Analysis Of Efficiency And Ability Of Upgrading Project And Optimizing Of Technology For Tuandao Wastewater Treatment Plant

With the high-speed development of economic,national and local environmentalprotection to water become continuous improved,the corresponding pollutantsstandards for discharge of water are more strictly, so most of our urban sewagetreatment plant face a severe upgraded requirements. All of the shandong peninsulaurban sewage treatment plants must reach 《Discharge standard of pollutants formunicipal wastewater treatment plant》(GB18918-2002) standard. Government ofqingdao city requires all the sewage treatment plant effluent water which directly orindirectly row to jiaozhou bay should achieve A level A standard. Therefore, theQingdao TuanDao sewage treatment plant was upgraded. Main biochemical reaction unitimproved A2O process to MBBR process. and increases advanced treatment to furtherimprove the effluent water quality.This subject is based on researching of upgrading project facilities conditions ofQingdao TuanDao sewage treatment plant. By studying and analyzing the overallrunning effect before and after the upgrading project and the main biochemical reactionunit in different operation stages or working conditions, the evaluation and analysis ofthe sewage treatment plant upgrading project facilities and processing capability can bedone.The conclusions can be induced:1. Research of efficiency and ability of upgrading project.After the upgrading project,the biomass on the bio-carrier of the MBBR systembecame increase and stability, microbial population on the bio-carrier increasedgradually. Whether in normal temperature or low temperature adverse conditions,theMBBR system was better than ordinary activated sludge system in the respect ofremoval efficiency of organic, nitrogen and phosphorus. Especially, removal ofammonia nitrogen and total nitrogen was more obvious. Nitrogen remove efficiencywas improved greatly. Based on the study of transform rule of nitrogen and phosphorusin MBBR system at different operating conditions,this work separately studied the factors of the low load in rainy season, reflux ratio and sludge concentration (includingsuspended sludge and biological film), dissolved oxygen and temperature whichinfluence the effects of running. Then, the guiding opinions of management operationwere put forward.2. Optimization of biochemical treatment unit research.Based on the static process test, Whether at normal temperature and lowtemperature adverse conditions,the nitrification ability of MBBR system is strongerthan ordinary activated sludge system, especially at low temperature adverseconditions. Through the static process about filling rate at15%,30%and45%whichinfluence MBBR system nitrification ability, the best filling rate was30%. Throughthe static process about DO at2±0.5mg/L,3±0.5mg/L and4±0.5mg/L whichinfluence MBBR system nitrification ability, the DO was3mg/L. Through the staticprocess about denitrifying ability of the MBBR system and common activated sludgesystem, MBBR system represented strong denitrification function in the whole processof reaction. Through the static process about the influences of dosing carbon sources tothe system denitrification function, carbon source system showed a greater denitrifyingability in the whole reaction process, denitrifying rate increased by33%.3. Optimization of advanced treatment coagulation researchThe secondary effluent of Tuandao wasterwater treatment plant was for the study,the research investigated separately the effect of coagulants kind, dosage andcoagulation time. Based on coagulation experiments,the optimum dosage of the fourcoagulants PAC,1#Fe,2#Fe,Fecl3were20mg/L,10mg/L,10mg/L and10mg/L.Basedon three factors and four levels orthogonal experiment, the conclusion was: The besttype of coagulant was2#Fe; optimum coagulant dosage(Fe3+was for the measure) was20mg/L; The best coagulation time was10min.