The Houston Solution: Advanced Treatment and Sludge Reclamation
Public Works Vol 109, No 2, p 104, February, 1978
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A two-stage activated sludge plant has been selected for treating waste water from a 53,500 acre section of Houston, Texas, containing one-third of the city 's population and most of the business district. The first stage of the plant, following degritting and trash removal, reduces carbonaceous BOD by the activated sludge process. The second stage promotes nitrification with pure oxygen generated on-site in a cryogenic oxygen plant. The waste water then flows by gravity through rapid media filters followed by chlorination and discharge to the Buffalo Bayou and the Houston Ship Channel. The sewage sludge is thickened, aerobically digested, dewatered by vacuum filtration, and dried. An average of 112 tons/day of sludge is processed at the plant which has provisions for a peak capacity of 140 tons/day. The processed sludge is sold as commercial fertilizer. Sixty million dollars of the $220 million plant was allocated for the sludge processing plant. (Lisk-FIRL)
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