Method for treating waste water containing high-concentration nitrate ions
A nitrate ion, high-concentration technology, applied in the field of water treatment, can solve the problems of high treatment cost, high energy consumption, and danger of instruments and equipment by the concentration separation method, and achieves the effects of low cost, simple process, and not easy to be dangerous.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0022] 200 g of the catalyst was added to 1 liter of 85 g / L (14 g / L as N) sodium nitrate solution, and concentrated hydrochloric acid was added thereto to keep the pH of the solution at 3 or lower. Use a stirrer to disperse the catalyst in the solution, and then slowly pass hydrogen gas into the aqueous solution through several pipes leading to the bottom of the container, with a total flow rate of 20 ml / min, for a total of 6 hours of reaction. After analyzing the solution, the concentration of nitrate ions remaining in the solution was obtained. The results are shown in Table 1, and compared with the situation without catalyst.
[0023]
[0024] Table 1
[0025] Can draw according to the result of table 1, when not adding catalyzer, sodium nitrate is difficult to decompose, and after passing into hydrogen in the aqueous solution, activated the catalytic effect of the gac powder that is loaded with metallic palladium, promoted the reduction reaction of nitrate, Residual so...
Embodiment 2
[0027] 200 g of the catalyst was added to 1 liter of 0.85 g / L (0.14 g / L as N) sodium nitrate solution, and concentrated hydrochloric acid was added thereto to keep the pH of the solution at 3 or lower. Use a stirrer to disperse the catalyst in the solution, then slowly pass hydrogen gas into the aqueous solution through several pipes leading to the bottom of the container, with a total flow rate of 2 ml / min, and react for 1 hour in total. Obtain the nitrate ion concentration remaining in the solution after analyzing the solution, the results are shown in Table 2, and compared with the situation without catalyst.
[0028]
[0029] Table 2
[0030] Can draw according to the result of table 2, when not adding catalyst, sodium nitrate is difficult to decompose, and after passing into hydrogen in the aqueous solution, activated the catalytic effect of the gac powder that is loaded with metallic palladium, only need a small amount to promote lower Concentration of nitrate reduct...
Embodiment 3
[0032] 200 g of catalyst was added to 1 liter of 85 g / L (14 g / L as N) of sodium nitrate solution, and concentrated hydrochloric acid was added thereto to keep the pH of the solution at 3 or lower. A stirrer was used to disperse the catalyst in the solution, and then hydrogen gas was slowly introduced into the aqueous solution through several conduits leading to the bottom of the container with a total flow rate of 2 ml / min for a total of 6 hours of reaction. Obtain the nitrate ion concentration remaining in the solution after solution analysis, the results are shown in Table 3, and the hydrogen flow rate is 5 milliliters / minute, 10 milliliters / minute, 15 milliliters / minute, 25 milliliters / minute and the situation of no flow of hydrogen Compare.
[0033]
[0034] table 3
[0035] According to the results of Table 3, it can be concluded that the greater the hydrogen flow rate, the more complete the reduction reaction of nitrate radicals. When the flow rate reaches a certain ...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More