光电产业园区污水处理厂工艺研究

Study on Process of Wastewater Treatment Plant in Photoelectric Industrial Park

通过在实验室构建小试实验装置,以实际废水为处理对象,验证了水解酸化+A^(2)/O+化学混凝工艺作为某光电产业园区污水处理厂主体工艺的可行性,并提出了污水处理工艺中的关键参数的建议值,研究表明:采用完全混合型水解酸化工艺,可去除废水中部分COD且提高出水的BOD_(5)/COD值,提高废水的可生化性,当HRT达8 h时,出水的可生化性最高,达到0.29,再进一步延长水解时间出水COD虽然可进一步降低,但BOD_(5)/COD变小,为了使后续工艺能有更多可生物利用的碳源,建议工程设计中水解酸化工艺的HRT采用8 h;水解酸化的出水再经A^(2)/O处理,在外加碳源的条件下,A^(2)/O总HRT不低于18 h、好氧区HRT不低于12 h,出水中的COD、BOD_(5)、氨氮、TN均可降低到排放标准以下;单纯的生物处理工艺不能使TP达标,采用PAC作为化学除磷药剂,当铝:磷摩尔比为2时,出水TP=0.22 mg/L,可达排放标准,建议工程设计中铝:磷摩尔比采用2~2.5。采用水解酸化+A^(2)/O+化学混凝工艺作为主体工艺可实现废水的达标排放。

The feasibility of hydrolytic acidification+A^(2)/O+chemical coagulation process as the main process of the wastewater treatment plant in a photoelectric industrial park was verified by building a pilot plant in the laboratory,taking the actual wastewater as the treatment object,and the recommended values of key parameters in the wastewater treatment process were put forward.The study showed that the fully mixed hydrolytic acidification process could remove part of COD,improve the BOD_(5)/COD value of the effluent,and improve the biodegradability of wastewater,When HRT reaches 8h,the biodegradability of effluent is the highest,reaching 0.29.Although COD of effluent can be further reduced by further prolonging hydrolysis time,BOD_(5)/COD will become smaller.In order to make the subsequent process have more carbon sources that can be used biologically,it is recommended that HRT of hydrolysis acidification process be used for 8h in engineering design;The hydrolytic acidified effluent is then treated by A^(2)/O.Under the condition of external carbon source,the total HRT of A^(2)/O is not less than 18h,and the HRT of anoxic zone is not less than 12h.The COD,BOD_(5),ammonia nitrogen and TN in the effluent can all be reduced below the emission standard;The pure biological treatment process can not make TP meet the standard.PAC is used as the chemical phosphorus removal agent.When the aluminum:phosphorus molar ratio is 2,the effluent TP=0.22 mg/L,which can meet the emission standard.It is recommended that the aluminum:phosphorus molar ratio in the engineering design be 2~2.5.The hydrolysis acidification+A^(2)/O+chemical coagulation process can be used as the main process to achieve the standard discharge of wastewater.