Study On Start-Up And Operation In Anaerobic Biological Of High Salty Heparin Sodium Wastewater

Heparin sodium is helpful to anti-coagulation, reducing blood fat, anti-inflammatory and so on, its market demand has been relatively strong.China is the largest country on international producing and reporting crude heparin sodium, accounting for more than50%of international market share.In the process of producing heparin sodium,"three high"wastewater which has high salt,high COD and NH3-N is a problem in the field of wastewater treatment. It not only restricts the development of enterprises,but also causes great damage to the water environment in China.The existing studies,biological method is the most economical and practical processing method,used widely.Especially,the anaerobic biological treatment,which is one of the most important links in treatment of heparin wastewater with high COD.So,start-up of anaerobic biological process fast and stable is a key step in engineering practice.According to the characteristics of heparin sodium wastewater,the paper discussed the influential factors of microorganism domestication in start-up stage by laboratory study when using anaerobic biological to treat it,such as the initial salt concentration,salt concentration increasing load,HRT,trace elements and metal ions potassium.After the completion of the domestication,the paper also studied the heparin sodium wastewater for law of degradation organic matter and law of ammoniation in anaerobic reactor.The results show that:1、The optimal initial NaCl of domesticating salt-tolerance microorganisms is5000mg/L.COD concentration1000-4000mg/L,The salt concentration increasing load is2500mg/L The HRT is5days.Under these condition,the microbial can be acclimated to adapt the high salt concentration of30000mg/L,When the influent COD concentration is2000mg/L,the removal rate of COD is about75%after system stability.2、Add the trace elements are helpful to domesticating microorganisms domestication. When NaCl is15000mg/L,the COD removal rate, ammonification,the gas production and the methane volume fraction are increased by32.9%,59.6%,60.3%,35.6%after adding the trace elements; When NaCl is30000mg/L,the COD removal rate, ammonification,the gas production and the methane volume fraction are increased by30.6%,33.9%,81.7%,39.9%after adding the trace elements. 3. Under high salinity stress (NaCl is16000mg/Land24000mg/L),the deinhibition effect of metal ion potassium has to be embodied,it can increase COD removal,gas production and the methane percentage,but has little effect on ammonification.4. The influent organic and ammonia loading increased will lead to degradation of the COD removal rate,ammonification,the gas production and the methane volume fraction. When the influent COD concentration increased from990.5mg/L to19150.0mg/L and the influent NH3-N concentration increased from88.3mg/L to1709.1mg/L,the COD removal rate,ammonification,the gas production and the methane volume fraction are decreased by60.9%.37.6%.81.5%.6.0%。5.In anaerobic reactor,the HRT of treating heparin sodium production wastewater is7days.When the influent COD concentration is2000.0mg/L and influent NH3-N is245.6mg/L,after7days COD removal and ammoniation rate are75.7%,105.0%.6. Increasing and reducing salt concentration suddenly will decrease COD removal rate,but has little effect on ammoniation rate.It is worse to COD removal that salt concentration sudden reduced than it is sudden increased.But the system has some endurance for changing instantaneously of salt concentration,and it need more time to come back the initialization under low salt shock than high salt shock.