| For the treatment of high organic and high nitrogen wastewater represented by membrane wastewater,the conventional biological treatment method adopts nitrification denitrification process to realize the simultaneous removal of organic matter and nitrogen.However,the nitrification process requires a lot of aeration and oxygen supply,and denitrification process requires a lot of nitrification liquid reflux and the demand of organic carbon source,The high concentration of pollutants will make the whole process face the problems of large volume of structure and long hydraulic retention time.The new technology with partial nitrification(PN)and anaerobic ammonia oxidation(ANAMMOX)as the core can realize low consumption and high efficiency denitrification.However,due to its self-supporting characteristics,it is more suitable for the treatment of low-carbon-nitrogen ratio wastewater.How to make the organic matter reasonably utilized and even resourced when facing the treatment of high organic and high nitrogen wastewater,It is worth further discussion to reduce the effect of organic matter on the autotrophic denitrification system.Therefore,the purpose of this study is to explore the reduction of carbon to nitrogen ratio by anaerobic digestion through the process establishment,and to combine anammox technology to treat high organic and high nitrogen wastewater.In this study,the actual membrane wastewater of Suzhou Sujing environmental protection new material Co.,Ltd.was taken as the treatment object.Aiming at the water quality characteristics of nitrogen containing organic matter with high concentration,the main objective of this study was to remove carbon and nitrogen efficiently,and carried out the research in the integrated pilot reactor(2m3)of UASB small scale reactor(3L)and ic-pn-anammox.In the UASB pilot study,the anaerobic biodegradability of the actual membrane wastewater was studied.The anaerobic digestibility of the reactor was investigated by adding ammonia nitrogen stress,the inhibition threshold and the inhibition form were defined,and the community response at the microbial level was observed;In the pilot study,the control means and parameters control of ic-pn regional joint start-up in the process of integrated reactor partition start-up,the effect of carbon removal and denitrification of integrated ic-pn-anammox treatment,and the parameter analysis affecting the performance change of each region of the reactor were discussed.The main conclusions obtained from the experimental study are as follows:(1)Under the condition of UASB small scale test,the wastewater was directly treated,inoculated with mature granular sludge,and the organic load(OLR)of the water was controlled at 35 ℃ at medium temperature(35 ℃),the COD concentration of the influent was 4200mg/l,the COD removal rate was about 83%,and the organic nitrogen was effectively degraded and the release rate of ammonia nitrogen was more than 90%.(2)The anaerobic digestion of membrane wastewater is affected by the concentration of free ammonia FA,and the concentration of FA is about 190mg/l,and the concentration of FA is half inhibition concentration;The inhibition of ammonia under high concentration of Tan can be relieved by p H regulation.(3)In the anaerobic methane producing bacteria group of long-term treatment of membrane wastewater,methyl nutritious Methanogylovorans and Metonomassiicoccus will replace the acetate nutrient type Metoanoseta and hydrogen nutrition type Methanobaranium as the main bacteria.(4)Under the condition of IC PN ANAMMOX,the wastewater from membrane production was directly treated.The organic load of the influent was 6.0kg/(M3 · d),the total nitrogen load(NLR)was 0.15kg/(M3 · d),the COD concentration of the influent was 3000mg/l,HRT was 1 day,the total COD removal rate could reach 85%,TN removal rate could reach more than 90%.(5)At the same load level,the mode of high COD concentration and long stay time of water inlet is more favorable for the joint start of IC PN.The COD concentration of influent is 3000mg/l,HRT is 1D,do in PN area is 0.4-0.7mg/l,which can ensure that FA concentration in PN area is 5-7mg/l and nitrite accumulation rate can be stabilized at more than 75%;The cod/tn of IC effluent is below 3.0,which can avoid the impact of organic matter on PN,which can affect the ratio of no2--n/nh4+-n in PN effluent.(6)In the combination process of IC PN ANAMMOX,the low reflux ratio will weaken the denitrification capacity of IC,and it can not further improve TN removal rate.The high reflux ratio will affect the stability of nitrification function in PN region.Compared with the non reflux,50% and 200% reflux,the NAR in PN region can be stable at more than 80% and TN removal rate is the highest when the reflux ratio is100%. |
