Leaching device for processing heavy metal in house refuse and sludge by using citric acid

Abstract

The invention provides a leaching device for processing heavy metal in house refuse and sludge by using citric acid, comprising a pedestal (4), a leacheate collecting tank (7), and a frame (8), wherein the periphery of the frame is provided with straight form support rotating rods (3), the axial two end portions of the straight form support rotating rods support a transmission chain, a crawler type filter screen conveyer belt (2) is fixed on the chain, a stainless steel sludge reserve tank (1) is fixed above the crawler type filter screen conveyer belt, an atomization spray system (6) is arranged above the stainless steel sludge reserve tank, and a set of filter screen cleaning devices (13) are arranged below the crawler type filter screen conveyer belt and above the leacheate collecting tank. The leaching device disclosed herein can continuously work, has large handling capacity, convenient maintenance, and low maintenance cost. The leaching device adopts bilayer rollers to drive and has no damage to the crawler type filter screen conveyer belt, thus multi-protection is realized, and the service life of the crawler type filter screen conveyer belt is prolonged.

Description

technical field [0001] The invention relates to a leaching device for treating heavy metals in municipal domestic garbage, in particular to a leaching device for treating heavy metals in domestic garbage sludge by using citric acid. Background technique [0002] At present, with the rapid development of the economy and the continuous improvement of living standards, municipal solid waste is increasing at a rate of 8%. Urban household garbage includes household garbage, public places and street cleaning garbage, commercial household garbage, etc. Its main components are kitchen waste, waste paper, waste plastic, waste fabric, waste glass, vegetation, dust, etc. These domestic wastes not only cause a great waste of resources, but also cause environmental pollution, such as soil pollution, air pollution, and domestic water pollution. [0003] The methods of dealing with domestic waste mainly include landfill, incineration and composting. [0004] The landfill method is to bur...

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Problems solved by technology

[0011] Gao Yanzheng of Huazhong Agricultural University and other experiments on the desorption of cadmium in soil by organic acids and its influencing factors also found that adding citric acid can activate cadmium and trace elements in soil, increase the solubility of cadmium in soil solution, and because it forms with cadmium The stability of the organic complex is lower than that of Cd-EDTA, and it is easy to decompose in soil solution

[0012] However, there is no corresponding washing equipment in the prior art. Since the washing equipment is directly related to the effect of compost washing, it is necessary to develop an efficient and cheap washing equipment.

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