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<br />K". <br />~ <br />:,.,) <br />-J <br /> <br />It has been conclusively demonstrated that refiner! phenolic wastewaters <br /> <br />can be used in a cooling tower and that bio-oxidation of phenol will occur <br /> <br />with very high removal efficiencies. This has been practiced <br />refinery in Toledo, Ohioll, at the Mobil Oil refinery in East <br />other refineries according to a brief note by Maguire of Betz <br />Table 2-6 brings together some of the pertinent information. <br />!t must be remembered that "phenol" in a refiner] sour water probably <br /> <br />at the Sun Oil <br /> <br />h. 12 d <br />C ~cago an at <br /> <br />. 13 <br />Laboratorl.es . <br /> <br />contains a higher fraction of C6M50M ~~an will be <br /> <br />wastewater, so the ~'aloqy is less than perfect. <br /> <br />found in the coal conversion <br />d ll.c, 'f' d <br />Mohler an Clere ].. ent~ ~e <br /> <br />several species of bacilli and cocci in their tower; five species utilized 200 <br />ppm phenol and two of the five grew in 1000 ppm phenol/mineral salts medium. <br />The bacteria were mescphilic with optimum growth in ehe range 6C-IOooF. <br />12 <br />.Hart reports ~at his towers operated at BO-56'F. <br /> <br />Necessar;r <br /> <br />conditions for <br />13 <br />suggested ), <br /> <br />successful bio-oxidation are low sulfidell <br />and only slow, small excursions in pHll <br /> <br />(below 2 ppm is <br /> <br />References 11 and 12 report a pH range of 7.8 to about B.3. Hydrogen sulfide <br />~s lowe~ in this ~ater than in stri~ped refinery sour water. <br />Chlori~ation to prevent slime was used at MObil12, but had"to ce ca~efully <br />controlled to maintain bioxidation. Maquire13 reports similarly anc suggests <br />the use of acrolein or other non-oxidizing biocide to prevent t~e =ormation of <br />toxic chlorinated phenols. We =eccmmend not using chlorine =or coal conversivn <br />wastewaters beca~Ee of ~~e possible release of chlorinated aromatic ccmpounds. <br />~ost of the suppliers of proprietar~ chemical mixtures can supply biocides <br />other ~~an chlori~e and control of slime will not be a problem. <br />Corrosion of steel has ~een low at both Mobil and Sun Oil_ Low corrosion <br />18 <br />is also experienced when treated sewage is used in a cool~ng tower <br />Before setting quality limits on the organic contamination of water used <br />in cooling system makeup, an exa~ple can be considered_ The Lurgi process <br />plant designed by El Paso to make 250 K 106 sef/day pipeline gas in Ne~ MeKico <br />3 <br />will require cooling water makeup of about 1,500 x 10 lb/hr (= 3,000 gal/min <br />= 4,830 acre-ft/yr) ,0\ of which will be treated process condensate. The <br />quality of treated process condensate is not ?recisely known, ~ut ~~O estimates <br />