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One question: We use well water at home; the well is 30 meters deep, but there are dyeing factories in the vicinity； I want to use ferric sulfate polymer, but I’m not sure if it will work to remove iron and manganese, as well as heavy metal ions, from groundwater
No, iron and manganese need to be oxidized first before they can be removed through filtration; coagulation alone is not sufficient to remove them； Heavy metals cannot be removed merely through coagulation.
It is recommended that you send the water sample to the local quality inspection authorities for testing before consulting relevant seafood experts. The tests should include 1) heavy metals, 2) COD, and 3) pH level. Be sure to pay close attention to your health
No, heavy metal ions cannot be removed by coagulation; membrane filtration or adsorbent materials with a high affinity for heavy metals can be used instead.
Suggestion: After the water is extracted, find a way to expose it to air so that manganese is oxidized to manganese dioxide and iron is oxidized to ferric oxide; thereafter, coagulants such as alum can be added to settle these substances. As for other heavy metal ions, it’s hard to say anything definite about them – small amounts of them can still cause significant harm; it is recommended to use ion exchange resins
It should be possible. I’ve seen it in one company; the process involves sufficient contact with air, apparently through aeration towers, followed by filtration using manganese sand. If many companies use groundwater for their water needs, they can carry out this preliminary treatment. Sometimes, after the well water is pumped up and left for a while, flocculent precipitates form; these are mostly precipitates of iron and manganese
The manganese sand contact aeration oxidation method is generally used to remove iron and manganese from groundwater! ! !
No, heavy metals cannot be removed using the method suggested by the original poster; for safety reasons, it’s better to find another source of water
Removing iron and manganese from water is the simplest process; a manganese sand filter is sufficient for this purpose. An aeration device is installed at the front of the filter, primarily to oxidize ferrous and manganese ions, and the cost involved is not high. What LZ needs to consider is the contamination by other organic substances. Since printing and dyeing wastewater contains a large amount of dyes, and these are mostly organic dyes with very poor biodegradability, there is a high likelihood that this will lead to deterioration in water quality.
Floors 9 and 10 refer to the processes that are currently used most frequently and that are also feasible from an economic perspective; I just don’t know what the actual results are, as I haven’t seen them with my own eyes. However, the other methods are indeed difficult to implement and not economically viable.