Sludge treating method and apparatus

Abstract

The invention provides a sludge treating method. The sludge treating method comprises the following steps: subjecting sludge to full pyrohydrolysis, wherein pyrohydrolysis temperature is in a range of 180 to 190 DEG C, such a temperature range corresponds to saturated vapor pressure of 1.0 to 1.25 MPa, and pyrohydrolysis time is 20 to 60 min; carrying out rapid wet oxidation on a material having undergone pyrohydrolysis, wherein oxidation temperature is 130 to 170 DEG C, oxygen partial pressure is 0.5 to 1.0 MPa and oxidation time is 3 to 10 min; and subjecting the material having undergone rapid wet oxidation to solid-liquid separation so as to obtain a fertilizer for garden greening or matrix for soil improvement. The sludge treating method exerts substantial effect on reduction in water content of sludge; after solid-liquid separation, a separated liquid is clear, and the removal rate of heavy metals is high; and the method has the advantages of energy conservation, high efficiency, low usage requirements on equipment and low construction and operation cost.

Description

technical field [0001] The invention relates to a sludge treatment method and device, belonging to the technical field of sludge treatment. Background technique [0002] my country has a huge population. With the development of further urbanization and industrialization, the water consumption of urban residents and industrial production is increasing, and the discharge of sewage is also increasing. Activated sludge method is an existing and commonly used sewage treatment method. [0003] The activated sludge method will produce a large amount of by-products, namely sludge, which is perishable, has a strong odor, and contains a large number of pathogenic bacteria, viruses, parasites and various heavy metals that are extremely harmful to the human body. Entering nature will extremely seriously damage the natural ecology and environment, and pose a serious threat to human health and even life. [0004] There are three main methods of traditional sludge harmless and stabilizati...

AI Technical Summary

Problems solved by technology

The temperature of the sludge hydrolysis reaction in this method and device is low and the time is short. Some organic components in the sludge, such as fats, sugars, fibers, and flocculant polyacrylamide, cannot meet the hydrolysis conditions at all. It cannot be completely hydrolyzed, the high temperature oxidation treatment temperature reaches 200°C~260°C, and the pressure is 2.6MPa~4.8MPa. After the oxidation temperature is higher than 200°C, although the solubility of oxygen increases significantly, the energy consumption level and the requirements for equipment are also doubled, and the pressure It has reached the medium pressure standard, and has higher requirements for the design and manufacture of reaction vessels, higher operating costs and more difficult management

Images