A tungsten recovery method including leaching tungsten while suppressing leaching of silicon by using a weak alkali compound with respect to a tungsten raw material containing silicon with tungsten oxide, separating most of the silicon as a residue during the leaching of the tungsten, and recovering a tungsten leachate having an extremely low silicon concentration.

A tungsten recovery method including leaching tungsten while suppressing leaching of silicon by using a weak alkali compound with respect to a tungsten raw material containing silicon with tungsten oxide, separating most of the silicon as a residue during the leaching of the tungsten, and recovering a tungsten leachate having an extremely low silicon concentration.

The present disclosure belongs to the technical field of treating landfill leachate, and in particular to a system and a method for total volume treatment of landfill leachate, and a use thereof. The system comprises an integrated device of dielectric barrier discharge combined with catalyst treatment, an SBR-MBR biochemical treatment device and a PLC control device; the integrated device for a discharge barriered by dielectric and a catalysis treatment is communicated with the SBR-MBR biochemical treatment device through a water transport pipeline, and the PLC control device is respectively connected with the integrated device for a discharge barriered by dielectric and a catalysis treatment and the SBR-MBR biochemical treatment device through connecting lines.

Waste solidification compositions and methods of using them repurpose calcium-containing industrial by-products. The compositions comprise either 1) a) auto shred residue; and b) a particulate wood-based product, or 2) a) a solid, particulate calcium-containing compound; and b) a superabsorbent material. The method of repurposing a solid, particulate calcium-containing industrial by-product comprises a) blending the by-product with a superabsorbent material to form a waste solidification composition; b) adding the waste solidification composition to a liquid industrial waste stream; and c) allowing the waste solidification composition to absorb at least 1 times its weight of the liquid industrial waste stream to form a solid waste product. The solid waste product passes Paint Filter Liquids Test Method 9095B.

Organic waste is polished to remove floatable contaminants prior to being biologically treated. In one application, pressed organic waste is polished before being sent to a wet anaerobic digester, optionally to be co-digested with wastewater treatment plant sludge. The organic waste is polished by flinging globs of the organic waste against a screen while flowing air across the flinging globs. The polishing can be performed in a device having a rotor with discrete paddles inside of a cylindrical screen.

A method of rapid treatment of heavy metal sludge and preparation of ferrite magnets comprises following steps of: providing a sludge, the sludge at least having zinc metal and ferrous metal; adding an iron-containing substance to the sludge; pickling the sludge and the iron-containing substance with sulfuric acid to obtain a pickling solution with zinc ions and iron ions; neutralizing the pickling solution with sodium hydroxide to form hydroxide precipitates; and airing and heating the neutralized pickling solution by an ultrasonic-microwave method so that the hydroxide precipitates undergoing a ferrite magnet reaction, thereby obtaining ferrite magnets with a spathic structure.

Embodiments of the present invention may provide encapsulation of waste (2) materials in a first (1), double (5), triple (7), or even quadruple (44) encapsulation. Encapsulation may include waste (2), ash (4), Portland cement (3), water, chemicals, or the like. Agglomerates formed perhaps with high energy mixing may be processed, cured, or the like.

This invention refers to a method for preparing a chemical digester characterized by using organic and inorganic elements used for multiple purposes such as an accelerator in the decomposition of organic matter, as a water flocculant, as an organic soil fertilizer and as a means to eliminate the concentration of flies and other inserts in organic matter to decompose. The method comprises heating water in a reactor at a temperature of 38° C., adding a polysaccharide, an anti-thickener and an antifoam. The method then comprises the addition of two organic acids, one of them previously mixed in a second reactor and, finally, an inorganic acid until the mixture is homogenized. Optionally the method comprises the packaging of the mixture and the treatment of organic matter.

The present disclosure relates to a system and process for separating sand and gravel in sediments of a sewage pipe network and recycling organic matters. The system includes a conveying grid plate, a mud outlet is provided below the conveying grid plate, and a masonry conveying area is provided at one side of the conveying grid plate; a fiber crushing tank, disposed below the mud outlet, and a crushing device is disposed below the mud outlet; a masonry scouring and recycling tank, provided with an interception grille located at one side of the masonry conveying area, a flushing device is disposed above the interception grille, a masonry outlet is provided in the masonry scouring and recycling tank, the masonry scouring and recycling tank is communicated with a muddy water return pipe, and the muddy water return pipe is communicated with the mud outlet.

The crude oil sludge treatment agent is mixed with crude oil sludge and water and used for treatment of the crude oil sludge under alkali conditions. The crude oil sludge treatment agent contains green rust. The crude oil sludge treatment agent may further contain either or both a metal and a metal ferrite. The metal and the metal of the metal ferrite are one or more selected from the group consisting of aluminum, yttrium, zinc, copper, tin, chromium and silicon. The crude oil sludge treatment agent may also contain one or more selected from the group consisting of aluminum ferrite, yttrium ferrite and zinc ferrite. The crude oil sludge treatment method includes a mixing step in which crude oil sludge, water and green rust are mixed under alkali conditions.