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Experimental Study on Modified Fly Ash as a Substrate of Constructed Wetland
Abstract:
In order to develop a new substrate filler for wetland, Fly ash and soil was mixed and modified in different mass ratio, then, static adsorption and seepage purification experiments were carried out to choose four appropriate modified fillers for wetland model experiment. Experimental results showed that when the mass proportion of fly ash and soil was 3:7, the best treatment effect was achieved. While using this modified wetland for wastewater treatment, the removal rate of total nitrogen (TN), total phosphorus (TP), ammonia nitrogen (NH4-N) and COD was 57.52%, 97.58%, 93.78% and 89.53% respectively. The effluent concentration of TN could meet the priority standard (level B) of Discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002), while the effluent concentration of TP, NH4-N and COD could meet the priority standard (level A).
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524-529
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October 2014
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