Aerobic and anaerobic treatment of high-strength hazardous liquid wastes

1988 ◽  
Vol 17 (2) ◽  
pp. 169-188 ◽  
Author(s):  
E.S. Venkataramani ◽  
R.C. Ahlert ◽  
P. Corbo
Keyword(s):  
High Strength ◽  
Anaerobic Treatment ◽  
Liquid Wastes ◽  
Aerobic And Anaerobic

Denitrification of Landfill Leachate by the Modified Rotating Biological Contactor (RBC)

1991 ◽  
Vol 23 (7-9) ◽  
pp. 1477-1485 ◽  
Author(s):  
Masaaki Hosomi ◽  
Inamori Yuhei ◽  
Kazuo Matsushige ◽  
Ryuichi Sudo
Keyword(s):  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Removal Rate ◽  
High Strength ◽  
Anaerobic Treatment ◽  
Combination Method ◽  
Surface Loading ◽  
Rotating Biological Contactor ◽  
Volumetric Loading ◽  
Aerobic And Anaerobic

In order to remove high-strength nitrogen and organics in landfill leachate simultaneously, the modified RBC which was combined with the standard RBC and the anaerobic biofilter was proposed. The treatability for actual landfill leachate of the standard RBC and the modified RBC was evaluated. The capability of COD removal in the modified RBC is much greater than that in the standard RBC, although both RBCs showed a BOD removal rate of more than 95%. This suggested that the combination method of aerobic and anaerobic treatment was effective in reducing refractory organic compounds. The nitrogen removal in the modified RBC was about 90% compared to 50% in Che standard RBC. The modified RBC had the advantage of nitrogen removal because nitrification and denitrification proceeded efficiently, even if a carbon source was not added. The performance of the modified RBC was superior to that of the standard RBC in both BOD surface loading and BOD volumetric loading.

Soluble microbial product formation during biological treatment of fermentation industry effluent

2000 ◽  
Vol 42 (1-2) ◽  
pp. 111-116 ◽  
Author(s):  
O. Goorany ◽  
I. Oztürk
Keyword(s):  
Molecular Weight ◽  
Biological Treatment ◽  
High Strength ◽  
Anaerobic Treatment ◽  
Product Formation ◽  
Microbial Product ◽  
Treatment Processes ◽  
Industry Effluent ◽  
Aerobic And Anaerobic ◽  
Raw Wastewater

The most important factor that affects the quality of effluents and overall organic matter removal in biological treatment processes is the presence of soluble microbial products (SMP) that are produced during biological treatment and remain in effluent. High strength wastewater from fermentation industry (FIE) was used as a slowly degradable substrate to investigate SMP formation in aerobic and anaerobic treatment. For SMP determination which forms a major part of residual soluble COD of the wastewater, the initial inert soluble COD (SI) was determined. It was found that SI/So is 0.122 and 0.164 for aerobic and anaerobic processes, respectively. During aerobic treatment of FIE for initialCOD (So) values varying between 1540–6645 mg COD/L, SMP are expected to vary within the range of 12.5–8.6% of So, respectively. In anaerobic treatment of the FIE, for values of 2670–6585 mg COD/L, SMP are expected to vary within the range of 9.8–6.2% of So, respectively. Molecular weight distribution analyses of raw wastewater, aerobic and anaerobic treatment effluent indicate that in both systems the effluent of FIE presents similar molecular weight fractions and are very high compared to raw wastewater.

Biotransformation of nitrocellulose under methanogenic conditions

1996 ◽  
Vol 34 (5-6) ◽  
pp. 327-334 ◽  
Author(s):  
David L. Freedman ◽  
Bryan M. Caenepeel ◽  
Byung J. Kim
Keyword(s):  
Biological Treatment ◽  
Enrichment Culture ◽  
Basal Medium ◽  
Anaerobic Biodegradation ◽  
Anaerobic Treatment ◽  
Acid Digestion ◽  
Energetic Compounds ◽  
Nitrate Ester ◽  
Digestion Technique ◽  
Aerobic And Anaerobic

Treatment of wastewater containing nitrocellulose (NC) fines is a significant hazardous waste problem currently facing manufacturers of energetic compounds. Previous studies have ruled out the use of biological treatment, since NC has appeared to be resistant to aerobic and anaerobic biodegradation. The objective of this study was to examine NC biotransformation in a mixed methanogenic enrichment culture. A modified cold-acid digestion technique was used to measure the percentage of oxidized nitrogen (N) remaining on the NC. After 11 days of incubation in cultures amended with NC (10 g/L) and methanol (9.9 mM), the % N (w/w) on the NC decreased from 13.3% to 10.1%. The presence of NC also caused a 16% reduction in methane output. Assuming the nitrate ester on NC was reduced to N2, the decrease in CH4 represented almost exactly the amount of reducing equivalents needed for the observed decrease in oxidized N. An increase in the heat of combustion of the transformed NC correlated with the decrease in % N. There was no statistically significant decrease in % N when only NC was added to the culture, or in controls that contained only the sulfide-reduced basal medium. The biotransformed NC has a % N comparable to nonexplosive nitrated celluloses, suggesting that anaerobic treatment may be a technically feasible process for rendering NC nonhazardous.

scholarly journals Biodegradation of low molecular weight polyacrylamide under aerobic and anaerobic conditions: effect of the molecular weight

2020 ◽  
Vol 81 (2) ◽  
pp. 301-308 ◽  
Author(s):  
Wenzhe Song ◽  
Yu Zhang ◽  
Amir Hossein Hamidian ◽  
Min Yang
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Carbon Chain ◽  
Anaerobic Treatment ◽  
Low Molecular Weight ◽  
Amino Groups ◽  
Molecular Weights ◽  
Weight One ◽  
Hydrolysis Of ◽  
Aerobic And Anaerobic

