Presentation Title

Assessment of Microbial Growth in Reclaimed Water from Cal Poly Pomona’s Distribution System

Faculty Mentor

Monica Palomo

Start Date

23-11-2019 12:30 PM

End Date

23-11-2019 12:45 PM

Location

Markstein 102

Session

oral 3

Type of Presentation

Oral Talk

Subject Area

engineering_computer_science

Abstract

Given the situation of increasing freshwater scarcity, it is important to find an alternative source of water. This has provoked organizations to use reclaimed water as an alternative for urban, agricultural, and recreational uses, but more research should be done to study the biological and chemical conditions that could influence pathogenic behavior.

This research tested reclaimed water for 6 weeks in Cal Poly Pomona’s (CPP) reclaimed distribution network. Samples from five distribution sites were collected and tested at CPP. The pH and temperature were checked at the collection site, and the remaining physical, chemical, and biological tests were performed in the water analysis lab. Biological tests included an enterobacteria, coliform, and HPC count, and an ATP activity measurement. Non-biological tests included conductivity, alkalinity, total and free chlorine content, true and apparent color, and turbidity. The total organic carbon, total dissolved solids, and total solids were also measured.

On average, the temperature and pH have been found to be from 23-27 °C and 7.3-7.9 respectively. The TOC count has been seen as high as 8 mg/l, which is well above the EPA standard of 2 mg/l for acceptable drinking water (17). The CATP for each reclaimed water site has been significantly higher than that of the tap water. TS and TDS were generally higher for each location than that of the tap water. Turbidity was higher for each location than tap water in NTU. There have been heterotrophic bacteria found in the counts. Based upon the findings, the reclaimed water is not sanitary for direct human use. Future tests could show the impact of the water on the surrounding area over time.

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Nov 23rd, 12:30 PM Nov 23rd, 12:45 PM

Assessment of Microbial Growth in Reclaimed Water from Cal Poly Pomona’s Distribution System

Markstein 102

Given the situation of increasing freshwater scarcity, it is important to find an alternative source of water. This has provoked organizations to use reclaimed water as an alternative for urban, agricultural, and recreational uses, but more research should be done to study the biological and chemical conditions that could influence pathogenic behavior.

This research tested reclaimed water for 6 weeks in Cal Poly Pomona’s (CPP) reclaimed distribution network. Samples from five distribution sites were collected and tested at CPP. The pH and temperature were checked at the collection site, and the remaining physical, chemical, and biological tests were performed in the water analysis lab. Biological tests included an enterobacteria, coliform, and HPC count, and an ATP activity measurement. Non-biological tests included conductivity, alkalinity, total and free chlorine content, true and apparent color, and turbidity. The total organic carbon, total dissolved solids, and total solids were also measured.

On average, the temperature and pH have been found to be from 23-27 °C and 7.3-7.9 respectively. The TOC count has been seen as high as 8 mg/l, which is well above the EPA standard of 2 mg/l for acceptable drinking water (17). The CATP for each reclaimed water site has been significantly higher than that of the tap water. TS and TDS were generally higher for each location than that of the tap water. Turbidity was higher for each location than tap water in NTU. There have been heterotrophic bacteria found in the counts. Based upon the findings, the reclaimed water is not sanitary for direct human use. Future tests could show the impact of the water on the surrounding area over time.