Dairy Wastewater Process

With the development of modern breeding technology, poultry breeding's direction is high quality and efficiency, it become a highly specialized production. However, at present, the large amount of wastewater from the poultry breeding is mostly discharged directly without appropriate treatment, so it produces a comparative pollution to the environment. The essay contraposes the wastewater quality and the actuality that is single treating method , not considered ammonia nitrogen removal, complicated technology , higher cost and less application, and considering the characteristic of milk cattle wastewater which includes higher organic mater , ammonia nitrogen , fiber and cacosmia, a method to treat milk cattle wastewater was proposed, that is ABR-flocculation and precipitation- ICEAS.The essay disposes the milk cattle wastewater by ABR-Flocculation and Precipitation-ICEAS, the results from experiments indicates that 70-75%COD_Cr can be treated by ABR, 85-90%COD_Cr can be eliminated by flocculation and precipitation, 85-90%COD_Cr and 92-98% ammonia nitrogen can be removed by ICEAS. COD and ammonia nitrogen removal is respectively above 98% and 94% in the treating technology; Finally, discharged wastewaters are up to standards.By systemic research, the experiment makes the start-up and run condition of each unit, that is respectively: ABR moderate start-up: 1)temperature is 35 ℃,quantity is 3-6L/h, COD concentration in influent is 1000mg/L,HRT is 17-34h, Nv is 0.72-1.44kgCOD/(m³·d) , MLSS is 38-50g/L;2)flocculation and precipitation: temperature is 20 ℃, stirred time is 2min, precipitation time id 10min, pH is 7.35, COD concentration is 500-2000mg/L; through comparing flocculation precipitator, the experiment chooses chloride ferric, and confirms the relation curve on COD concentration in certain range and chloride ferric;3)ICEAS experiment: through designing different periodic unit, influent flow, influent density of ground substance and reflux ratio et al, the COD_Cr and ammonia nitrogen removal is examined about reactor, and finally in the influent ground concentration 750mg/L condition, the experiment determines the best process conditions: period 9.5hours(aeration time 8...