Sludge Disposal Dallas Style

by Jack L. Moseley, Operations Manager; Lockwood, Andrews and Newman Inc., Dallas, TX,
Larry N. Patterson, (M.ASCE), Member; Dallas Wastewater Treatment Capital Improvements Program, Dallas, TX,
Ronald B. Seiger, Sr. Envir. Engr. and Project Mgr.; CH2M Hill, Dallas-Ft. Worth, TX,


Serial Information: Civil Engineering—ASCE, 1990, Vol. 60, Issue 8, Pg. 50-52


Document Type: Feature article

Abstract:

Dallas, Tex. has discovered that sludge disposal can coexist with environmental concerns. Dallas Water Utilities treats some 200 million gpd, sending the effluent from one of the two treatment facilities to the other, the Southside Plant, where the sludge was disposed of on-site by liquid injjection into dedicated land disposal fields. In 1985 a Sludge Master Plan was adopted that recommended anaerobic digestion of all sludges, mechanical dewatering and sludge disposal by three methods: 1) on-site dedicated land disposal, 2) on-site sludge-only monofill, and 3) composting. Under this Plan, a new facility, the first phase of a $90 million project had been constructed. The design team retained by the city confirmed that these methods would be the most cost effective. Their design includes several innovations that have attracted observers to the plant. Included are flexibility through use of the three methods, a soil-slurry cutoff wall around the plant site perimeter and another slurry cutoff wall around the sludge monofill, and belt filter presses that dewater the sludge using polymer as a coagulant aid. Mixing the sludge with soil in a pug mill prior to disposal, pre-testing dewatering equipment prior to award, contracting operation of the monofill to private company are also included.

Subject Headings: Sludge | Water treatment plants | Diaphragm walls | Soil mixing | Land use | Dewatering | Utilities | United States | Texas

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