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configuration. When the same pumps were used in an even larger unit, a slightly lower total power figure was obtained. The data recorded for the 30,000 GPD unit are representative of conditions at the end of over 2000 operating hours. The data fairly represent the running record with two exceptions. First, during 90% of the operating time the apparent stack resistance was 15% lower than at the end and, second, the current efficiency average over 2000 hr was 85.6 __+ 2%. Allowing for these two factors brings the estimated minimum power to 1.00 kwhr/1000 gal in good agreement with the figure found in operations with the 6000 GPD unit. Conclusions and RecommendationsA self-contained device for the acidification of desalination plant feed streams has been developed. The acid generator requires as inputs electricity and the desalination plant feed stream. Substantial units of 6000 and 30,000 GPD have operated at a total power level of 2.5 kwhr/I000 gal. There are indications that this could be cut in half. The large systems tested suffer from two correctable defects. First, the cells in future units should be long thin rectangles or lozenges to get better flow distribution and to avoid problems associated with buffer precipitate settling in the quiescent portions of the round cell sections used here. And, second, further work on the catholyte/buffer system is required. Flow rates, stream ratios, and the like must be readjusted to produce a high salinity buffer stream before any significant cell power reduction is possible. Further, if the pH of the buffer can be lowered by only 1 unit, additional improvements in power requirements can be realized.

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