Study On The Movment And Conversion Of NH₃-N Of Wastwater In Simulated Land System

With rapid development of economy and society,Water pollution and lack of water resource has become the primary problem of global resource environment. At present,the pollution about nitrogen has became the problem many countries care about. 。 The land processing system is a natural cheaning method. And it is able to wipe off various of pollutions including ammonia nitrogen pollution.Therefore, land application system, as a superior wastewater treatmentand re-utilization system, is fully acknowledged again by its advantages and isdeveloped rapidly in the aspect of its technology, the application area and scope andits research.In this text, indoor-soil-body experiments are used to imitate land-application system ,following the percolation filtration medium , the strains a layer thickness and the changes of COD , ammonia nitrogen consistency , the season , temperature and the intakeing method.By scaring and analyzing the environmental factors such as various ammonia nitrogen concentration, pH in the aqueoue solution flowing the soil-body , tranforming behaviors, removal efficience and so onabout NH₃-N in the land processing system will be studied .Results indicate that the better removal effect for the high ammonium wastewater in the powder sand and the powder soil ,and the curve of the removal rate for ammonium has relation with soil quality , the point of mutation descends with the fall of temperature , the effect in the medium sand not obvious. The powder soil and powder sand is robust under varying inflow conditions. For the medium sand system of the low ammonia nitrogen , by shortening HLC ,the removal effect of the system is significantly improved. Nitrogen mineralization and high density CODcr also affect the removal effect of the ammonia nitrogen.The removal rate for ammonia nitrogen has certain relativity with pH in out-water.For the land system of dry-wet-alternation , the time of adsorb-saturation or the stability velocity of inwater may serve as the inundation- period .The period of dry can adopt the needing-time of adsorption -recovery to certain.In chengdu in winter, when inwater containing NH₃-N 400 mg/ 1 or so, outwater of depth 70cm in the powder soil has NH₃-N < 3 mg/ 1 and 100cm in the powder sand .At the summer, depth 40cm in the powder soil ,80 cm in the powder sandNH3-N < 3 mg/ l.If considered the absorption of the plants, the result is better. NH3-N has not servious influence for the shallow layer groundwaters, in the powder sand and the powder soil.The medium sand can develop removal effect for NH3-N < 100 mg/1. When not conducting prstrictly according to the certain movement method , the outwater in medium change greatly, not used for the place that has the shallow layer groundwater.A lab-scale experiment has been conducted to study the land treatment system the high ammonium wastewater. Through analyzing the conversion and movement discipline for NH3-N in details,Study Simulated on NH3-N in Land treatment is helpful to make use of Land Treatment system for wastewater treatment and make sense of the solution of NHa-N pollution to some extent.