Abstract

Instruction and implementation of a new laboratory biological treatment
system -unit . The complete removing was achieved after 7 days . The hydraulic
were achieved to reduce the pollution of industrial wastewater of artificial
fertilizers company with some inorganic pollutants ( NH4
+
, NO2
-
, NO3
-
AND
SO4
2- ) and organic ( Biological Oxygen Demand , BOD5 ; urea and Total
Suspended Solids ,TSS ). The modified culture media ,by me , were used to
optimize the specific variables related to this study . Immobilized technique was
used in all units of biological system that consists of Mixo- unit with non discrete
spaces, Denitrifying and Sulfate reducing units .
The mixo-unit was operated by Fed- batch technique of the whole volume
meanwhile the other units by batch technique . In laboratory artificial medium
(ND- A ) the primary concentration of ammonium and sulfate were 1300 mg / l
and 3800 mg / l and reduced to 50% and 45% respectively in Mixoretention time
required to reduce 500 and 1300 mg / l of ammonium and sulfate respectively in
fed- batch culture was 40 hr . The retention time of fed- batch became stable at a
range of 25 -26 hr in removing the same concentrations and not across the
environmental limitations of NO2
-
, NO3
- , in addition to reduce the BOD to the
allowable concentration . The ammonium , nitrite and nitrate were reduced after 4
and 3 days for pretreated and disposed treated wastewater respectively using
Mixo- unit and batch technique . Nitrate was removed by concentration of 500 mg /
l in denitrifying unit using the modified medium ( O3a – A) . The sulfate was
removed in modified medium ( C- medium) by concentration of 2129 mg / l
during 3 days using batch technique and anaerobic conditions.