Described is a process of extracting metals from a wet mass which comprises: a step A of concentrating the metals in a carbonaceous solid by means of a thermochemical treatment of the wet mass, with the ancillary production of a treatment gas; a step B of thermochemical decomposition of the carbonaceous solid in an atmosphere constituted by an operating gas which contains oxygen in substoichiometric quantity to carry out the thermochemical decomposition in order to promote a combination of the metals with substances present in the carbonaceous solid to form salts and others solid compounds and to concentrate the latter in residual ashes of the carbonaceous solid at the same time providing for the formation of a combustible synthesis gas comprising hydrocarbons from the carbonaceous solid; a step C of extraction of the metals from the ashes produced.

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.

Exemplary apparatus or method implementations for a universal feeder system configured with a transfer screw feeder within a multi-section clamshell pipe permitting access to the feed screw and pipe interior for inspection, maintenance and/or cleaning during production, without disassembly or screw removal. The clamshell screw feeder pipe provides access to the screw by opening or removing the multi-section top portion of the clamshell pipe. The top pipe section is bolted and or hinges to the bottom portion of the clamshell pipe. The number of segmented multiple clamshell top sections depends on the length of the screw. One or more clamshell top sections may be configured with an inspection port. The universal feeder system configured with a transfer screw feeder within a multi-section clamshell pipe transfers feedstock feed from one or more feed vessels to one or more reactor vessel.

Exemplary apparatus or method implementations for a universal feeder system configured with a transfer screw feeder within a multi-section clamshell pipe permitting access to the feed screw and pipe interior for inspection, maintenance and/or cleaning during production, without disassembly or screw removal. The clamshell screw feeder pipe provides access to the screw by opening or removing the multi-section top portion of the clamshell pipe. The top pipe section is bolted and or hinges to the bottom portion of the clamshell pipe. The number of segmented multiple clamshell top sections depends on the length of the screw. One or more clamshell top sections may be configured with an inspection port. The universal feeder system configured with a transfer screw feeder within a multi-section clamshell pipe transfers feedstock feed from one or more feed vessels to one or more reactor vessel.

The disclosure relates to a treatment method for sludge utilization in a sewage treatment plant, in particular to a method for reducing heavy metal content of sludge-based biocoke. The disclosure includes following steps (1) to (5): step (1): concentrating a residual sludge produced by a municipal sewage treatment plant to be with a moisture content of 95-98%; step (2): conditioning the concentrated sludge in a sludge bioleaching tank for 48 hours, with a pH value of the sludge being reduced to below 4.5; step (3): pumping the conditioned sludge into a high-pressure diaphragm plate and frame for a press filter dewatering to obtain a dewatered cake with a moisture content less than or equal to 50%; step (4): delivering the dewatered cake into a sludge dryer for crushing, heating and drying to obtain the dried sludge with a moisture content of 15-22%; and step (5): carbonizing the dried sludge into sludge-based biocoke at a high temperature in a pyrolytic carbonization device with a carbonization temperature of 500-650.

A method for transforming organic waste into carbon using sequential physical and biological degradation, including fermentation, drying under vacuum and elevated temperature followed by heating to a temperature of between 300° C. and 500° C. to promote carbonization and production of charcoal.

An apparatus and methods to eliminate PFAS from wastewater biosolids through fluidized bed gasification. The gasifier decomposes the PFAS in the biosolids at temperatures of 900-1800° F. Synthesis gas (syngas) exits the gasifier which is coupled to a thermal oxidizer and is combusted at temperatures of 1600-2600° F. This decomposes PFAS in the syngas and creates flue gas. Heat can be recovered from the flue gas by cooling the flue gas to temperatures of 400-1200° F. in a heat exchanger that is coupled with the thermal oxidizer. Cooled flue gas is mixed with hydrated lime, enhancing PFAS decomposition, with the spent lime filtered from the cooled flue gas using a filter system that may incorporate catalyst impregnated filter elements. The apparatus and methods thereby eliminate PFAS from wastewater biosolids and control emissions in the resulting flue gas.

A method for selectively removing micro-contaminants from sludge, the method includes a) providing sludge contaminated with micro-contaminants, and b) subjecting the sludge to a primary treatment step, thereby producing a first stream of primary sludge comprising a first part of micro-contaminants and a second stream of remaining sludge comprising a second part of micro-contaminants, c) subjecting the second stream of remaining sludge to a secondary treatment step, thereby producing biological sludge, wherein the first stream of primary sludge and the biological sludge are further subjected to separate treatment steps whose effects are coupled, so as to divert, capture and destroy the first part of micro-contaminants in the primary treatment step.

A method for selectively removing micro-contaminants from sludge, the method includes a) providing sludge contaminated with micro-contaminants, and b) subjecting the sludge to a primary treatment step, thereby producing a first stream of primary sludge comprising a first part of micro-contaminants and a second stream of remaining sludge comprising a second part of micro-contaminants, c) subjecting the second stream of remaining sludge to a secondary treatment step, thereby producing biological sludge, wherein the first stream of primary sludge and the biological sludge are further subjected to separate treatment steps whose effects are coupled, so as to divert, capture and destroy the first part of micro-contaminants in the primary treatment step.