Study On The Characteristics Of Dispersed Swine Wastewater Treatment With Functional Zoning Type Artificial Wetland

In present,dispersed hoggery existed in the vast rural areas and pollution wasserious.In view of the situation, based on the understanding of the characteristics ofwater quality and emission, this article built functional zoning type enhanced nitrogenremoval artificial wetland based on biological zeolite.The feasibility of treatment ofsimulated source separation decentralized swine wastewater was studied, and in shakeflask batch experiments and artificial wetland continuous experiment studied on thebiological zeolite fast adsorption of ammonia, characteristics of biological regenerationand operating characteristics of artificial wetland.This research analyzed with16sribosomal DNA sequence analysis of microbial community structure in differentfunctional areas of wetland. The conclusions of this research are as the following:（1）The adsorption rate of various particle size of zeolite to ammonia nitrogen wasvery quickly, and after the start of the5min, removal rate of zeolite for ammonianitrogen was nearly40%.Cation ion in zeolite exchanged with ammonia nitrogen weremainly Na+,followed by Ca2+,and with the extension of adsorption time, ratio ofequivalent concentration of Na+to tolal metal ion decreased, while Ca2+was on thecontrary.（2）There was obvious influence of limestone on the zeolite regeneration process.When the biological zeolite and limestone quality ratio was5:1, the amount ofregeneration was maximum,and it was5.15times as many as the control sample withoutlimestone.5.00mg/L of allyl thiourea and1.56mg/L of sodium azide had obviousinhibitory effect on nitrous acid bacteria and nitrate bacteria respectively.Microorganisms played a leading role in the regeneration process of mixture system ofbiological zeolite and limestone.（3）Adding reinforced oxygen pipe in enhancement of organic matter and TNremoving zone of wetland could enhance the ability of reoxygenation. It could improvethe removal rate of ammonia nitrogen and production rate of nitrate nitrogen, and didnot cause accumulation of nitrite nitrogen. When the zeolite layer thickness was30cm,the influent load was1.5L, the flow rate was50mL/min and the influent time was30min,the nitrification ability of wetland was maximum, and the removal rate of ammonianitrogen did not exceed the rate of regeneration. （4）Adsorption of biological zeolite to ammonia nitrogen and regeneration inenhancement of nitrification zone of wetland was a rapid process,80%of ammoniaadsorption and regeneration capacity could be completed in5min,while the entire timewas30min.The average rate of nitrate produced was0.0423kg/m3·d, nitrite nitrogenhad no accumulation,and the ability of reoxygenation was good. When watered onceeveryday and zeolite layer thickness was6cm, the wetland had optimization effect.（5）The biofilm on the surface of zeolite in organic matter and TN removal areawas thick,while the biofilm on the surface of gravel and zeolite in strengthennitrification area was sparse. The biofilm mainly consisted with cocci and bacilli. At thedivision level, the dominant bacteria on the surface of zeolite in strengthen the organicmatter and TN removal area and strengthen nitrification area were Proteobacteria andFirmicutes. Nitrifying bacteria were identified in the biofilm on surface of zeolite intwo systems, surface of zeolite in strengthen organic matter and TN removal area alsodetected the denitrifying bacteria.