| Distribution of rural sewage is widely and dispersion, multiple sources, strongrandomness, large range of changes, difficult of prevention and treatment. In recent years,with the rapid development of rural economy, increasingly concentrated of rural residentialareas, sewage emissions will continue to increase, but due to the shortage of funds in ruralareas, construction and operation of appropriate wastewater treatment facilities lags far behindthe needs of the developing situation. Based on the current situation of water pollution in ruralareas, high efficiency, low consumption, energy saving, strong adaptability and easymanagement of sewage treatment process has become a hot research. This paper study therunning effect of grid flocculation technology, vortex flocculation technology and vortex-gridflocculation technology treatment of sewage, to vortex-grid flocculation technology for theapplication of treatment of sewage in rural or remote areas project provide design parameterssupport and basis of popularization and application.In this paper, the experiment coagulation was selected through the static test, then studydifferent flocculation technologies treatment flocculation effect and removal effect of sewage.Test results are as follows:1. Through the coagulation effects and properties of PAC, FeCl3, Al2(SO4)3, PAC was theoptimized by static experiment2. When influent flow rate of the device was5m3/h (flocculation time was17.1min),with the increased of PAC dosage, effluent turbidity of inclined tube sedimentation devicepresented first decreased and then increased; the ξ potential of effluent inclined tubesedimentation device also with the increase of PAC dosage gradually increased; when taking astep forward flocculant dosage increased, effluent ξ potential from negative to positive,effluent turbidity of inclined tube sedimentation device was also on the rise. Floc size fromtransition zone of inclined tube sedimentation device increased at first and then decreased.3. While best dosage of flocculant was40mg/L, sewage treatment by grid flocculationtechnology, different influent flow of1,2,3,4,5,6m3/h, range of influent turbidity, COD,NH3-N, TP was10.71～11.74NTU,147～165mg/L,13～19mg/L,1.93～2.17mg/L, undervarious flow rate range of effluent turbidity, COD, NH3-N, TP was3.14～4.16NTU,80～91mg/L,11～17mg/L, below0.65mg/L, removal of turbidity, COD, NH3-N, TP was68%,45%,10%, about73%. Flocculation time was17.1min (influent flow of5m3/h), the effluentof turbidity, COD, NH3-N, TP was lowest, of3.14NTU,80.64mg/L,11.9mg/L,0.4966mg/L, removal rate of turbidity, COD, NH3-N, TP reached72%,48%,13.8%,77%.4. While best dosage of flocculant was35mg/L, sewage treatment by vortex flocculationtechnology, different influent flow of1,2,3,4,5,6m3/h, range of influent turbidity, COD,NH3-N, TP was13.44～15.87NTU,140～171mg/L,18～24mg/L,2.20～2.86mg/L, undervarious flow rate range of effluent turbidity, COD, NH3-N, TP was3.31～4.28NTU,63～84mg/L,15～20mg/L, below0.65mg/L, removal of turbidity, COD, NH3-N, TP was74%,53%,13%, about79%. Flocculation time was17.1min (influent flow of5m3/h), the effluentof turbidity, COD, NH3-N, TP was lowest, of3.31NTU,63.76mg/L,15.71mg/L,0.430mg/L.removal rate of turbidity, COD, NH3-N, TP reached79%,55%,15.10%,81.45%.5. While best dosage of flocculant was25mg/L, sewage treatment by vortex-gridflocculation technology, different influent flow of1,2,3,4,5,6m3/h, range of influentturbidity, COD, NH3-N, TP was14.98～16.84NTU,151～185mg/L,22～25mg/L,2.10～3.11mg/L, under various flow rate range of effluent turbidity, COD, NH3-N, TP was3.21～4.08NTU,50～71mg/L,17～21mg/L, below0.60mg/L, removal of turbidity, COD, NH3-N,TP was77%,62%,19%, about80%. Flocculation time was17.1min (influent flow of5m3/h),the effluent of turbidity, COD, NH3-N, TP was lowest, of3.21NTU,50.36mg/L,17.52mg/L,0.401mg/L, removal rate of turbidity, COD, NH3-N, TP reached80%,68%,22%,82.6%.6. When reached the same turbidity of effluent, flocculant consumption of vortex-gridflocculation technology was significantly lower than the grid flocculation technology andvortex flocculation technology, flocculant consumption was reduced by37.5%whencomparing the treatment of domestic sewage by grid flocculation technology, flocculantconsumption was reduced by28.6%when comparing the treatment of domestic sewage byvortex flocculation technology.7. Optimal conditions, engineering application into the rural areas of sewage emissions at2000m3/d under the combined use of vortex-grid flocculation technology, the running costsof sewage production is0.099yuan/m3.8. Flocculation effect of vortex-grid flocculation technology is higher than vortexflocculation technology and grid technology, strong resistance to impact load, low cost ofoperation, easy management, etc. The technique for improving effluent quality of wastewatertreatment engineering, reducing the load of subsequent processing or pressure ofcontamination water, promote the development of flocculation theory and technology of greatsignificance, and will have a large application prospects. |
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