EPA Site Demonstration of Bio Trol Aqueous Treatment System

Stinson, Mary K.; Skovronek, H.S.; Chresand, Thomas J.

doi:10.1080/10473289.1991.10466839

Cited by 15 publications

(7 citation statements)

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“…Aerobic organisms such as Flavobacterium spp. (8,34,37) and Rhodococcus spp. (2,12,35) have been successfully used in pilot-scale and field studies for the treatment of PCP-contaminated wastewater and groundwater.…”

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confidence: 99%

Performance of anaerobic granules for degradation of pentachlorophenol

Bhatnagar

Zeikus

1993

Appl Environ Microbiol

108

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Anaerobic granules degrading pentachlorophenol (PCP) with specific PCP removal activity up to 14.6 mg/g of volatile suspended solids per day were developed in a laboratory-scale anaerobic upflow sludge blanket reactor at 28°C, by using a mixture of acetate, propionate, butyrate, and methanol as the carbon source. The reactor was able to treat synthetic wastewater containing 40 to 60 mg of PCP per liter at a volumetric loading rate of up to 90 mg/liter of reactor volume per day, with a hydraulic retention time of 10.8 to 15 h. PCP removal of more than 99%o was achieved. Results of adsorption of PCP by granular biomass indicated that the PCP removal by the granules was due to biodegradation rather than adsorption. A radiotracer assay demonstrated that the PCP-degrading granules mineralized [14CJPCP to 14CH4 and 14Co2. Toxicity test results indicated that syntrophic propionate degraders and acetate-utilizing methanogens were more sensitive to PCP than syntrophic butyrate degraders. The PCP-degrading granules also exhibited a higher tolerance to the inhibition caused by PCP for methane production and degradation of acetate, propionate, and butyrate, compared with anaerobic granules unadapted to PCP. * Corresponding author. 389 ules on a synthetic wastewater containing PCP, acetate, propionate, butyrate, and methanol in a laboratory-scale UASB reactor at 28°C (5, 6). The maximum PCP removal rate of the granules was as high as 14.6 mg/g of volatile suspended solids (VSS) per day, and a stable volumetric PCP removal rate of 90 mg of PCP per liter per day was achieved. The purpose of this article was to examine the feasibility of the development of methanogenic granules with high dechlorinating activity and to investigate the performance of the granules in treating wastewaters containing high PCP concentrations in a laboratory-scale UASB reactor system. MATERIALS AND METHODS Chemicals and gases. All chemicals (analytical grade) except PCP were obtained from Sigma Chemical Co. (St. Louis, Mo.); PCP was obtained from Aldrich Chemical Co. (Milwaukee, Wis.). Nitrogen gas and gas mixtures of N2-CO2 (95:5 and 70:30) were obtained from Linde Division, Union Carbide Corp. (Warren, Mich.), and passed over heated (370°C) copper filings to remove traces of 02. Analytical methods. Methane, methanol, and volatile fatty acids (VFA) were determined by using gas chromatography as described elsewhere (43, 44). PCP in solution was determined with high-performance liquid chromatography (HPLC). Samples (1.0 ml) were mixed with 0.5 ml of acetonitrile on a vortex mixer, centrifuged for 5 min at 5,500 x g with an Eppendorf 5415 centrifuge (Brinkmann Instruments, Inc., Westbury, N.Y.), and filtered through 0.45-,um-pore-size syringe filters (Acrodisc LC13; Gelman Sciences Co., Ann Arbor, Mich.). A Waters HPLC system, consisting of the model 501 pump, the Lambda-Max model 481 UV detector, and the model 740 data module, was used. Samples were injected by using a Rheodyne 7010 injector fitted with a 50-,ul loop. Separation was accomplished with a ...

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confidence: 99%

Performance of anaerobic granules for degradation of pentachlorophenol

Bhatnagar

Zeikus

1993

Appl Environ Microbiol

108

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“…This process involves the NaOH extraction of900b of the preservatives from the u ood chips, the recover!-of the PCP and creosote, the composting of the chips and the biological treatment of the water containing trace amounts of creosote and PCP b\an immobilized aerobic biological reactor. Tcchnologies which use physical and chemical processes to remove PCP and other contaminants ha\-e also been supplied to contaminated soils (Stinson et a / . 1991(Stinson et a / .…”

Section: Discussionmentioning

confidence: 99%

Anaerobic biodegradation of pentachlorophenol in a liquor obtained after extraction of contaminated chips and wood powder

et al. 1997

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Recovery of 97.5% of the pentachlorophenol (PCP) in contaminated wood powder was obtained after extraction with 0.1% KOH solution at 60 degrees C for 75 min. Extraction with NaOH and Na2CO3 was less effective than KOH. The neutralized extract was treated using a methanogenic consortium in an upflow anaerobic fixed-film reactor. The reactor was operated at 29 degrees C for over 600 d. The best performance of the reactor was observed when the PCP liquor was supplemented with glucose and formate. Complete dechlorination of PCP and phenol removal was obtained for a PCP loading rate of 13.3-18.0 mg l(-1) of reactor volume d(-1) with recirculation of the effluent and a hydraulic retention time (HRT) of 0.5-0.6 d.

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“…In attached systems contaminated wastewater is passed and circulated through an inert support matrix which aerobically degrades water contaminants. Such attached systems are mainly consists of up flow fixed film bioreactors, rotating biological contactors (RBCs), and trickling filters (Stinson et al 1992). …”

Section: Bioreactorsmentioning

confidence: 99%