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| A study on municipal waste leachate treatment with ozonation-biological aerated filter |
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Abstract This study attempted to substitute the nanofiltration (NF)- reverse osmosis (RO) process with ozonation-biological aerated filter (BAF) in the advanced treatment of leachate from municipal solid wastes incineration plant. Semi-batch ozonation test in a 10 L column reactor demonstrated that the biodegradability of test leachate improved as ozonation time increased, 91% of color and 64% of UV254 could be removed within 15 min, the COD removal rate was 59% within the first 45 min, but thereafter slowed down with a removal rate of 77% at 120 min. Continuous flow test revealed that 1 h of ozonation (78.8 mg/L, 3.7 mL/min) followed with BAF (HRT=4.3h) could remove 75% of COD, 95% of color and 89% of UV254 from the leachate. The effluent COD remained below the discharge standard during 2/3 of the operational time and the effluent color was able to meet the discharge standard. The above results suggested the possibilities of substituting NF-RO with ozonation-BAF to treat waste leachate. The results of GC-MS indicated that the dominant pollutants in the test water were alkanes, aromatic compounds and heterocyclic compounds containing nitrogen, and ozonation-BAF was effective in removing the later two kinds of pollutants, but difficult in removing alkanes.
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Received: 15 December 2013
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