?? 97? ?????? 32??? ???? ???? ????? ???(?????)???? ??? ?? ? ??? 11??? ?? ????? ???.

????? ??? ?? ??????????(BOD)? ?? 0.1～1.0PPM?? 1?? ??? ???? ??.

? ?????? ????? ???? ?? ????? ???? ??? ???? ??? ?. ????? ?? ?? ????? ???? ???? ??? ??? ??? ?????? ????? ???? ????? ? ???? 5?60??? ???? ??.

??? ???? “?? ??? ?? ??? ? ??? ????”? “??? ???? ?? ? ???? ???? ??? ??? ????? ??”??? ???.

▽????

△????? △????? △??? ??? ?????? △〃 ??? ???? △??? ??? ?????? △??? ??? ????? △??? ??? 12??? △??? ???? △??? ??? ???? △??? ??? ??? 99??? △??? ??? ??????.

〈??〓?????〉doyoce11@donga.com