| Emulsion wastewater is one of the high concentration, hard to treat and high risk hazardous waste, which will cause serious problem if discharge into the environment. An environment enterprise in shanghai chemical area which resource utilizes hazardous waste uses physic-chemical and bio-chemical method to treat the emulsion wastewater centralizzedly. Howerer the effluent can not achieve the second class standard of the local standard in Shanghai(DB31/199-2009). Chosing the emulsion biochemical effluent as the research object and studying the ozone advanced oxidation technology and combination technology to the deep treatment of this water. Exploring the degradation effect of organics and the optimal conditions of the O3 single and O3/H2O2 combination technology by using the test experiment. Besides comparing these two kinds of advanced oxidation technology from various angles such as the organic concentration of the effluent, B/C changes, and the organic component changes. Then determine the optimal technology to the treatment of the emulsion biochemical effluent. The results show:The two kinds of advanced oxidation technology are effective to the organic and color. Chosing CODcr and TOC as the evaluation index, results show that the optimal pH of O3 single and O3/H2O2 combination technology are 7 and 11 respectively; the optimal ozone flow rate are both 0.5L/min, the ozone adding rate of O3 single and O3/H2O2 combination technology are 30mg/min and 31mg/min respectively; the optimal n[H2O2]/n[O3] of O3/H2O2 combination technology is 0.5; the optimal H2O2 adding way is sequence adding. Then using the optimal conditions to treat the emulsion biochemical effluent of O3 single and O3/H2O2 combination technology respectively. The results show:For O3 single technology, when the treating time is 300min. the concentration of CODcr and TOC are 200.6mg/L and 103.6mg/L respectively which can not achieve the DB31/199-2009, for O3/H2O2 combination technology, when the treating time is 120min, the concentration of CODcr and TOC are 82.3mg/L and 28.7mg/L respectively which are already achieve the DB31/199-2009.Comparing O3 single and O3/H2O2 combination technology from various angles, the results show:In a certain treating time, the change of the effluent’s pH treating by the two kinds of advanced oxidation technology are different over time, the former’s pH trend is declining, the pH is always less than 4, but the latter’s pH trend is first declining then up, the pH is between 7-9;the O3 single technology’s ozone utilize rate is lower than O3/H2O2 combination technology; Then the two kinds of advanced oxidation technology are able to improve the B/C of the effluent, in the late stage of the reaction, but the O3/H2O2 combination technology is more efficient to the removal of CODcr and BOD5; Besides the organic component of the O3 single technology has big molecular weight and more complex structure than the organic component of the O3/H2O2 combination technology; So the O3/H2O2 combination technology is better than the O3 single technology.We conclude that the O3/H2O2 combination technology is widely apply to the daily different emulsion biochemical effluent through the treatment of the emulsion biochemical effluent by the O3/H2O2 combination technology continuously. So the O3/H2O2 combination technology has certain breakthrough in the field of the hard degradation organic wastewater, it’s an appropriate technology to the deep treatment of emulsion biochemical effluent. |
