原文传递
Cost-Effective Volume Reduction of Silica-Saturated RO Concentrate. Desalination and Water Purification Research and Development Program Report No. 125.
| 题名： | Cost-Effective Volume Reduction of Silica-Saturated RO Concentrate. Desalination and Water Purification Research and Development Program Report No. 125. |
| 作者： | targuin, a. j. |
| 关键词： | concentrate injection, volume reduction, deep-well injection, reverse osmosis, data analysis, economic analysis |
| 摘要： | This project was undertaken to investigate reduction of silica-saturated reverse osmosis (RO) concentrate via lime treatment and ion exchange softening and to find possible uses for the sludge solids that are generated during the lime treatment process. Laboratory studies regarding deep-well injection of the concentrate were also conducted. The results from the lime-treatment studies showed that the concentrate volume could be reduced by up to 70% through second-pass RO treatment, thereby raising the overall recovery to 96% without fouling the membranes. When operated above 96% recovery, the principal foulant was found to be calcium fluoride. The ion exchange work showed that if all the hardness is removed from the concentrate, the silica concentration can exceed 1000 mg/L as long as the pH is high (at or near 11.0). Attempts to use the lime sludge solids for arsenic removal or in roadway base materials were largely unsuccessful. The most promising use of the solids was for pretreatment of silica-saturated RO concentrate to reduce the silica concentration, but additional work needs to be done to demonstrate its economic feasibility. Before injecting the concentrate into geo-thermally heated dolomite, the pH will have to be reduced to about 6.0 to avoid precipitation of calcium carbonate. / NOTE: Final rept. Oct 04-Aug 06. / Supplementary Notes: Sponsored by Bureau of Reclamation, Denver, CO. Technical Service Center. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 总页数： | u0819；64p |
| 报告类型： | 科技报告 |
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