Study On The Optimization Of Water And Sediment Separation Adsorbents In The Yellow River And The Sediment Soil Improvement After Separation

In recent years,drip irrigation has been widely used as one of the main water-saving methods in the agricultural sector.However,drip irrigation belongs to agricultural fine irrigation,and the pipe diameter of the drip irrigation system is small,which is prone to physical,chemical,biological and other forms of blockage,affecting irrigation efficiency.How to use new technologies,new methods and new ideas to realize the development of water-saving agriculture in the irrigation area of the Yellow River has become the focus of multi-disciplinary research in agriculture and water conservancy in the Yellow River drip irrigation area.In order to solve the problem of clogging of the irrigator during drip irrigation and to realize the reuse of flocculated sediment resources,this paper sets the water quality under different sediment conditions and different temperature conditions through indoor test and outdoor test,and optimizes the adsorption under different water quality conditions.The outdoor platform drip irrigation test was used to further verify and analyze the changes of flow rate and uniformity of the drip irrigation belt.Finally,the influence of flocculation sediment on the soil water retention and fertility of the sand soil was studied by indoor soil column and pot experiment.The main findings are as follows:(1)The adsorbent has a significant decrease in the turbidity index in water quality.The water content of the drip irrigation water source is less than 5kg/m3,and more by using CS-001(Hangjin 2#soil,activated carbon)medicine,and the dosage is 40g/m3?50g/m3.When the sediment concentration of water is higher than 5kg/m3,CS-005(Kaolin,activated carbon)adsorbent should be used,and the dosage is 80g/m3?90g/m3.In this paper,the optimum ambient temperature for flocculation of adsorbents should be maintained above 15?.(2)The sediment content in the Yellow River water is between 1kg/m3 and 1.5kg/m3 in recent years.Therefore,daily drip irrigation uses CS-001(Hangjin 2#soil,activated carbon)as a filtering drug.CS-001 has the effect of removing and purifying turbidity,total nitrogen and total phosphorus in water with different sediment content,and the turbidity is reduced by 97%on average.Drip irrigation was carried out using water quality under different sediment conditions.After treatment with "Water Dream"comprehensive filtration equipment,the irrigation uniformity of the two drip irrigation belts(NETAFIM,Ruisheng)and the average flow reduction degree of the irrigation were analyzed.A NETAFIM inlay patch drip tape with a larger diameter(diameter>16.2 mm)should be used during the yellow drip irrigation process.(3)Flocculation sediment can effectively improve the moisture content of sand.Saturated water content,field water holding capacity,and capillary water content increased with the increase of flocculation and sediment application.The amount of sand added to treatment T4(100g/kg)was the highest,which was 53.1%higher than that of the control treatment;the field water holding capacity was increased by 74.2%compared with the control treatment.The addition of flocculated sediment can improve the water retention of sand,and the saturated hydraulic conductivity and soil water diffusion rate decrease with the increase of flocculation and sediment application.When the application amount of flocculation sediment is 100g/kg,the water holding capacity of sand is maximized.Under the same soil negative pressure,the more the flocculated sediment content,the greater the water content in the soil.(4)Flocculation and sediment significantly increase the content of various nutrients in the sand.Under the application of 60g/kg and 100g/kg flocculation sediment,the organic matter content in sand increased by 57.8%?71.8%.Flocculation sediment has a significant positive effect on tomato yield and growth regulation.The yield of 60g/kg is the largest increase compared with the control treatment,which is 93.8%.However,excessive flocculation and sediment will lead to a decrease in yield.Therefore,the application of appropriate amount of flocculated sediment can effectively promote the growth of plant height and stem diameter of tomato plants in each growth period.By comprehensive analysis,in the process of recycling flocculated sediment to improve soil,the recommended optimum application rate is 60g/kg.