排序方式: 共有6条查询结果,搜索用时 0 毫秒
1
1.
Study on coagulation property of metal-polysilicate coagulants in low turbidity water treatment 总被引:2,自引:0,他引:2
INTRODUCTION Coagulation-flocculation is a major step inthe potable water treatment for removal of colloi-dal impurity. Due to the increase of water pollu-tion, the standards of drinking water supply andwastewater discharge are becoming more and morestringent, and chemical coagulants that are moreefficient in water treatment are more and moreurgently in demand. As well known, the residual Al in potablewater comes from three main sources: natural wa-ter-body, coagulants used in… 相似文献
2.
3.
河南省洛宁县森林覆被及其变化的分形分析 总被引:11,自引:2,他引:11
马建华赵庆良韩晋仙丁圣彦李爽 《资源科学》2003,25(2):14-19
该文应用盒子计数法分别计算了河南省洛宁县森林覆被类型及区域所有森林覆被空间分布的分维值,并讨论了森林覆被及其变化的分形性质。研究结果表明,森林覆被具有统计自相似性,是一类随机分形;分维是表征森林覆被及其变化空间结构信息的特征参数,值域为 < <2,在一定范围内分维值越大表明森林覆被愈复杂、愈不规则;分维值的大小与森林面积、斑块数量和平均斑块面积等项指标没有直接关系,而是三者有机结合的综合表现。 相似文献
4.
5.
6.
In order to remove the low turbidity present in surface water, a novel metal-polysilicate coagulant was used to treat the raw water taken from Tanjiang River in Guangdong Province. This study on the effects of Al/Fe molar ratio on the performance of a complex compound formed by polysilicic acid, aluminium and ferric salt (PAFS) showed that PAFS with Al/Fe ratio of 10:3 seemed to have the best coagulation performance in removing turbidity and color. Experimental results showed that under the conditions of polymerization time of 15 d, sedimentation time of 12 min, and pH of 6(8, PAFS with Al/Fe molar ratio of 10:3 had the best coagulation efficiency and lowest residual Al concentration. The turbidity decreased from 23.8 NTU to 3.23 NTU and the residual Al concentration was only 0.165 mg/L in the product water. It could be speculated that colloidal impurities and particulate Al were removed by adsorption bridging and electrical neutralization of long chain inorganic polymer coagulants. 相似文献
1