Design And Research Of High Nitrogen Wastewater Treatment And Recycling Engineering In Photovoltaic Industry

Suzhou National High-tech Zone is located on the shore of Taihu Lake.With the rapid economic development,it attaches great importance to ecological and environmental protection work.Because of the heavy burden of wastewater discharge in a photovoltaic enterprise,it is impossible to make it bigger and stronger;because of the difficulty of users to find a sewage plant in a town,the reclaimed water reuse rate can not reach the standard;because of the insufficient actual water treatment,the supporting copper-containing wastewater pretreatment facilities of a Taiwanese-funded computer company are seriously wasted.In order to solve the above three problems,the project takes green recycling economy as the concept,seeks for the optimal treatment mode and realizes the principle of maximum benefit,and innovatively puts forward the wastewater treatment and recycling of "in-plant quality pre-treatment + outflow industrial sewage treatment facilities + municipal sewage treatment plant treatment + recycling of recycled water".In the new model,a third-party company leased a pretreatment facility for copper-containing wastewater and enhanced denitrification to treat the dilute nitrogen wastewater from photovoltaic enterprises.Relying on the biochemical treatment facility of a municipal wastewater treatment plant and the advanced treatment facility proposed by photovoltaic enterprises,the dilute nitrogen wastewater after meeting the standards was further treated.Then regenerate and reuse.The implementation of this project solves the problem of wastewater treatment that puzzles photovoltaic enterprises,effectively increases the load rate of copper-containing wastewater pretreatment system,and also meets the requirement of reclaimed water reuse rate in urban wastewater treatment plants.It is a win-win plan for all parties.For the renovation of existing facilities and the design and research of some new facilities,it is necessary to fully consider the addition of denitrification and reclaimed water reuse facilities on the basis of not changing the inherent functions of existing facilities,as well as the impact on the biochemical system of sewage treatment plants and the connection and integration of new and old facilities.In this paper,by means of theoretical research combined with specific engineering design,through investigating the operation status of the original treatment facilities and absorbing the latest research results at home and abroad,combining with the experimental results of small-scale experiments,the design parameters are adjusted to complete the actual project of treatinghigh-nitrogen wastewater from photovoltaic industry and reusing it by technological transformation of the original facilities.Aim To determine the technological route and design the project,and verify the design effect of the project through the actual operation results and operation data.The main research results include:(1)The current situation of a municipal wastewater treatment plant,pretreatment facilities for copper-containing wastewater and dilute nitrogen wastewater from photovoltaic enterprises is analyzed.Through mastering the technological process of the original facilities,the quality of the water in and out,and the operating conditions,the operation effect is evaluated,and the existing problems in the current operation are analyzed and studied,which provides the most precise reference basis for the project design.(2)The pretreatment facility of copper-containing wastewater is anaerobic+aerobic+flocculating sedimentation process.The nitrate nitrogen and ammonia nitrogen in the influent of photovoltaic dilute nitrogen wastewater are greatly increased after it is connected,and the effluent quality index should be consistent with the original one.Therefore,combined with the change of the quality of the designed inlet and outlet water,the project carries out the revamping on the basis of the existing structure of the copper-containing pretreatment facility,increases the denitrification filler density in the combined pool,adds sodium acetate as the denitrification carbon source,adds the corresponding structure and adds the carbon source adding system to increase the denitrification carbon source.Sludge age,reduce sludge load and improve biochemical treatment capacity.Combining with the latest technological achievements at home and abroad,and combined with the results of small-scale experiments,the technological transformation scheme of pretreatment facilities for copper-containing wastewater is put forward.(3)In order to meet the requirement of reclaimed water utilization in photovoltaic enterprises,the advanced treatment process of municipal wastewater treatment plant was optimized,and a new pump house for reclaimed water reuse and two-way pipeline transportation system were built.Through hydraulic calculation and pipe material selection,combined with geological prospecting report and planning of pipe position,the design scheme of pump house and water pipeline for reclaimed water reuse has been completed.(4)After determining the process plan,the relationship between design parameters and treatment effect is analyzed comprehensively.According to the analysis results of existing facilities,the parameters are optimized,and the process design of single structure,material selection of main equipment,process elevation design and overall layout design are carried out to complete the project design.(5)Completed the design guidance and process debugging guidance during the construction of the project to ensure that the project is completed and put into operation in accordance with the design requirements.After process debugging,the project has been put into trial operation,the facility runs smoothly,the treatment effect and effluent quality meet the design requirements,and the project has achieved its due performance.The design of this project involves the research on the treatment technology of high nitrogen wastewater by fixed-bed contact oxidation process,the demonstration of the original filtration and disinfection facilities,the demonstration of the treatment effect of the original copper-containing wastewater,the design of the intermediate water pump house and the water supply and drainage pipeline,the connection between the new facilities and the constructed facilities,etc.It is complex,innovative and challenging.It can well test and exercise their own theory and practice and engineering design practice level.