Improvement on filterability in the aerobic treatment of carboxymethyl cellulose (CMC) wastewater
CMC is chemically modified from natural cellulose and widely applied in various industries. CMC wastewater consists mainly of sodium glycolate, sodium chloride and water. With extremely high COD and salinity, high concentration CMC wastewater can’t be biologically treated, but with COD and...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Association of the Chemical Engineers of Serbia
2014-01-01
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| Series: | Chemical Industry and Chemical Engineering Quarterly |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1451-9372/2014/1451-93721300031Q.pdf |
| Summary: | CMC is chemically modified from natural cellulose and widely applied in
various industries. CMC wastewater consists mainly of sodium glycolate,
sodium chloride and water. With extremely high COD and salinity, high
concentration CMC wastewater can’t be biologically treated, but with COD and
salinity around 15000 mg/L and 30000 mg/L respectively, low concentration
CMC wastewater can be aerobically treated. In a CMC factory, the treatment
of low concentration wastewater with aerobic MBR was successful except for
one serious problem: poor filterability. Two trial solutions: adding
micronutrients and applying MBBR were expected to improve the filterability.
In the experiment, adding micronutrients was achieved by mixing filtered
natural water into the wastewater, rather than dosing chemicals into it. The
treatment efficiency of both solutions was close, but adding micronutrients
showed distinguished performance in improving filterability, which includes
higher filtration flux and slighter membrane fouling. Adding micronutrients
also effectively improved the filterability under severe salinity shock. |
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| ISSN: | 1451-9372 2217-7434 |