Abstract: A method and apparatus for cleaning a membrane module, the membrane module having a plurality of porous membranes, the membranes being arranged in close proximity to one another and mounted to prevent excessive movement therebetween and means for providing, from within the module, by means other than gas passing through the pores of the membranes, gas bubbles entrained in a liquid flow such that, in use, the liquid and bubbles entrained therein move past the surfaces of the membranes to dislodge fouling materials therefrom, the gas bubbles being entrained in the liquid by flowing the liquid past a source of gas to draw the gas into the liquid flow. The gas bubbles are preferably entrained into the liquid using a venturi type device. The membranes are preferably partitioned into discrete groups to assist cleaning while maintaining high packing density.

Abstract: A method and apparatus for cleaning a membrane module, the membrane module having a plurality of porous membranes, the membranes being arranged in close proximity to one another and mounted to prevent excessive movement therebetween and means for providing, from within the module, by means other than gas passing through the pores of the membranes, gas bubbles entrained in a liquid flow such that, in use, the liquid and bubbles entrained therein move past the surfaces of the membranes to dislodge fouling materials therefrom, the gas bubbles being entrained in the liquid by flowing the liquid past a source of gas to draw the gas into the liquid flow. The gas bubbles are preferably entrained into the liquid using a venturi type device. The membranes are preferably partitioned into discrete groups to assist cleaning while maintaining high packing density.

Abstract: There is provided a non-metallic sludge collector chain comprising at least one center block link comprising a first bore at a first end of the center block link and a second bore at a second end of the center block link, at least one insert sidebar comprising a first bore at a first end of the insert sidebar and a second bore at a second end of the insert sidebar, at least one receiving sidebar comprising a first bore at a first end of the receiving sidebar and a second bore at a second end of the receiving sidebar, a pin comprising a first end portion, a second end portion, and a central portion disposed between the first and second end portions, the second end portion having a grooved section, the pin being positioned through the first bore of the insert sidebar, through the first bore of the center block link, and through the first bore the receiving sidebar, and a pin cap comprising a sleeve having a raised ring protuberance thereon, the raised ring protuberance being in snapped-fit relation to the groov

Abstract: There is provided a sprocket for use in a wastewater treatment facility comprising a first portion, a second portion, and at least one fastener which snap locks the first portion to the second portion. There is also provided a sprocket for use in a wastewater treatment facility comprising at least one lightening hole, the sprocket being formed of non-metallic material.

Abstract: The present bearing assembly is for use with a wastewater treatment apparatus which is driven by a drive shaft, e.g., cog rake bar screens, or water treatment apparatus, e.g., paddle wheels in flocculation mixing tanks, and submerged, partially submerged or intermittently submerged in a fluid environment. The bearing assembly includes a tubular member keyed against rotation in a bearing housing with the tubular member bore surfaces engaged against the drive shaft surfaces without rolling elements disposed therebetween thus eliminating the need for lubricators to supply the bearings with grease. Accordingly, the present dry bearing assembly is not subject to failures caused by having the grease in the bearings flushed out by wastewater flows or by submerging of the lubricator.