Patent ID: 11932564
Assignee: NORTH CHINA MUNICIPAL ENGINEERING DESIGN & RESEARCH INSTITUTE CO., LTD.
Field: Environmental technology (Chemistry)
Classification: CPC C  Y | IPC C

Claim 8:
9. A method for extracting carbon source from sewage sludge in sewer pipes through online organic and inorganic component separation, using the system for extracting carbon source from sewage sludge in sewer pipes through online organic and inorganic component separation according to claim 1, and comprising the following steps:
a: pumping, by a suction pump of a sewer pipe network sludge cleaning vehicle, sewage sludge in a sewer pipe network into the sludge distribution pipe of the pre-treatment module through a suction pipe and a pressure sludge outlet pipe; distributing, by the rotating scraper under continuous rotation, the sewage sludge discharged from the sludge distribution pipe on the upper surface of the grid plate, such that most of the sewage sludge quickly passes through circular holes of the grid plate due to gravity and enters the conical flow adjustment sludge funnel below the grid plate, while the large particle in the sewage sludge is intercepted on the upper surface of the grid plate; rinsing the large particle through a high-pressure water flow sprayed by a rinsing nozzle of the intermittently running rinsing device;
allowing the rinsed large particle to enter from the oversize residue inlet slot into the pressing tank of the oversize residue pressing module through the vertical channel for dewatering and pressing; and collecting, by a dedicated collection bucket, an oversize residue discharged from the discharge spout as household waste, and transporting the oversize residue to a nearby garbage transfer station;
b: allowing the sewage sludge pre-treated by the pre-treatment module in step a to flow through the first sludge outlet pipe, and enter vertically into the main body of the cyclone separation module through the sludge inlet pipe, along with an agent added by the dosing system; subjecting, by the adjustable stirring paddle under high-speed rotation driven by the variable-frequency stirring motor, the sewage sludge to a hydrocyclone separation with a hydraulic retention time of 1-3 min, such that an organic carbon source in the sewage sludge is separated into a liquid phase, a low-density sludge mixture dominated by an organic component enters the middle-upper part of the cyclone separation module, and an inorganic inert component in the sewage sludge enters the separation funnel under a combined action of a centrifugal force and gravity; and determining whether to operate the dosing system based on an actual phosphate concentration in the sewage sludge and a phosphorus resource utilization need;
c: discharging the sewage sludge treated by the cyclone separation module in step b into a sewage inspection well of a nearby sewer pipe network through the second sludge outlet pipe and a sludge discharge pipe, and locating an outlet of sludge discharge pipe below a water level of the sewage inspection well; and intermittently discharging, according to an actual volume, the inorganic inert component separated in step b into a dedicated collection bucket through the inorganic component discharge pipe under the control of the emptying valve and the discharge valve, and transporting the inorganic inert component to a nearby urban sewage treatment plant for further sand-water separation and precipitation separation of phosphorus-containing chemical sludge; and
d: allowing the malodorous gas emitted during the treatment in steps a and b to naturally enter the deodorization module provided in an upper part of the system; subjecting the malodorous gas to physical adsorption treatment of the filler; and discharging the malodorous gas from the air evacuation device connected to the top center of the cylindrical deodorization module.