Abstract
High organic matter load and nutrient concentration in swine wastewater could lead to soil and water pollution by inappropriate land irrigation. To solve the above problem, this study developed an eco-friendly bio-flocculation combined with electrodialysis (BF-ED) process, in which BF could effectively reduce the probability of ED membrane fouling and replaced subsequent biochemical treatment by ED process. High removal of TS (100 %), TP (100 %), and COD (95.68 %) from raw swine wastewater could be obtained via BF pretreatment, while high recovery efficiency of nutrient ions (98.8 % K+ and 84.3 % NH3-N) was achieved after ED process. Besides, dissolved organic matter was effectively removed after BF treatment, which was beneficial to reduce membrane fouling of ED reactor. Nutrient ions recovery from swine wastewater could be used as agricultural fertilizers. The proposed approach not only solve the problem of swine wastewater purification, but also realize the environmentally sustainable swine wastewater.
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