Immobilized Atrazine Degrading Bacteria by Different Material

The research chose the alginate sodium and PVA as the materials to immobilize the atrazine degrading bacteria. Four methods were adopted: alginate sodium adsorption method, alginate sodium embedding method, PVA boric cross linking method and PVA freezing method. The degrading effects and the characteristics of the atrazine degrading bacteria in the two materials were studied respectively. The result showed that the alginate sodium embedding method was the best, the most suitable temperature for the two strains was 30°C, and the most suitable pH value for the strains were among 4 to 7 in the condition of carbon source, and the most suitable pH value for the strains which used atrazine as the sole carbon and nitrogen source were 4-6. When the immobilized atrazine degrading bacteria J₂ (cultured in the carbon source condition) and J₆ (cultured in the condition which uses atrazine as the sole carbon and nitrogen sources), which immobilized by the alginate sodium embedding method were put into the soil, the degradation rate reached more than 95%.