三相生物流化床处理低C/N污水的亚硝化过程控制研究
doi: 10.13205/j.hjgc.201501015
TREATMENT OF WASTEWATER FROM NON-POINT SOURCE IN RURAL AREAS WITH HIGH-RATE ALGAL POND( HRAP)
-
摘要: 将短程硝化与生物流化床相结合,采用低碳氮比的人工合成污水进行启动,考察进水COD、氨氮、DO、p H对硝化和亚硝化过程的影响。研究表明,较短的水力停留时间(HRT)和较少的接种污泥量有利于生物膜的生长,能够成功实现生物流化床的快速启动。高进水氨氮浓度有助于反应器实现亚硝酸盐的积累,但是这种积累并不稳定。当反应器中p H为7.5~8.1,ρ(DO)为1.5~2.5 mg/L时,最大亚硝化率达到75%左右,氨氮去除率达85%以上。出水NO-2-N和NO-3-N浓度随进水COD浓度的增加而减少;当进水COD浓度为50 mg/L时,出水硝酸盐浓度急剧减少,亚硝酸盐浓度有所降低,反应器发生同步硝化反硝化脱氮现象。Abstract: Currently,the annual emission load of rural domestic sewage is increasing steadily in China,while the treatment of them is not optimistic that in 96% of the villages drainage and sewage treatment systems hadn t been built,bringing about severe environmental contamination in rural areas. To research the rural non-point source domestic sewage,a pilot apparatus for high rate algal pond ( HrAP) was used to treat the artificial rural non-point source domestic sewage and the optimum operational conditions,impact factors and reaction mechanism were systematically investigated during the process. Based on the optimal culture medium for the algae,the optimum conditions for nitrogen and phosphorus were given: the maximum removal rate of NH + 4 - N,TP and COD exceeded 95%,60% and 90% respectively in the HrAP under the optimal operational conditions of full aeration,temperature of 24 ~ 35 ℃,light intensity of 4 000 Lux,pH 7. 5 and algae concentration of 8 × 105 /mL.
-
Key words:
- rural non-point source wastewater /
- high-rate algal pond ( HrAP) /
- NH+ 4 -N /
点击查看大图
计量
- 文章访问数: 210
- HTML全文浏览量: 21
- PDF下载量: 107
- 被引次数: 0