以Fe0为反应介质,以三氯乙烯(TCE)为目标污染物,采用批试验方法,研究了投加量、粒径及酸洗预处理对Fe0去除水中三氯乙稀的影响.结果表明:在试验范围内,Fe0投加量越大,Fe0对TCE的去除效果越好,反应速率越快；减小Fe0粒径,有利于Fe0对TCE的还原脱氯；酸洗预处理可以明显提高Fe0对TCE的去除效果.

A kind of adsorbent is made by coating chitosan on the surface of fly ash,study the adsorption efficiency of phosphorus under static conditions as well as the thermodynamics of the adsorptions.Equilibrium datas preferably follow the Langmuir and Freundlich model,while the Langmuir isotherm model reflect the isotherm data better than the Freundlich isotherm model.The phosphorus adsorption by the fly ash-chitosan adsorbent is endothermic in nature and is accompanied with an increase in entropy and a decrease in gibbs energy ranging from 20 ℃ to 35 ℃,and the numerical values of sorption gibbs energy is 44.36 kJ/mol.

Phosphorus is the limiting factor for eutrophication,at the same time,coal is the primary energy in our country,so produce large amounts of fly ash per year;chitosan exists widely in nature,and applicated widely in water treatment.Fly ash-chitosan adsorbent can not only reduce pollutants in water,low cost,low energy consumption,but also make solid waste can be used effectively.A kind of adsorbent is made by coating chitosan on the surface of fly ash,the adsorptivity toward P from aqueous solution is studied.The main factors,such as pH value,adding quantity of adsorbent,were discussed to the removal efficiency of P.Further more,the optimal experiment condition has been defined.The results of the test show:when the adding quantity of adsorbent fly ash is 6 g/L,temperature and time of adsorption are separately 30℃ and 30 min,the removal efficiency of P can reach about 90%.

[Objective] The aim was to research the removal of trichloroethylene(TCE)by Fe0.[Method] Influences of Fe0 purity,particle size,amount,acid-washing pretreatment and the different pH values on reductive dechlorination of TCE in water solution by cheap iron powers were studied with the method of batch experiment.[Result] The results indicated that better removal efficiency of TCE was obtained with higher Fe0 purity and smaller Fe0 size.With more Fe0 amount was added,higher removal efficiency of TCE was got.Removal efficiency of TCE was improved obviously by acid-washing pretreatment.Under the test conditions,removal efficiency of TCE at different pH values were:pH=6>pH=7>pH=8.That is to say the acid condition is better for the removal of TCE by Fe0.[Conclusion]The result of the research can provide theoretical basis for site remediation technologies of TCE pollution in groundwater.

Effects of different perchloroethylene(PCE)concentration on biological indexes of soybeans seedlings were studied by using simulated experiment in laborotary.Results showed the contents of MDA、O-·2,proline and GSH in soybean seedlings all increased as the PCE stress strenthened,and obvious dose-effect relationships between them were found.The proline and GSH contents increased evidently when PCE concentrations were above 0.30 mg·kg-1.When PCE concentrations were above 30.00 mg·kg-1 the O-·2 and MDA contents increased evidently,and the lipid peroxidation of soybean seedlings strengthened.It was also showed that the activity of SOD and CAT were activated in lower PCE stress,and decreased when PCE concentrations were above 0.30 mg·kg-1.

A bench-scale experiment was conducted to examine removal of chlorinated hydrocarbons, e.g, trichloroethylene ( TCE) and tetrachloroethylene ( PCE) from water by zero-valent iron. The result indicates that zero-valent iron with purer quality and smaller particle size brings about better removals of TCE and PCE and dosage of zero -valent iron is also proportional to the removals. Zero-valent iron’s removal of TCE is better than that of PCE. When both TCE and PCE co-exist in the solution the removals decline due to the competitiveness with each other as to the reaction sites of the iron particles surface.

Effects of different trichloroethylene (TCE) concentration on chlorophyll content,the superoxide dismutase (SOD)and catalase(CAT)activity of wheat,the activity of soil catalase and soil respiration were studied by using simulated experiment in laboratory. Compared with the control group,the higher concentration of TCE inhibited the synthesis of the wheat chlorophyll,and the inhibition became stronger as pollutant concentration became higher. With increase in the concentration of TCE,SOD and CAT activity have showed the trend of increased first then decreased on different degrees. The inhibition of trichloroethylene on soil catalase activity would recover to control level as the time lasted,the correlation of concentration and catalase activity was not evident. TCE over 4.00mg/kg inhibited soil respiration obviously,the dose-effect correlation of TCE concentration and soil respiration was evident,and the inhibition on soil respiration had inhibit-comeback process.

通过批实验，利用廉价铁粉对水中三氯乙烯进行还原脱氯，研究了Fe0的纯度、粒径、投加量、酸洗预处理及不同的pH值条件对三氯乙烯去除的影响。结果表明：(1) Fe0的纯度越高，粒径越小，三氯乙烯的去除效果越好；(2)在实验范围内，Fe0的投加量越大，三氯乙烯的去除效率越高；(3)酸洗预处理可以明显提高Fe0对三氯乙烯的去除率；(3)在实验范围内，pH值对Fe0去除三氯乙烯的影响为：pH=6> pH=7> pH=8，说明偏酸性的条件有利于Fe0对三氯乙烯的去除。研究的结果将为地下水三氯乙烯污染的场地修复技术提供理论基 础。