Improvement of Biodegradability of PVA-containing Wastewater by Ionizing Radiation Pretreatment

Overview

Journal Environ Sci Pollut Res Int

Publisher Springer

Specialties Environmental Health
Toxicology

Date 2012 Feb 28

PMID 22367496

Citations 3

Authors

Weihua Sun

Jinping Tian

Lujun Chen

Shijun He

Jianlong Wang

Affiliations

Soon will be listed here.

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.

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