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.

An apparatus, method and system is provided for treating sewage sludge by dewatering the sewage sludge, heating the sewage sludge being treated to destroy pathogens, and then reducing volatile solids in the sewage sludge being treated through biochemical decomposition to produce a treated biosolids product that meets government regulations for pathogen reduction and vector attraction reduction.

The present invention relates to separation methods and systems for converting high concentrations of animal wastes into useful products, wherein the separation of the desired useful products is conducted with a cross-flow filtration system having the ability to the separate desired useful energy and/or products from both viscous and non-viscous medium.

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.

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.

What is provided is a metal ion recovery device including: a raw solution tank that is configured to store a metal ion containing raw solution including metal ions; a recovery liquid tank that is configured to store a metal ion recovery liquid including metal ions recovered from the metal ion containing raw solution; a metal ion selective permeable membrane that separates the raw solution tank and the recovery liquid tank and selectively transmits the metal ions; an anode that is arranged on a side of the metal ion selective permeable membrane close to the raw solution tank; a cathode that is arranged on a side of the metal ion selective permeable membrane close to the recovery liquid tank; a porous current collector that is formed of a conductive material; a first spacer that is configured to maintain a gap between the metal ion selective permeable membrane and the anode; and a second spacer that is configured to maintain a gap between the metal ion selective permeable membrane and the cathode, in which the anode is arranged to be electrically connected to the metal ion selective permeable membrane through the porous current collector, and the cathode is arranged to be electrically connected to the metal ion selective permeable membrane through the porous current collector, and two or more of at least one of the raw solution tank and the recovery liquid tank are provided.

A drying system includes a disk contact dryer, which includes an inlet for the sewage sludge, a drying chamber for temporarily accommodating the sewage sludge, multiple disks in the drying chamber, a drive for rotating the disks at a defined rotational speed, a heater for heating the disks, an outlet for the sewage sludge dried in the drying chamber, and an incineration system for the dried sludge. The drying system includes an input sensor for determining the initial moisture of the sewage sludge, an output sensor for determining the final moisture of the sewage sludge, and a controller for regulating the rotational speed of the disks and/or the heat output of the heater and/or the amount of sewage sludge entering the inlet, and/or the amount of dry sewage sludge exiting the outlet based on the measurements of the input sensor and of the output sensor.

A drying system includes a disk contact dryer, which includes an inlet for the sewage sludge, a drying chamber for temporarily accommodating the sewage sludge, multiple disks in the drying chamber, a drive for rotating the disks at a defined rotational speed, a heater for heating the disks, an outlet for the sewage sludge dried in the drying chamber, and an incineration system for the dried sludge. The drying system includes an input sensor for determining the initial moisture of the sewage sludge, an output sensor for determining the final moisture of the sewage sludge, and a controller for regulating the rotational speed of the disks and/or the heat output of the heater and/or the amount of sewage sludge entering the inlet, and/or the amount of dry sewage sludge exiting the outlet based on the measurements of the input sensor and of the output sensor.

This specification describes systems and methods for treating wastewater, for example digestate. The wastewater is separated into a liquid fraction and a solid fraction. The solid fraction of the wastewater is composted. The liquid fraction of the wastewater can be treated, which may result in further by-products. Optionally, at least some of the liquid fraction may be reused in the process. The by-products produced in treating the liquid fraction and/or additional organic solid waste, for example green waste, brought into the treatment facility can be added to the compost. The compost breaks down through aerobic and/or anaerobic digestion processes. Thermophilic conditions may develop in composting piles and increase the rate of evaporation of excess water. When sufficiently dry, the compost may be used as a fertilizer or soil enhancement product.

This disclosure provides apparatuses and methods for a rotatable, cylindrical basket within a housing, wherein the rotatable, cylindrical basket has a longitudinal bore therethrough and an external surface, and, optionally, other surface areas, comprising filtering media. Further, the housing may include an inlet and an outlet, wherein the inlet and the outlet, optionally openable and closeable, and located at least proximate to opposing ends of the rotatable, cylindrical basket. Further still, the apparatus may include a heating unit removably coupled to the rotatable, cylindrical basket, wherein the heating unit is configured to blow hot air onto at least a portion of the filtering media.