Effectiveness and kinetics of ammonium removal from anaerobic sludge digester supernatant

The microstructure of anaerobic biogranules treating a wide variety of wastewaters was investigated using light and scanning electron microscopies. Biogranules were sampled from upflow anaerobic sludge blanket (UASB) reactors treating wastewater individually containing formate, acetate, propionate, butyrate, peptone, sucrose, starch, benzoate, brewery and monosodium glutamate. Results indicated that the microstructure of the biogranules was strongly dependent on the degradation kinetics of substrates. Anaerobic degradation is a multi-step process, involving fermentation/acidogenesis, acetogenesis and methanogenesis. For substrates, such as carbohydrates, of which the initial step of degradation was considerably faster than the subsequent degradation of intermediates, biogranules developed a layered microstructure. On the other hand, for substrates, such as proteins, of which the initial step of degradation was rate-limiting, a uniform microstructure would be developed. These findings are of significance for the development of kinetic models for biogranule and biofilm.

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Kinetics of anaerobic treatment of slaughterhouse wastewater in batch and upflow anaerobic sludge blanket reactor

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(03)82099-4 ◽

2003 ◽

Vol 44 (3) ◽

pp. 194

Keyword(s):

Anaerobic Treatment ◽

Upflow Anaerobic Sludge Blanket ◽

Anaerobic Sludge ◽

Slaughterhouse Wastewater ◽

Anaerobic Sludge Blanket ◽

Kinetics Of

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Effect of Intermittent Aeration in a Hybrid Vertical Anaerobic Biofilm Reactor (HyVAB) for Reject Water Treatment

Water ◽

10.3390/w12041151 ◽

2020 ◽

Vol 12 (4) ◽

pp. 1151

Author(s):

Vasan Sivalingam ◽

Carlos Dinamarca ◽

Eshetu Janka ◽

Sergey Kukankov ◽

Shuai Wang ◽

...

Keyword(s):

Water Treatment ◽

Municipal Wastewater ◽

Treatment Plant ◽

Biofilm Reactor ◽

Anaerobic Sludge ◽

Main Process ◽

Intermittent Aeration ◽

High Concentration ◽

Ammonium Removal ◽

Reject Water

Water from anaerobic sludge dewatering (reject water that is recycled to the inlet main process treatment) from the Knarrdalstrand municipal wastewater treatment plant in Porsgrunn, Norway, contains 2.4 g/L of total chemical oxygen demand (TCOD) and 550 mg/L NH4-N (annual average). The high concentration of ammonium causes disturbances in the mainstream physical and chemical processes, while only a small fraction of the organics is biodegradable. A pilot-scale hybrid vertical anaerobic biofilm (HyVAB) reactor combining anaerobic and aerobic treatment was tested for reject water treatment to reduce process disturbances. The pilot HyVAB was prepared for the study with continuous aeration of the aerobic part of the reactor for 200 days, while two intermittent aeration schemes were applied during the three-month test period. Ammonium removal efficiency increased from 8% during the continuous aeration period to 50% at the end of the test when a short (7 min) aeration cycle was applied. COD removal was close to 20%, which was mainly obtained in the anaerobic stage and not significantly influenced by the aerations schemes. Simultaneous partial nitrification and denitrification were established in the biofilm that alternated between aerobic and anoxic conditions. The observed high ammonium removal is explained by two alternative shortcut processes via nitrite. The lack of biodegradable organics in the aerated stage suggests that most of the nitrogen removal was via the anammox pathway (autotrophic denitrification). The HyVAB, combining an anaerobic sludge bed and an intermittently aerated biofilm, appears to be an efficient process to treat high ammonium containing reject water.

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The hydrodynamics of the environmental effects on the kinetics of methane formation in anaerobic sludge digestion. External mass transfer study

Environmental Technology ◽

10.1080/09593339109385085 ◽

1991 ◽

Vol 12 (10) ◽

pp. 907-913 ◽

Cited By ~ 2

Author(s):

M. Hamdi

Keyword(s):

Mass Transfer ◽

Environmental Effects ◽

Anaerobic Sludge ◽

Methane Formation ◽

External Mass Transfer ◽

Sludge Digestion ◽

Anaerobic Sludge Digestion ◽

Kinetics Of ◽

Transfer Study

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Performance and kinetics of an upflow anaerobic sludge blanket (UASB) reactor treating slaughterhouse wastewater

Journal of Environmental Science and Health Part A Environmental Science and Engineering and Toxicology ◽

10.1080/10934529409376165 ◽

1994 ◽

Vol 29 (10) ◽

pp. 2063-2085 ◽

Cited By ~ 3

Author(s):

R. Borja ◽

C.J. Banks ◽

Z. Wang

Keyword(s):

Upflow Anaerobic Sludge Blanket ◽

Uasb Reactor ◽

Anaerobic Sludge ◽

Slaughterhouse Wastewater ◽

Anaerobic Sludge Blanket ◽

Kinetics Of

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Anaerobic biodegradation of cassava wastewater under different temperatures and inoculums

Comunicata Scientiae ◽

10.14295/cs.v10i1.3009 ◽

2019 ◽

Vol 10 (1) ◽

pp. 65-76

Author(s):

Miriam Cleide Cavalcante de Amorim ◽

Paula Tereza De Souza Silva ◽

Patricia Silva Barbosa ◽

Nayara Evelyn Montefusco

Keyword(s):

Anaerobic Digestion ◽

Methane Production ◽

Semiarid Region ◽

Anaerobic Sludge ◽

Bovine Rumen ◽

Different Temperatures ◽

Influence Of Temperature On ◽

Cassava Wastewater ◽

Kinetics Of ◽

Goat Rumen

The production of starch generates, as a by-product, the cassava wastewater (manipueira), which can be treated by anaerobic digestion to provide biogas and minimize its polluting potential. The most commonly utilized biomass in the anaerobic digestion is the anaerobic sludge. The literature presents, as an alternative to sludge, bovine manure and ruminal fluids, being scarce the studies with the cassava wastewater. This research evaluated the influence of temperature on the microbial ability of cattle and goat rumen in anaerobically biodegrading the manipueira in substitution to the anaerobic sludge. The cattle and goat rumen specific methanogenic activities (SMA) were compared with that of the anaerobic sludge. Subsequently, by using the inoculum which had the best SMA results, cassava wastewater biodegradability tests were performed, investigating the kinetics of the organic matter removal and methane production at 32 ° C and 39 ° C. The bovine rumen presented better results in the SMA (0,315 g COD-CH4 g VSS.d-1) and methane production (1,026 mL). The temperature of 32 °C did not influence the activity of bovine ruminal inoculum as the kinetics of the biodegradation of the manipueira did not differ for the evaluated temperatures (0.1799 d-1 at 32°C and 0.1781 d-1 at 39°C). Bovine rumen achieved glucose reduction of 76% and 80% and methane yield of 77% and 79% for the tests at 32°C and 39°C, respectively. It is inferred that this type of inoculum might be used in reactors of anaerobic digestion processes for the treatment of the cassava wastewater at the ambient temperature of the semiarid region.

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