Method and device for producing drinking water through deep purifying by DMI and activated carbon composite bed

Abstract

The invention provides a method and a device for producing drinking water through deep purifying by a DMI and activated carbon composite bed, and belongs to water treatment methods and devices. The method comprises the following steps: sterilizing and disinfecting; removing arsenic; removing heavy metal; and absorbing with activated carbon to remove organic substances, bacteria, virus left in water, and residual heavy metal and free chlorine, thus obtaining the drinking water which comprehensively meets the standard, and is pure and clean, healthy and tasty. The device comprises a raw water pump, an activated carbon absorbing separating device, etc. With the adoption of the method and the device, the efficiency of removing heavy metal such as iron, manganese and arsenic is high, and the removing rate is more than 99.8%; the heavy metal index of the drained water is below 0.01 ppm, which is beyond the current international standard of drinking water; no wastewater is drained, except the backwashing wastewater; and the backwashing is intermittently carried out at fixed period, and the backwashing wastewater accounts for 2% of the total water inlet quantity. Therefore, the water production rate is high; and the water resource can be saved.

Description

technical field [0001] The invention belongs to a water treatment method and a device, in particular to a method and a device for deep purification of a DMI and activated carbon composite bed to produce drinking water. Background technique [0002] According to data released by the Ministry of Water Resources in 2016, 70% of my country's groundwater and surface water are polluted to varying degrees, and the types of pollutants vary in different regions. The main pollutants are excessive heavy metals, excessive chemical substances, excessive fluorine, etc., as well as excessive iron in pipe network pollution, which seriously threatens people's life and health, especially excessive heavy metals, which are the main cause of cancer. Iron, manganese, and arsenic are indispensable trace elements for the human body. However, excessive iron and manganese entering the human body will seriously endanger human health. According to relevant reports and "China Environmental Protection E...

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Problems solved by technology

In view of the excessive treatment methods such as iron, manganese and arsenic, the manganese sand filtration treatment process was introduced from Japan 20 years ago to assist in increasing oxygen and aeration to remove heavy metals such as iron, manganese and arsenic; but manganese sand has a disadvantage, it can only remove Iron and manganese have a certain effect, but are ineffective against other heavy metals. In addition, manganese sand must be cultivated by bacterial film for 3 to 6 months, and some as long as one year, before it can remove part of iron and manganese. Cycle plant, only the effluent in the cultivation period is unqualified, and it is still used by residents

For the removal of heavy metals such as iron, manganese and arsenic, due to the rapid development of membrane technology in recent years, some people use reverse osmosis membranes or nanofiltration membranes for treatment, but due to high treatment costs and high equipment maintenance costs, it is difficult for most waterworks Promotion, and the use of reverse osmosis membrane or nanofiltration membrane, the water produced is basically pure water, does not contain other nutrients needed by the human body, does not belong to healthy drinking water, long-term drinking is not beneficial to the human body

Moreover, the water production rate of the membrane filtration process is about 70%, and the water resources cannot be fully utilized, resulting in waste of water resources

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