Southern Water Pollution Control Facility
The following are results of two tests performed on sewage flow and overflow problems in the state of Georgia.
~PROJECT #1 - SEWAGE FLOW TREA TMENrt
PROBLEM: Grease was forming on the pump station wet well, sidewalls and floating in the wet well. The grease was in danger of blocking the level control bubbler line and was contributing to odors and deterioration of the concrete structure.
TEST OBJECTIVES: To test the efficacy and use of the Enzyme product in the removal and reduction of grease from the sewage pumping stations.
EXISTING CONDITIONS: Three locations in a sewer line approximately 1 mile in length. Point#1, a manhole location, which provides access 100 feet from Point #2, a pump station, which is in line with Point #3, a second pumping station, located near the [name] River. Point #1 had a virulent growth of algae, the pump station #2 had blocks of grease on the sidewalls and bottom of the enclosure. Pump station #3 had a strong sewage odor as well as more fats and grease.
Flow rate at station #2, a sewage lift station, is 10,000 gallons per day. The sewage line then travels to the next pump station #3, which has a total combined flow of 500,000 gallons per day.
APPLICATION:
DAY ONE:
9:30 AM: pump station #2, 320z. of concentrate diluted 2:1 with water was used to purge the system.
10:30 AM: manhole point #1, 115ft. of 1// plastic tubing was installed to a Viking metering pump and
inserted into the manhole. Enzyme product was metered into the manhole at 20z. per minute, cycled for 2 minute flows four times per day (5:00 AM, 10:00 AM, 5:00 PM, 10:00 PM). A total of 480z. of Enzyme product was used to purge the pump station #2 and fill the 115ft~ of tubing. Total Enzyme product used on a daily basis was 160z. (4 cycles with 40z. per cycle).
11 :00 AM: all pump stations and the manholes were checked - a strong odor was found at all locations.
DAY TWO:
Manhole #1 was inspected and found that the alga was eliminated from that location. Pump station #2 showed grease blocks had broken down, odor was gone and loose trash could be removed with a rake. Pump station #3 odor of sewage was still present.
DAY THREE:
Pump station #2 - no re-congealing of grease and no sewage odor. Pump station #3 - odor lessened by approximately 50%.
DA YS FOUR• SIX:
No inspection performed.
DAY SEVEN:
Application of Enzyme product (estimated application time was 1 :00 PM): All three locations were inspected. Manhole #1 was still free of algae. Pump station #2 was operating with no clogging by grease blocks and odor was reduced. Pump station #3 sewage odor still present, no blockage due to grease or fats.
CONCLUSION:
During the seven day application, the grease blocks had disappeared or been reduced, making it possible for the pumps to move smaller grease bits through the system. Odor reduction at points #1 and #2 was significant. At point #3, with the increased volume from other lines flowing to that point, the application rate of 1 part Enzyme product to 12 million sewage flow was insufficient to promote significant odor reduction.
The disappearance of the algae and grease blocks on the walls below the "tilled capacity line" in pump station #2 occurred as expected.
Total Enzyme product used = 1776 oz. 80 oz. purge &
96 oz. flow treatment (16 oz.lday x 6 days)
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