Reduction of biomass decay rate under anoxic and anaerobic conditions

Siegrist, Hansruedi; Brunner, I.; Koch, Gerhard; Phan, Linh Con; Le, Van Chieu

doi:10.2166/wst.1999.0028

Cited by 77 publications

(57 citation statements)

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“…Denitrification rates varied around 30±3 μg.ml −1 .d −1 for the three soils, which is quite uniform, but are somewhat lower than Siegrist et al (1999) found in activated sludge (70-100 μg.ml −1 .d −1 ).…”

Section: Floodplain Soil Reductionmentioning

confidence: 57%

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Delayed immobilization of heavy metals in soils and sediments under reducing and anaerobic conditions; consequences for flooding and storage

Vink

Harmsen²,

Rijnaarts

2010

J Soils Sediments

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Purpose The consequences of permanent inundation and storage of flood plain soils and aquatic sediments on metal mobility were studied. The main goal was to quantify kinetic mobilisation processes in order to pinpoint the conditions that pose emission risks to groundwater and surface waters. Materials and methods Anaerobic pore water compositions of six existing depots, containing sediments from either aquatic or terrestrial origin, were measured to obtain reliable field references. Reduction experiments were performed with SOFIE cells, in which time-dynamic measurements of reducing pore waters were carried out at the reigning redox conditions. A parallel experiment tested the possibility if sulfide-deficiencies could be compensated by the reduction of added gypsum, thus increasing the available pool of reactive S. Model calculations were performed to distinguish between the thermodynamic and kinetic processes. Results and discussion Reduction of flood plain soils showed that dissolved organic matter (DOM) concentrations increased up to 7-fold over time, as a result of nutrient-mediated metabolic boost of organic matter degrading microorganisms. The association of metals to DOM increased significantly due to the loss of reactive Mn-oxide and Fe-oxyhydroxide sorption phases during reduction. DOM released metals only slowly, therefore kinetically hindering the phase shifting to stable metalsulfide precipitates. The observed effects lasted at least 10 months. In aquatic sediments, reduction rates of sulphates were six times faster, and the release of DOM occurred in lower amounts than in soils from terrestrial origin. It is shown that the addition of gypsum stimulates the formation of sulfides, thereby decreasing dissolved concentrations of most metals. On the short term however, the addition of gypsum leads to elevated concentrations of Zn and Cd due to increased electrolyte strength and subsequent Ca-metal-competition for sorption sites. This effect may be eliminated by not only adding an electron acceptor to the sediment, but also an effective donor, e.g., degradable organic matter. Conclusions For depots containing flood plain soils, the same kinetic mechanisms were observed as in the reduction experiments (elevated production of DOM and associated metals). It was concluded that reduction of flood plain soils may not necessarily result in efficient metal trapping. When storage is considered, a distinction should be made between sediments of terrestrial and aquatic origin.

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Section: Floodplain Soil Reductionmentioning

confidence: 57%

“…The effect of P-release from the solid state to solution is enhanced by what was suggested by Siegrist et al (1999). They found a 6-fold P-release in sludge that became anaerobic, which they attributed to a reduced phosphate uptake by microorganisms.…”

Section: Floodplain Soil Reductionmentioning

confidence: 87%

Delayed immobilization of heavy metals in soils and sediments under reducing and anaerobic conditions; consequences for flooding and storage

Vink

Harmsen²,

Rijnaarts

2010

J Soils Sediments

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“…Despite this general agreement on chemical and biochemical mechanisms, the final result of oxidation seldom follows generic rules and often remains uncertain. The final endpoint is the sum of intermediate reactions that occur during oxidation and is largely dictated by the solid phase composition of the substrate and its ability to counteract adverse effects [70][71][72][73]. In Table 1, some of these reactions are summarized.…”

Section: Risk Assessment Of Substrates On Landmentioning

confidence: 99%

Fate of Trace Metals in Anaerobic Digestion

Fermoso

Hullebusch²,

Guibaud

et al. 2015

Advances in Biochemical Engineering/Biotechnology

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A challenging, and largely uncharted, area of research in the field of anaerobic digestion science and technology is in understanding the roles of trace metals in enabling biogas production. This is a major knowledge gap and a multifaceted problem involving metal chemistry; physical interactions of metal and solids; microbiology; and technology optimization. Moreover, the fate of trace metals, and the chemical speciation and transport of trace metals in environmentsoften agricultural lands receiving discharge waters from anaerobic digestion processes -is completely unknown but simultaneously represents challenges for environmental protection and opportunities to close process loops in anaerobic biotechnologies. Affiliation 1.

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“…The aeration was continued on weekends and holidays in the absence of influent flow. This prevented putrefaction but would also contribute to biomass decay (Siegrist et al, 1999). Further, the reactor contents experienced variations in temperature (9-29 o C), influent COD (46-697 mg·ℓ ).…”

Section: Cod Nitrogen and Phosphorus Removalmentioning

confidence: 99%

Field testing of polymeric mesh and ash-based ceramic membranes in a membrane bioreactor (MBR) for decentralised sewage treatment

Tewari

Singh

Batra

et al. 2012

WSA

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This paper presents the initial findings of field testing of 2 low-cost membrane filters, viz. 30 μm polymeric mesh and 2-6 μm macroporous waste-ash based ceramic filter, in a submerged membrane bioreactor (MBR) employing batch anoxic and aerobic conditions. The influent was raw wastewater from a residential complex located near Delhi, India. The results indicated that the ceramic filter was able to operate for longer periods without cleaning; however, there is a limit to the transmembrane pressure it can withstand. The suspended solids retention was high with both filters (average of 96%). Moderate reduction in chemical oxygen demand (COD), total nitrogen (NH 4 + ) and total phosphorus (PO 4 3-) was achieved. The improvements in operation required in such systems are also underlined.

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Reduction of biomass decay rate under anoxic and anaerobic conditions

Cited by 77 publications

References 0 publications

Delayed immobilization of heavy metals in soils and sediments under reducing and anaerobic conditions; consequences for flooding and storage

Delayed immobilization of heavy metals in soils and sediments under reducing and anaerobic conditions; consequences for flooding and storage

Fate of Trace Metals in Anaerobic Digestion

Field testing of polymeric mesh and ash-based ceramic membranes in a membrane bioreactor (MBR) for decentralised sewage treatment

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