Research On Typical Waste Dissolved Oxygen Distribution Characteristics Of Yangzhou And Oxygen-rich Technology

Yangzhou is located in the middle of Jiangsu province, domestic water system developed, with front pillow accelerated development of urban economic construction of rivers, lakes, Yangzhou by different levels of pollution, especially through the city’s more than20river water pollution is serious, need to water in the long run, environmental protection and water environment, ecological safety maintenance.Based on this topic of Yangzhou city of various typical water dissolved oxygen distribution rule and oxygen transfer mechanism and the water quality and the relevance of surveys and studies, the Dobbins-Camp BOD-DO water quality model, CODMn insteading of BOD. For river dissolved oxygen equilibrium calculation and maintain end dissolved oxygen in the water flow, thereby effectively optimize Yangzhou city stream hydrating control techniques, save resources. And developed sturry interface oxygen-rich device, and then improve low dissolved oxygen in the water bottom situation. This article chooses Yangzhou city typical water research season, daily variation of dissolved change, vertical change rule. Selection of large river for old canal; Small river for two river; Shallow lakes for lake and lily pond. Dissolved oxygen season changes:winter for the highest levels of87.64%average saturation; Summer79.07%followed for an average of saturation, age season content for54.78%minimum, average saturation. Change is on the surface of dissolved oxygen after sunrise to rise gradually,16:00reach peak afternoon, then gradually decreases. Spring, summer, autumn surface dissolved oxygen in the water changes tremendously, middle and bottom, dissolved oxygen in the small scale, the change of the bottom of the table and winter diurnal change of dissolved by much. In the space, mainly exist vertical direction different depth change, that the increase of dissolved oxygen content with depth, gradually reduced. Such as2meters deep lily pond summer2010July29, surface and ground floor of dissolved oxygen saturation sent164.28%. But the winter of vertical variation of oxygen is not big, such as lily pond winter on7January2011at the bottom of the list of dissolved saturation difference value is for2.93%. Obviously, winter water dissolved oxygen content high, changing and spatial variation is very small.On the way of joint of hongqiao sections and lily pond as an example, this paper analyzes variations found in yangzhou city river water quality eutrophication serious, two river of total nitrogen content range1.02～4.12mg/L, mean2.28mg/L. Achieve eutrophication standard5.1～20.6times. Lily pond total nitrogen content range for3.76～4.68mg/L, mean4.30mg/L, achieve the eutrophication standard18.8-23.4times. Two river total phosphorus scope for0.12～0.45mg/L, mean0.21mg/L, achieve eutrophication standard6-22.5times; Lily pond total phosphorus scope for0.26～0.51mg/L, mean0.34mg/L for eutrophication, reach the standard13～25.5times.Through the laboratory simulation determination, oxygen consumption rate sediment p1(mg/m2.h) and temperature T(℃) in a linear relationship:p1=aT+b, a, b and sediment characteristics for the parameters related waterways. Ancient canal seven sections of a=1.835～3.0104,b=-11.038-6.7189.Eleven main inland water around a=2.3925～6.8412,b=-28.454～11.069, Slender West Lake a=2.3925,b=-11.069, Lily pond a=1.5566, b=8.7493.Yangzhou inland summer unit concentration chlorophyll (muon g/L) photosynthesis production0.0421mgO2/(μgChl.d), autumn0.0299mgO2/(μgCl.d), winter is neglected. Yangzhou inland summer the algal growth rate for25.758μg/L.d, autumn algae growth rate for16.206μg/L.d. Winter algae grow extremely slow, growth rate can be considered0, that is the summer with a large range of dissolved diurnal variation of water, the reason than age season summer dissolved oxygen. According to yangzhou city water depth range, by comparison, this paper adopts Churchill formula method to calculate the water surface coated oxygen flow rate.Invented in situ determination method for determining the total pollution load river bear R. Through the determination of sediment pollution simulation in laboratory studies, the releasing characteristics with the temperature rise CODMn, TP, NH4+N, TN release rate faster, but each monitoring section increasing range is different. From10℃temperature increased to30℃, release rate increased all several times.Calculation of static river outfalls within a day, the two river should be added air-supply summer, autumn and winter116.13kg/d,7.29kg/d,39.8kg/d. Try calculate summer, autumn, winter security river ends to maintain DO>2mg/L at the V class need8.7×10-3m/s,1.02×10-3m/s,3.72×10-3m/s. Again according to the cross-sectional area computation needed river flow of minimum hydrating0.2349m3/s,0.02754m3/s,0.10044m3/s.The subject development facade bounded oxygen-rich device, on the bench and field test research. Interface oxygen-rich was in300L/h device under oxygen-rich ability aeration quantity supreme;100L/h in aeration quantity next oxygen top utilization rate. Interface oxygen-rich device oxygen-rich ability OC and oxygen in water utilization EA1.5m place is the highest. From OC～aeration quantity and EA～aeration quantity curve changes to that, along with the water depth increases unceasingly, oxygen-rich ability and the utilization ratio of water depth of unit of oxygen. The bigger changes value Show interface oxygen-rich device can be made to the underlying water oxygen-rich, thus inhibiting the release of sediment pollutants. Along with the increase of gas, water lily pond and dissolved oxygen in the vertical differences more and more smally, and fluctuation water dissolved oxygen content also increased.