Treatment Of Pharmaceutical Wastewater Byiron Carbon Micro Electrolysis + Fentonoxidation Process

As the main component of industrial wastewater,pharmaceutical wastewater not only forms a large amount each year,but its composition is also particularly complex and difficult to treat.Generally,the direct use of traditional biochemical treatment methods often fails to achieve good treatment effects.In this case,pretreatment operations are required before the biochemical treatment stage.The wastewater produced by a pharmaceutical factory in Weifang has high organic content and low biodegradability,and the biochemical treatment effect is not ideal.This paper analyzes the advantages and disadvantages of the existing pretreatment methods in detail.Taking the pharmaceutical wastewater as the research object,a pretreatment combination plan is drawn up,and the influencing factors of each reaction stage in the pretreatment plan are studied in detail,mainly discussing iron and carbon.The best combination of micro-electrolysis technology,Fenton oxidation technology,and the best combination of Fenton oxidation stage in the pretreatment of pharmaceutical wastewater by the combined process,and the water quality of the single pretreatment method and the combined process after pretreatment of the wastewater are compared.（1）Using scrap iron filings and particulate carbon as raw materials for the micro-electrolysis reaction,single-factor experiments and orthogonal experiments were used to study the pretreatment effects of wastewater from pharmaceutical factories.The results show that the order of the influence of various factors on the effect of iron-carbon micro-electrolysis treatment is iron-carbon mass ratio>reaction time>aeration volume>p H value;single factor experiment and orthogonal experiment determine the best parameters of micro-electrolysis reaction It is:p H value=3,iron-carbon mass ratio=2:3,aeration rate of 4L/min,and reaction time of 120min.After running under this combined condition,the CODcr of the effluent after the reaction was determined to be 4095mg/L,the removal rate of CODcr was about 55%,and the biodegradability was increased from 0.16 to 0.28.（2）The results of Fenton oxidation show that:the primary and secondary order of the influence of each factor on the effect of Fenton oxidation treatment is H₂O₂dosage>Fe SO₄dosage>p H value>reaction time;the best combination parameters determined by single factor experiment and orthogonal experiment are:p H value=2,the dosage of H₂O₂is 10ml/L,the dosage of Fe SO₄is 1000 mg/L,and the reaction time is 100min.After running under the combined conditions,the CODcr concentration of the effluent after the reaction was determined to be 4659.2mg/L,the removal rate of wastewater CODcr was about 48%,and the biodegradability was increased from 0.17 to 0.29.（3）Due to the certain changes in the water quality after the iron-carbon micro-electrolysis,the optimal combination of various factors in the Fenton section needs to be re-discussed.This paper explores the pretreatment of pharmaceutical wastewater by the combined process of iron-carbon micro-electrolysis+Fenton.The pharmaceutical wastewater is pretreated with the optimal iron-carbon micro-electrolysis operating parameters that have been discussed,and the effluent is taken for Fenton oxidation experiment.The optimal combination parameters are determined through experiments:the dosage of H₂O₂is 6ml/L,the reaction time is80min,and the p H is 3.0.Under the combined conditions,the wastewater was treated by a combined process,and the results showed that the removal rate of CODcr was83.8%,and the biodegradability was increased from 0.15 to 0.43,and the biodegradability was greatly improved.（4）The pilot test results show that the discussed iron-carbon micro-electrolysis-Fenton reaction parameters can better treat the pharmaceutical wastewater,and its CODcr average removal rate is 85.3%,with a good stability.After treatment,the biodegradability is increased to 0.45 and it can smoothly enter the biochemical section for deepening treatment.（5）The process transformation of the sewage treatment station of the pharmaceutical factory,the addition of a joint pretreatment unit,and the continuous operation for 30 days after the completion of debugging The results show that the pretreatment unit has a removal rate of 55.2%for this type of pharmaceutical wastewater,and the removal effect is significant.The B/C value is increased from0.16 to 0.35 when the water enters.The biodegradability is significantly improved,which creates a relatively high level for wastewater entering the biochemical unit.Good hydraulic conditions.It is worth noting that the filler in the iron-carbon micro-electrolysis tower should be resurrected regularly during the operation.The final effluent CODcr of the wastewater after being treated by the biochemical unit is115mg/L,which meets the requirements of the emission standard.The cost of wastewater treatment is estimated,and the direct operating cost of a comprehensive ton of water is about 8.5 yuan.The parameter combination of each treatment stage discussed in this study can provide a certain reference for the selection of iron-carbon micro-electrolysis-Fenton oxidation combined process for pretreatment of this type of pharmaceutical wastewater in practical applications in the future.