粘土矿物对污水中可溶态N、P的吸附研究

在室内模拟条件下，研究了活性炭、高岭土、人造沸石、蛭石、珍珠岩、蒙脱石共六种粘土矿物及其用量对污水中可溶态N、P的吸附效果。它们对铵态氮的沉降率分别是：1%，4%，78%，11%，2%，26%；对硝态氮的沉降率分别是：32%，6%，4.5%，3.6%，0.8%，56%；对可溶态P的沉降率分别是：35%，-22%，9%，11.7%，3.6%，16.8%。结果表明，人造沸石是沉降铵态氮的最佳粘土矿物，而活性炭既是硝态氮的最佳粘土矿物，同时也是可溶态P的最佳粘土矿物。综合去除率和经济效益，吸附铵态氮，最佳的沸石浓度1.5g/L，单位吸附量11.8mg/g，吸附率59%；吸附硝态氮，最佳的活性炭浓度为12g/L，单位吸附量0.108mg/g，吸附率51%；吸附磷酸根，最佳的活性炭浓度为2.0g/L，单位吸附量0.26mg/g，吸附率26%。

Research about clay minerals on removal soluble Nitrogen and Phosphorus in polluted water

Through a series of indoor simulation tests, the removing study on soluble nitrogen and phosphorus in polluted water according to the different sorts and amounts of six clay minerals including activated carbon, kaoline, synthetic zeolite, vermiculite, perlite and montmorillonite have been carried out. Then elected one or several clay minerals with better adsorption and determined its optimal dosage, for used to guide the soluble N, P deposition of the agricultural non-point source waste water. With Indophenol Blue Method, UV-Vis speetrophotometry, molybdenum blue spectrophotometry method respectively to analysis the concentration of the ammonium nitrogen, the nitrate nitrogen and the soluble phosphorus, through using the SPSS software to variance and significance tests. Correspondingly, selection experiments of clay minerals showed that the percent of removing the ammonium nitrogen was 1%, 4%, 78%, 11%, 2%, 26% ; The percent of removing the nitrate nitrogen was 32%, 6%, 4.5%, 3.6%, 0.8%, 56% ; The percent of removing the soluble phosphorus was 35%, -22%, 9%, 11.7%, 3.6%, 16.8%. Integrated removal efficiency and economic benefits, the concentration experiments results showed removing the ammonium nitrogen, the best concentration of the synthetic zeolite was 1.5 g/L, the unit amount of adsorption was 11.8 mg/g, the adsorption rate is 59%. For removing the nitrate nitrogen, the best concentration of the activated carbon was 12 g/L, the unit amount of adsorption was 0.108 mg/ g, and the adsorption rate was 51%. For removing the soluble phosphorus, the best concentration of the activated carbon was 2.0 g/L, the unit amount of adsorption was 0.26 mg/g, and the adsorption rate was 26%. So the results showed that the synthetic zeolite is the best flocculating agent for ammonium nitrogen, Activated carbon was the best flocculating agent for nitrate nitrogen and soluble phosphorus. The optimal usage concentrations respectly were 1.5 g/L, 12 g/L and 2.0 g/L.