Mixing Case Research on Water High quality in Storage Tanks | Kasco Weblog

Written by Lucy Allen (Kasco Municipal Enterprise Improvement Supervisor), Thom Tackman (Licensed Water Operator) & Scott Ham (Supervisor at Silver Creek Water Company),

This text is an in-depth examination at how Silver Creek Water Company carried out a case research to check, consider and enhance water high quality of their storage tanks. The purpose of the research was to make use of easy testing strategies to find out if tank mixing does enhance water high quality to the client faucet.


SCWC is in Sellersburg, Indiana, and lots of the residents’ work in close by Louisville, Kentucky.  SCWC purchases water from Indiana-American Water Firm and doesn’t deal with the water provided to them. The SCWC is ruled by a Board of Administrators who take nice pleasure of their services and their want to provide high-quality water to their clients.

The water distribution system consists of 5
water storage tanks and 4 water booster stations together with 155 miles of
distribution piping. The water storage tanks differ in dimension and quantity ranging
from 151,000 gallons in a standpipe tank to 2.2 million gallons in an in-ground
concrete tank. Water is provided by way of two-meter vaults.

Sustaining a chlorine residual to the client faucet has not been a significant subject however there have been instances when the chlorine residual would change, particularly in the summertime months. Disinfection by-products have by no means exceeded State and Federal requirements; nevertheless, they did appear to rise and fall for causes unknown on the authorized pattern factors.


Scott Ham is the Company Water Supervisor at
SCWC. After observing these modifications throughout the water tank, he desired to
perceive why water high quality was
altering within the distribution system and what he and his group may do to
decrease these

Throughout an annual water convention, a SCWC
board member got here throughout the Kasco sales space and requested Scott to have a look at the Kasco
CertiSafe Lively Mixer.

Scott had earlier expertise with energetic and passive mixers as each had been put in and working in two of the 5 water storage tanks. The Kasco group reviewed the appliance and beneficial to Scott’s group a ¾ hp, 120-volt Kasco CertiSafe ground mount mixer with a management panel. Temperature probes had been offered for free of charge by Kasco in order that temperature profile testing may very well be accomplished. The general straightforward set up of the mixer made the testing section manageable for Scott’s group.


SCWC Group put in a mixer within the new
Fairview Knob 2.2-million-gallon water tank. The mixer, energy cable, and
management panel arrived just a few days after the order was positioned, and with assist of a
native electrician, the mixer was put in by way of the middle vent of the
storage tank. Set up was straightforward and accomplished quickly after.

Just a few weeks after set up, a temperature string provided by Kasco arrived and was put in within the tank hatch away from the mixer. The take a look at ran for a number of weeks and the mixer was turned on and off through the take a look at interval to see the outcomes. Throughout the temperature testing, chlorine odors had been readily obvious when the mixer was off and weren’t detectable when the mixer was operating (determine 1 beneath).

Determine 1: Temperature readings taken within the water tank between July 1 and July 8, 2019.

In March 2020, Kasco group members Lucy Allen and Thom Tackman visited with Scott to debate further testing on the 2.2 MG Fairview Knob Tank throughout a second spherical of checks. The subsequent take a look at could be expanded and would come with each chemical and thermal stratification together with sampling and testing for disinfection by-product formation. 

The first step of the checks was to be sure that all of the company security requirements had been met, so that they first educated on climbing the elevated storage tanks to verify everybody had the right coaching and security gear. The second step was to find out what testing gear was required and find a lab to run TTHM and HAA5 samples (reference determine 3).  The samples had been pulled from the highest and backside of all 5 reservoirs. The third step was to coordinate the tank sampling with the temperature probe testing and doc the readings.

Testing started in June and was accomplished in August of 2020.  SCWC Group documented the outcomes of their chlorine residual and temperature testing and with assist from a neighboring laboratory the TTHM and HAA5 samples had been examined. The take a look at outcomes confirmed that the 2 tanks with energetic mixers had comparable free and complete chlorine residuals in each the highest and backside of the tanks no matter water age. The water temperatures had been almost the identical within the prime and backside of the tanks and disinfection by-product ranges had been very shut in each the highest and backside of the tanks (determine 2, Fairview Knob and Lakes Tank Knowledge). In brief, the energetic mixers had been assembly their meant function and likewise influenced decrease air temperatures within the headspace of the 2 tanks (determine 2).

Determine 2: TTHM and HAA5 knowledge.

The testing ends in the tanks with out the energetic mixers examined fairly completely different. The temperature distinction diversified by 10-degrees from the highest to the underside of the tanks and little or no measurable chlorine residual was examined on the prime of the tanks. SCWC operators had been fairly shocked by the chlorine outcomes measured on the prime of the tanks and accomplished a number of checks to confirm the residual outcomes.

TTHM and HAA5 outcomes had been much more revealing. Whereas the entire tanks had been totally cleaned and inspected throughout the previous 12 months, the disinfection by-product ranges had been 3 times larger within the prime of the tanks as in comparison with samples taken from the underside of the tanks. Take a look at outcomes concluded that TTHMs and HAA5 ranges had been a lot larger within the prime of the tanks when not actively combined (Determine 2, St. Joe, Deam Lake & Hwy 60 Knowledge).

Lively Mixing to the Rescue

Based mostly on testing performed by SCWC Group, the Board of Administrators authorized the acquisition of three further Kasco CertiSafe™ energetic mixers. When work is accomplished, all 5 of the water tanks could have energetic mixers with an gear price of lower than $10,000 per tank.

Scott Ham has a motto that he freely shares, “Don’t inform me what I can’t do, however slightly let me present you what we are going to do collectively!” The SCWC Group has efficiently demonstrated Scott’s “We Can Do It Collectively” perspective by finishing the gear set up and testing as a group.  The information they collected clearly reveals the advantages of energetic mixing. Their efforts have offered an economical water high quality enchancment answer on the buyer’s faucet, utilizing easy testing strategies.

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