地下水中胶体临界絮凝铵氮浓度研究

The study of critical flocculation concentration of ammonia nitrogen of colloids in the groundwater

为了了解地下水中各种类铵氮临界絮凝铵氮浓度的差别,采用批试验,对天然黏土胶体、膨润土胶体、高岭土胶体和不同粒径的天然黏土胶体的临界絮凝铵氮浓度进行了测定。结果表明:不同种类胶体的临界絮凝铵氮浓度有差别,天然黏土胶体、膨润土胶体、高岭土胶体的临界絮凝铵氮浓度分别为1 600mg/L,24 000mg/L和8 000mg/L。试验结果表明膨润土的稳定性最强,最不易受到铵氮的影响。不同粒径天然黏土胶体的临界絮凝铵氮浓度也不同,但是随粒径的变化呈现出一定的规律性,随着粒径的增大临界絮凝铵氮浓度减小,说明粒径较大的胶体的稳定性越差,越易受到铵氮的影响。总体而言,胶体的临界絮凝铵氮浓度和胶体种类和胶体粒径都有一定的相关关系。

In order to study the critical flocculation concent rations of ammonia nitrogen of various kinds of colloids in the ground water,the critical flocculation concentr ations of ammonia nitrogen of natural clay colloid,bentonitegel,kaolin colloid and different particle size of natural clay colloid were determined by the batch test.Results show that the critical flocculation concentrations of ammonia nitrogen of different kinds of colloids have differences.The critical flocculation concentrations of ammonia nitrogen of natural clay colloid,bentonitegel,kaolin colloid were1600mg/L,24000mg/L and8000mg/L,r espectively.The results show that the stability of the bentonite colloid was the strongest and it was least susceptible to be influenced by ammonianitrogen.The critical flocculation concentrations of ammonia nitrogen of natural clay colloids of different size have difference.But with the change of particle size,the critical flocculation concentrations of ammonia nitrogen present a certain regularity thatthe critical flocculation concentration of ammonianitrogen decreases with the increase of particle size,and the colloid with big gerpar ticle size had worse stability so more susceptible to be influenced by ammonianitrogen.In general,the critical flocculatio nco ncentrations of colloidsare certainly released with the types of colloids and the particle size of colloids.