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It was studied that the optimum adsorption conditions of Cr(VI) in wastewater by high efficient na-bentonite. The optimum adsorption conditions for Cr(VI) in wastewater were that the pH value was 3~5, the dosing quantity of high efficient na-bentonite was 40 g/L and the mixing time was 30 minutes. The removal rate of Cr (VI) was up to 95% under aforesaid conditions.
The best experimental factors were achieved through the single factor experiment and orthogonal experiment. When the initial concentration of formaldehyde was 120mg/L, reaction time was 30 minutes and the ratio between amount of sodium bisulfite and formaldehyde was 3:1, the removal rate of formaldehyde was approximately up to 100%, which fully satisfied the national emission standards (the concentration...
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