Integrated Method of Ozonation and Anaerobic Process for Treatment of Atrazine bearing Wastewater

Integrated Method of Ozonation and Anaerobic Process for Treatment of Atrazine bearing Wastewater

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The paper presents the treatment of atrazine-contaminated wastewater by ozonation followed by an anaerobic process using Upflow Anaerobic Sludge Blanket (UASB) reactor.The experiment was performed with 100 ppb synthetic solutions of atrazine prepared in ultra-pure water.The corresponding initial Chemical Oxygen Demand (COD) is 226 mg.L-1.

The initial pH was adjusted to 9.5.The atrazine-bearing synthetic wastewater was ozonated with an ozone dose of 9.4mg/l for 40 minutes of optimum ozonation time, resulting in a 35% reduction in the initial concentration of atrazine.

Along with atrazine reduction, there was a COD removal of 54.42%.Further, it was degraded with an anaerobic process, resulting kicker pro comp 10 in the final reduction in atrazine concentration of 81% and the corresponding removal in COD of 86.7%.

The process of ozonation led to the mineralization of atrazine and enhancement in the biodegradability of the wastewater.Using ion chromatography, the ozonated wastewater sample was analyzed for ionic by-products before and after ozonation.The ion chromatography results showed the breaking of the atrazine compound and the formation of Cl-, NO3-, SO42-, and F- as intermediate products.Further, the BOD5/COD 220.10.38.20.02.001 ratio increased, reflecting the increased biodegradability.

This ozonated wastewater was treated in a UASB reactor where the pesticide was degraded to 19 ppb, and COs degraded to 30 mg.L-1.The overall removal of atrazine pesticide and COD were 81% and 86.7%, respectively, in the integrated system of ozonation followed by anaerobic degradation.