| With the water eutrophication caused b y nitrogen and phosphorus,the ecological f unctio n of water bod y is greatl y reduced, causing risks for environment. Sediment leads to secondary pollution. The importance of water sediment s ynchronous control was found. And there h as been a great breakthrough of the research of immobilized microorganism technolog y. In this thesis PSB will be the the main bod y. Adopting several kinds of carrier materials and methods, photos ynthetic bacteria are fix ed on the carrier. The removal of organic matter, nitrogen and phosphorus of water and sediment using immobilized beads were studied in laborator y ex periments. The different environment al factors and human factors impact on removal efficienc y was st udied. The main application conditions and the control parameters were determined. This paper provides theoretical and technical foundation for the application of immobilized PSB in water rest oration. The major conclusions we have drawn are as follows:(1) Photos ynthetic bacteria strains used in this paper are mostl y short rods or ovoid, 0.5-0.9?m wide, 1.2-2.0?m long. It is no spore, no capsule, unipolar flagella, can ex ercise. After a period of time, it still form a complete training, with its surface is smooth, its dispersion is good and no reunion. Immobilized carrier materials is almost of porous minerals, which has a good ads orption performance and biocompatibilit y.(2) The performance of PSB revealed that PSB immobilized optimum growth conditions are consistent with the free. The optimized ex perimental condi tions include temperature of 30 ?, p H of 7-9, light, anaerobic. And on this condition, growth activit y and the growth rate of immobilized bacteria was slightl y lower than that of suspension. The optimal water purification process condition is temperature of 30 ?, illumination of 100%, addition amount of 20 g? L- 1 and addition frequen c y of 4 d?time- 1. Under the optimum conditions, the removal rate of COD, NH3-N and TP reaching max imum about 80%. After immobilized, ran ge of its optimum temperature widen, 25 to 30 ? all have wel l removal efficiency.(3) After immobilized, bacteria can still keep the original form. After a period of time working with sediment, it can detect a large number of PSB with no obvious variation in the overl yin g water. After put into sediment, it can quickl y spread. As a r esult, obvious stratification formed between the sediment and overl yin g water. It was divided into the overl yin g water la yer and sediment la yer and a thick layer of microbial isolation layer. Under the optimum conditions of temperature of 30 ?, addition amount of 20 g?L- 1 and addition frequency of 4 d?time- 1, the removal rate of COD, NH 3-N and TP was best. Amount of sediment reduction as the additiv e quantit y increases, in 15 g·L- 1 on the amount of sediment reduction effect i s obvious. |
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