反硝化颗粒污泥处理电镀废水中硝态氮的中试研究  

Pilot-scale study on treatment of nitrate nitrogen in electroplating wastewater by denitrifying granular sludge

作　　者：王佩超 秦远乐 余华东 刘俊涛 麻峰崚 许海亮 WANG Peichao;QIN Yuanle;YU Huadong;LIU Juntao;MA Fengling;XU Hailiang(Zhejiang Hi-tech Environmental Technology Co.,Ltd.,Hangzhou 310000,China)

机构地区：[1]浙江海拓环境技术有限公司,杭州310000

出　　处：《工业用水与废水》2024年第4期25-30,共6页Industrial Water & Wastewater

基　　金：浙江省“尖兵”“翎雁”研发攻关计划(2023C03147)。

摘　　要：采用絮状污泥培育的反硝化颗粒污泥处理实际电镀废水中的硝态氮,通过逐步提升反硝化负荷,培养反硝化颗粒污泥,以评估该污泥的脱氮效果及其性状变化,进而探索其在电镀废水脱氮处理中的实际应用潜力。试验结果显示,在进水COD的质量浓度为400~520 mg/L,NO_(3)^(-)-N的质量浓度为50~100 mg/L,NO2--N的质量浓度为0.2~2.3 mg/L,pH值为6.5~7.2,反应器溶解氧的质量浓度小于0.2 mg/L,上升流速为2~6 m/h的条件下,当脱氮负荷提升至3.4 kg[NO_(3)^(-)-N]/(m^(3)·d)时,硝态氮的去除率高达95%以上,且Δρ(COD)/Δρ(NO_(3)^(-)-N)平均值仅为3.85∶1。系统稳定运行时间长达30 d,处理后出水中NO_(3)^(-)-N的质量浓度低于5 mg/L。此外,处理电镀废水后,反硝化颗粒污泥中的钙、铜、镍、铁含量均有显著上升。同时,成熟的颗粒污泥的VSS/SS值明显降低,颗粒污泥的粒径主要集中在1.0~2.8 mm范围内。反硝化颗粒污泥在处理电镀废水时展现出脱氮负荷高、出水NO_(3)^(-)-N浓度低、Δρ(COD)/Δρ(NO_(3)^(-)-N)低以及脱氮效果稳定等特点,可显著提高处理电镀废水NO_(3)^(-)-N的效率。Denitrifying granular sludge cultivated by flocculent sludge was used to treat nitrate nitrogen in actual electroplating wastewater,through gradually increasing denitrifying load and cultivating denitrifying granular sludge,the denitrification effect and the property changes of the denitrifying granular sludge were evaluated,and then,the practical application potential of the said sludge in the denitrification treatment of electroplating wastewater was explored.The experimental results showed that,under the condition that the mass concentrations of COD,NO_(3)^(-)-N and NO_(2)^(-)-N were 400~520,50~100 and 0.2~2.3 mg/L respectively,the pH value was 6.5~7.2,the mass concentration of dissolved oxygen in the reactor was lower than 0.2 mg/L,and the ascending velocity was 2~6 m/h,when the nitrogen removal load was increased to 3.4 kg[NO_(3)^(-)-N]/(m^(3)·d),the removal rate of nitrate nitrogen was higher than 95%,and the average value ofΔρ(COD)/Δρ(NO_(3)^(-)-N)was only 3.85:1.The stable operation time of the system was up to 30 days,and the nitrate nitrogen concentration in the treated water was less than 5 mg/L.In addition,the contents of Ca,Cu,Ni and Fe in the denitrifying granular sludge increased significantly after the treatment of electroplating wastewater.At the same time,the VSS/SS value of the mature granular sludge was significantly reduced,and the particle size of granular sludge mainly concentrated in the range of 1.0~2.8 mm.Denitrifying granular sludge shows characteristics of high denitrifying load,low nitrate nitrogen concentration,lowΔρ(COD)/Δρ(NO_(3)^(-)-N)value and stable denitrification effect in treatment of electroplating wastewater,which can significantly improve the efficiency of NO_(3)^(-)-N removal from electroplating wastewater.

关 键 词：反硝化 颗粒污泥 电镀废水 NO_(3)^(-)-N 上升流速 脱氮负荷 

分 类 号：X703.1[环境科学与工程—环境工程]