MORRIS FORMAN WASTEWATER TREATMENT PLANT

COMMUNITY ODOR SURVEY PROJECT

VERBAL DESCRIPTION

Week #49

The community odor survey was conducted on the morning of Wednesday, March 1, 2000. It was a mostly sunny day with steady winds, generally out of the south southwest at 1-6 miles per hour. The temperature was about 56°F.

For the five (5) ambient sampling locations (#1-#5) in the neighborhoods north and northeast of the treatment plant, along the Dumesnil St. corridor, the odor intensity ranged from no odor to noticeable and the hydrogen sulfide (H₂S) concentrations ranged from 0-7 parts per billion (ppb). Zimpro odors from the MFWTP were detected at stations #2 and #3 and industrial chemical odors were detected at stations #4 and #5.

No odors were detected at two of the three (3) sampling stations (#6-#8) in the neighborhoods east and southeast of the plant and the H₂S levels ranged from 3-7 ppb. No odors were detected from the MFWTP but an industrial chemical odor was detected at station #6.

For the three (3) sampling stations (#9-#11) located south and southwest of the treatment plant in the more industrial areas of the City, the odor levels ranged from very faint to noticeable. The H₂S concentration was from 3-6- ppb. A noticeable industrial chemical odor was detected at station #10 in front of Zeon Chemical.

At the MFWTP the wind was generally out of the south southwest at 0-10 mph. The odor intensity at the seven (7) sampling stations around the plant ranged from no odor to strong. H₂S concentrations at these stations were in the range of 3-8 ppb with the highest readings measured near the sludge storage tanks at stations #14 and #15. Strong sludge odors were detected at stations #14 and #15. Industrial chemical odors were detected at station #17. The biotowers were feeding primary effluent (without Zimpro recycle) 24 hours per day with flow from #2 pump (48,611 gpm) split to each tower. The new biotower scrubbers were running. They were started on 2/29/00. Station #17 is located near the exhaust of these scrubbers and no unusual or increased odor was observed at this station. An industrial chemical odor was detected at this location but it was not coming from the scrubbers. The H₂S removal efficiency of Biofilter #1 has improved but it is still not operating as well as it should. Testing is on-going.