| How to effectively govern the chemical high concentration waste water is related to the healthy development of the national economy. Pollution status, harmless and common processing method was introduced briefly in this paper for insurance powder and pesticide waste water.The relevant type of waste water treatment work was carried out including the optimization of waste water treatment process parameters and Fenton oxidation- ion exchange combined processing technology research.The specific job is as following:The insurance powder is treated by coagulation sedimentation technology compared with the two common flocculant Through investigation of experiment, the optimal coagulation parameters are pH = 9, stirring in 0.1% polyaluminium chloride with mixing speed is 100 r/min which time is 1 minute; then stirring in 0.1%polyacrylamide which time is 5 minutes, then left stewing for 2 h. After treating,COD removal rate can reach 48.9%. The waste water is treated by H2O2 Fenton process after coagulation pretreatment, affecting mechanisms and affecting rules of each influence factors are summarized. The results show that the optimum parameters of the Fenton for waste water is pH =3, adding Fe2+500 mg/L, adding H2O2 10 g/L,reaction time is 3 h, COD removal rate can reach 62.6%. Experiments also investigated the electricity- Fenton oxidation process after Fenton pretreatment.Results show that the current density of 0.3 A/cm2, hybrid additive concentration of 5g/L, reaction time is 6 h, COD removal rate can reach 92.5%.Fenton semeai worm pairs- ion exchange joint technology was also carried out to study the treatment of pesticide waste water comprehensively. The method of orthogonal experiment was adopted to determine conditions of the joint processing preliminarily. Besides, main influence factors in the single factor experiments were optimized. The result suggested that COD removal rate reached 52.3% when waste water was adjusted to pH=3 by sulfuric acid, dosing quantity of Fe2+ and H2O2 were600 mg/L and 12 g/L, respectively, and reaction time was 3h. The static and dynamic method were studied to exam the removal rate of Cl- in waste water. It was found that the optimum conditions of dynamic adsorption were pH=6, 7 ml/min of velocity, four adsorption column in series and 5g of total amount of resin, which adsorption rate was43%; The optimum conditions of static adsorption were pH=4, 10 g of resin dosage and 90 min of adsorption time, which adsorption rate can be up to 40%.Finally, the method of solvent extraction was carried out to treat the solid residue of anthraquinones dye. The result showed that: when waste water was dissolved with acetone firstly, filter the residue, and then use 5% of the sodium carbonate solution for extraction in the temperature of 50 ?, extraction times for 3 times and extraction time for 10 min, stirring speed of 300 rpm, the extraction rate is highest with 56.7%. |
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