Water purification composition and process
A technology of composition and compound, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as arsenic content not meeting the strict standards of safe drinking water, poor aesthetics, difficulties, etc.
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Embodiment 1、3-5、7、8 and comparative example A-D
[0065] The LDH compounds of Examples 1, 3-5, 7, 8 were prepared as follows:
[0066] Nitrates of divalent metal ions and nitrates of trivalent metal ions in the molar ratios shown in Table 1 were mixed and dissolved in water, and the solution was heated to a temperature of 90 to 95°C. In a separate vessel, a sodium carbonate solution was prepared and heated to a temperature of 90 to 95°C. The brine solution and carbonate solution were added to a third vessel with simultaneous vigorous stirring. During the addition, the temperature of the solution was maintained at a temperature of 90 to 95°C. During this reaction LDH compounds are formed and precipitate out of solution. After the precipitation was complete, the slurry was stirred at the same temperature for about 1 hour. The precipitate was then washed to be substantially free of dissolved salts, vacuum filtered, and dried to a moisture content of less than 10%.
[0067] The purification process was carried out as follows:...
Embodiment 9-12 and comparative example E-I
[0075] Using the more preferred LDH compounds of the present invention, experiments were performed using water with a higher degree of contamination, ie, water with 10,000 ppb arsenic. A procedure similar to that of Examples 1-8 was used. The data are summarized in Table 2:
[0076] Table 2
[0077]
[0078] The data in Table 2 demonstrate that water highly contaminated with arsenic can be purified using the method employing the preferred LDH compounds of the present invention. The adsorption capacity is significantly better than materials used in the prior art.
Embodiment 13
[0079] Example 13 and Comparative Examples J-L: Performance of a combination of LDH compound and flocculating composition (Example 13) and a composition outside the scope of the present invention (Comparative Examples J-L).
[0080] The purification process was performed as follows: 10 liters of test water with 300 ppb arsenic were placed in a bucket. The As(III) compound used is NaAsO 2 and the As(V) compound used is Na 2 HASO 4 .H 2 O. Add the composition shown in Table 3 and stir for 1 minute. Let the mixture sit for 5 minutes. The water is then filtered through the cloth. The arsenic content of the filtered water was measured and the results are summarized in Table 3.
[0081] table 3
[0082]
[0083] The data in Table 3 demonstrate that arsenic-contaminated water can be purified using a composition comprising an LDH compound of the present invention in combination with a flocculation system. This combination provides synergistic benefits over the individual c...
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