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測量應(yīng)用案例-20210314
閱讀：159 發(fā)布時間：2021-3-10| 提 供 商 | 美國布魯克海文儀器公司 | 資料大小 | 256.8KB |
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| 資料圖片 | 下載次數(shù) | 31次 | |
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Abstract. To reduce the concentration of heavy metal ions in drinking, natural and wastewater
to the established standards, a dynamic membrane with a surface layer of cellulose acetate
particles on a nylon substrate was obtained. A dynamic membrane layer was formed from
cellulose acetate particles with sizes from 42 to 130 nm. The cellulose acetate content was
14 % by weight, upon receipt from a 10 % solution of cellulose acetate in acetone. After
applying a layer of cellulose acetate to the surface of a nylon substrate, a decrease in the
specific productivity of the membranes is observed more than 10 times due to the formation of
a dynamic layer on the surface and in the pores of the substrate. During the operation of the
membrane for 1 hour, there is a decrease in the specific productivity of the membrane by 1.5
times and an increase in the working pressure from 0.35 to 0.41 MPa by 1.2 times. A high
selectivity of the dynamic nylon-ACd membrane with respect to iron ions 96%, copper 93%
and chromium 93% was established with a specific productivity of 300 dm3/m2?h and a
pressure of 0.4 MPa. After purification of tap water with a dynamic membrane, the
concentration of heavy metal ions does not exceed the MPC for water bodies for drinking
water.