Biochemical changes of some algae used in the remediation of some pollutant in municipal wastewater

Abstract

The current study aim to investigate the susceptibility of three types of algae, including
Oscillatoriasp, Westiellopsisprolifica, Stigonemasp, in reducing the values of some pollutants.
These algae were used as unialgal culture and the waste water was used from the final settling
ponds of central wastewater treatment plant (Almamierh) in Hilla city.as an growth culture for
the development of these algae by cultivating each algae alone in waste water under constant
laboratory conditions at 25 ± 20 ° C and in a light system 16: 8 hours Illumination: Darkness.
The results showed slightly increased in pH values, and low removal percent was recorded by
both Oscillatoriasp and Westiellopsisprolifica ,whileStigonemasp record a role by reducing the
values of total soluble solids , electrical conductivity and salinity .The results showed that the
studied Algae have the ability to reduce the biological oxygen demand , total Alkalinity , total
hardness , calcium and magnesium, chlorides , nitrite , nitrate and phosphates . As for the current
algae physiological status, the chlorophyll content did not change in Oscillatoria sp. after
treatment While chlorophyll content increased in W. prolifica, and decrease inStigonema sp. after
treatment. The effectiveness of the (SOD) enzyme did not change in all algae after treatment .
The effectiveness of the catalase enzyme elevated in Oscillatoria sp. and W. prolifica but decreased in StigonemaSp after municipal wastewater treatment. The study also showed that
Malondialdehyde (MDA) was increased in three studied species.