Nitrate removal using a mixed-culture entrapped microbial cell immobilization process under high salt conditions

doi:10.1016/0043-1354(94)00296-J

Water Research

Volume 29, Issue 6, June 1995, Pages 1525-1532

https://doi.org/10.1016/0043-1354(94)00296-J Get rights and content

Abstract

Brine wastes resulting from the regeneration of exhausted ion exchange resins require further treatment for final disposal. In this study, a mixed-culture entrapped microbial cell immobilization (EMCI) process for nitrate removal from brine wastes was examined. Because of the presence of elevated concentrations of sodium chloride or sodium bicarbonate in the brine waste, the effects of high salt concentrations on the mixed-culture EMCI process and sludge production were investigated. Denitrification capacity of the mixed-culture EMCI process was found to be slightly affected at sodium chloride or sodium bicarbonate concentrations up to 20 g/l. The process generally performs better than other biodenitrification processes in the presence of salt concentration typically required for the regeneration of ion exchange resins. The cell yields were estimated to be 0.11 gSS produced/g COD removal or 0.36 g SS produced/g nitrate-N removed. The mixed-culture EMCI process was found to be an economical alternative for treatment of brine wastes and exhibits a great potential to be coupled with an ion exchange process for complete nitrate removal. The proposed coupling represents a closed-loop treatment in which the brine waste from ion exchange processing is denitrified by the mixed-culture EMCI process and the denitrified effluent is recycled to regenerate exhausted resins, resulting in the reduction of salt requirements for regeneration.

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Nitrate removal using a mixed-culture entrapped microbial cell immobilization process under high salt conditions

Abstract

Wat. Res.

Wat. Res.

Wat. Res.

Wat. Res.

Standard Methods for the Examination of Water and Wastewater

Denitrification of high nitrate wastes using an anaerobic filter

High denitrification of concentrated nitrate wastewater

Wat. Sci. Technol.

Denitrification in natural waters

Prog. Wat. Technol.

Biological denitrification in rotating disc system

Biological denitrification of sewage: literature review

Prog. Wat. Technol.

Microbiology for Environmental Scientists and Engineers

Removal of ammonia and nitrate in the treatment of potable water

Small Water System Treatment Costs