摘要
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6种黏土矿物及其用量对污水中可溶态N、P的吸附效果,选出吸附效果较好的一种或几种黏土矿物并确定其最佳用量,用于指导农业面源污水中可溶态N、P沉降。分别用靛酚蓝比色法、紫外分光光度法、钼蓝比色法测定铵态氮、硝态氮、磷酸根的浓度,运用SPSS软件进行方差分析和显著性检验。黏土矿物筛选结果表明,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%。黏土矿物用量实验结果表明,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%。可见,人造沸石是沉降铵态氮的最佳黏土矿物,而活性炭既是沉降硝态氮的最佳黏土矿物,同时也是沉降可溶态P的最佳黏土矿物。其最佳用量浓度分别为1.5g/L、12g/L以及2.0g/L。
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.
出处
《中国农学通报》
CSCD
北大核心
2010年第13期349-353,共5页
Chinese Agricultural Science Bulletin
基金
沿三峡水库(重大工程区)"农业面源污染防控与综合治理技术研究"之"水田生态系统拦截和消纳农业面源污染物关键技术研究与示范"(2007BAD87B10)
关键词
农业面源污染
人造沸石
活性炭
铵态氮
硝态氮
磷
non-point source pollution
synthetic zeolite
activated carbon
ammonium nitrogen
nitrate nitrogen
phosphorus
