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~ ~ Jl Our information and costs for Resin Adsorption are based on phenol, not r.. COD. If it works on the blowdown, it will cost about $2.0/1000 gals (= S652/acre-ftl, but we cannot ~redict the quality. It will be used in the makeu~ only if it gives an im~roved quality over biological oxidation. Whether it will or not is unknown at this tL~e. Carbon Adsorption may, tentatively, be expected to . 28 29 effluent. Eased an 1973 costs from Hutch~ns ' , we give a good quality 4' found ll~/lb COO removed . Today.s costs are neare: 15~/lb COO. This translates as COO Removed (mg/l) $/1000 gals 10,000 12.5 5,000 6.2 1,000 1.2 500 0.6 Culp and Shuckrow, for very large mur.icipal plants with low COD loadi~~s, found SO.6/1000 gals (= Sl96/acre-ftl. The cost of the use of carbon is so de~endent on the COD that we cannot safely ~redict it. Carbon will only be used if the costs are Wet Oxidation is likely to be a reliable general purpose less than alte~natives_ 31 trea~ent , but che cost will be more ~~an $6/1000 gals ($195~'acre-ft). Wet oxidation can take t~e place of carbon adsorbtion Eor ~gh concen~rations. In sum, in plants having the maximum organic content in the c~oling tower blowdown, a great ~provement in quality can be obtained by biological trea~~ent nf the makeup at a cost of S2.4 to $5.6/1000 gals of blowdcwr,. A better quality probably can be obtained by carbon adsorption or wet oxidative t:ea~ent of the blowdown at more ~~an $6/1000 gals of blowdown. Salt removal will be by forced eva~oration at an additional cost of $6-11/1000 gals. Impoundment with, or without any of the above treatments, costs about $4.60/1000 gals. 2.9 Domes~ic Wastes ~rom Plant A discussion on the quality and treatment of ~astewaters from pctable and domestic usage is found in Section 4.5. The quantity of wastewater is relatively small, about 28 gpm (= 45 acre-ft/yr). 49