A biosolids cake treatment process comprising mixing a biosolids cake having more than 10% solids with an alkali to bring the mixture's pH to 11 or higher, heating the mixture to 80 C. or more and dewatering the heated mixture. The dewatered product can be used as a fertilizer and the separated liquid fraction can be fed back to digesters. The alkali can be one or more of or a mixture of calcium oxide (CaO), calcium hydroxide (CaOH), and lime.

Methods and systems for treating oil sands tailings streams at an elevated pH using lime are disclosed herein. In some embodiments, the method comprises providing a tailings stream including 10-55% solids by total weight, increasing the pH of the tailings stream by combining the tailings stream with lime to produce a lime-tailings mixture having a pH of at least 11.0, and dewatering the lime-tailings mixture to produce a first stream having 10% or less solids by total weight and a second stream having 50% or more solids by total weight. The first stream can correspond to a release water stream, and the second stream can correspond to a cake. The lime slurry can include about 10% lime by total weight, and can comprise lime hydrate, quicklime, or a combination thereof. Dewatering the lime-tailings mixture can include routing the lime-tailings mixture to a centrifuge unit and/or a pressure or vacuum filtration unit.

The present invention relates to an active substance for sewage treatment and dewatering of solid domestic wastes landfills. Besides, the present invention also relates to a method for producing this active substance. More specifically, the present invention relates to use of this active substance for sewage treatment and dewatering of solid domestic wastes landfills to remove organic impurities, organogenic elements, solid and radioactive metals.

The present invention relates to an active substance for sewage treatment and dewatering of solid domestic wastes landfills. Besides, the present invention also relates to a method for producing this active substance. More specifically, the present invention relates to use of this active substance for sewage treatment and dewatering of solid domestic wastes landfills to remove organic impurities, organogenic elements, solid and radioactive metals.

In a method for disintegrating organic substrates, an alkaline solution is added as pH-altering solution to the substrate and said substrate is then treated with steam, or steam is added, for heating to a temperature below 100 C. Under pressureless conditions, the heated substrate admixed with alkaline solution is subjected to a residence time. Preferably, the organic substrates are sludges from wastewater treatment plants.

The present invention relates to a process for treating primary sludge in a wastewater treatment plant, comprising the steps of admixing an organic coagulant and/or polymer to wastewater; allowing a primary treatment of the wastewater in the presence of the organic coagulant or polymer; separating solids as a primary sludge from said primary treatment; and dewatering the primary sludge. The present invention further relates to a method of improving primary sludge dewaterability and improving energy balance of a wastewater treatment plant.

The present invention relates to a process for treating primary sludge in a wastewater treatment plant, comprising the steps of admixing an organic coagulant and/or polymer to wastewater; allowing a primary treatment of the wastewater in the presence of the organic coagulant or polymer; separating solids as a primary sludge from said primary treatment; and dewatering the primary sludge. The present invention further relates to a method of improving primary sludge dewaterability and improving energy balance of a wastewater treatment plant.

A filter assembly separating organic waste from water includes a first annular filter element defining an axis. The first annular filter element is defined by a first annular coil of flat wire and an optional second filter element is defined by a second annular coil of flat wire, being generally helical in the axial direction. A cylindrically or frustoconical filter membrane is concentrically disposed between the first and second annular filter element. The filter membrane is porous having aperture size of less than a nano-particulate size of the organic waste, but greater than a nano-particulate size of the water molecule. The second annular filter includes adjustable porosity for selectively preventing particles from reaching the filter membrane and selectively cleaning the membrane by reversed flow of water through the membrane. The assembly generates radial and distal flows and differential pressure forces, for use in high throughput industrial, agricultural and municipal facilities.

A filter assembly separating organic waste from water includes a first annular filter element defining an axis. The first annular filter element is defined by a first annular coil of flat wire and an optional second filter element is defined by a second annular coil of flat wire, being generally helical in the axial direction. A cylindrically or frustoconical filter membrane is concentrically disposed between the first and second annular filter element. The filter membrane is porous having aperture size of less than a nano-particulate size of the organic waste, but greater than a nano-particulate size of the water molecule. The second annular filter includes adjustable porosity for selectively preventing particles from reaching the filter membrane and selectively cleaning the membrane by reversed flow of water through the membrane. The assembly generates radial and distal flows and differential pressure forces, for use in high throughput industrial, agricultural and municipal facilities.

Systems and methods for intensive recirculating aquaculture are provided herein. An example system includes water sourced from a first segment of a saline aquifer, a recirculating aquaculture system receiving the sourced water and producing discharge water, and a water discharge point located within second segment of the saline aquifer disposed below the first segment of the saline aquifer.