The present invention relates to a method of dewatering an aqueous mineral suspension comprising introducing into the suspension a flocculating system comprising a mixture of polyethylene glycol and polyethylene oxide polymers, in particular a mixture of one or more low molecular mass polyethylene glycol with one or more high molecular mass polyethylene oxide. Said mixture of polyethylene glycol and polyethylene oxide polymers is useful for the treatment of suspensions of particulate material, especially waste mineral slurries. The invention is particularly suitable for the treatment of tailings and other waste material resulting from mineral processing, in particular, the processing of oil sands tailings.

THIS invention relates to a method of disposing of residues from the comminution and processing of ores. The method includes the steps of classifying the processing residues into a water permeable sand fraction and a tailings fraction and depositing the tailings fraction and the sand fraction to form a multilayer structure contained by at least one containment wall (14) with the sand fraction forming continuous channels (12) through the tailings fraction (10) to allow water contained in the tailings and sand to flow by gravity, through the sand channels, to water discharge points (16), and recovering the water (18) from the water discharge points.

THIS invention relates to a method of disposing of residues from the comminution and processing of ores. The method includes the steps of classifying the processing residues into a water permeable sand fraction and a tailings fraction and depositing the tailings fraction and the sand fraction to form a multilayer structure contained by at least one containment wall (14) with the sand fraction forming continuous channels (12) through the tailings fraction (10) to allow water contained in the tailings and sand to flow by gravity, through the sand channels, to water discharge points (16), and recovering the water (18) from the water discharge points.

A system and method is provided for the remediation of wastewater by electrocoagulation. The system and method are directed to the precipitation of ammonia resulting in the formation of struvite. According to another embodiment, the method also results in precipitation of nitrogen compounds including nitrates, nitrites, and urea.

A system for processing a manure sludge includes in a preferred embodiment: (a) an anaerobic digester; (b) a drying bed planted with a plurality of macrophytes, said macrophytes being nurtured so they are growing and engaging in evapotranspiration bed; and (c) a transfer assembly adapted to deliver a manure sludge from the anaerobic digester to the drying bed so that the roots of the plants contact manure sludge transferred to the drying bed so that the sludge is dried by evapotranspiration. The anaerobic digester and transfer assembly are adapted to: (i) treat raw farm waste slurry to provide a biostabilized manure sludge composition; and (ii) deliver the biostabilized manure sludge composition to the drying bed at a solids content of at least about 1% by weight.

A system for processing a manure sludge includes in a preferred embodiment: (a) an anaerobic digester; (b) a drying bed planted with a plurality of macrophytes, said macrophytes being nurtured so they are growing and engaging in evapotranspiration bed; and (c) a transfer assembly adapted to deliver a manure sludge from the anaerobic digester to the drying bed so that the roots of the plants contact manure sludge transferred to the drying bed so that the sludge is dried by evapotranspiration. The anaerobic digester and transfer assembly are adapted to: (i) treat raw farm waste slurry to provide a biostabilized manure sludge composition; and (ii) deliver the biostabilized manure sludge composition to the drying bed at a solids content of at least about 1% by weight.

A system for urban organic solid waste pyrolysis-gasification coupled with drying includes a sludge feeding and storage device, a pre-drying device, a cyclone separator, a specific cloth bag for sludge and a flue gas waste heat recovery device sequentially connected. The cyclone separator and a sludge outlet of the specific cloth bag for sludge are connected with a cyclone fluidized bed gasification furnace. The cyclone fluidized bed gasification furnace is connected with a high-temperature separator. The high-temperature separator is connected with a secondary combustion chamber. High-temperature flue gas generated by the secondary combustion chamber serves as a heat source of the pre-drying device. Ash generated by the high-temperature separator and secondary combustion chamber is sent to an ash bin after being cooled by a cold slag conveyor. Through system integration and optimization, the disclosure adopts a two-stage process of pre-drying and pyrolysis-gasification, thus having high process controllability and operability.

A system for urban organic solid waste pyrolysis-gasification coupled with drying includes a sludge feeding and storage device, a pre-drying device, a cyclone separator, a specific cloth bag for sludge and a flue gas waste heat recovery device sequentially connected. The cyclone separator and a sludge outlet of the specific cloth bag for sludge are connected with a cyclone fluidized bed gasification furnace. The cyclone fluidized bed gasification furnace is connected with a high-temperature separator. The high-temperature separator is connected with a secondary combustion chamber. High-temperature flue gas generated by the secondary combustion chamber serves as a heat source of the pre-drying device. Ash generated by the high-temperature separator and secondary combustion chamber is sent to an ash bin after being cooled by a cold slag conveyor. Through system integration and optimization, the disclosure adopts a two-stage process of pre-drying and pyrolysis-gasification, thus having high process controllability and operability.

A sludge drying apparatus includes a drying unit for drying sludge as it is transferred by a transfer belt. The drying unit includes a box that covers an upper surface of the transfer belt and extends in a direction of extension of the transfer belt, an air inlet formed at one end of the box, an air outlet formed at the other end of the box, a fan provided outside the box for sucking air in the box from the air outlet and thereby intaking outside air from the air inlet into the box, a dividing portion for dividing the air discharged from the fan into two parts, and a return inlet formed between the air inlet and the air outlet for returning one of the two parts of the air divided by the dividing portion into the box.

A sludge drying apparatus includes a drying unit for drying sludge as it is transferred by a transfer belt. The drying unit includes a box that covers an upper surface of the transfer belt and extends in a direction of extension of the transfer belt, an air inlet formed at one end of the box, an air outlet formed at the other end of the box, a fan provided outside the box for sucking air in the box from the air outlet and thereby intaking outside air from the air inlet into the box, a dividing portion for dividing the air discharged from the fan into two parts, and a return inlet formed between the air inlet and the air outlet for returning one of the two parts of the air divided by the dividing portion into the box.