High Organic Loading Rate And Waste
Stabilization Pond’s Operation Efficiency:
A Case Study
Author(s)
Sh. Jamshidi, G. B Gholikadi & H. R. Orumieh
Abstract
Liquid waste management is an important component of sanitation activities.
Waste stabilization pond system is very low cost, easy for maintenance and the
stabilized water outflowing from the system can be used for irrigation purposes
in agriculture, horticulture, etc. The affect of high organic loading rate and
occurrence reasons of purple sulfur bacteria (PSB) in waste stabilization ponds
were investigated. Chemical parameters which affect on PSB growth like COD,
and hydrogen sulfide (H2S) were observed monthly. The mixed culture
populations of PSB were considered and determined by spectro-photometric
method. The cell suspension was whitish pink when elemental sulfur globules
occurred inside the cells, and turned purplish red once the globules were
consumed. The measurement of flow was carried out by means of a Partial flume
in which located at the inlet channel. Measurement of flow was done
simultaneously with wastewater sampling. The measured average of COD
concentration of raw wastewater with around 1520.33 mg/l was much higher
than the expected design concentration of 550 mg/l, respectively, for COD. Thus,
the raw wastewater in Hoveizeh can be classified as a high strength in terms of
COD. Results showed that the PSB dominated in two periods, which the first
was in midsummer (in primary facultative pond) and the second was in
midwinter (in tertiary facultative pond). This condition was occurred by high
organic loading rate (OLR) and high concentration of H2S which were caused
overcoming of the PSB over algae. Results showed that the OLR was the main
affecting parameters in the overcoming of PSB.
Keywords
waste stabilization pond, operation, OLR, COD, H2S, purple sulfur bacteria
Related Book
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