A crystalline hydrated mineral containing amino and hydroxyl groups and its application method in cadmium-containing wastewater treatment
An application method and amino-containing technology, applied in the field of wastewater treatment, can solve problems such as unsatisfactory treatment effect, slow precipitation speed, and high concentration of cadmium ions in the effluent
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Embodiment 1
[0028] Prepare 3L of ammonium chloride solution of 2g / L (N meter), according to n (NH 4 Cl):n(MgCl 2 ):n(Na 2 HPO 4 )=2:1:1 molar ratio Weigh quantitative magnesium chloride and disodium hydrogen phosphate solid, then prepare 1mol / L NaOH solution. Under the condition of keeping stirring, magnesium chloride and disodium hydrogen phosphate solid were added to the prepared ammonium chloride solution, according to the ratio v(NaOH):v(NH 4 Cl)=0.0325:1, measure 97.5 mL of NaOH solution, and quickly put the measured NaOH solution into the system after adding magnesium chloride and disodium hydrogen phosphate. The stirring speed was adjusted to 500r / min, and the stirring time was controlled to 30min. After solid-liquid separation, the precipitate was taken out and dried, and the drying temperature was controlled at 50°C. After drying for 2 hours, the amino group (-NH 3 ) and hydroxyl (-OH) crystalline hydrated minerals.
Embodiment 2
[0030] Measure the amino group (-NH) synthesized in embodiment 1 3 ) and hydroxyl (-OH) crystalline hydrated minerals have 6 crystal water molecules, and the average mineral density is 1.8g / cm 3 , the nitrogen content is 5.71%, the hydrogen content is 6.5%, and the oxygen content is 65.3%. After 30 minutes of reaction, the average particle size of the crystalline hydrated mineral is 30.2 μm, and the zeta potential is -2.6mV. The infrared spectrum of the mineral surface shows that Contains the indicated amino group (-NH 3 ), hydroxyl (-OH) peaks ( figure 1 ).
Embodiment 3
[0032] Take 1L of cadmium-containing wastewater with a cadmium concentration of 100mg / L, and add caustic soda to the wastewater under stirring to increase the pH of the system to 8.0, so that cadmium ions undergo hydrolysis reaction, and the hydrolysis reaction time is 1min. Then, the crystalline hydrated mineral containing amino and hydroxyl groups obtained in Example 1 was added to the solid-liquid mixed system after the hydrolysis reaction, and the mass ratio of the dosage to the cadmium in the waste water was 2.5:1. Then mix and stir for 20min. The obtained solid-liquid system was subjected to solid-liquid separation, and the cadmium content in the supernatant was measured to be 0.07 mg / L, which had reached the "Pollutant Discharge Standard for Urban Sewage Treatment Plants" (GB18918-2002). The precipitation was detected by a particle size analyzer, and the average particle size reached 29.6 μm. As a comparison, the wastewater sample was treated by the traditional alkali-...
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