Research On Emergency Process When Switching Water Sources At A Water Plant In Inner Mongolia

Chinas groundwater resources is one of the important sources of drinking water,but due to the influence of urbanization and industrialization,the existence of groundwater sources in many places to varying degrees.The pollution situation.With the prominence of the pollution problem and the strengthening of the awareness of environmental protection,China has carried out a number of activities from the perspectives of policy,planning,treatment technology and so on.The National Groundwater Pollution Prevention and Control Plan（2011-2020）,issued in 2011.),the 2015 Water Pollution Prevention and Control Action Plan and the 2018 implementation of the National Centralized Drinking Water Sources The Special Action Plan for Environmental Protection,among others,provides norms and guidelines for action on groundwater protection,leading to a nationwide roll-out.Underground water body control actions.Among them,the Inner Mongolia Autonomous Region has promulgated the Regulations on the Protection of Drinking Water Sources in the Inner Mongolia Autonomous Region,the Regulations on the Prevention and Control of Water Pollution in the Inner Mongolia Autonomous Region,and the Regulations on the Protection of Drinking Water Sources in the Inner Mongolia Autonomous Region.Regulations and other documents that require the implementation of urban drinking water source environmental issues to manage the current state of their drinking water source Investigate and improve their problems.The original source of water was the flooded groundwater of a surface river in the south of the city,which had high organic matter,iron and manganese content,and there was slight Pollution phenomenon.In accordance with the Regulations on the Protection of Centralized Drinking Water Sources,the planned closure of groundwater wells for the purpose of conserving groundwater sources.And in order to protect the quality and quantity of water supply for the residents,a reservoir in near town was selected as the new water source.The study relies on the drinking water plant water source switch,water plant expansion project,the existing water purification process and the new water quality of the water plant.An analysis was conducted to determine an emergency process plan.At the same time continuously tracked the operating status and water quality of the water plant under the state of emergency process start-up,and according to the source water quality changes to the emergency process Operating parameters are adjusted accordingly to ensure water supply status,providing emergency process options for water plants switching from groundwater to surface water sources.Lessons Learned.The original water source of a city in Inner Mongolia was groundwater,with high levels of organic matter,iron and manganese in the water,which is slightly polluted.In accordance with the Regulations on the Protection of Drinking Water Sources of the Inner Mongolia Autonomous Region,it is planned to shut down underground wells for the purpose of conserving underground water sources,and at the same time.In order to ensure the quality and quantity of water supply for residents,a reservoir in a neighboring town was selected as the new water source.The study relies on a water plant in Inner Mongolia to switch the water source,water plant expansion project.The existing process of the water plant for groundwater purification process,is not applicable to the new source of water,that is,surface water purification of reservoir water,so the new surface water treatment plant.The emergency process will be used to treat source water until the new plant is commissioned.Combining the existing water purification process with the new water quality and the applicability of the process,the key technologies of the emergency process for water switching were identified.point.After the official activation of the emergency process continued to study the operating state of the water plant and the quality of the effluent under the state of emergency process start-up,and according to the source water Adjustment of emergency process operating parameters to ensure water quality for changes in water quality,for plants switching from groundwater to surface water sources.Provide lessons learned from the emergency water supply programme.The first step is to assess the quality of the new water source,and to determine the reservoir water quality by studying the hydrological and water quality data and sampling analysis of the hydrological stations in recent years.Basic characteristics.After comprehensive analysis,the reservoir water is characterized by low temperature and low turbidity in winter and minimal pollution in summer.At the same time,the total organic carbon analyzer,fluorescence photometer,liquid chromatography and gas chromatography/mass spectrometry（GC/MS）were used to further analyze the source water.The characteristics of the organic matter,including basic information such as the type of organic matter and molecular weight size.The main organic substances were identified as fulvic acid,humic acid and soluble microbial byproducts,with molecular weights mainly distributed in the following areas.The range of 5000 Da to 15000 Da.At the same time,the first phase of the water plant,the second phase of the water treatment process research,in order to grasp the new source of water quality and water plant process status of both content,which provides technical support for the development of emergency plans.Next,the contingency plan is determined.The water source switch is divided into two phases.The first phase is the use of a dual source of groundwater + reservoir water from June 9,2018,and the second phase is the December 6,2018 Since the complete use of new sources of reservoir water.According to the process conditions of the water plant,the analysis determined that the use of coagulation,high-efficiency activated carbon,in situ increase biofortification and other key technologies can ensure that the Water quality of the plant,emergency process operation by monitoring the water permanganate index,ammonia nitrogen,manganese and other water quality index changes in the analysis of emergency process The purification effect.At the same time in the dual-water stage of the plant,the turbidity and permanganate index fluctuate greatly at the beginning of the switch,with occasional exceedances at the beginning of the water supply,followed by a slight increase in turbidity and permanganate index.Other basic indicators tend to meet the standard consistently and steadily.During the single-source stage,the water quality is more stable,except for occasional fluctuations in the source water permanganate index,which is sometimes higher than the source water permanganate index.The standard values of turbidity,chromaticity,ammonia nitrogen,etc.all meet the effluent standard.Finally,the technical measures that need to be further adjusted in the emergency response process when the source water of the reservoir is affected by the sudden change in water quality by flooding are studied,and the use of Pre-oxidation with KMnO₄ or coagulation reinforcement with PAM and activated silicic acid as coagulant,while adjusting the amount of water treated in the plant The coagulation process is based on the results of a small-scale coagulation experiment to determine the relative optimization of the coagulation process.Through the field experiments to strengthen the coagulation process was studied,according to the experimental results of the coagulation process small test,to determine the relative optimization of the Process parameters such as dosage.