多级A/O及改进工艺去除煤气化废水中典型污染物

Removal of Typical Pollutants from Coal Gasification Wastewater by Multi-Stage A/O and Modified Process

采用多级A/O工艺(MsAO)和生物膜强化多级A/O工艺(BEMsAO)对煤气化废水进行处理,研究其对煤气化废水中典型污染物的去除特征。结果表明,当进水COD为546.9~2 221 mg/L时,MsAO和BEMsAO对COD均有较好的去除效果,去除率分别为91.67%和89.03%,去除负荷分别为514.9 g/(m^3·d)和364.6 g/(m^3·d);进水NH4^+-N的质量浓度为195.4~520.3 mg/L时,MsAO出水的NH_4^+-N的质量浓度平均为149.4 mg/L,去除率为63.42%。BEMsAO出水的NH_4^+-N的质量浓度平均为1.32 mg/L,去除率为99.48%,BEMsAO对NH_4^+-N的去除效果优于MsAO,NH_4^+-N的平均去除率提高了36.06%。当水力负荷由0.08 m3/(m^2·d)逐步升高到0.11 m^3/(m^2·d)时,MsAO中NH_4^+-N的去除率显著降低;尽管水力负荷增加了37.5%,但BEMsAO中NH_4^+-N的去除率始终维持在99.00%以上,BEMsAO耐负荷冲击能力优于MsAO。

Multi-stage AgO process （MsAO） and biofilm enhanced multi-stage AgO process （BEMsAO） was used to treat coal gasification wastewater, and the removal characteristics of typical pollutants were researched. The results showed that when the COD ofinfluent was 546.9-2 221 mg/L, MsAO and BEMsAO present good performance of COD removal, the removal rate was 91.67% and 89.03% respectively, and the removal of volume load was 514.9 g/（m3· d） and 364.6 g/（m3· d）, respectively. When the mass concentration of NH4＋-N of influent reached 195.4-520.3 mg/L, the NH4＋-N removal rate by BEMsAO was better than MsAO, the removal rate was 99.48% and 63.42% respectively which was enhanced about 36.06%, and the average mass concentration of NH4＋-N of effluent was 1.32 mg/L and 149.39 mg/L, respectively. When the hydraulic loading rate increased from 0.08 m3/（m2· d） to 0.11 m3/（m2·d）, the NH4＋-N removal rate by MsAO decreased significantly, although the hydraulic loading rate increased 37.5%, the NFL＋-N removal rate by BEMsAO always remained above 99.00%. The resistance to load impact of BEMsAO process is clearly better than MsAO process.