School of Environment, Tsinghua University, Beijing 100084, People's Republic of China.
Environ Sci Pollut Res Int. 2012 Sep;19(8):3178-84. doi: 10.1007/s11356-012-0821-4. Epub 2012 Feb 25.
Polyvinyl alcohol (PVA) has been widely used as sizing agents in textile and manufacturing industry, and it is a refractory compound with low biodegradability.
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.
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.
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.
Ionizing radiation could be used as a pretreatment technology for PVA-containing wastewater, and its combination with biological process is feasible.
聚乙烯醇（PVA）已被广泛用作纺织和制造业中的上浆剂，它是一种难生物降解的耐火化合物。
本研究旨在通过伽马射线辐照预处理含 PVA 废水，以提高其可生物降解性，并确定预处理过程中不同自由基种类的作用。
在（60）钴源站内进行伽马辐射，使用可见分光光度计分析 PVA 浓度，通过微量呼吸计测量比耗氧速率（SOUR，每克混合液挥发性悬浮固体（MLVSS）每小时消耗的氧气毫克数）。
结果表明，低初始浓度（例如 327.8mg/L）的含 PVA 废水的生物降解性可通过增加辐照剂量得到显著提高。然而，在较高初始 PVA 浓度（例如 3,341.6mg/L）和较高辐照剂量下，会观察到 PVA 凝胶形成，这会抑制好氧微生物对 PVA 的降解。然而，形成的凝胶可以通过微滤分离，从而实现超过 90%的总有机碳（TOC）去除。
电离辐射可作为含 PVA 废水的预处理技术，与生物处理相结合是可行的。
