Introduction
Our textile industry is a major industry that drainage wastewater, the printing and dyeing
wastewater has big COD concentration,large amount of water,strong toxic[1], poor biodegradability,
causing serious pollution of rivers, lakes and the sea.Comprehensive Treatment of printing and
dyeing wastewater has become an urgent problem to be solved . About this study, has achieved
some breakthroughs and progress.
Fenton oxidation acts as an advanced oxidation method with high oxidation efficiency, and it
can degrade recalcitrant pollutants in water[2].Ultrasound technology in recent years has developed a
new water treatment technology. Research shows that water quality of printing and dyeing
wastewater is complex and usually uses a method to handle alone often fail to get good effects,
while using several techniques combined to deal with the wastewater, it can effectively improve the
degradation efficiency.
Now, there are many reports related to complexed printing and dyeing wastewater
treatment[3-4], but the combination of researches on ultrasound / Fenton are still not perfect.This
experiment uses ultrasound and Fenton coupled with ench other to treat priting and dyeing
wastewater to study its effects by orthogonal factors and optimum conditions, in order to provide
reference for engineering applications on priting and dyeing wastewater treatment.

1The experiments
1.1Instruments and Reagents
1.1.1The experimental instrument
DR5000 spectrophotometer, pH meter, condensation reflux device, magnetic stirrer, ultrasonic
reactor, a heating device (furnace), range of different acid buret, conical flask, pipettes, volumetric
flask .
1.1.2 Reagent
H2O2(30%), seven hydrated ferrous sulfate, potassium dichromate, ferroin indicator solution,
ammonium ferrous sulfate, sulfuric acid, sulfuric acid silver, mercury sulfate,printing and dyeing
wastewater.
1.2 Experimental methods
1.2.1 The treatment of printing and dyeing wastewater using Fenton
Put the printing and dyeing wastewater of 50mL into the 250mL beaker, adjusts the pH, adds a
certain amount of FeSO4•7H2O, and then adding a certain amount of hydrogen peroxide, stirs for a
period of time on a magnetic stirrer static, the supernatant was used to measured the COD and
chroma, in order to study the removal efficiency of COD and color effects with Fenton oxidation
method.
1.2.2 The treatment of printing and dyeing wastewater using ultrasonic
Put the printing and dyeing wastewater of 50mL into the 250mL beaker, adjusts the pH, places
the beaker in the ultrasonic reactor, adjusts the reaction time and ultrasonic power, stewing for
some time, to determine the COD and chroma removal, to study the effects of ultrasonic treatment
on the COD and chroma.
1.2.3Treatment of printing and dyeing wastewater with ultrasonic -Fenton:
The 50mL preparation of printing and dyeing wastewater is added to the beaker of 250mL ,
then adjusts pH, and first add a number of quality FeSO4•7H2O, then add a certain amount of
hydrogen peroxide, shock, and put it into the ultrasonic reactor.After ultrasonic is standing, to
determine the COD and chromaticity.In order to get the investigation of ultrasonic-Fenton
combined treatment on removal effect of COD and chroma.
1.3 Methods of analysis
Method of dilution multiple is for color measurement, taking potassium dichromate method is
for COD measurement.

3 Conclusions
The experimental studys on ultrasound and Fenton reagent coupled with each other treatment of
priting and dyeing wastewater, drawing the following conclusions:
(1) Hydrogen peroxide dosage, dosage of FeSO4•7H2O, pH, ultrasonic time, ultrasonic power have
great influence on the treatment effect.
(2) The ultrasound has good effects on the oxidation of Fenton.
(3) At the optimum parameters, ultrasonic -Fenton system on the chroma and COD removal rate
reached 87.5% and 94.6% respectively.