The Application Of Fenton/SBR Process In The Treatment Of Extracted Macleaya Cordata Wastewater

Extracted macleaya cordata wastewater has some typical features of pharmaceutical wastewater, such as complex ingredient, high CODcr, deep chromaticity, poor biodegradability. As the growth of microorganisms has been inhibited by the residual macleaya cordata in the wastewater, the traditional biological treatment was difficult to achieve the desired treatment effect. Aerobic process couldn't treat successfully as a post-processing extracted macleaya cordata wastewater, which was still concentration high and refractory even after treated by ABR. Therefore, it is necessary to find effective, sustainable approach. Even though AOPs have been shown to be highly efficient, their operation is still quite expensive, especially for the treatment of highly polluted wastewater. An attractive option is a short pretreatment with an AOPs, which makes the recalcitrant pollutants biodegradable intermediates that can then be degraded in a biological process whose operation expense is much low. A combined AOPs and biological oxidation system has widespread attracted international experts'attention.The characteristics of the treatment process for extracted macleaya cordata wastewater by using Fenton/SBR combined technology was investigated at room temperature. When the CODcr concentration in the influent was at 7300 mg·L-1, the optimal Fenten reaction conditions for the process was determined through the number of single-factor test:initial pH was 3.0, [H2O2] to [Fe2+] molar ratio was 15, and H2O2 dosage was 7300 mg·L-1. In addition, Fenton reagent dosing method could not affect the CODcr removal rate, but as the stirring rate increased, the CODcr removal rate improved. Under those conditions and after 120min treatment,65.3% CODcr removal could be achieved and BOD5/CODcr was enhanced from 0.14 to 0.22, which showed the biodegredability was improved obviosusly. Meanwhile, following the treament by SBR process, the CODcr in the effluent could be controlled to less than 500 mg·L-1 (the third class national discharge standard), which indicated that this combined Fenton with SBR process could be a competitive technology for extracted macleaya cordata wastewater treatment. The research for recycling the iron sludge also has been investigated. The results showed that the iron sludge is reusable. Wastewater of the recycling process could meet the third class national discharge standard after being treated by SBR.