Unlock instant, AI-driven research and patent intelligence for your innovation.

Sludge treatment method

A sludge treatment and mud cake technology, applied in the field of sludge treatment in urban sewage plants, can solve the problems of long production cycle, odorous gas discharge, and ocean pollution, and achieve the effects of protecting soil, increasing production, and shortening post-processing time.

Inactive Publication Date: 2009-11-11
杨培根
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology and equipment of the incineration method are complicated, energy consumption is high, the investment is high, and it is accompanied by air pollution problems; the landfill method is limited by land use; the sea throwing method will pollute the ocean and pose a threat to the marine ecosystem and human food chain. International Convention It has been expressly prohibited; the composting method occupies a large area, the production cycle is long, the exposure time in the air is long, the emission of odor gas is serious, and a large amount of CO is emitted into the atmosphere at the same time 2 、CH 4 and other greenhouse gases and H 2 S, methyl mercaptan and other gases seriously pollute the environment, the final product has low nutritional content, and the relative proportion of heavy metals and harmful germ toxins is high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A. Pyrolysis process:

[0022] 4 tons of pretreated mud cakes are injected into the pretreatment tank through the mud pump, and then 0.5 tons of straw are added, sent into the pretreatment tank through a conveyor, industrial sulfuric acid is added, and the pH value of the mud is adjusted to 3.05, and then Add 1 kg of nano-scale iron trichloride, and after mixing and stirring, add it to the hydrolyzed material storage tank. After the feeding is completed, close the inlet and outlet valves, open the inlet valve, and make the pressure reach 1.1Mpa, and the temperature is 150°C (about It takes half an hour), keep the pressure for 2 hours, and stop stirring 30-45 minutes before discharging. After the pressure keeping is over, open the drain valve to let the clarified liquid produced by pyrolysis be discharged directly. After the draining is completed, the steam drain valve can be opened. The water in the tank at a temperature as high as 150 °C will quickly drop to below 100 ...

Embodiment 2

[0032] A. Pyrolysis process:

[0033] 4 tons of pretreated mud cakes are poured into the pretreatment tank through the mud pump, and then 0.8 tons of straw are added, sent into the pretreatment tank through a conveyor, industrial sulfuric acid is added, and the pH value of the mud is adjusted to 4.15. Add 2 kg of nano-scale ferric trichloride, after mixing and stirring, add it to the hydrolyzed material storage tank. After the feeding is completed, close the inlet and outlet valves, open the inlet valve, and make the pressure reach 1.25Mpa, and the temperature is 190°C (about It takes half an hour), keep the pressure for 3 hours, stop stirring 30-45 minutes before discharging, and after the pressure keeping is over, open the drain valve to let the clarified liquid produced in the pyrolysis process be discharged directly. After the liquid discharge is completed, the vent valve can be opened, and the water in the tank, which is as high as 190°C, will quickly drop to below 100°C ...

Embodiment 3

[0043] A. Pyrolysis process:

[0044] 4 tons of pretreated mud cakes are injected into the pretreatment tank through the mud pump, and then 1 ton of straw is added, sent into the pretreatment tank through a conveyor, industrial sulfuric acid is added, and the pH value of the mud is adjusted to 4.85, and then Add 5 kg of nano-level aluminum trichloride, and after mixing and stirring, add it to the hydrolyzed material storage tank. After the feeding is completed, close the inlet and outlet valves, open the inlet valve, and make the pressure reach 1.25Mpa, and the temperature is 220°C (about It takes half an hour), keep the pressure for 4 hours, stop stirring 30-45 minutes before discharging, and after the pressure keeping is over, open the drain valve to let the clarified liquid produced in the pyrolysis process be discharged directly. After the liquid discharge is completed, the vent valve can be opened, and the water in the tank, which is as high as 190°C, will quickly drop to...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The sludge treating process includes pre-treatment and post-treatment, and the post-treatment includes a pyrolysis step, a spraying and aerating step, a dewatering step, an ammonia fixing step and a fertilizer producing step. The pyrolysis step includes regulating the pH value of sludge cake to 3-5 with industrial sulfuric acid, adding organic stuffing and catalyst, maintaining at 1.1-1.5 MPa pressure and 190-220 deg.c temperature for 2-4 hr, and cooling to room temperature, with the weight proportion among the sludge cake, the organic stuffing and the catalyst being 4 to 0.5-1 to 0.001-0.005. Compared with available technology, the present invention has the advantages of short post-treatment period and capacity of producing granular organic-inorganic composite fertilizer.

Description

Technical field: [0001] The invention belongs to the technical field of sludge treatment methods, in particular to the technical field of urban sewage plant sludge treatment methods. Background technique: [0002] The sewage treatment process of modern urban sewage treatment plants is divided into two parts: sewage treatment and sludge treatment, and sludge treatment is divided into pre-treatment and post-treatment. The water content is 75-80%, and the aftertreatment methods include incineration, landfill, throwing into the sea and composting. The technology and equipment of the incineration method are complicated, energy consumption is high, the investment is high, and it is accompanied by air pollution problems; the landfill method is limited by land use; the sea throwing method will pollute the ocean and pose a threat to the marine ecosystem and human food chain. International Convention It has been expressly prohibited; the composting method occupies a large area, the p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/10C02F11/12C05F7/00
CPCY02A40/20
Inventor 杨培根程张红陆际文姬亮昝向明荀小牛
Owner 杨培根