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1 Zeszyty Naukowe. Inżynieria Środowiska / Politechnika Opolska

1 2003

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Effects of pretreatment of dye wastewater using iron filings filtration and H2O2

Ruixia H., Peng L., Yuwen Z., Shuiyuan C.

Zeszyty Naukowe. Inżynieria Środowiska / Politechnika Opolska

2003

Vol. 291, z. 4

277-282

China is the largest country in the world in production and exportation of dye. The wastewater from dye producing process is a serious source of pollution in natural water resources. Its ingredients are very complex and harmful to the environment. Most of the ingredients are man-made synthetic chemical materials that are very difficult to biodegrade, which makes bio-treatment methods inefficient. At present, there are no satisfactory methods for the treatment of the wastewater. This paper reports the result of pre-treating the dye wastewater by an Iron Filings Filter (IFF) + H2O2. Micro electrolysis action takes place with the IFF and produces Fe2+ ions, which form the Fenton oxidation reagent with added H2O2 in the influent. This can break and change the long-chains and link structures of the dye molecules or pollutants into biodegradable materials so that this wastewater may be further treated easily by biological methods. When only using the Iron Filings Filter (IFF), the BODs/COD value of the effluent increased by 0.2-0.3 more than that of the original wastewater at pH4 and hydro-remain time (HRT) 8 min. When 30%H2O2 was added to the influent at a rate of 8%o, the biodegradation of this wastewater was greatly improved so that bio-treatment is shown to be more efficient by using both IFF and H2O2.