Research On Key Technologies Of Water Supply Security For Huangjia Water Source In Shenya

The source of Huangjia Water Source in Shenyang City is located in the northern part of Shenyang City,with a mining capacity of 40,000 t/d,which is an important water supply source in the north of Shenyang.Its role is mainly to ease the current situation of water stress.Water quality monitoring of these groups of wells at the end of 2016 found that there were different levels of iron,manganese and ammonia nitrogen exceeding the standard.Because the water was taken from the riverside pumping well,the water quality that was pumped up was affected by the ammonia nitrogen in the Liaohe River and the iron and manganese ions in the groundwater.Excessive ions not only affect the pumping capacity of the tube well but also increase the processing load of the water purification plant.Therefore,research on the key technologies for water supply security protection in water sources is particularly important.Based on the original geological data,this paper considers the process flow of the riverside pumping water intake and studies and optimizes each link.The research on key technologies of water supply security mainly includes water environment quality assessment of water source,analysis of cause of water source water quality problem,research on safety technology of water supply pipe well,research on removal of iron and manganese and ammonia nitrogen technology in water purification plant,thus ensuring people's safety.Use water.Mainly complete the following aspects of work.1?The water quality identification index method was used to evaluate the surface water quality of Liaohe water near the water source.The results showed that the standard of Class? water could be reached during the wet season,but there were some indicators in the dry season,such as COD,BOD5 and ammonia nitrogen.In particular,ammonia nitrogen will pollute the water quality of the later well water.Principal component analysis showed that the A4 well group had the worst overall ranking and the most serious pollution.Comparing the well with the water quality standard,the total iron content of the well was 14.55 mg/L,the manganese content was 1.70 mg/L,and the ammonia nitrogen content was 0.52 mg/L,both of which exceeded the standard.The fuzzy mathematics method was used to evaluate the groundwater quality of the A4 well group.The evaluation result was V water and the groundwater quality was poor.2?The reasons for the excessive iron,manganese and ammonia nitrogen in groundwater were analyzed:the reduction mechanism of manganese iron ore and the migration of trinitrogen from river water to groundwater under reducing conditions.During the infiltration process,the DO value,Eh value,DOC,and SOC decrease with distance,indicating that the groundwater environment has undergone a process from an oxidizing environment to a weak oxidizing environment to a reducing environment.The water chemical composition of groundwater is 2.5m?4.0m,the most intense change is from 12.5m to 17.0m,Mn2+ reaches the maximum at 12.5m,and Fe2+ reaches the maximum at 17m.As the distance increases,the Eh value decreases to-160 mv,and SO42-undergoes a redox reaction.3?The ratio of the fractal dimension of different soil samples to the fractal dimension of the best graded packing material is linearly decreasing,and its expression is y=-0.2573x+2.2563.This rule is used to re-layer the water supply pipe well.4?The optimum process parameters for the modified manganese sand filter test are:flow rate 35mL/min,pH value 7.2,backwash cycle and duration are 18h and 5min respectively.The optimum DO value is 10 mg/L under clinker operating conditions.The removal of iron is preferred over manganese and ammonia nitrogen.It is basically removed within 10 cm of the filter column.The manganese and ammonia nitrogen have a dissolved oxygen content below 30 cm.The final manganese removal rate is 90%,and the ammonia nitrogen removal rate is only 73%.5?In the pilot test of pre-oxidation,the maturity stages of removing ammonia nitrogen and iron-manganese were different,Fe2+ was 18d,ammonia nitrogen was 25d,and Mn2+ was 30d.The adsorption and oxidation effect of the initial filter material on ammonia nitrogen is better than that of Mn2+.When the iron-manganese oxide film matures,the concentration of influent Fe2+has a great influence on the removal of Mn2+.The concentration of Mn2+ in the late stage of membrane loading has a great influence on the removal of ammonia nitrogen.There is a competing relationship between ammonia nitrogen and Mn2+.Through inactivation experiments,it was found that both ammonia nitrogen and Mn2+were affected by the action of microorganisms,and ammonia nitrogen was more affected by microorganisms than Mn2+.As the depth of the filter layer increases,the ammonia nitrogen continuously decreases and the nitrate nitrogen increases continuously.The variation range shows a certain correlation,and the change range is larger at 30-40 cm before the filter column.When the pH dropped from 8.5 to 6.5,the ammonia nitrogen removal rate showed a downward trend,especially at 6.5 when the effluent effect was the worst.6?The modified manganese sand filter material conforms to the first-order reaction rate equation:the reaction rate constant is 0.188.The adsorption performance accords with the Langmuir isotherm adsorption curve:the maximum adsorption capacity of the modified filter material is 0.35;the adsorption energy constant is 1.59.