Study on the treatment of trace petroleum and dissolved organic matter in mine water by ozone oxidation

LIU Liangping; ZHANG Kai; ZHANG Jiachen; GUO Hongwei; MA Tao; LI Chenyu

doi:10.3969/j.issn.1007-7677.2025.01.005

Abstract：Coal mine water has high dissolved organic matter due to the flow through the coal mining roadway and working face,but is still susceptible to contamination by coal and motor oil.It is necessary to use ozone oxidation technology to achieve the removal of petroleum in mine water while taking into account the removal of dissolved organ-ic matter.Combined with the ozone oxidation experimental process,by adjusting the contact oxidation time between ozone and wastewater,the correlation analysis of the content and removal rate of CODCr and petroleum in the effluent water after ozone contact oxidation treatment was carried out according to the three phases:long-term few times,short-time multiple times,and sampling testing.The results showed that:there was a significant effect of contact re-action time on the effect of ozone oxidation of petroleum in mine water,the longer the contact reaction time,the low-er the petroleum in the water,the better the treatment effect;but from the economic point of view,it is not possible to prolong the action of the time indefinitely.When the ozone amount was 40 mg/L and the reaction water volume was 0.5 m3/h,the optimal reaction contact time was 40 min.The highest removal rate of petroleum and dissolved organic matter was 29.63%and 19.91%.Under this reaction time,petroleum and CODCr could reach the best reaction effi-ciency and removal effect concurrently.The effective contact reaction time was controlled at 40-60 min to make the trace petroleum in mine water lower than 0.4 mg/L and reach the treatment standard.