Aim\ Treating the wastewater produced from the extracting technology of pectin by the salting-out method. Methods\ Using Al(Ⅲ) in pectin wastewater and polyacrylamide ( PAM ) as coagulant

milk of lime as sedimentation aid

cinder and activated carbon for joint decolourisation. Results\ Through orthogonal experiment to determine the best technical condition

the wastewater after treatment is colourless and transparent. The reduced percentage of Al(Ⅲ) reaches 99.3%

of SO\+\{2-\}\-4 90.5%

of COD\-\{Cr\} 87.0% and pH value 7.0

all these reach the standard of reusable water. Conclusion\ The treatment cost of this technology is quite low

so that it is convenient to use and easy to be popularized in enterprises in villages and towns.