| Water is the source of life, and it is the essential basic condition of all thecreatures and social economic development. The sustainable utilization of waterresources and water quality security have become the problems that many countriesfocus on. Spatial distribution of water resource in China is not uniform. The southernwater is more than the north. Shortage of water resources has increasingly become thebottleneck of restricting China’s economic and social development. To alleviateuneven distribution of water resources, the state started to build the inter-basin watertransfer project. However, long distance water transfer project is faced with manywater quality safety risk issues, such as the discharge of sewage and industrial wastewater from urban residents along the water transfer project, agricultural pollutionrunoff from farmland fertilizers, pesticides, the discharge of sewage from the lines onthe ship, wharf, tourist area, wastes and fishermen regions and the pollutants fromrivers, lakes sediment due to certain factors stired and released into water. Therefore,wether the water quality security along water transfer project or not will affectirrigation system the purpose and significance of water diversion project.In this paper, Jiping main canal (Dongping Lake to jinan section) that is thebackbone of the first phase of the eastern route project which is the south-to-northwater trasfer project is the research object.After water quality in May and Junemonitored, the study found that channel in COD and ammonia nitrogen in Jiping maincanal fluctuate between class Ⅲ and class Ⅳ water quality standard.COD andammonia nitrogen is the main pollutants; water quality fluctuation in the waterconveyance canal during water trasfer phase and the key factors that affect thefluctuation are discussed. Reveal the incentive of water quality fluctuation in waterconveyance canal. In order to prevent the secondary pollution on water quality andenhance its mechanical strength, screen coal cinder, zeolite what are porous mediummaterial as filling substrate of strengthening water quality purification grid. In addition, the porous medium material is pretreated (mainly the removal of harmfulelements, the adjustment of pH), through theoretical analysis. At the same time, theadsorption ability of porous media material.The results were as follows.(1) After Coal cinder ball modificated, the heavy metal content in leaching liquiddropped obviously, and it wouldn’t cause secondary pollution if had been used forwater treatment material; Its adsorption capacity greatly increased because of itsdouble surface area, more rough surface, the porosity increased; The hydrophilicability of coal cinder ball had not been reduced.(2) Langmuir adsorption isotherm models and Ho level2dynamic model candescribe the cinder ball and zeolite adsorption reaction direction on the CODCrandammonia nitrogen respectively, the maximum adsorption capacity of adsorptionequilibrium, adsorption process and adsorption rate, etc. Coal cinder ball for CODCradsorption ability is than zeolite’s while coal cinder ball for ammonia nitrogenadsorption capacity is not stronger than zeolite’s.(3) After exploring cinder ball and zeolite adsorption effect on CODCrandammonia nitrogen under three different flow, results indicated that0.9m3/h is moreeffective for water inflow; The study found that the packing length of1m removingCODCrand ammonia nitrogen effect is significantly higher than0.75m and0.5m bycomparing three different packinglength’s adsorption effect.(4) The CODCrcontent in water samples is20-30mg/L, that can partly meet therequirement of less than20mg/L or similar to20mg/L.(5) When CODCrcontent in water samples is less than25mg/L, packing lengthis2m, mix proportion of cinder ball and zeolite is2:1and1:1,which can achieve Ⅲwater quality requirements. When the rate of cinder ball and zeolites is2:1and1:1,the removal rate of ammonia nitrogen is16.7%,18.2%respectively, which canachieve Ⅲ water quality requirements. |
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