Optimization and application of powdered activated carbon enhanced for removal of 2-methylisoborneol in conventional drinking water treatment processes
The Standards for drinking water quality(GB 5749-2022)has adjusted 2-methyl-isoborneol(2-MIB)to an extended water quality indicator with a limit value of 10 ng/L,which was officially implemented on April 1,2023.To ensure that the effluent quality meets the new national standards,production tests for the removal of 2-MIB carried out in S Water Plant.It shows that conventional water treatment plants can reduce 2-MIB by 12-15 ng/L through enhanced biological action,but when the raw water 2-MIB exceeds 25 ng/L,Powdered activated carbon needs to be added to enhance the removal of 2-MIB.The results of the isothermal adsorption test indicate that powdered activated carbon meeting both an iodine value of ≥950 mg/g and a methylene blue value of ≥190 mg/g exhibits a significant adsorption effect on 2-MIB;the adsorption efficiency of pow-dered activated carbon decreases with the increase of the one-time addition amount.When the total addition amounts are 50、40、and 30 mg/L,the multi-point addition method can improve the adsorp-tion by 18.4％,15.3％,and 39.6％respectively compared to the single-point addition in raw wa-ter.To solve the impact of multi-point addition,especially pre-filtration addition,on turbidity,powdered activated carbon with a particle size concentrated between 200 to 400 mesh should be se-lected,and the proportion of particles smaller than 400 mesh should be less than 5％.
NETL
NSTL
万方数据
