کاهش BOD و COD پساب توسط باکتری های بومی جدا شده از پساب صنایع عرق گیری گیاهی

Abstract

The waste produced by households, industry, and factories to use as wash water
and cooling systems and equipment, is caused environmental complications.
Waste created a suitable environment for the growth of odor and pathogenic
bacteria. The present study aimed to isolate microorganisms in the wastewater
and use them for the reduction of BOD (biochemical oxygen demand) and COD
(chemical oxygen demand). The samples were collected aseptically from
different parts of wastewater of herbal distillation industry. The bacterial strains
were isolated from the samples in LB media. The isolates were distinguished
based on the morphology and biochemical characteristics. Among the total 69
isolates, four isolates were selected to measure the ability to reduce BOD and
COD and added to the wastewater. Reduction of BOD was measured using BOD
meter. Also, COD was determined by the titration method. The isolates were
identified by biochemical tests. The amount of BOD and COD reduction after
adding selected strains to wastewater was 47.43‐71.82% and 44.79‐56.50%,
respectively. Also, the consortium of bacterial strains showed better ability to
reduce BOD and COD (38.32‐57.29% and 76.6‐83.21%, respectively). The results
determined that wastewater contains bacterial strains that have shown a
significant reduction in BOD and COD and organic matter decomposition in
wastewater and reuse it in agricultural and industrial sectors. Therefore, these
strains can