Coupling UV-H2O2 to accelerate dimethyl phthalate (DMP) biodegradation and oxidation
Bin Chen1, Jiaxiu Song1, Lihui Yang1
1Department of Environmental Science and Engineering, College of Life and Environmental Science, Shanghai Normal University, Shanghai, 200234, People's Republic of China.
Biodegradation
|September 7, 2015
Summary
Intimate coupling of UV-H2O2 advanced oxidation with biodegradation significantly enhances dimethyl phthalate (DMP) removal. This method overcomes inhibition issues seen in sequential treatments, improving efficiency for environmental health.
Area of Science:
- Environmental Science
- Chemical Engineering
- Biotechnology
Background:
- Dimethyl phthalate (DMP) is an industrial chemical and endocrine disruptor with slow biodegradation.
- Advanced oxidation processes (AOPs) coupled with biodegradation can improve DMP removal.
- Internal circulation baffled biofilm reactors (ICBBRs) offer a platform for coupled treatments.
Purpose of the Study:
- To evaluate two methods of coupling UV-H2O2 AOPs with biodegradation for DMP treatment.
- To compare sequential and intimate coupling strategies in an ICBBR.
- To elucidate the mechanisms behind enhanced DMP biodegradation.
Main Methods:
- Utilized an internal circulation baffled biofilm reactor (ICBBR).
- Implemented sequential coupling: UV-H2O2 pretreatment followed by biodegradation.
- Implemented intimate coupling: simultaneous UV-H2O2 and biodegradation within the ICBBR.
- Monitored DMP, carboxylic acids, and phthalic acid (PA) concentrations and biodegradation rates.
Main Results:
- Sequential coupling led to pH depression and phthalic acid accumulation, inhibiting DMP biodegradation.
- Intimate coupling prevented accumulation of inhibitory intermediates (carboxylic acids, PA).
- Intimate coupling achieved a 13% faster biodegradation rate than biodegradation alone and 78% faster than sequential coupling.
- DMP oxidation increased by 5% (biodegradation alone) and 39% (sequential coupling) with intimate coupling.
Conclusions:
- Intimate coupling of UV-H2O2 with biodegradation in an ICBBR is superior to sequential coupling for DMP removal.
- Rapid catabolism of intermediates during intimate coupling generates electron carriers, accelerating PA di-oxygenation and relieving inhibition.
- This optimized approach enhances energy input efficiency for DMP treatment, benefiting environmental remediation.
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