کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5746958 | 1618789 | 2017 | 7 صفحه PDF | دانلود رایگان |
- A novel Hanbon was established for simultaneously treating NH4+-N and NO3â-N.
- High nitrogen removal rate of 9.0 ± 0.1 kgN·mâ3·dâ1 was achieved in Hanbon.
- Potential capacity of Hanbon process to treat municipal wastewaters was achieved.
- Microflora in Hanbon were revealed at both high and low nitrogen loading rate.
A novel Heterotrophic Ammonia and Nitrate Bio-removal Over Nitrite (Hanbon) process, combining Short Nitrate Reduction (SNR) with Anaerobic Ammonia Oxidation (Anammox), was developed in a lab-scale continuous up-flow reactor. The substrate effects were investigated to characterize the performance of Hanbon process, and the corresponding microflora information was also revealed. Our results showed that the optimal substrate ratio of NH4+-N:NO3â-N:COD for the Hanbon process was 0.65:1:2.2. The volumetric nitrogen removal rate was up to 9.0 ± 0.1 kgN·mâ3·dâ1 at high influent substrate concentrations of NH4+-N 375 mg Lâ1, NO3â-N 750 mg Lâ1 and COD 1875 mg Lâ1, which was superior to the reported values of analogous processes. Moreover, the effluent total nitrogen concentration was able to meet the strict discharge standard (less than 10 mg Lâ1) at low influent substrate concentration of NH4+-N 26 mg Lâ1, NO3â-N 40 mg·Lâ1and COD 88 mg Lâ1. Illumina-based 16S rRNA gene sequencing results showed that Halomonas campisalis and Candidatus Kuenenia stuttgartiensis were the dominant bacteria in the SNR section and Anammox section at high substrate concentration condition. However, Halomonas campaniensis and Candidatus Brocadia brasiliensis were raised significantly at low substrate concentration condition. Hanbon process provided in the present work was flexible of treating wastewater with various nitrogen concentrations, deserving further development.
Journal: Chemosphere - Volume 182, September 2017, Pages 532-538