Study On The Commissioning Of Sewage Treatment System In A Ammonium Nitrate Chemical Enterprise

Ammonium nitrate chemical enterprise wastewater is characterized by complexcomposition, poor biodegradability and high concentrations of ammonia nitrogen.Untreated wastewater containing high nitrogen content that is discharged to theenvironment would cause great harm. Therefore, this paper undertakes a commissioningresearch for the sewage treatment system of this ammonium nitrate enterprise to obtain theoptimal operating parameters, making the effluent to meet the discharge standard, which isof great importance for the surrounding environment of the enterprise.This ammonium nitrate chemical enterprise sewage treatment system adoptedfacultative basin-A/O joint process. In this issue, we carried out a series of studies fromthe startup to the commissioning test of the sewage treatment system, focusing on theeffect of various operating parameters.By inoculation of culture, we has taken thirty days to complete the vaccination anddomestication of the sludge. The effluent COD during startup can meet the nationalwastewater discharge standards, however, the effluent NH3-N was beyond the standard, sowe focused on denitrification in the next step. In the trial operation stage, the effluentCOD and SS can compliance, and the effluent NH3-N can meet emission standards in thecondition of the influent NH3-N meeting the design requirements.For the high NH3-N content in the effluent, this study analyzed the water quality,dissolved oxygen, SV30, water temperature and other factors on the treatment effect.Analysis suggest that influent NH3-N concentration exceeds the design requirements of80mg/L, thus measures should be taken to strictly control the influent NH3-N. C/N ratioshould be contained approximately between3and4to suffice denitrification and thedissolved oxygen in each basin should be controlled within a reasonable range (aerobic tank1.5mg/L, anoxic tank0.5mg/L and facultative pond inlet1mg/L) to facilitate the removal ofNH3-N content. SV30and sludge age is relatively important in NH3-N removal that SV30isbetter kept at20%, sludge age at about15d. Hypothermia has a certain negative impact onthe treatment effect, water temperature is therefore better contained between20and30.