Joint dewatering method for kitchen waste and sludge

Abstract

The invention discloses a joint dewatering method for kitchen waste and sludge. The joint dewatering method for the kitchen waste and the sludge is characterized in that firstly, the kitchen waste is crushed to be under 20mm in particle size by using a crushing machine. The method comprises the following concrete steps: A, mixing the kitchen waste with the sludge according to the weight ratio of 1:1 to 1.5:1, and then, adding carbide slag of which the total weight is 5 percent to 10 percent; B, feeding a mixture of the kitchen waste, the sludge and the carbide slag prepared by the method into a stirring machine and stirring for 10 minutes, and evenly mixing; and C, feeding the stirred material to a spiral extrusion dewaterer for extrusion, and performing extrusion dewatering under the pressure of 18kg / cm<2> to obtain a mixture of which the water content is lower than 55 percent, wherein the content of sodium chloride (salt) contained in the kitchen waste is greater than or equal to 0.1 percent of the total weight of the kitchen waste. According to the joint dewatering method for the kitchen waste and the sludge disclosed by the invention, a so-called viscose phase area in the sludge is broken by utilizing the salt content in the kitchen waste, and a modifier is replaced, so that the cost is saved. The odor can be rapidly removed by adding the carbide slag. Moreover, by taking the kitchen waste, the sludge and the carbide slag as to-be-treated objects, various wastes can be treated at a time.

Description

technical field [0001] The invention belongs to the field of solid waste disposal, and in particular relates to a method for combined dehydration of kitchen waste and sludge, which removes water from the food waste and sludge and facilitates subsequent treatment of the two solid wastes. Background technique [0002] The construction of urban sewage treatment plants in my country has begun to take shape, but the development of sludge treatment and disposal is relatively slow. At present, many sewage treatment plants in my country only carry out simple concentration and dehydration of sludge and then transport it abroad. The sludge treatment is not in place. It greatly affects the final disposal of sludge. Even if the sludge is concentrated and dehydrated in the sewage treatment plant, it often fails to meet the requirements, and the moisture content of the sludge is still high. This treatment not only increases the difficulty of transportation, but also poses a threat to the s...

AI Technical Summary

Problems solved by technology

[0002] The construction of urban sewage treatment plants in my country has begun to take shape, but the development of sludge treatment and disposal is relatively slow. At present, many sewage treatment plants in my country only carry out simple concentration and dehydration of sludge and then transport it abroad. The sludge treatment is not in place. greatly affects the final disposal of sludge

Even if the sludge is concentrated and dehydrated in the sewage treatment plant, it often fails to meet the requirements, and the moisture content of the sludge is still high. This treatment not only increases the difficulty of transportation, but also poses a threat to the surrounding environment of the transportation route, which is even more serious The most important thing is to bring great inconvenience to the subsequent sludge disposal

Under normal circumstances, the water content of sludge can be reduced from above 98% to 75% to 86% after being pressed by a filter press. However, continuing to reduce the water content through mechanical pressing not only consumes a lot of energy, but also has no obvious volume reduction effect. related to the characteristics of the sludge itself