The study of critical flocculation concentration of ammonia nitrogen of colloids in the groundwater
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Abstract:
In order to study the critical flocculation concentrations of ammonia nitrogen in various kinds of colloids in the groundwater, we measured the critical flocculation concentrations of ammonia nitrogen in natural clay colloid, bentonite colloid, kaolin colloid, and natural clay colloids of different particle sizes in a batch test. Results showed that the critical flocculation concentration of ammonia nitrogen varies in different kinds of colloids. The critical flocculation concentrations of ammonia nitrogen in natural clay colloid, bentonite colloid, and kaolin colloid were 1600 mg/L, 24000 mg/L, and 8000 mg/L, respectively. Test results showed that the stability of the bentonite colloid was the strongest and was the least susceptible to ammonia nitrogen. The critical flocculation concentration of ammonia nitrogen also varies in natural clay colloids of different particle sizes. It tended to decrease with the increase of the particle size, indicating that the colloid with bigger particle size has worse stability and thus is more susceptible to ammonia nitrogen. In general, the critical flocculation concentrations of colloids are certainly associated with the type of colloid and the particle size of the colloid.
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