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Landfill leachate treatment by the symbiotic system of bacteria and microalgae: high-efficiency and low-consumption green biological treatment system
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DOI：10.1039/D6RA02058E.png)
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Abstract
En 中文
This study uses domestic sewage to dilute landfill leachate; conserve freshwater resources; and supplement phosphorus. The proportion of landfill leachate is increased; and the microalgae photosynthesis is coupled with the SBR system to process the diluted leachate. A bacterial and algal symbiotic photobioreactor (PBR) was constructed to improve the efficiency of sewage treatment by optimizing parameters (aeration rate; light) for investigating the synergy of microalgae and bacteria; and the effect of treating Landfill leachate. The long-term operational impact of the reactor under two different inoculation conditions was investigated: one group was inoculated only with activated sludge and controlled light to promote the spontaneous growth of microalgae (Rc); and the other group was inoculated with activated sludge and Chlorella (Rs). The highest pollutant removal efficiencies were observed in 4 : 1 (microalgae/sludge) cultures; with COD at 96.5%; NH4+-N at 97.4%; and PO43−-P at 92.3%. Synergistic growth of bacteria and microalgae was observed; with a total biomass concentration of 2.32 g L−1. Pollutant removal effect was best at an aeration rate of 0.6 L min−1; with removal efficiencies of 72.7% for COD; 78.3% for NH4+-N; and 62.5% for PO43−-P. A low-aeration method; mechanical aeration and microalgae photosynthesis cooperated to reduce operating costs. When light intensity was 108 µmol m−2 s−1; pollutant removal efficiencies of COD 82.6%; NH4+-N 84.9% and PO43−-P 75.9% were achieved. Treatment effect of the Rs system: average volume load of 36.22 mg per L per h COD; 8.53 mg per L per h NH4+-N; 0.44 mg per L per h PO43−-P. This provides new ideas for achieving high-efficiency; low-consumption green biological treatment of landfill leachate.
Keywords:
Landfill leachate treatment
Microalgae-bacteria symbiosis
Photobioreactor
Pollutant removal efficiency
Low-energy consumption
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