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A treatment method and technology for heavy metals, which are applied in water/sewage treatment, adsorbed water/sewage treatment, neutralized water/sewage treatment, etc., and can solve the problems of backward heavy metal sewage treatment methods, high cost, and difficulty in reaching discharge standards for sewage.
Inactive Publication Date: 2007-12-19
东莞东运机械制造有限公司
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[0005] For general enterprises, the treatment methods of heavy metal sewage adopted by them are relatively backward, and it is difficult for the trea...
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[0016] See Fig. 1, the heavy metal sewage treatment method that the present invention adopts is as follows:
[0017] Firstly, put the sewage into the PH value adjusting water tank 1 to adjust the PH value of the sewage to neutral; the PH value adjusting water tank 1 adjusts the PH value of the sewage by adding sodium hydroxide and water. The pH of sewage is raised by adding sodium hydroxide and lowered by adding water. Add a pH value test induction device on the water tank 1, and the test induction device controls two valves for controlling the outflow and closing of the sodium hydroxide solution and water. In this way, the automatic adjustment of the pH value of the sewage can be realized.
[0018] After the pH value of the sewage is adjusted to neutral, the sewage is introduced into the reaction tower 2 through a water pump. Fillers are placed in the reaction tower 2 as catalysts to cause oxidation-reduction reactions on sewage. Usually, the catalysts added in the reactio...
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Abstract
The present invention relates to sewage treating technology, and is especially one advanced electrochemical catalytic oxidation process of treating heavy metal containing sewage. During the process, various kinds of stuffing with functions of catalysis, redox, adsorption, flocculating, etc. separately are added. When the sewage passes through the stuffing, heavy metal ions under the action of applied weak current and inflated air are reduced into free metal atoms, which are then separated out from the water through adsorption, neutralization, flocculation, etc. The water is further filtered for reaching the draining standard, and the deposited heavy metal sludge may be recovered and reused.
Description
Technical field: [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method for heavy metal sewage. Background technique: [0002] In many mechanical equipment processing and manufacturing enterprises, such as electroplating, hardware, circuit board production and other enterprises. Many of the production sewage discharged by these enterprises contain a large amount of heavy metals. Heavy metals usually refer to metals with a specific gravity greater than 4 or 5. There are about 45 types, such as copper, lead, zinc, iron, cobalt, nickel, vanadium, niobium, tantalum, Titanium, manganese, cadmium, mercury, tungsten, molybdenum, gold, silver, etc. Although heavy metals such as manganese, copper, and zinc are trace elements needed for life activities, most heavy metals such as mercury, lead, and cadmium are not necessary for life activities, and all heavy metals are toxic to the human body if they exceed a certain concentration....
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