| Leachate is one kind of organic wastewater which is generated by biochemical degradation, infiltration of precipitation and groundwater seepage during the process of landfill. Leachate will adversely impact the environment, ground water and soil, which are difficult to recover. Recently, there are some purification technics and approaches for leachate are explored all around the world. However, the processing of leachate becomes a hot and difficult spot due to the fluctuation of quality and quantity of water, complicated ingredient and high level of pollution intensity. Until now, the research for leachate is still focusing on treatment process and its ecotoxicity, meanwhile the research about dislodge of salinity and the change of leachate before and after the remove are rarely reported. Ion exchange desalination is a traditional process to be used. As the ion exchange resin is applied to the salinity disposal of landfill leachate, analysis of changes of leachate disposal and phytotoxic effect make significance for innocent treatment for leachate.In the research of phytotoxic effect, barley as a model plant is now widely applied. In this study, the phytotoxic effect of landfill leachate which is treated by ion exchange resin was investigated on the barley seedlings. In this study, the effect of the leachate before and after resin treatment on the barley early growth was researched. And in the condition of same salt content, the effect of the leachate dilution and resin treatment was compared. It revealed the level of impact from resin treatment to virulence of leachate, providing a theory basement of secure disposal for leachate in the future.Currently, the gravimetric method is used for the measurement of total salt in water quality which is according to the national standard. This method is accurate, but complex, time-consuming and expensive which leads to the limitation of application. Therefore, in this study, based on the gravimetric method, the conductivity method is reported on the measurement of the total salt of landfill leachate. Compared to the gravimetric, the conductivity method has significant advantages, for instance, easy to operate and practical. In the conclusion, by using conductivity approach in the measurement of total salt in landfill leachate could realize the quick test of total salt in leachate.The results showed that:1. The correlation analysis of leachate conductivity and total salt showed a good linear relationship between them. Therefore the leachate conductivity can be substituted into the corresponding regression equation to get the total salt under certain conditions, but due to the impact of source, seasonal changes and other objective factors, the regression equation should be amended accordingly.2. The physical and chemical properties of leachate before and after the treatment with resin were studied, and the results showed that, CODCr, ammonia, water hardness have been reduced with the decline of total salt.3. The barley was treated with ion exchange effluent of leachate. The results showed that the resin can reduce the toxicity of landfill leachate, and with the increased dosage of resin, the toxicity reduced. By measuring the fresh weight and dry weight of barley, it was found that after resin treatment, the treated leachate still caused a certain degree of influence on the water metabolism in barley body.4. To further investigate the effectiveness of ion exchange effluent of ieachate, the barley was poisoned with leachate which was treated with resin, then seed germination, bud length of seedling fresh weight, dry weight was measured. It was found that when adding resin more than 60 g/L, the early growth of barley treated with resin-treated leachate was greater than the group treated with diluted leachate. This result showed that when the resin is more than 60 g/L, the resin treatment of leachate was better than dilution treatment. |
PDF Full Text Request