ABSTRACT
Objective: To investigate the removal effect of 5 kinds of common flocculants on 6 kinds of toxic alkaloids in processing wastewater of Aconiti Radix. Method: HPLC was employed to determine contents of 6 kinds of alkaloids in the processing wastewater of Aconiti Radix before and after flocculation.The mobile phase consisted of acetonitrile-tetrahydrofuran(25:15)-0.1 mol·L-1 ammonium acetate solution(each 1 L contains 0.5 mL of glacial acetic acid) for gradient elution, volume flow rate was 1.0 mL·min-1, detection wavelength was 235 nm.The removal characteristics and effects of five common flocculants of ferric chloride, aluminum sulfate, polymeric ferric sulfate, polyaluminum chloride/polyacrylamide(PAC/PAM) and sodium polyacrylate were compared and preliminarily optimized. Result: The 5 kinds of flocculants had certain selectivity for different types of alkaloids, and the removal of 6 kinds of alkaloids showed obvious differences.Among them, the PAC/PAM attenuated relative superiority, when the pH 6, adding amount of 0.25 g·L-1 and PAC-PAM dosing ratio of 30:1, comprehensive removal effect was relatively good, removal rates of mesaconitine and hypaconitine was 85.4%and 58.3%, respectively. Conclusion: The flocculation method can be used as a pretreatment process to reduce the toxicity of processing wastewater of Aconiti Radix.
ABSTRACT
A strain,WJ-100, with high flocculating activity was screened from activated sludge.Its optimum pH was 6.5 and optimum temperature was 25℃～40℃.Its shaking speed was in the range of 80～240 r/min. Na~ + ,K~ + ,Ca~ 2 + and Fe~ 3+ could accelerate flocculation .Ca~ 2+ did the most obviously.WJ-100 can use various saccharides as good sources of carbon,the flocculating rate reached 99.2%,99.8%,even 100%.The strain could flocculate very well when pH of Kaolin clay suspension was 2.0～10.0.WJ-100 had high flocculation efficiency in the conditions of relatively large pH value, temperature, sources of carbon, shaking speed, mixing speed etc.and showed fine resaerch and application importance.