α-淀粉酶对地下水反硝化中SOC材料性能的改进

Nitrate pollution problems of groundwater have drawn comprehensive attention in many parts of the world for their perennial and potential danger to human health. In-situ biological denitrification was considered to be a promising method to remove excessive nitrate, but restricted by lack of carbon source materials. This research was designed to manufacture and identify SOC (Slow-releasing Organic Carbon-source) materials as appropriate electron donor used in PRB (Permeable Reactive Barrier). GPVAS and GEPVAS series were produced by blending starch and PVA (Poly Vinyl Alcohol) together, and their performance was detected through static batch experiments. The results showed that the carbon releasing process followed the law of second order kinetics, with the parameters Cm and K representing the releasing capability and speed, which were both the lowest of GPVAS-40. Both Cm and K values would ascend rapidly with augmenting of α-amylase content, and K was linearly correlated to U (activity of amylase) when U was lower than 0.05u/g. Consequently, the process was controllable, which solved the problem of COD residue to some extent. SOC materials were suggested to be potential and suitable carbon sources for in-situ denitrification treatment.