| 摘要 |
<p>A pump system for tangential flow and cross-flow filtration systems, such as reverse osmosis, nano, and micro filtration systems, that independently fixes the percent of recovery of product water for each stage and recovers the energy normally lost in rejected waste streams. The pump (10) is positive displacement and fixes the recovery by establishing set ratios between the feed water inlet and reject stream volume of each stage of the filtration system while using the same ratio setting components to recover the energy normally expelled in reject, or concentrate, waste streams. The ratios are set by having cylinder bores (13(A-F)) of decreasing volume with associated pistons (14(A-F)) that reciprocate therein to move the fluid. The pump (10) aids in conservation of water by allowing efficient multi-stage reprocessing of the concentrate streams from all but the final stage of processing.</p> |
