Pre-oxidation of ammonium using nanofiltration membranes for partial nitrification preceding Anammox
This study examined the pre-oxidation of ammonium using a nanofiltration (NF) hollow fiber membrane module to provide an alternative to conventional partial nitrification preceding Anammox. A permeability study showed that NF membranes were suitable for use in the pre-oxidation of ammonium due to h...
| Main Authors: | , |
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| Format: | Article |
| Language: | English English English |
| Published: |
Elsevier B.V.
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/65159/ http://irep.iium.edu.my/65159/ http://irep.iium.edu.my/65159/ http://irep.iium.edu.my/65159/1/65159_Pre-oxidation%20of%20ammonium%20using%20nanofiltration.pdf http://irep.iium.edu.my/65159/2/65159_Pre-oxidation%20of%20ammonium%20using%20nanofiltration_SCOPUS.pdf http://irep.iium.edu.my/65159/13/65159%20Pre-oxidation%20of%20ammonium%20using%20nanofiltration%20membranes%20for%20partial%20WOS.pdf |
| Summary: | This study examined the pre-oxidation of ammonium using a nanofiltration (NF) hollow fiber membrane module
to provide an alternative to conventional partial nitrification preceding Anammox. A permeability study showed that NF membranes were suitable for use in the pre-oxidation of ammonium due to high ammonium fluxes across the membrane (low rejection of ammonium), while most COD (in the form of glucose) was retained inside the
bulk phase (high rejection of glucose-COD). In pre-oxidation, ammonium oxidizing bacteria (AOB) grown in the
shell-side of the membrane module could oxidize the ammonium diffusing from the tube side mainly to nitrite,
which then diffused back into the tube side, resulting in a mixture of ammonium and nitrite in the exit stream in
an approximately equimolar ratio. This would meet the requirement for the Anammox process as suggested by
previous reports. The application of a membrane process for the pre-oxidation of ammonium was found to be
promising at a laboratory-scale, and practically viable at a scale similar to a full-scale reactor (Whitlingham STC, Norwich, UK) based on an estimate of the number of HF modules needed. However, a proper optimization study
of the process is strongly recommended so that its feasibility could be further examined at a larger scale linking both nitritification and Anammox together. |
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