Method for treating wastewater generated from fabricating nitrophenol as well as for reclaiming and using resources
A technology for p-nitrophenol and waste water production, applied in separation methods, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of high investment and operating costs, large adsorption tower equipment, adsorption performance, adsorption capacity, adsorption and desorption. The problems of unsatisfactory speed and service life are attached to achieve the effect of cleaner production resources
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Embodiment 1
[0022] Cool and filter the production waste water with pH about 1-2, p-nitrophenol about 5741 mg / L, total organic carbon 3326 mg / L, and sodium chloride 14%, recover part of p-nitrophenol crystals, and obtain a pH of about 1 ~2. The filtrate of p-nitrophenol 4395mg / L, total organic carbon 2500mg / L, sodium chloride mass concentration 14%.
[0023] Fill 4g of A12 activated carbon fiber (Shenyang Tianyu Purification Material Factory) into a jacketed glass adsorption column (15 × 200mm), and the activated carbon fiber filling volume is 25cm 3 . The filtrate flows through the activated carbon fiber packed bed at a flow rate of 250mL / h at room temperature, the wastewater treatment capacity is 400mL, and the adsorbed water is colorless and transparent, wherein the removal rate of p-nitrophenol is close to 100%, and the total organic carbon is less than 20mg / L.
[0024] The water from the adsorption is adjusted to about pH 7 by adding sodium hydroxide, and sent to the brine refining s...
Embodiment 2
[0027] The adsorbent activated carbon fibers in Example 1 were changed to activated carbon fibers of models such as A10, YT1000, YT1300, YT1600, etc., and other treatment methods were the same as in Example 1. As a result, in addition to the change in the amount of wastewater treated in each batch, other factors such as adsorption effect and desorption rate remained basically unchanged.
Embodiment 3
[0029] With other conditions unchanged in Example 1, the wastewater treatment capacity is 180mL; 25mL of hot water with a concentration of 2% sodium hydroxide and 75mL of hot water are used as desorbents, and the adsorption effect is very good, and the desorption rate is basically maintained. constant.
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