The Affection Of Fracturing Flow-back Fluid Treatment By Nature Gas Exploit For The Sandy Vegetation

With the change of energy structure,increasing natural gas production in China.A lot of mud,rock debris and the sludge of fracturing flow-back fluid by nature gas exploit were generated.However,large amounts of the sludge of fracturing flow-back fluid by nature gas exploit(gas production sludge)were stack in open air.Such as we lack effective technology to disposal the sludge.To solve the gas fracturing fluid flow-back sludge difficult to disposal predicament for Sinopec in Inner Mongolia(hereinafter referred to as:gas production sludge),reference for urban sludge and solid waste disposal method.Resource-oriented utilization is generally high recognition approach,including returning sludge farm is one of the most important way to recycle.Much investigations has shown the city sludge can improve the soil nutrient content,improve soil structure,promote plant growth,but its has little research for composition of the gas production sludge,and it improvement soil and influence on plant.Therefore,the soil of Mu Us Sandland,gas fracturing fluid flowback sludge from Sinopec in Inner Mongolia,the domestic sludge of Ordos Dongsheng district north water purification plant and three plants(Artemisia desertorum,Lolium perenne L.,Medicago falcata L.)was researched in this paper.Set different doses of sludge,compressed CO as blank,gas extraction respectively applying sludge content,2.5%,5%,10%,15%,10%,doses of domestic sludge was 10%.The characteristics of sludge composition,the influence on sandy soil physical and chemical properties by gas production sludge,and the sludge effect on plant growth were researched.The results are as follows:? The contents of heavy metals and harmful organic contaminants were very few in gas production sludge,such as contents of m(Cr)?m(Cd)and m(Pb)were 35.19,0.18 and 5.5 mg/kg,PAHs were under observed effect concentration.The organic matter and nutrients(NPK)were small content,respectively 1.46%,0.32%,0.09%,0.15%,but the salinity was 0.12%in gas production sludge.The risk assessment of 13 heavy metals results indicated that the Igeo of Cr,Cd,Pb were-0.76,-8.69 and-2.20,account for none environmental contamination risk,but the Igeo of Se,Ba were 0.02 and 0.91,indicate had mild environmental contamination risk.? The sand maximum water holding capacity,the capacity of soil water and the sand porosity were improved by involves in gas production sludge,its also lower sandy soil bulk density.The maximum water holding capacity,water retention capacity and porosity of soil were increased 74.41%,14.29%and 4.35%with the content of gas production sludge application was 2.5%.? The gas production sludge did increased the seed germinate of Artemisia desertorum,Lolium perenne L.and Medicago falcata L.were 7.38%,3.61%and 8.20%when the mixture ratio was 2.5%,if the gas production sludge application amount exceed 2.5%would control seed germinate.? Comprehensive consideration the gas production sludge impact on the height,root height,fresh weight content of three plants were detected during growth period.The feasible gas production sludge application amount for Artemisia desertorum,the Lolium perenne L.and Medicago falcata L.were no more than 5%,at most 5%and at most 2.5%.However,domestic sludge was mixed with gas production sludge impact on the height and fresh weight content of three plants were researched.The results indicated that the feasible gas production sludge application amount for Artemisia desertorum,Lolium perenne L.and Medicago falcata L.were no more than 5%,at most 5%and at most 2.5%.The study indicated that desert area plant tolerate the amounts of gas production sludge was low,we need increase contents of gas production sludge application by pollutant removal;choose tolerant plants etc,as the content of it application is little.