Research On Microbiology Mechanism And Control Measures Of Blockage In GWHP

The water source heat pump air conditioning system has been widely used in recent years,because its system not only reduces the impact on the environment,but also belongs to the renewable energy utilization technology,and has made outstanding contributions in saving natural energy and reducing environmental pollution.However,due to the lack of technology,recirculation clogging restricts the promotion and use of groundwater source heat pumps,so it is necessary to find a solution based on the plugging mechanism.This paper takes the groundwater source heat pump project of Shenyang University of Technology as the research object,and through the hydrogeological condition analysis,outdoor monitoring test,indoor simulated recharge experiment and indoor test of blockage prevention,mastered the mechanism of blocked microorganisms in the water source heat pump recharge of Shenyang University of Technology.And proposed measures to solve the clogging of water source heat pump in Shenyang University of Technology.This research topic draws the following conclusions:(1)The groundwater in the study area is stable at 9-11℃ throughout the year and buried in the underground 8.0～12.0m.The pumping wells in the recharge well of the water source heat pump system in the study area are arranged in the Q3apl aquifer,and the return well is arranged in the Q1pal-fgl aquifer.The temperature and layout position can meet the demand of water source heat pump for water supply and return.According to the water quality report of the research area,the Fe ion content of the study area exceeds the "Design Code for Heating Ventilation and Air Conditioning,and belongs to the high-speed rail area.(2)The indoor simulated recharge blockage experiment was carried out in the winter and summer seasons,and the water flux of the nozzle was measured at the same time,and the permeability coefficient and relative permeability coefficient were calculated.And summed up:The closer the distance to the water inlet,the greater the change in permeability coefficient;The extent of change of the relative permeability coefficient of the winter water outlet is greater than the relative permeability coefficient of the summer water outlet with time;The porosity at the bottom of winter is more variable with time than the porosity at the bottom of summer.The closer the research area is to the water inlet,the earlier the blockage occurs,and the farther away from the water inlet,the later the blockage occurs.In the winter,the water source heat pump of Shenyang University of Technology is prone to blockage during the recharge process.(3)The literature states that iron bacteria can participate in the mutual conversion between Fe2+ and Fe3+ in different conditions,because the concentration of Fe ions in the study area exceeds the standard,and the recharge water in the experiment is configured according to the ion concentration in the study area.Therefore,Iron bacteria causing clogging were identified in the recharge water in the later stage of the simulation experiment.(4)By setting up two groups of iron-free bacteria comparison experiments,it was concluded that the presence of iron bacteria had a positive impact on the blockage of the study area.And summed up:The decrease of the permeability of the medium during the recharge process is caused by the bacteria itself.When the bacteria are in the decline period,it is mainly caused by the increase of the extracellular polymer content.In the middle and late stages of the percolation,the bacteria and the EPS are common.The effect,and the decrease in media permeability,is also related to the oxidation of iron ions in the study zone by FB oxidation to Fe3O4.(5)In order to solve the problem of microbial clogging in the study area,five kinds of dissolving agents were selected,and five kinds of devices were set up.The first group added hydrochloric acid,the second group added sodium hydroxide,and the third group added surfactant sodium alkylbenzene sulfonate.The fourth group added sodium hypochlorite,and the fifth group added tap water.It was concluded that the addition of the five stripping agents had a positive effect on the recovery of the permeability coefficient,but the effect of sodium hypochlorite was the most active,and the microbial was greatly reduced.(6)Three kinds of leaching agents,NaOH,HCl and NaClO,were added to the plugged column in different order.It was found that the order of HCl,NaCIO and NaOH was significantly improved.This method can provide positive guidance for the treatment of blockage in the research area.The name of this project is the research on microbiology mechanism and control measures of blockage in GWHP,and combined with the actual operation of water source heat pump of Shenyang University of Technology,and simulated recharge experiment in the laboratory,some blocking mechanisms and prevention measures have been initially obtained.The experimental results provide a theoretical basis for solving the problems in the actual operation of the research area system.