Fertile phone books

日期:2017-10-16 01:35:36 作者:牛浣 阅读:

Japanese national phone company NTT has hit on a novel use for recycled telephone directories. A clay-like waste product is left after the books are pulped, and researchers at NTT have turned the goo into balls of a microporous material (MPM) that can absorb phosphorous and nitrogen from water, at half the cost of activated charcoal. Putting hundreds of MPM balls in a polluted stream should clear away phosphates and nitrates. After use,