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Environ Sci Pollut Res Int

Title:		Improvement of biodegradability of PVA-containing wastewater by ionizing radiation pretreatment
Author(s):		Sun W; Tian J; Chen L; He S; Wang J;
Address:		"School of Environment, Tsinghua University, Beijing 100084, People's Republic of China"
Journal Title:		Environ Sci Pollut Res Int
Year:		2012
Volume:		20120225
Issue:		8
Page Number:		3178 - 3184
DOI:		10.1007/s11356-012-0821-4
ISSN/ISBN:		1614-7499 (Electronic) 0944-1344 (Linking)
Abstract:		"BACKGROUND: Polyvinyl alcohol (PVA) has been widely used as sizing agents in textile and manufacturing industry, and it is a refractory compound with low biodegradability. OBJECTIVE: The objective of this paper was to treat the PVA-containing wastewater using gamma irradiation as a pretreatment strategy to improve its biodegradability and to determine the roles of different kinds of radical species played during pretreatment. METHODS: Gamma radiation was carried out in a (60)Cobalt source station, PVA concentration was analyzed by using a visible spectrophotometer and specific oxygen uptake rate (SOUR, milligram of O(2) per gram of mixed liquor volatile suspended solids (MLVSS) per hour) was measured by a microrespirometer. RESULTS: The results showed that the biodegradability of PVA-containing wastewater with low initial concentration (e.g., 327.8 mg/l) could be improved greatly with increasing irradiation dose. However, PVA gel formation was observed at higher initial PVA concentration (e.g., 3,341.6 mg/l) and higher irradiation dose, which inhibited PVA degradation by aerobic microorganisms. However, the formed gel could be separated by microfiltration, which led to more than 90% total organic carbon (TOC) removal. CONCLUSION: Ionizing radiation could be used as a pretreatment technology for PVA-containing wastewater, and its combination with biological process is feasible"
Keywords:		"Biodegradation, Environmental/radiation effects Cobalt Radioisotopes *Gamma Rays Oxygen/metabolism Polyvinyl Alcohol/*metabolism/radiation effects Sewage/microbiology Water Pollutants, Chemical/*metabolism/radiation effects Water Purification/*methods;"
Notes:		"MedlineSun, Weihua Tian, Jinping Chen, Lujun He, Shijun Wang, Jianlong eng Research Support, Non-U.S. Gov't Germany 2012/03/01 Environ Sci Pollut Res Int. 2012 Sep; 19(8):3178-84. doi: 10.1007/s11356-012-0821-4. Epub 2012 Feb 25"