even though knowledge regarding WP is steadily increasing, the underlying hydrolytic mechanism of predation has not been investigated specifically.…”

Section: Introductionmentioning

confidence: 99%

Physical and biochemical changes in sludge uponTubifex tubifexpredation

Valk

Khadem

Foreman

et al. 2016

Environmental Technology

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Worm predation (WP) on activated sludge leads to increased sludge degradation rates, irrespective of the type of worm used or reactor conditions employed. However, the cause of the increased sludge degradation rates remains unknown. This paper presents a comparative analysis of the physical and biochemical aspects of predated sludge, providing insight into the hydrolytic mechanisms underlying WP. To this end, the sessile worm Tubifex tubifex was used as a model oligochaete and was batch cultivated in an 18-L airlift reactor. Predation on activated sludge showed an average reduction rate of 12 ± 3.8%/d versus 2 ± 1.3%/d for endogenous respirated sludge. Sludge predation resulted in an increased release of inorganic nitrogen, phosphate and soluble chemical oxygen demand (sCOD). The sCOD consisted mainly of polysaccharides; however, fluorescence excitation emission matrix spectroscopy analysis also revealed the presence of Tryptophan-protein-like substances. Results suggest that the released polysaccharides contain a protein-like element. Additionally, soluble iron increased slightly in concentration after WP. The extent of hydrolysis seemed to reach an average plateau of about 40% volatile solids (VS) reduction after 4 days, which is substantially higher than the 29% VS reduction for endogenous decay of activated sludge after 30 days. Furthermore, T. tubifex predominantly consumed the protein fraction of the extracellular polymeric substances. Results suggest that that the worms specifically target a fraction of the sludge that is predominantly biodegradable under aerobic conditions, albeit at significantly higher degradation rates when compared to the endogenous decay of waste activated sludge. ARTICLE HISTORY

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“…15 However, the addition of reagents such as PBS or BBS brings about extra cost for the production of biohydrogen. Notably, SFL contains not only a rich content of organics but also certain ions (such as NH 4 + and PO 4 3À ), 16,17 which could be used as a substitute to enable the maintenance of pH cost-effectively. Hence, SFL can be fed into MECs as a feedstock and buffer solution simultaneously, which is highly meaningful for potential applications, although there has been a lack of studies.…”

Section: -9mentioning

confidence: 99%

Hydrogen production from buffer-free anaerobic fermentation liquid of waste activated sludge using microbial electrolysis system

et al. 2016

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Anaerobic fermentation liquid from waste activated sludge with a rich content of organics and phosphate ions is a promising source of carbon and electrolytes for MECs. The effects of three different electrolytes, including phosphate buffer solution (PBS), bicarbonate buffer solution (BBS), and sodium chloride (NaCl), on the performance of an MEC fed with sludge fermentation liquid (SFL) were compared under conditions of similar conductivity. The production yield of hydrogen was 0.92 mL mg À1 COD in an MEC with NaCl, which performed similarly with yields of 1.03 mL mg À1 with BBS and 1.04 mL mg À1 with PBS. The COD removal efficiencies exceeded 50% in all three groups. Although the energy efficiency of 108% with NaCl was lower than that with PBS (121%), the self-buffering system had advantages regarding cost and environment-friendly application over both PBS and BBS. Comparable performance could be obtained in an MEC with NaCl by adjusting the conductivity using SFL as a carbon source and buffer solution.

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Ultrasonic waste activated sludge disintegration for improving anaerobic stabilization

Cited by 654 publications

References 12 publications

Minimization of excess sludge production for biological wastewater treatment

Minimization of excess sludge production for biological wastewater treatment

Physical and biochemical changes in sludge uponTubifex tubifexpredation

Hydrogen production from buffer-free anaerobic fermentation liquid of waste activated sludge using microbial electrolysis system

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