水性工业涂料废液的处理研究

The Treatment of Waste water of Waterborne Industrial Coatings

采用混凝-生物接触氧化-芬顿高级氧化组合工艺对水性涂料废液进行处理研究。重点考察了该工艺对涂料废液COD、氨氮和SS的去除效果。结果表明,pH升高对涂料废液中的SS、COD有去除效果并且能够避免混凝时发生板结,当pH为10时,COD由148000 mg/L降至46000 mg/L,SS质量浓度由18500 mg/L降至2500 mg/L,去除率分别达到86.4%和68.5%;接触氧化反应器经过60 d的运行,COD容积负荷达到0.67 kg/(m^3·d),出水COD、氨氮去除率分别达到94%、85%;经过混凝-生物接触氧化-芬顿高级氧化组合工艺处理最终出水COD为280 mg/L左右.氨氮质量浓度为15 mg/L,SS质量浓度为13 mg/L左右,均可达到排放标准。

The coagulation-biological contact oxidation-Fenton advanced oxidation combination process was used to study the treatment of coatings production wastewater.The effect of this process on the removal of COD,ammonia nitrogen and SS(suspended solid)in coatings wastewater was investigated.It was found that the increased pH value showed a positive effect for removing SS and COD in the coatings wastewater and could avoid the occurrence of compaction when coagulation.When the pH value reached 10,the optimal removal rate of SS and COD was 86.4%and 68.5%,respectively and the COD droped to 46000 mg/L,SS reduced to 2500 mg/L;after 60 d of operation of the contact oxidation reactor,the COD volume load reached 0.67 kg COD/(m3·d),and the effluent COD and ammonia nitrogen removal rates reached 94%and 85%respectively.After coagulation-The biological contact oxidation-Fenton advanced oxidation combined process treatment,the final effluent COD concentration was about 280 mg/L,ammonia nitrogen concentration 15 mg/L,and SS concentration about 13 mg/L, meeting the discharge standard.