半甜欲水1V6,美女的双腿张开让男的桶

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閱讀：166 發(fā)布時(shí)間：2021-3-10

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.