Abstract The biodegradation of polyacrylamide (PAM) includes the hydrolysis of amino groups and cleavage of the carbon chain; however, the effect of molecular weight on the biodegradation needs further investigations. In this study, biodegradation of low molecular weight PAM (1.6 × 106 Da) was evaluated in two aerobic (25 °C and 40 °C) and two anaerobic (35 °C and 55 °C) reactors over 100 days. The removal of the low molecular weight PAM (52.0–52.6%) through the hydrolysis of amino groups by anaerobic treatment (35 °C and 55 °C) was much higher than that of the high molecular weight (2.2 × 107 Da, 11.2–17.0%) observed under the same conditions. The molecular weight was reduced from 1.6 × 106 to 6.45–7.42 × 105 Da for the low molecular weight PAM, while the high molecular weight PAM declined from 2.2 × 107 to 3.76–5.87 × 106 Da. The results showed that the amino hydrolysis of low molecular weight PAM is easier than that of the high molecular weight one, while the cleavage of its carbon chain is still difficult. The molecular weights of PAM in the effluents from the two aerobic reactors (25 °C and 40 °C) were further reduced to 4.31 × 105 and 5.68 × 105 Da by the biofilm treatment, respectively. The results would be useful for the management of wastewater containing PAM.

scholarly journals Methanogenic Microorganisms in Industrial Wastewater Anaerobic Treatment

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1546
Author(s):  
Monika Vítězová ◽  
Anna Kohoutová ◽  
Tomáš Vítěz ◽  
Nikola Hanišáková ◽  
Ivan Kushkevych
Keyword(s):  
Wastewater Treatment ◽  
Industrial Wastewater ◽  
Methanogenic Archaea ◽  
High Strength ◽  
Anaerobic Treatment ◽  
Microbiome Composition ◽  
Anaerobic Wastewater Treatment ◽  
The Past ◽  
Anaerobic Reactors ◽  
Anaerobic Environment

Over the past decades, anaerobic biotechnology is commonly used for treating high-strength wastewaters from different industries. This biotechnology depends on interactions and co-operation between microorganisms in the anaerobic environment where many pollutants’ transformation to energy-rich biogas occurs. Properties of wastewater vary across industries and significantly affect microbiome composition in the anaerobic reactor. Methanogenic archaea play a crucial role during anaerobic wastewater treatment. The most abundant acetoclastic methanogens in the anaerobic reactors for industrial wastewater treatment are Methanosarcina sp. and Methanotrix sp. Hydrogenotrophic representatives of methanogens presented in the anaerobic reactors are characterized by a wide species diversity. Methanoculleus sp., Methanobacterium sp. and Methanospirillum sp. prevailed in this group. This work summarizes the relation of industrial wastewater composition and methanogen microbial communities present in different reactors treating these wastewaters.

Evaluation of Alternatives to Conventional Disc Support Media for Rotating Biological Contactors

1990 ◽  
Vol 22 (1-2) ◽  
pp. 113-117 ◽  
Author(s):  
A. J. Ware ◽  
M. B. Pescod ◽  
B. Storch
Keyword(s):  
Pilot Scale ◽  
Anaerobic Treatment ◽  
Full Scale ◽  
Aerobic Treatment ◽  
Support Material ◽  
Rotating Biological Contactors ◽  
Biofilm Support ◽  
Aerobic And Anaerobic

A variety of biofilm support media for rotating biological contactors, both aerobic and anaerobic. are reviewed in the light of experience gained from laboratory. pilot-scale and full-scale operations. Currently there is no clear economically superior replacement for conventional HDPE moulded discs for aerobic treatment plants. As little anaerobic full-scale operational work has been carried out it has been speculated that random-packed media and twin-walled polycarbonate sheets could provide a substitute support material in anaerobic treatment units.

Anaerobic and Aerobic Treatment for AOX Removal

1994 ◽  
Vol 29 (5-6) ◽  
pp. 149-162 ◽  
Author(s):  
John F. Ferguson
Keyword(s):  
Biological Treatment ◽  
Anaerobic Treatment ◽  
Reductive Dehalogenation ◽  
Aerobic Treatment ◽  
Abiotic Degradation ◽  
In Series ◽  
Kraft Mill ◽  
Significant Chemical ◽  
Aox Removal ◽  
Aerobic And Anaerobic

A two-year study has focused on AOX removal from bleaching wastewaters in anaerobic and aerobic biological treatment, using bench scale bioreactors operated in parallel and in series. Significantly higher removals have been found in anaerobic than in aerobic treatment. Earlier work with dilute kraft bleaching wastes has been extended in additional laboratory tests and at a nearby kraft mill. 50-75% fractions of bleaching wastes were treated. Toxicity in the anaerobic process was encountered at 85% bleach waste fractions. Total AOX removal experienced in aerobic treatment is 30-35%, in anaerobic treatment 40-45%, and in an anaerobic/aerobic sequence 50-55%. Percentage removals were not sensitive to the fraction of bleaching wastewater. Several process modifications were attempted to try to obtain higher removals with only marginal success. Studies at a kraft mill confirmed the AOX removals that had been found in lab studies. AOX removal occurs by several mechanisms. There is a very significant chemical or abiotic degradation that occurs after neutralization, perhaps enhanced by reductants or other inorganic salts. Biological processes are much more significant in anaerobic than in aerobic treatment. Anaerobic reductive dehalogenation affects specific chlorinated compounds and catalyzed AOX degradation is facilitated by reduced coenzymes that are produced by bacteria. Removal by sorption or insolubilization is relatively minor in aerobic and anaerobic processes.

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