Abstract
Trickling biofilters (TFs) allow for a simultaneous nitrification and denitrification (SND) process, and offer a favorable solution for the treatment of swine-wastewater digested liquid due to their simple operation and low cost. In this study, a soil trickling biofilter (STF) was developed to enhance nitrogen removal. A gravel trickling filter (GTF) and a woodchip trickling filter (WTF) were also constructed and operated synchronously to demonstrate the advantage of micron-sized media. The results showed that the STF had a higher ammonium nitrogen (NH4+-N) removal capacity of 21.4%, 24.9%, and 18.3% in comparison to the GTF when the influent NH4+-N was 192.9 mg L−1, 500.2 mg L−1 and 802.1 mg L−1, respectively. The total nitrogen (TN) removal capacity of the STF was 104.6%, 89.4%, and 37.5% higher than that of the WTF. Thus, the addition of micron-sized soil to TF could increase the systemic nitrogen removal capacity.
Highlights
Swine wastewater from large-scale farms can have a high chemical oxygen demand (COD) and high ammonium nitrogen (NH4+-N) concentration, making it a major pollutant in vast rural areas.[1]
The soil trickling biofilter (STF) had a similar NH4+-N removal rate to that in woodchip trickling filter (WTF) during periods I and II, but an obviously higher NH4+-N removal rate in comparison to the WTF during period III. This indicates that the STF had a better ammonia oxidizing capacity and resistance in comparison to the WTF, especially under a high NH4+-N loading
The abundance of the ammonia oxidizing bacteria (AOB) was indicated by the brightness of bands A1, A2, and A4 in the lanes of the three Trickling biofilters (TFs), which showed that the abundance of Nitrosomonas was similar in the three reactors
Summary
Swine wastewater from large-scale farms can have a high chemical oxygen demand (COD) and high ammonium nitrogen (NH4+-N) concentration, making it a major pollutant in vast rural areas.[1]. The key point of swine wastewater treatment is the removal of nitrogen from the digested liquid with a low carbon/nitrogen ratio (C/N).[7] Most technologies for nitrogen removal are based on the conventional nitri cation and denitri cation processes. The traditional biological nitrogen removal process includes plug ow reactors [e.g., anoxic oxic (A/O)]8 and continuous stirred tank reactors [e.g., sequencing batch reactor (SBR)].9,10. These techniques have a favorable effect on nitrogen removal during swine-wastewater digested liquid treatment, they are disadvantageous in terms of their running costs The traditional biological nitrogen removal process includes plug ow reactors [e.g., anoxic oxic (A/O)]8 and continuous stirred tank reactors [e.g., sequencing batch reactor (SBR)].9,10 these techniques have a favorable effect on nitrogen removal during swine-wastewater digested liquid treatment, they are disadvantageous in terms of their running costs
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