| During the Eleventh Five-Year Plan, a 100 kt/a emulsion styrene-butadiene rubber(SBR) project is in full swing along with the completion and going into operation of 700 kt/a ethylene plant and its auxiliary projects in Lanzhou Petrochemical Company. A great quantity waste water from the production of SBR contains higher concentration organic matter , consists of uncoagulated micromolecular polymer in the main and some unbiodegradable organic matter. It is difficult to treat the waste water with biodegradatied technique owing to its lower value of B/C(usually below 0.3). To economize on water resource and protect water environment, the waste water must be treated. All of treated waste water can be used as supplementary water for circulating cooling device in view of the establishment of 15 kt/h circulating water plant by Lanzhou Petrochemical Company.The de-electric charge adsorption(DEA) waste water treatment technique was chosen including de-electric charge adsorption, hydrolytic acidation and contact oxidation techniques according to present conditions of waste water from the SBR production and its requirements of circulating use, as well as analysis of current treatment technologies at home and comparison with waste water treatment methods in common use. After the process optimization of DEA technique by 1 m~3 scale pilot test, the process chosen finally was as follows: railings sump+adjusting chamber of pH value+buffering pit+DEA reaction+ hydrolytic acidation+ contact oxidation+the secondary precipitator+carbon biofiltration+sand filtration+antipoisoning with chlorine dioxide. The quality of result water treated by using this technical process satisfied the requirements of supplementary water described in " Code for design of waste water reclamation and resuse" (GB 50335—2002) for circulating cooling water, so all of treated water could be used as supplementary water for circulating cooling device.
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