Title: Improvement of Chlorination technology of permanently effective phosphorous and its waste water treatment
Application Number: 87102556 Application Date: 1987.04.02
Publication Number: 1021364 Publication Date: 1988.10.12
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C05C9/00
Applicant(s) Name: State Qing-dao Pesticide Factory Address:
Inventor(s) Name:
Attorney & Agent: WANG HONGSHU
Abstract:
     This invention relates to a technology of treetment of waste water in the course of operation by improvement of chlorination technique. During chlorination, aqueous solution of urea-ammonium chloride (or urea-potassium chloride) is used in place of urea-sodium chloride in original technology. The waste water produced in production is neutralized with aqueous ammonia, then concentrated by reducing pressure, and solid crystal is obtained by crystallization and separation. The waste water can be used in preparation of aqueous solution of urea-ammonium chloride (or urea-potassium chloride), the residual liquor may also be used as nitrogen (or potassium) fertilizer. The mother liquor is recycled by evaporation, and the minimal amount of residues may be removed by burning. Said technology of this invention does not influence.
Time: 4