Organics and nitrogen removal from wastewater across a plate of entrapped mixed microbial cells

Issue Date

6-2013

Abstract

This work investigated the concurrent removal of organics and nitrogen from wastewater as it passed through a slab of immobilized activated sludge of different thickness. Removals of chemical oxygen demand (COD) by 90% from feed of 300 mg L and of ammonia nitrogen (NHˉN) by 30 to 50 % from feed of 27 mg L in the synthetic wastewater were achieved. Wastewater exited the entrapped mixed microbial cells (EMMC) bed of 0.01 m in depth after a hydraulic retention time of 8 h through the bed, Increasing the bed thickness by up to 5 folds resulted in no enhancement and the removal of nitrogen by oxidation via nitrification, both occurring in the aerobic zone of the EMMC bed near the entrance surface. Denitrification occurred deeper into the anaerobic zone of the bed removed nitrate, leaving behind <0.75 mg L ˉ¹ of nitrate in the emerging effluent. Apparent first-order rate constant were >0.29/h and >0.045/h for COD and NHˉN removal, respectively.

ISSN

0119-1144

Volume

16

Issue

1

Page

29-35

Document Type

Article

College

School of Environmental Science and Management (SESAM)

Physical Description

graphs

Language

English

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