Study On Pilotscale Experiment For Treatment Of Piggery Wastewater By UASB-SBR

There was produced large amounts of waste by the rise of large-scale aquaculture,especially the pig farms produce a lot of waste water caused a serious impact on the surrounding environment,and have serious pollution on the surface water,groundwater,soil,atmosphere and others.There have a variety of processing mode at domestic and foreign for swine wastewater which have high ammonia,high concentration of organic matter and suspended solids concentration and other characteristic.field use for the swine wastewater teratment has been limited due to the farmland use shortage in our country,the effect of seasonal have lagerly for the nature treatment and it's difficult to promotion especially in the northeast and other cold areas.Industrial processing mode have good removal for swine wastewater through the joint intensive processing mode and increasingly becoming the trend of the application for this water.The combined process for treatment of piggery wastewater by UASB-SBR,the pilot study with actual wastewater in pig farms after the laboratory research stage,investigated the UASB,SBR reactor switch on stable operation at room temperature,and investigate the different impact of factors on the reactor,indicated that the UASB-SBR process have a good pollutant removal for piggery wastewater,and have provided technical support for this type of wastewater treatment.For the UASB switch on was divided into two stages at continuous flow,the volume load increased by increase the influent concentration and influent flow,the final COD removal rate remained stable at 70%or more through the sludge acclimation period and the load increase stage in 75d.Examine the reaction of ammonia nitrogen,total nitrogen,total phosphorus removal,the anaerobic reactor only have 20%removal rate because of anaerobic system.monitored pH and anaerobic sludge concentration and particle size of the inspection at the whole stage showed that the anaerobic sludge did not happen the phenomenon of acidification,and the gas production rate eventually reached 0.6 m3/(m3·d).Explore the influence of different temperatures on the reactor operation,the temperature in 24 the removal rate of COD at 75%.With different volumetric loading test,the smaller flow was not conducive to the operation of the reactor,the best volumetric loading is 5.122 kgCOD/(m3·d)consided of the flow and effect of removal.SBR and UASB switch on at the same time,UASB effluent as the SBR influent.Investigated the optimal mode of operation,determine the reaction period of time:2h before mixing+6 h aeration+2 h after mixing,pollutant removal is better with the running of the reactor in this condition.COD have basically removed,effluent COD below at 400 mg/L,90%of the ammonia is removed at this stage.TN removal rate at about 65%.Through the formation of nitrate and nitrite nitrogen,nitrite accumulation and become shortcut nitrification under the influence of temperature and DO,nitrite accumulation at 80%.Investigated the influence of different temperatures for removal rate of ammonia,the removal rate in 85%at room temperature,nitrite accumulation was clearly at the tempreature 12 more than 22.Long aeration will affect the formation of nitrite conversion to nitrate.Inspect the aerobic sludge concentration and settlement performance,the sludge concentration at 3000 mg/L the activity was significantly increased,and the SV30 was about 20 and settling characteristics obviously improved.Study the situation of pollutant removal by UASB-SBR on piggery wastewater treatment at stable running,the pollutants have largely been removed and reactor combined treatment have batter effects.And COD?ammonia?SS reach the standard of livestock wastewater discharge.