A double-layer spiral electrochemical device for removing and recovering heavy metals in sludge

Abstract

The invention provides a double-helix device for recovering heavy metals from sludge by adopting an electrochemical removal method. The device comprises a helix-type electrochemical reactor, a cathode electrode, an anode electrode and an ion exchange membrane, wherein the helix-type electrochemical reactor is composed of an outer cylinder, a middle helix cylinder, an inner helix cylinder, a circular lower base plate, a helix-type opening upper base plate and a bracket; the area encircled by the inner helix cylinder and the circular lower base plate forms an anode chamber; the anode chamber is communicated with the area formed by the outer cylinder and the middle helix cylinder; the area formed by the upper layer inner helix cylinder, the middle helix cylinder and the helix-type opening upper base plate is a cathode chamber; the ion exchange membrane is adhered on the outer surfaces of the inner helix cylinder and the middle helix cylinder through a glass cement; a resource recovery pipe of the cathode chamber of the electrochemical reactor is positioned on the end plate of the cathode chamber; a feed pipe and a discharge pipe are symmetrically positioned on the outer side of the outer cylinder and are further connected with a booster pump. The double-helix device for recovering heavy metals from sludge by adopting the electrochemical removal method has the advantages of being good in economical efficiency, simple, and convenient and fast, high in processing efficiency and capable of separating and recycling heavy metals from sludge and the like.

Description

technical field [0001] The invention relates to the technical field of waste treatment and resource utilization, in particular to a double-helix electrochemical device for removing and recovering heavy metals in sludge. Background technique [0002] The data show that the Zn content in the sludge produced by my country's urban sewage treatment plants can reach 783.4-3096.3mg / kg (dry weight), Cu can reach 131.2-394.5mg / kg (dry weight), in addition, it also contains some other heavy metals, such as Cd, Cr, Hg, Ni, Pb, etc. The existence of these heavy metals not only seriously affects the subsequent safe disposal of sludge, but also causes a great waste of metal resources. Taking Zn as an example, according to the 2010 urban sludge output of 30 million tons (80% water content), the Zn content is calculated as 1500mg / kg (dry weight), and the Zn content in it reaches 9000 tons. According to the Shanghai Futures Exchange Zn The recent quotation is 15,000 yuan / ton, and the economi...

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Problems solved by technology

Due to the advantages of simple operation, stable operation, and not easy to cause secondary pollution, the electrochemical method has attracted much attention. However, traditional electrochemical treatment devices either place the waste between the cathode and anode stages, and add Electrolyte, the current efficiency cannot be fully utilized; or the waste is placed on the anode, but the contact between the electrode and the sludge is not sufficient, resulting in low electrolysis efficiency

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