Abstract: In a wastewater treatment process involving in-line removal of settled solids through a submerged solids collection manifold, the invention provides devices (and methods?) for resuspending concentrated solids using hydraulic pressure waves to improve removal through the collection manifold. The pressure waves are preferably created by cycling on/off signals to the solids collection pump at a user selected frequency. In some applications resuspension is provided by air scouring. The inventions result in improved solids removal and longer run times for the treatment processes with reduced need for mechanical agitators or scrapers.

Abstract: In a wastewater treatment process involving in-line removal of settled solids through a submerged solids collection manifold, the invention provides devices (and methods?) for resuspending concentrated solids using hydraulic pressure waves to improve removal through the collection manifold. The pressure waves are preferably created by cycling on/off signals to the solids collection pump at a user selected frequency. In some applications resuspension is provided by air scouring. The inventions result in improved solids removal and longer run times for the treatment processes with reduced need for mechanical agitators or scrapers.

Abstract: In a wastewater treatment process involving activated sludge, the invention provides a method for improving suspended solids removal without the need for chemical coagulants. Improved solids removal is obtained through the reintroduction of return activated sludge as a natural flocculent prior to tertiary filtration. In some applications algal solids can be pre-filtered from equalization or detention ponds and lagoons by return activated sludge addition followed by mixing and high solids filtration. The inventions result in improved solids removal and longer run times for the treatment processes with reduced need for chemical coagulants.

Abstract: In a wastewater treatment process involving activated sludge, the invention provides a method for improving suspended solids removal without the need for chemical coagulants. Improved solids removal is obtained through the reintroduction of return activated sludge as a natural flocculent prior to tertiary filtration. In some applications algal solids can be pre-filtered from equalization or detention ponds and lagoons by return activated sludge addition followed by mixing and high solids filtration. The inventions result in improved solids removal and longer run times for the treatment processes with reduced need for chemical coagulants.

Abstract: In a wastewater treatment process involving in-line removal of settled solids through a submerged solids collection manifold, the invention provides devices (and methods?) for resuspending concentrated solids using hydraulic pressure waves to improve removal through the collection manifold. The pressure waves are preferably created by cycling on/off signals to the solids collection pump at a user selected frequency. In some applications resuspension is provided by air scouring. The inventions result in improved solids removal and longer run times for the treatment processes with reduced need for mechanical agitators or scrapers.