Study On Degradation Of Simulated Coking Wastewater With Ozone-Based Advanced Oxidation Processes Intensified By Rotating Packed Bed

Coking wastewater is one of Chinese largest industrial effluents and the coking industry is one of the sectors with the most serious environmental pollution, posing severe threat to the ecological system. Conventional wastewater treatment methods cannot remove organic and ammonia nitrogen pollutants efficiently. In recent years, advanced oxidation processes (AOPs) have received wide attention due to their unique advantages such as the generation of hydroxyl radicals with high oxidizing ability to degrade organic pollutants and no secondary pollution.This paper introduces degradation of simulated coking wastewater with ozone based advanced oxidation processes intensified in HIGEE envioronment, strengthen and microscopic mass transfer between the gas-liquid mixing processes. Combines HIGEE rotating bed (RPB) with O3, O3/H2O2, O3/Fe(Ⅱ), O3/Fenton these four kinds of advanced oxidation process, discover the different operating conditions are simulated coking wastewater main pollutant phenol, aniline, quinoline influence of morpholine and ammonia degradation. Treatment effect is different advanced oxidation method to determine the optimum operating conditions and treated water samples biodegradability, and examine the actual coking wastewater treatment effect. The main findings are as follows:1. Research O3 system, O3/H2O2 system, O3/Fe2+ system and O3/ Fenton processes in simulatied coking wastewater treatment show that:In the test range, COD (chemical oxygen demand) removal and major pollutants of simulatied coking wastewater with rotating bed speed, Fe(II) concentration and pH changes first increased and then decreased in the experimental condition and exists in an optimal value. COD removal rate and the main pollutants of wastewater with the rise in gas flow rate rises, with the rise and fall in the liquid fluid flow.2. In O3/Fenton process coupled treatment simulated coking wastewater, the COD removal and the main pollutant efficiency reaches a maximum, COD removal was 43.57%, NH3-N removal rate was 100%, phenol was 81.56%, aniline was 100%, and quinoline was 81.17%with the initial ozone concentration of 30mg/L, temperature of 25℃, the rotational speed of 1000rpm/min, the gas flow rate of 5 L/min, the liquid flow rate of 20 L/h, the initial pH 6.58, Fe(Ⅱ) concentration of 0.4 mmol/ L and H2O2 concentration of 6.5 mmol/L. The BOD5/COD (B/C) value of simulated coking wastewater is 0.43 above and suitable for biological treatment.3. Degradation of Qian’an actual coking wastewater with ozone based advanced oxidation processed intensified by RPB. When the initial ozone concentration of 30 mg/L in O3/Fenton process, even water sample removal was 62.32%, after aeration water samples was 44.39%; in O3 process, even water sample removal was 36.36%, after aeration water samples was 37.38%. Wastewater B/C at 0.33 or more can be effectively pretreated. The COD removal of Qian’an coking wastewater in the pretreatment stage is generally about 30%. Therefore, ozonation technology can be effectively applied to actual coking wastewater intensified by RPB.