ZHAO Bowei, LI Jianzheng, DENG Kaiwen, et al. Efficiency of wood-chip-framework soil infiltration system in treating anaerobically digested swine wastewater[J]. CIESC Journal, 2015, (6): 2248-2255.
ZHAO Bowei, LI Jianzheng, DENG Kaiwen, et al. Efficiency of wood-chip-framework soil infiltration system in treating anaerobically digested swine wastewater[J]. CIESC Journal, 2015, (6): 2248-2255.DOI: 10.11949/j.issn.0438-1157.20150111.
A wood-chip-framework soil infiltrator (WFSI) with slow-release of carbon source was constructed and used to treat an anaerobically digested swine wastewater characterized with high NH4+-N and low C/N ratio. Pollutant removal efficiency of the WFSI was investigated under various influent concentration and varying surface hydraulic load (SHL). Under SHL of 0.2 m3·m-2·d-1
influent averaged COD and NH4+-N increased from 152 and 175.5 mg·L-1 to 421 and 788.7 mg·L-1
respectively. The resultant COD
NH4+-N and TN removal by the system was 52.3% to 61.2%
84.2% to 61.5% and 28.6% to 33.5%
respectively. Meanwhile
NH4+-N and TN removal loading reached 75.5 and 41.7 g·m-3·d-1
respectively. Though SHL was as high as 0.32 m3·m-2·d-1
the system still performed but its efficiency was remarkably influenced. When influent COD and NH4+-N was around 265 and 465 mg·L-1
COD
NH4+-N and TN removal was about 56.5%
53.3% and 20.9%
respectively. The wood carrier observably worked as a slow-release carbon source
and protected the ammonia oxidizing bacteria from free ammonia toxicity due to the concentration gradient of NH4+-N in the adhesive layers.