氧化沟/水生植物滤床组合工艺处理蓝藻厌氧沼液

Oxidation Ditch and Aquatic Plant Filter Bed for Treatment of Biogas Slurry from Anaerobic Digestion of Blue-green Algae

根据蓝藻厌氧沼液含有高浓度有机物的特点,采用氧化沟与水生植物滤床组合工艺对其进行处理。研究发现:氧化沟与水生植物滤床之间有较强的互助和互补性,能够有效处理蓝藻厌氧发酵沼液,系统出水平均COD<50 mg/L、氨氮<1.6 mg/L、TN<6 mg/L、TP<0.5 mg/L,达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准。气相色谱—质谱联用仪分析表明,氧化沟对沼液中难降解有机物有良好的去除效果;水生植物滤床的植物吸收、微生物降解及过滤是其净化水质的主要原因;氧化沟与水生植物滤床耦合系统中的微生物能有效降解沼液中的藻毒素,使其含量<1μg/L。

Based on the high concentration of organic matter in biogas slurry from anaerobic digestion of blue-green algae, a combined process of oxidation ditch and aquatic plant filter bed was used to treat the biogas slurry. The study found a high complementarity between the oxidation ditch and aquatic plant filter bed, which improved the treatment effect of the biogas slurry. The average concentrations of COD, NH3 -N, TN and TP in the effluent were 〈50 rag/L, 〈 1.6 mg/L, 〈6 mg/L and 〈0.5 mg/L, respectively, meeting the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB 18918 -2002）. Gas chromatographymass spectrometry （GC- MS） analysis showed that the oxidation ditch was efficient in refractory organics removal, and the aquatic plant filter bed performed water purification through plant uptake, microbial degradation and filtration. Microorganisms in the coupled system could effectively degrade mierocystins to 〈 1 μg/L in the biogas slurry.