Chlorination is a standard for municipal water treatment. UV has been added to the required minimum treatment for some localities due to te rise of chlorination resistant bacteria.
American Water College
Published on Mar 26, 2012
americanwatercollege.org
This question comes from the California Wastewater grade 3 certification exam sample questions that can be found here: www.swrcb.ca.gov/water_issues/…
The problem reads:
In an attempt to correct a filamentous growth in an activated sludge process, you want to inject chlorine into the RAS flow stream at the dosage of 2.5 pounds of chlorine per 1000 pounds of return activated sludge suspended solids. Show the calculations to find the proper chlorinator feed setting (in pounds of chlorine per day), given the following
information:
Average Plant Flow Rate 9.0 MGD - MLSS Conc. 2850 mg/L
RAS Flow Rate 3.3 MGD - MLVSS Conc. 2600 mg/L
WAS Flow Rate to DAF 1.2 MGD - RAS Conc. 8500 mg
City of Richardson
Published on Feb 8, 2016
SUBSCRIBE 331
The free chlorine maintenance does not affect water quality, and the water remains safe for use. Consumers who are sensitive to taste and odor changes in drinking water might notice a slight change during this period, however this palatability change does not alter the quality of the drinking water. For more information, visit www.ntmwd.com
The North Texas Municipal Water District (NTMWD) has scheduled a free chlorine maintenance that will be conducted on its water transmission system and customer cities’ distribution systems for a 28-day period from March 7-April 4. The free chlorine maintenance is a water system maintenance function as well as a water conservation measure. As a member city, Richardson receives its water from NTMWD.
The Texas Commission on Environmental Quality (TCEQ) allows water suppliers to perform a free chlorine maintenance in order to maintain proper chloramine levels (required by TCEQ) during the warm weather periods, thus conserving water.
The chloramines, a combination of chlorine and ammonia, are used to provide the disinfectant residual in the transmission and distribution systems as required by the TCEQ. Chloramines provide a longer lasting residual disinfection in the water pipelines and water storage facilities.
The free chlorine maintenance does not affect water quality, and the water remains safe for use. Consumers who are sensitive to taste and odor changes in drinking water might notice a slight change during this period, however this palatability change does not alter the quality of the drinking water. For more information, visit www.ntmwd.com.
myVIQUA
Published on Jan 15, 2016
Meet Captain UV as he takes on Chlorine and the gang of pesky bacteria that can sneak into your drinking water.
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