Backwash percentage, which is often called "percent backwash", is the ratio of backwash water used by a plant versus the total water produced by the plant, as expressed in a percentage form. All backwash percentage problems will provide both the backwash water used and the total plant production. Generally speaking, backwash percentage math problems are easily calculable from the basic information provided within the problem. The answers to most backwash percentage problems will fall somewhere into the .5 percent to 8 percent range.
To calculate backwash percentage, divide the numbers of backwash gallons used by the total finished production of the plant. (A ten-digit calculator should be used.) Then, multiply this tiny number, which usually ranges from .005 to .080, by 100
1. A water treatment plant used 28,923 gallons of backwash water while producing 3,175,000 gallons of finished water. What was the plant's backwash percentage?
Answer: Divide 28,923 by 3,175,000 to obtain a number that is approximately .0091. Then, multiply .0091 by 100 to obtain a backwash percentage of .9%. This plant used slighly under 1% of its water to backwash filters.
2. In the wintertime, a water treatment plant experienced shorter filter runs because of increased turbidity break-through on its filters. This plant used 86,755 gallons of backwash water, while producing 1,650,000 gallons of finished water. What is this plant's backwash percentage?
Answer: Divide 86,755 by 1,650,000 to obtain a number that is approximately .0526. Then, multiply .0526 by 100 to obtain a backwash percentage of 5.26% (rounded to 5.3% or just 5%).
Sunday, June 7, 2009
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