YANG Aiai, CHEN Jianguo, WANG Xiaoli, et al. Removal of Organic Matter from Biogas Slurry by Binary Co-precipitation System and Mechanism Analysis[J]. 2020, 34(1): 380-384.
YANG Aiai, CHEN Jianguo, WANG Xiaoli, et al. Removal of Organic Matter from Biogas Slurry by Binary Co-precipitation System and Mechanism Analysis[J]. 2020, 34(1): 380-384. DOI: 10.13870/j.cnki.stbcxb.2020.01.054.
In consideration of high organic matter content in biogas slurry of pig farm
and long cycle
high cost
and difficult to remove of other treatment processing
a binary co-precipitation system comprising an aqueous calcium oxide solution and AlCl3 was applied to remove organic pollutants of biogas slurry. The effects of precipitant ratio
dosage
reaction time
and initial pH of biogas slurry on the removal of organic matter were investigated. The results showed that the maximum removal rate of organic matter reached 93% when the co-precipitant volume ratio was 1:2.5
the dosage was 1:1 (volume ratio)
and the reaction time was 60 min at pH 9. The XRD
FITR
and SEM analysis of the precipitates before and after the reaction demonstrated that the co-precipitant could flocculate and precipitate organic matter by charge attraction with negatively charged organic matter
and complexation with normal valence metal ions in the biogas slurry. The precipitation reaction was rapid and could completely remove organic matter
and had good industrial application prospects in farm wastewater treatment.