若采用A/O污水处理工艺来处理城市污水,A/O处理工艺将前段缺氧段和后

若采用A/O污水处理工艺来处理城市污水,A/O处理工艺将前段缺氧段和后段的好氧段连在一起。异氧细菌在充足缺氧段将存在污水中的污染物和这些可溶性中的有机物游离水解为有机酸,使这些不溶性中的有机物经过分解而成为具有可溶性的其他有机物,大量小分子中的有机物经过分解后再转化而成为其他小分子中的有机物,当这些经充足缺氧段游离水解的有机产物直接进入水中好氧池,在水中进行好氧回流处理时,可大大提高其对氧的吸收效率以及污水的生态可生化性;在充足缺氧段利用异氧细菌将水中蛋白质、脂肪等悬浮污染物污水进行游离氨化,即存在有机链上的氮活者氨基酸中的氨基会游离释放出氨和铵根离子(NH3、NH4+),在充足的供氧条件下,自养菌的硝化作用将氨氮和铵根离子硝化而成为硝酸根离子,通过好氧回流处理控制好氧返回至细菌A池,在缺氧的条件下,异氧细菌的反硝化作用将硝酸根离子还原为分子态氮(N2),从而完成了碳、氮、氧在不同生态环境中的好氧循环,实现了在污水中的无害化综合处理,以有效去除各类城市污水处理中的化学悬浮物、氮、磷和有毒成分,使出水口的水质质量达到《城镇污水处理厂污染物排放标准》(GB18912-2002)一级A的标准[3]。

若采用A/O污水处理工艺来处理城市污水,A/O处理工艺将前段缺氧段和后段的好氧段连在一起。 异氧细菌在充足缺氧段将存在污水中的污染物和这些可溶性中的有机物游离水解为有机酸,使这些不溶性中的有机物经过分解而成为具有可溶性的其他有机物,大量小分子中的有机物经过分解后再转化而成为其他小分子中的有机物,当这些经充足缺氧段游离水解的有机产物直接进入水中好氧池,在水中进行好氧回流处理时,可大大提高其对氧的吸收效率以及污水的生态可生化性; 在充足缺氧段利用异氧细菌将水中蛋白质、脂肪等悬浮污染物污水进行游离氨化,即存在有机链上的氮活者氨基酸中的氨基会游离释放出氨和铵根离子(NH3、NH4+),在充足的供氧条件下,自养菌的硝化作用将氨氮和铵根离子硝化而成为硝酸根离子,通过好氧回流处理控制好氧返回至细菌A池,在缺氧的条件下,异氧细菌的反硝化作用将硝酸根离子还原为分子态氮(N2),从而完成了碳、氮、氧在不同生态环境中的好氧循环,实现了在污水中的无害化综合处理,以有效去除各类城市污水处理中的化学悬浮物、氮、磷和有毒成分,使出水口的水质质量达到《城镇污水处理厂污染物排放标准》(GB18912-2002)一级A的标准[3]。

If a / O sewage treatment process is used to treat urban sewage, the anoxic section of the front section and the aerobic section of the back section are connected together. In the sufficient anoxic stage, the anaerobic bacteria hydrolyze the pollutants in the sewage and the soluble organic matter into organic acids, so that the insoluble organic matter can be decomposed into other soluble organic matter, and a large number of organic matter in small molecules can be transformed into organic matter in other small molecules after decomposition, When these organic products are hydrolyzed in the sufficient anoxic stage and directly enter the aerobic tank in the water for aerobic reflux treatment, the oxygen absorption efficiency and the ecological biodegradability of the wastewater can be greatly improved; In the sufficient anoxic stage, the heterotrophic bacteria are used to free ammoniate the suspended pollutants such as protein and fat in the water, that is, the amino groups in the amino acids of the nitrogen living organisms in the organic chain will free release ammonia and ammonium ions (NH3, NH4 +). Under the sufficient oxygen supply condition, the nitrification of autotrophic bacteria will nitrify ammonia nitrogen and ammonium ions into nitrate ions, Under the condition of anoxic condition, denitrification of heterotrophic bacteria reduces nitrate ion to molecular nitrogen (N2), so as to complete the aerobic cycle of carbon, nitrogen and oxygen in different ecological environments, and realize the harmless comprehensive treatment in sewage, so as to effectively remove the chemical suspended solids, nitrogen and nitrogen in all kinds of urban sewage treatment Phosphorus and toxic components make the water quality of the outlet meet the first class a standard of the discharge standard of pollutants for urban sewage treatment plants (GB 18912-2002) [3].<br>