| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to discharge a resin waste liquid, which is obtained by removing an uncured resin from a photosensitive resin plate containing at least one ionic hydrophylic group represented by a specific formula by a developing soln., to sewerage by compounding a canionic flocculant and a polymeric water absorbable resin with the resin waste liquid. SOLUTION: A waste liquid obtained by removing an uncured resin from a photosensitive resin plate containing at least one ionic hydrophilic group represented by COOM, SO3M, SO4M, nPO(OM)n or O3-nPO(OM)n (wherein M is a hydrogen atom and (n) is 1 or 2) by a developing soln. is stirred and a polymeric cationic flocculant comprising a dimethylamine/epichlorohydrin copolymer is added to the waste liquid under stirring to generate flocs and stirring is continued in order to further completely react the treatment agent to float small sludge low in viscosity. This sludge-containing waste liquid is charged in a filtering treatment tank to separate sludge. |
