A rotary screen separator includes a screen having a substantially cylindrical shape extending from a feed end to a discharge end along a horizontal longitudinal axis. The screen is perforated in a plurality of discrete regions. The regions including at least a first perforation region wherein the screen is perforated in a first perforation pattern and a second perforation wherein the screen is perforated in a second perforation pattern. The first perforation pattern is sized to allow liquid and finer particulate matter to pass through the perforations and the second perforation pattern is sized to allow liquid and coarser particulate matter to pass through the perforations in the second perforation pattern. A first vane structure is helically shaped at a first vane depth having a first vane pitch and handedness selected to advance feedstock within the screen as the screen is rotated in operation.

The invention discloses a waste water filtering garbage drying apparatus, comprising a main body, a feeding inlet is fixed on an upper end surface of the main body, and a drying device is arranged on a lower side of the feeding opening, and the drying device can be used by the drying device The garbage entering the feed inlet is subjected to the first step of dry dewatering, and the lower side of the drying device is provided with a gate device. The present invention adopts a multi-stage drying method, and firstly dehydrates the garbage to remove a large amount of water, and then In the purpose of drying the remaining moisture by heating and taking away the moisture through the air flow, the overall footprint of the device is small, no large number of people are involved, the drying speed is fast, the drying effect is good, the working efficiency is improved, and the weather is not affected by the rainy weather. Can work at any time.

The invention discloses a waste water filtering garbage drying apparatus, comprising a main body, a feeding inlet is fixed on an upper end surface of the main body, and a drying device is arranged on a lower side of the feeding opening, and the drying device can be used by the drying device The garbage entering the feed inlet is subjected to the first step of dry dewatering, and the lower side of the drying device is provided with a gate device. The present invention adopts a multi-stage drying method, and firstly dehydrates the garbage to remove a large amount of water, and then In the purpose of drying the remaining moisture by heating and taking away the moisture through the air flow, the overall footprint of the device is small, no large number of people are involved, the drying speed is fast, the drying effect is good, the working efficiency is improved, and the weather is not affected by the rainy weather. Can work at any time.

A method is disclosed for dewatering of sludge from a pulp, paper or board making process, such as deinking sludge, including obtaining of an aqueous sludge including an aqueous phase and a fibre material suspended in the aqueous phase. The sludge is subjected to a pre-thickening step, where a first part of the aqueous phase is removed from the sludge and to a pressing step, where a second part of the aqueous phase is removed from the sludge, thereby obtaining a dry pressed sludge. Before or at the pre-thickening step a polymer composition having a charge density of at the most 1.7 meq/g, preferably at most 1.5 meq/g, more preferably at most 1.1 meq/g, is added to the sludge.

A method is disclosed for dewatering of sludge from a pulp, paper or board making process, such as deinking sludge, including obtaining of an aqueous sludge including an aqueous phase and a fibre material suspended in the aqueous phase. The sludge is subjected to a pre-thickening step, where a first part of the aqueous phase is removed from the sludge and to a pressing step, where a second part of the aqueous phase is removed from the sludge, thereby obtaining a dry pressed sludge. Before or at the pre-thickening step a polymer composition having a charge density of at the most 1.7 meq/g, preferably at most 1.5 meq/g, more preferably at most 1.1 meq/g, is added to the sludge.

A method and apparatus for direct drying of inorganic sludge with a drum drawing process, comprising the following steps: 1) drum mixed drying of slag and sludge: respectively conveying the slag and sludge into a drum (1) in proportion, completing mixing, heat exchange, dehydration, cooling and crushing of the slag and sludge under the rolling action of the drum (1) and a steel ball to achieve cooling, crushing and drying of the slag and sludge, and directly discharging the obtained mixture; 2) slag and sludge separation: separating the steel slag and dry sludge in a manner of combining screening and rotary separation; 3) tail gas treatment: treating dusts, sulfides and organic compounds in tail gas generated by the dry sludge by using wet alkali washing and activated carbon adsorption, and discharging the treated tail gas; and 4) tailing sludge treatment: generating steam and dusts in the drum treatment of the slag and sludge, allowing dusts to enter a tail gas treatment device (4) with steam, aggregating the dusts after wet washing or spraying, and then conveying into a tailing sludge blending device (5) by means of a conveying device, mixing and stirring the tailing sludge and original sludge, conveying the obtained mixture into the drum (1), and drying the mixture to realize zero discharge of undried sludge.

A method and apparatus for direct drying of inorganic sludge with a drum drawing process, comprising the following steps: 1) drum mixed drying of slag and sludge: respectively conveying the slag and sludge into a drum (1) in proportion, completing mixing, heat exchange, dehydration, cooling and crushing of the slag and sludge under the rolling action of the drum (1) and a steel ball to achieve cooling, crushing and drying of the slag and sludge, and directly discharging the obtained mixture; 2) slag and sludge separation: separating the steel slag and dry sludge in a manner of combining screening and rotary separation; 3) tail gas treatment: treating dusts, sulfides and organic compounds in tail gas generated by the dry sludge by using wet alkali washing and activated carbon adsorption, and discharging the treated tail gas; and 4) tailing sludge treatment: generating steam and dusts in the drum treatment of the slag and sludge, allowing dusts to enter a tail gas treatment device (4) with steam, aggregating the dusts after wet washing or spraying, and then conveying into a tailing sludge blending device (5) by means of a conveying device, mixing and stirring the tailing sludge and original sludge, conveying the obtained mixture into the drum (1), and drying the mixture to realize zero discharge of undried sludge.

A feed system for a rotary screen separator has a feed housing and a feed lid movably attached to the feed housing. The feed housing has a feed chamber, an inlet opening, and an outlet opening. The feed chamber defines a proximal portion adjacent to the inlet opening and a distal portion at least a portion of which is adjacent to the an outlet opening. A cross-sectional area of at least a portion of the proximal portion is greater than a cross-sectional area of the distal portion. The feed lid is movably attached to the feed housing such that the feed lid covers the outlet opening in a closed position, and does not cover the outlet opening in at least one open position.

At least one method and system for pre-treating wastewater is described. The method generally involves providing high strength wastewater and waste activated sludge from a wastewater treatment plant to a first reactor, forming a mixed liquor therefrom, aerating the mixed liquor, allowing the aerated mixed liquor to settle to form a clarified supernatant and a biomass, and providing the clarified supernatant to a liquid treatment train of the wastewater treatment plant. After allowing the mixed liquor to settle into the clarified supernatant and the biomass, the biomass may be provided to a second reactor, aerated, and provided to a solid treatment train of a wastewater treatment plant. The system generally includes a first reactor, a second reactor and optionally, a mechanical sludge thickening apparatus that are coupled to a high strength wastewater source and a wastewater treatment plant having a liquid treatment train and a solid treatment train.

A feed system for a rotary screen separator has a feed housing and at least one feed lid movably attached to the feed housing. The feed housing has a feed chamber, an inlet opening, and at least one outlet opening. The feed chamber defines a proximal portion adjacent to the inlet opening and a distal portion at least a portion of which is adjacent to the at least one outlet opening. A cross-sectional area of at least a portion of the proximal portion is greater than a cross-sectional area of the distal portion. The at least one feed lid is movably attached to the feed housing such that the at least one feed lid covers the at least one outlet opening in a closed position, and does not cover the at least one outlet opening in at least one open position.