Impact Of Wastewater C Content On The Transport, Transformation And Crop Uptake Of Nitrogen In A Trial Wastewater Irrigation System

Under the wastewater irrigation condition, the research of nitrogen transformation processes in the soil profile, regarding reasonably carries on the agricultural irrigation using the wastewater resources, reduces the nitrogen the loss and the underground water pollution has the vital significance.This experiment based on the soil column experiments, simulation the situation that has the crops to grow in the sewage land processing system, use the different carbon nitrogen content of raw sewage and the resurgent water, discuss the crops, the soil profile nitrogen transformation and the leaching quantity influence. the crops The e for experiment is the perennial ryegrass, the soil is the sandy loam, carries on the irrigation with the raw sewage and two level of processing water leakage, mainly studies the test content is: Fills, the displacement and the water quality (NH4+-N, NO3-N, TN, COD), in section plane soil solution various nitrogen density, crops dry weight and so on. The main test result is as follows:(1) Using the carbon nitrogen content high raw wastewater, the crops dry matter and accumulation dry matter quality is higher than reuse wastewater irrigation, it means raw wastewater which including higher nitrogen quantity can enhance the crops output.(2) Under the wastewater irrigation condition, the nitrogen density Changes in the law along with the depth is: The ammonium density reduces along with the depth increase, in the resurgent water irrigation system, the organic carbon content has no affects to the ammonium elimination and the use. Using high carbon content raw sewage irrigation, the nitric nitrogen and the total nitrogen concentration increase first along with the depth increase reduce, achieves the peak value in 40cm place; but with resurgent water irrigation, the nitric nitrogen and the total nitrogen concentration increase along with the depth increase, in the 70cm place maximizing, it means the high carbon content has advantageous to nitrogen denitrification function, is advantageous in the nitric nitrogen elimination. (3) The rule of nitrogen density along with the time is: The second sample NH₄⁺-N density is smaller than first time, the carbon nitrogen content is not remarkable to the ammonia nitrogen change affects; But to NO3--N and the TN, the high carbon content can promote nitrogen denitrification in-depth (70cm) soil solution. In each kind of nitrogen density reduces along with the increasing irrigation number and tends to gradually steadily;(4) The nitrogen (NH₄⁺-N, NO₃^--N, TN) density of irrigation water is much difference, but the draining water density differs slightly, along with the irrigation number of times, the tendency which increases the density to assume reduces, the leaching quantity also has the similar change rule. It mines the nitrogen density of drainage water has nothing to do with the draining water density in a certain extent, It is only decided by the soil environmental capacity; It Simultaneously also explains the high-carbon content can eliminate nitrogen, but the low-carbon content elimination degree is small, the carbon content is the main aspect which restricts N use and the.(5) Two kinds of Wastewater irrigation draining water appears the earlier period to be low, later period the high tendency, under the Reclaimed Water irrigation, displacement and accumulation displacement are higher than the raw sewage irrigation; The COD density reduces along with the depth of soil increase, two kind of irrigation water COD density has the big difference, but the draining water density difference is very small. It means the carbon nitrogen content differently has certain influence to the soil hole and the organic matter elimination degree.