Sludge recycling technique

A technology of recycling and sludge, applied in dewatering/drying/concentrating sludge treatment, petroleum industry, special forms of dry distillation, etc. The effect of energy consumption, solving incomplete disposal and reducing disposal cost

Inactive Publication Date: 2012-05-02
福建省科辉环保工程有限公司
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Problems solved by technology

At present, about 80% of the sludge in my country has not been stabilized. Due to the transfer of pollutants such as odorous substances, pathogens, and persistent organic matter in the sludge from the sewage to the land, the pollutants are further diffused, and the large-scale buildings that have been built and put into operation The environmental emission reduction benefits of sewage treatment facilities are greatly reduced

Method used

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Embodiment Construction

[0032] see figure 1 , and with figure 2 , figure 2 It is a preferred embodiment of the present invention, which can treat 50 tons of urban sewage plant sludge per day.

[0033] In the first step, the sludge is transported to the screw propulsion air dryer through the screw pump for low temperature direct heating drying. The drying temperature of the spiral propulsion airflow dryer is about 300 ℃, and the sludge drying process at this temperature will not produce dioxins; the heat source required for the spiral propulsion airflow dryer is mainly the waste heat of the dry distillation machine, and the auxiliary heat source is The residual heat of the flue gas in the auxiliary combustion chamber; the moisture content of the sludge after being dried by the spiral propulsion airflow dryer can be reduced from 80% to about 40%.

[0034] Among them, the sludge dryer is a spiral propulsion airflow dryer, such as image 3 As shown, it is composed of a housing 3, a blade 2, a rotat...

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Abstract

The invention discloses a sludge recycling technique which comprises the following steps: sending sludge to a drying machine to carry out low-temperature drying; separating sludge and fume from the drying machine by a gas-solid separator; sending the separated dry sludge to a dry distillation machine to carry out dry distillation; carrying out deficient-oxygen or no-oxygen dry distillation while keeping the temperature of the dry distillation furnace at 150-800 DEG C, wherein organic substances in the sludge are subjected to cracking reaction in the dry distillation process to produce abundant high-heat-value combustible gas which can be used as a fuel, and the fume generated by the dry distillation furnace is discharged after being subjected to waste heat utilization and purification; and after the dry distillation finishes, cooling the residual solid slag to below 50 DEG C by a slag cooling machine, thereby obtaining biological carbon. By using sludge drying+dry distillation technology, the sludge is prepared into the biological carbon for soil amendment, thereby thoroughly solving the problem that the sludge is hard to treat; and the invention does not need subsequent treatment or produce secondary pollution, has the advantage of low treatment cost, and can thoroughly change waste sludge into valuable substances, thereby implementing recycling and cyclic utilization.

Description

technical field [0001] The invention relates to a novel sludge resource disposal process, which belongs to environmental protection engineering technology. Background technique [0002] Sludge from urban sewage plants is a product of sewage treatment, and it is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids, etc. Due to the high moisture content of sludge (up to 99%), high organic matter content, easy to rot and smell, and the particles are finer, the specific gravity is smaller, and it is in a colloidal liquid state, which is a thick liquid between liquid and solid. material, so it is difficult to completely dispose of it. At present, the domestic and foreign sludge disposal processes mainly include: drying, composting, farmland utilization and land utilization, incineration, landfill and other comprehensive utilization (brick making, ceramsite making, etc.). Among them, composting has a long disposal cyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C10B53/00
CPCY02P20/129
Inventor 陈良泽黄靖华杨平
Owner 福建省科辉环保工程有限公司
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