Research For Removal And Control Technology Of Taste And Odor Compounds In Drinking Water Based On Sulfate Radical

With the development of industry,a large amount of pollution was discharged into rivers and lakes which lead tocaused serious water pollution and eutrophication.of the drinking water sources and eutrophication.What is more,Eutrophication eutrophication may leads to algal blooms,eutrophicationthe growth process not only would damage the water environment,but alsoand release a lot of taste and odor compounds.2-Methylisoborneol（2-MIB）is one of the common taste and odor compunds.Nowadys,some triditional oxidation methods can hardly degrade some micro-organic Advanced moreover,the advanced oxidation technology as an efficient new type of water treatment technology had be widely concerned.has been widespread concern,for the conventional oxidation methods hard to degrade some micro-organic matter.This study used automation headspace solid phase micro extraction-gas chromatographymass spectrometry to synchronously detect five T&O compounds.The method exhibited high sensitivity with the detection limit lowered as 1.5 ng/L,and high linearity（regression coefficients R2 > 0.98）when the concentrations ranged within 1 to 1000 ng/L.This method was reliable to analyze the T&O compounds in samples with complex background.Experiments show that ferrous ion activated persulfate（PS）can play a very good effect of 2-MIB degradation at room temperature.The effect of ferrous ion concentration,PS concentration,molar ratio of Fe²⁺ to PS,the humic acid concentration and PH value were studied in this experiment.The results showed that,there are two processes in the reaction: a quick stage in the first 5 minutes and a slow reaction stage after 5 minutes.The slow reaction stage can conform firstorder kinetics model.Fe²⁺: PS = 1: 1 is the most cost-effective way for the 2-MIB degradation in the Fe²⁺/ PS system,the degradation rate can reach 86.27%.When the citric acid and ammonium persulfate proportion is 1: 4,the maximum degradation rate will be reached as high as 96.48%.The degradation rate from high to low is acidic,neutral and alkaline condition.In this experiment PHYTO-PAM and GC-MS was used to detect the changes of the preudanabaena sp.and its activity,chlorophyll and 2-MIB.In the Fe²⁺/PS system the preudanabaena sp.die within 5min.Due to cell rupture,chlorophyll concentration andextracellular 2-MIB increased when Fe²⁺/PS concentration were 0.5m M and 1m M.Later the chlorophyll and extracellular 2-MIB will be gradually degraded.While higher concentration of Fe²⁺/PS（5m M）will not cause a increase in chlorophyll concentration and extracellular 2-MIB.When using the Fe²⁺and PS to deal with the actual water samples which containing 2-MIB,the best concentration is 0.5m M for degradation and coagulation: the degradation rate of 2-MIB could reach 89.68%,the turbidity decreased to 0.5NTUand the TOC content is also decreased by 39%.