Design And Operation Control Research Of Starch And Vitamin B₁₂ Wastewater Advanced Treatment Process

In this paper,starch and vitamin B₁₂ wastewater of an enterprise was studied.According to the Characteristics of wastewater quality and status of wastewater treatment,by comparative analysis of conventional processing techniques,the study ultimately determine the use of "A/O+Fenton oxidation" combination as the advanced treatment technology of starch and vitamin B₁₂ wastewater.Be the main process design for this combined technology.Operation of A/O process and Fenton oxidation process,the results are as follows:1)Design calculations for A/O processing system and Fenton oxidation system in the main process parameters,process design parameters and determine the relevant structures corresponding size.According to the corresponding design parameters,the plane and elevation layout of the processing structures are carried out.2)The operation process of A/O process is divided into three stages: start-up,load increase and stable operation.Inlet water is the effluent of anaerobic system,and the concentration of COD and ammonia nitrogen in the wastewater were 500⁵50mg·L^-1 and300³50mg·L^-1,respectively.By gradually adjusting the influent quantity and the influent ammonia nitrogen concentration,the running load is improved.By controlling the control conditions of each stage to make the A/O system finally reach the stable operation state,the dissolved oxygen concentration in the control condition is 3.0⁴.0mg·L^-1,and the temperature is between 25³0?.The effluent COD and ammonia nitrogen concentration of A/O system were in 100mg·L^-1and 5mg·L^-1,respectively.The various factors affecting the A/O process were investigated.By analyzing the operation results of different operation conditions,the control conditions of each influencing factor are determined: the dissolved oxygen concentration is 3.0⁴.0mg·L^-1,the reflux ratio of nitrification liquid is400%.The running effect of the system is the best,and the A/O system is stable,and the impact load capacity is strong.3)According to the oxidation mechanism of Fenton oxidation process and the water quality of the enterprise wastewater,the optimal test conditions were selected.Finally,the optimal reaction conditions were as follows: the ratio of H₂O₂ to FeSO₄ was 2:1,the initial reaction pH was 4.0,and the reaction time was 90 min.When the influent COD concentration of Fenton oxidation system is 63.2mg·L^-1,97.6mg·L^-1,83.8mg·L^-1,theoptimum H₂O₂ dosage of unit volume raw water is 1.0ml·L^-1,2.0ml·L^-1 and 3.0ml·L^-1.According to the optimal experimental conditions,the results showed that the Fenton oxidation system was not affected by the fluctuation of the influent water quality,and the COD concentration of the effluent was below 50mg·L^-1,which could meet the requirements of the discharge standard.4)In this study,the treatment of starch and vitamin B₁₂ wastewater by anaerobic?UASB?system was studied by the combination of A/O+Fenton oxidation process,and anaerobic effluent COD and ammonia nitrogen concentration were 500⁵50mg·L^-1,300³50mg·L^-1,respectively.The operating results of the system show that the effluent COD and ammonia nitrogen concentrations were in 50mg·L^-1 and 5mg·L^-1,and the water quality meets the requirements of the first level A standard in the "urban sewage treatment plant pollutant emission"?GB18918-2002?.The process is reasonable,and the processing unit is efficient and stable.The amount of reduction of major pollutants: COD is greater than or equal to 2 227t·a^-1;BOD5 is greater than or equal to 940.5t·a^-1;ammonia nitrogen is greater than or equal to 1 707.75t·a^-1.Economic,environmental and social benefits are significant.