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Study on Treatment of Mixed Printing and Dyeing Wastewater and Rapid Determination of Cadmium

Author: LiuSongYang
Tutor: ZhouMingDa
School: Central South University
Course: Analytical Chemistry
Keywords: mixed printing and dyeing wastewater coagulationsedimentation method micro-electrolysis Fenton oxidation anodicstripping voltammetry
CLC: X791
Type: Master's thesis
Year: 2013
Downloads: 18
Quote: 0
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Abstract


In this paper, coagulation-micro-electrolysis-Fenton oxidation process routes was put forward according to characteristics of the mixed printing and dyeing wastewater and the actual situation of a printing and dyeing company in Zhejiang Province. Small experiment were studied to explore the optimum technological parameters. Water quality after the handling of the entire process could reach "Discharge standards of water pollutants for dyeing and finishing of textile industry"(GB4287-2012) emission standard.Coagulation sedimentation method was applied for pretreatment of mixed printing and dyeing wastewater, using industrial sulfuric acid to adjust pH value. Polyferic iron was the best inorganic flocculant. The optimum condition was:pH value of8, polyferic iron dosage of1.5g/L, rapid mixing intensity of140r/s, the time for2min. Removal rate of COD and chroma were60%and80%. The effluent pH was about6. COD was between600and750mg/L. Chroma was about100.Micro-electrolysis technology was the further process for wastewater treatment. The optimum reaction conditions were:influent pH value of3, residence time of2h, auto-adding waste acid to make the effluent pH of4, aerating to make the dissolved oxygen of about4mg/L, auto-adding lime adjusting pH to7～8. The volume ration of filler and wastewater was2:3. Effluent COD was between300and400mg/L with removal rate of55%. Effluent chroma could reach the new standard.For effluent wastewater cannot reach the standard after using micro-electrolysis method, so the connection and coupling of micro-electrolysis and Fenton oxidation were tried and the optimum operating parameters were determined. The optimum condition of connection method was:using the effluent wastewater of micro-electrolysis for Fenton oxidation, H2O2dosage of3ml/L, reaction time of60min. The effluent COD was around110mg/L with removal rate of84%. The optimum condition of coupling method was: influent pH of3.5, H2O2dosage of5ml/L, reaction time of120min. The effluent COD was about90mg/L with removal rate of88%.Cadnium in water could be detected by anodic stripping voltammetry. Under the condition of scan range from-850mV to-50mV, scan rate500mV/s, accumulation time100s, a good linear relationship between peak current and concentration of Cadnium ranged from0.0040mg/L to0.1200mg/L. As3+, Ni2+, Pb2+and Cu2+four common ions had no effect on the determination alone. Although mixed ions had small effect, it was neglected in the rapid determination. Detection limit of method was0.0010mg/L. The recovery rate of samples was between93.0%and110.2%. RSD of7parallel samples was under10%. The relative deviation was within20%compared with graphite furnace atomic absorption spectrophotometry. So it was applicable in the field of environmental monitoring rapid determination.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Light industrial waste disposal and comprehensive utilization > Textile, printing and dyeing industry
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