广州(o)污水处理工作s—No. 2.
All masonry has been cleaned of mortar and treated with three coats of Portland cement wash, which makes a clean hard
surface impervious to moisture and has endured the frosts of the winter without scaling. The effluent chamber is five feet wide and 12 feet long, of brick masonry laid in the same manner and with same final treatment. The steps in this chamber are Berea sandstone sawed to exact dimensions and imbedded in the side walls. The sludge pump well is to feet inside diameter and 18 feet deep, having 16-inch brick walls and bottom. This well has a capacity of 700 cubic feet sludge to its flow line, the admission of which is controlled by an 18-inch sluice gate with hand wheel and standard and operated from above. Midway between the two pairs of tanks and under the centra! channel wall is located an 18 -inch diameter sludge drain connecting with the sludge well and having a twelve-inch branch to each tank, and controlled by a twelve-inch gate valve. At one side of this drain, but at a level, twentyfour inches higher, is an eighteen-inch clear water drain connected to the tanks by eightinch branches, this drain delivering the supernatant water of each tank, at such times as they may be cleaned, to the effluent chamber discharging under the stone steps by means of eight-inch connections, and at the lower end of the sludge channel in the tanks and to these is attached an eight-inch valve and an eight-inch swing joint together with two elbows and eight feet of galvanized iron pipes with floats, forming a floating skimmer pipe, to draw off the supernatant water of each tank from the surface till the sludge is reached. The floating skimmer pipes, with their valves, and also the sludge valves are operated by hand wheels from a platform overhanging the tank walls.
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