Method for eliminating nitrite in drinking water by utilizing enzyme residues
A technology of nitrite and enzyme residue, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as reducing treatment costs, achieve control of use costs, realize resource utilization, and wide-ranging sources. Effect
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Embodiment 1
[0022] (1) Take 1 part by mass of the enzyme residue of Xinhuikan pulp, that is, sample 1, and its source is detailed in patent CN201910056640.7, the same below;
[0023] (2) Take 40 parts by volume of drinking water containing nitrite concentration of 5 μg / mL (prepared by dissolving sodium nitrite in distilled water, the same below), put it in the container, then add the above sample 1, mix it evenly, and put it in the container. Reaction at 37°C for 24 hours;
[0024] (3) Using the improved GB5009.33-2016 method, the residual nitrite content in the solution was determined to be 68.18 μg, that is, the removal rate was 65.91%.
[0025] The characteristics of this process are: the enzyme residue is directly applied to remove nitrite in drinking water, does not require fine processing, is simple and practical, has obvious effect, low cost, and is easy to popularize and apply.
Embodiment 2
[0027] (1) Take 1 part by mass of the fermented citrus pulp enzyme residue, put it in a soaking container, add 10 mL of 80% ethanol, and soak for 24 hours. Transfer the extract to a vacuum rotary concentrator, heat it in a water bath at 45°C under a vacuum of 70kpa to remove the ethanol solvent, and obtain the evaporated concentrate after soaking in ethanol, namely sample 2;
[0028] (2) Take 2 parts by volume of drinking water containing nitrite concentration of 5 μg / mL, put it in a container, then add the above sample 2, mix well, and react at a temperature of 30°C for 1 hour;
[0029] (3) Using the improved GB5009.33-2016 method, the residual sodium nitrite content in the solution was determined to be 0.17 μg, that is, the removal rate was 98.31%.
[0030] The characteristics of this process are: the concentration of active substances in the enzyme residue extract is higher, and the concentration of active substances can be adjusted according to the needs to improve product...
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