摘要
采用序批式反应器(SBR)进行猪场废水厌氧消化液好氧后处理,研究后处理过程中亚硝化/硝化调控因素.在厌氧消化液中配入原水比例10%—30%(V/V)的试验中,配水比例越低,反应体系pH值越低,出水氨氮浓度越高,亚硝化率也越高.在曝气量100L/h—260L/h的条件下,曝气量越大,出水氨氮浓度越低,亚硝化率也越低.一个运行周期的监测数据反映出:曝气结束时氨氮浓度和溶解氧是影响硝化进程的主要因素.只要将曝气控制在氨氮刚好氧化完全时停止,即使大的曝气量也能达到高的亚硝化率(87%以上),用硝化过程动力学常数能很好解释这种现象.在进水氨氮浓度524—937mg/L范围内,进水氨氮浓度越高,出水氨氮浓度越高,但是亚硝化率平均值都在75%左右,说明进水NH_3-N浓度对亚硝化率没有影响.试验结果表明:通过调控出水氨氮浓度和溶解氧可以将硝化进程控制在亚硝化阶段.
A sequencing batch reactor （SBR） was used to post-treat digested swine wastewater, in order to investigate the factors controlling nitrite build-up. In the experiment of addition ratio of raw wastewater to digested effluent ranging from 10% to 30% （V/V）, the pH value, concentration of ammonia nitrogen in effluent and ratio of nitrite dropped along with the addition ratio of raw wastewater reducing. Under the condition of SBR treatment system with aeration quantity from 100L/h to 260L/h, The higher was the aeration quantity, obviously, the higher was dissolved oxygen, as a result, the lower was the concentration of ammonia nitrogen in effluent and the ratio of nitrite. Main parameters during a cycle in SBR indicated concentration of ammonia nitrogen and dissolved oxygen （DO） at the end of aeration were the predominant control factors. As long as aeration was halt at the end of oxidation of ammonia nitrogen, a higher ratio of nitrite （more than 87% ） can be achieved even though SBR with larger aeration quantity. The phenomena can be well explained by the kinetic constants of nitrifying process. In the rang of concentration of ammonia nitrogen in influent from 524mg/L to 937mg/L, The concentration of ammonia nitrogen in effluent raised along with increased ammonia nitrogen in influent. However, No significant difference in ratio of nitrite （about 75% ） for different concentration of ammonia nitrogen in influent was observed, suggesting that the concentration of ammonia nitrogen has no influence ratio of nitrite. The experiment results showed that nitrite build-up in nitrification process can be realized by controlling concentration of ammonia nitrogen in effluent and dissolved oxygen （DO） in SBR.
出处
《应用基础与工程科学学报》
EI
CSCD
2008年第5期639-646,共8页
Journal of Basic Science and Engineering
基金
农业部现代农业产业技术体系国家生猪现代产业技术体系
关键词
硝化
反硝化
溶解氧
氨氮
亚硝化率
nitrification
denitrification
dissolved oxygen
ammonia nitrogen
ratio of nitrite
