Research On The Efficiency Of ASBBR Reactor For Pickle Wasterwater Treatment

This paper is aim at the characteristic of high salinity pickle wastewater; Anaerobic Sequencing Batch Biofilm Reactor (ASBBR) is adopted as the anaerobic treatment process. Its high efficiency and common temperature is characterized. Through inoculating high efficiency salt tolerant bacteria which is selected form high salinity bloat pickle wastewater, the starting time of anaerobic reactor is greatly shortened. The most prime operating state of ASBBR has been research too, and the integrative influence produced by salinity, temperature and loading rate on the efficiency of ASBBR are investigated. In the problem of worse treatment efficiency of ASBBR reactor at low temperature, by increasing biofilm density and adding betain. can improve the efficiency of the reactor. In the problem of restraining produced by salinity in the bloat pickle wastewater, by adding betain into reactor, which can efficiently reduced restraining of high salinity on the anaerobic microorganism activity. Moreover, a restraining dynamics model of organics removal has been founded. The main conclusions are as follows:(1) Study on the effect of loading rate on the efficiency of ASBBR reactor treating pickle wastewater indicate that: Considering the demand of carbon source in the subsequent denitrogen, on the conditions of temperature at 30 ℃, the loading rate is 4KgCOD/m3 · d, HRT=12h, A =1/2, biofilm density is 50%, it can reduced inflow that salinity (10000mg/L ,as Cl-), COD (4000mg/L) to COD (1520mg/L) in the outflow, the removal rate of COD achieves 62% When efficiently utilizing the ASBBR reactor to remove COD, the temperature at 30 ℃, the running state of the loading rate is 0.22KgCOD/m3 · d, HRT=3d, A =1/6, biofilm density is 50%, it can reduced the inflow that the salinity (10000mg/L ,as Cl-) , COD (4000mg/L) to COD ( 95mg/L),in the outflow, the removal rate of COD up to 97.5%.(2) Study on the effect of temperature on the efficiency of ASBBR reactor treating pickle wastewater indicates that: The most prime running temperature in the ASBBR reactor treating pickle wastewater is 20-30 ℃. When the temperature at 10 ℃, the efficiency of reactor reduced markedly, η cod decreased by 32%. At the low temperature, when the bioflim density increase to 70%, it can make η COD increase by 4.5%; at the same time, adding 0.1mmol/L betain into the reactor, the ηcod can increase by 9.5%.(3) Study on the effect of salinity (as Cl-) on the efficiency of ASBBR reactor treating pickle wastewater indicates that: When salinity is more than 10000mg/L, the salinity will obviously produced restrain on the ASBBR treating high salinity pickle wastewater. When the temperature at 30℃ and salinity is 10000mg/L, η cod is 90.3%. When the salinity increase to 20000mg/L, η COD descend to 82%, and when the salinity increase to 30000mg/L, ηcod descend to 49.3%. When the temperature at 30℃, salinity is 20000mg/L, η COD is 28.75%. Add 0.08mmol/L betain into the high salinity pickle wastewater, it can resume the anaerobic microorganism activity effectively, dehydogenase content increase from 6.01 μ gTF/gMLSS . h to 12.13 μ gTF/gMLSS . h, it increases one time, η COD increases by 19%.(4) the integrative influence produced by salinity, temperature and loading rate on the efficiency of ASBBR is investigated.the study results indicate that: The orthogonal experiment regression equation of the integrated effect of salinity and loading rate is : COD 出水=-686.17+353.33Nv+0.075p, salinity p effect the outflow COD markedly, next loading rate; The orthogonal experiment regression equation of the integrated effect of salinity and temperature is : COD 出水=1515 +0.072 P -69.1 t, temperature effect the COD in the outflow markedly, nexts to salinity p ; The orthogonal experiment regression equation of the integrated effect of temperature and loading rate is : COD 出水 = 1985.83+433.33Nv-67.501, temperature effect the COD in the outflow markedly, the influence of temperature on outflow nexts to loading rate.(5) Study on the dynamics of ASBBR treating pickle wastewater, a salinity restrain dynamics model of degradation of organics at low temperature can be found:λ(C0- Ce)=-Ks (ln(Ce- λCe+ λC0)-ln Ce) +HRT ·k·X, in which dynamics constant Ks and k is related to salinity p , the equation can be expressed that: Ks = -12.566p + 856.37, k = 0.00002p2-0.0011p + 0.029.The study results above will effort some scientific basis for pickle wastewater treatment projects. Which have some practical significations.