| With the continuous development of industry and improvement of the soci al technology, organic pollutants, heavy metals and other toxic harmful substa nces to the environment pollution is becoming more and more serious. Due to the life waste water and industrial effluent emissions, water pollution has aro used common concern in the world. In the real sense, the single water pollu tion is not possible, which is always accompanying with implications. In recen t years, the combined pollution containing heavy metals or organic matter air eady have been carried out and obtained the certain result at home and abroad .But there is little research on combined pollution of heavy metals and organi c matter. Urban domestic wastewater, sewage treatment plant sludge and indus trial waste water, in most cases,are organic and inorganic compound pollution, compound pollution of heavy metals and organic matters in wastewater, for fu ture development has a very important significance. Using immobilized micro organism method of heavy metal ions in water and organic matter removal, wit h high performance, fast adsorption speed, easy recovery and low price advant age, and caused concern at home and abroad.Penicillium simplicissimum exists in the air, soil, and it grows fast, culti vated simply, which can be used for large-scale production. The study foun d, Penicillium sp. have strong adsorption effect respectively in the waste wate r of heavy metals and phenol adsorption. To further explore the immobilize d Penicillium sp., this study adopts a newgood carrier--magnetite particles fi xed Penicillium sp., for the treatment of combined pollution of Cd and phen ol to investigate the performance of simultaneous removal of Cd2+, and pheno 1 in solution, and the effect of temperature,time, pH, value, concentration on the adsorption effect.The research indicated that, the adsorption experiments were carried out under different pH values, the optimal pH adsorption of phenol and Cd2+value was both about 5. When the pH is 5, the adsorbent in a single Cd2+ solution on Cd2+removal rate was 79.23%; adsorbent for the removal of phenol in phenol solution in a single rate of 68.75%; adsorption on Cd2+ and phenol compound in the solution of Cd2+ and phenol removal rate respectively is 93.2% and 91.7%.Effect of time on adsorption can be divided into two processes:first is the rapid accumulation of surface, and the second is the accumulation of slow balance. Whether it is the Cd2+ of the solution, and phenol, at the beginning of the period, the concentration decreased rapidly, and after a period of time, tends to be stable.Too high or too low temperature of adsorbent has an effect on the adsorption process, because the adsorption process itself is an exothermic reaction. The optimum temperature of adsorption of phenol and Cd2+ by Magnetic particles immobilized Penicillium sp. about 40?The use of Langmuir model and the Freundlich model is applied to fit the adsorption of phenol and Cd2+. The adsorption of Cd2+and phenol by magnetic particles fixed Penicillium sp. were fitted to the Langmuir isotherm model. The maximum adsorption, Qmax,of phenol and Cd2+ adsorption were 326.45mg/g and 170.52mg/g, and the adsorption potential and performance of adsobent is very strong.Acceleration from rest, adsorption capacity gradually increased and the speed of 150r/min is the maximum adsorption amount, but higher than the adsorption efficiency of 150r/min decreased.Generally speaking, the higher speed, the better adsorption effect on Cd2+ and phenol, but should not be too fast, and the load of cell separation.The coexistence of Cd2+ and phenol in solution on the adsorption is promoted.In accordance with the desorption of Cd2+ and phenol solution by lmol/L HC1, the magnetic particles immobilized Penicillium sp. still has good adsorption effect, and the results show that the magnetic particles immobilized Penicillium sp. is a new type of adsorbent. |
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