Municipal sludge treatment method

Abstract

The invention discloses a municipal sludge treatment method. The municipal sludge treatment method comprises the following steps: 1) adding sulfide or / and elemental sulfur into the municipal sludge, cultivating at 10 to 35 DEG C for 2 to 4 days and performing filter pressing to obtain filtrate and a filter cake; 2) adding the filter cake into a carbonization furnace, performing carbonization and activation at 480 to 520 DEG C for 5 to 10 hours, pulverizing and sieving to obtain activated carbon particles, and introducing waste gas generated by the carbonization furnace into the filtrate; and 3) adding a sewage treating agent into the filtrate, mixing completely and uniformly, performing filter pressing, directly discharging clean liquid and intensively embedding mud cake. The municipal sludge treatment method provided by the invention is low in treatment cost and good in treatment effect, the water content of the finally obtained mud cakes is low, microorganisms such as pathogen in thesludge are killed completely, and the heavy metal ions in the sludge are completely transformed into stable compounds and are not liable to dissolve out.

Description

technical field [0001] The invention relates to a municipal sludge treatment method. Background technique [0002] Over the past few decades of reform and opening up, my country's economy has developed rapidly, the level of urbanization has continued to deepen, the urban area has become larger and larger, and the discharge and treatment rate of domestic sewage have continued to increase. As of 2015, the total number of urban sewage treatment plants in my country has exceeded 3,000, with a total design treatment capacity of more than 200 million cubic meters. A large amount of municipal sludge will be produced in the process of sewage treatment. Calculated with a water content of 80%, the annual output of sludge in my country has exceeded 30 million tons, and it is increasing year by year. It is estimated that by 2020, it will exceed 60 million tons. Problems are becoming increasingly prominent. [0003] Municipal sludge contains a large amount of organic pollutants, inorgan...

AI Technical Summary

Problems solved by technology

At present, municipal sludge is generally concentrated, filtered and dewatered to reduce the water content to 80%, and then transported out for disposal or simply stacked. Cause secondary pollution to water resources and land resources, and seriously affect the surrounding environment

In addition, disposal methods such as sanitary landfill, burning or composting land have obvious disadvantages

Sanitary landfill needs to reduce the water content of municipal sludge to less than 60%, the cost of drying municipal sludge is high, the energy consumption is high, and pollutants such as heavy metal ions in municipal sludge are also likely to cause secondary pollution; sludge incineration It is required to reduce the moisture content of the sludge to less than 50%, which consumes a lot of energy, and the waste gas generated by incineration needs to be additionally treated, resulting in high treatment costs; although the use of composting land can reuse the sludge, the heavy metals in the sludge Toxic and harmful substances such as ions and pathogens can easily cause secondary pollution