摘要
采用混凝沉淀-超滤工艺对微污染原水进行试验,对组合工艺的除污染特性进行了研究。结果表明,组合工艺对浊度、颗粒物和藻类的去除效果非常好。出水浊度稳定在0.1NTU以下,水中粒径〉2μm的颗粒数约19+/mL,藻类平均数量约为2.2×10^4个/L。在去除有机物方面,组合工艺对高锰酸盐指数、UV254和DOC的去除率分别为38.0%、15.2%和32.碱,其中对高锰酸盐指数的去除效果较为突出,出水高锰酸盐指数浓度为2.69~2.87mg/L。组合工艺去除的有机物是分子量大于3KD的大分子有机物,对小分子有机物去除效果不明显。其中,混凝沉淀主要去除了水中的疏水性有机物和亲水荷电有机物,超滤膜去除的有机物则以亲水中性有机物为主。在工艺运行期间,超滤膜的跨膜压差增加了约12.3%,跨膜压差的升高主要由被超滤膜吸附的小分子有机物产生。
A process of coagulation/sedimentation/ultrafiltration was used for the treatment of micro-polluted source water, and the pollutants removal was investigated. Results showed that the process had a high removal efficiency for turbidity, particles and algae. The effluent turbidity was below 0.1NTU, the number of particle bigger than 21xm was about 19counts/mL, and the algae were 2.2×10^4 counts/L. In organics removal, the process reduced 38%, 15.2% and 32.6% of CODe,, UV254 and DOC respectively. It had a prominent high removal rate for CODMn, and the effluent CODMn was 2.69 -2.87mg/L. The combined process removed most organics with molecular weight of more than 3KD, and the small organics was difficult to be removed. The coagulation/sedimentation process removed most hydrophobic organics and hydrophilic polar organics, while the ultrafiltration mainly removed hydrophilic neutral organics. The trans-membrane pressure increased about 12.3% during the process operation, which was caused by the adsorption of small organics.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2009年第12期71-74,共4页
Environmental Science & Technology
关键词
有机物
混凝
跨膜压差
ultrafiltration
organics
coagulation
trans-membrane pressure