| It gradually has become one of the main ways for wasterwater reclamation andreuse to sovle the problem of water shortages.Disinfection is the key link ofwastewater reclamation and reuse,playing an important role in the public security ofreclaimed water utilization system. There are many kinds of wastewater regenerationdisinfection process and dosing quantity of disinfectants is usually determined as amatter of experience since there is no concrete scientific guidance.It is so importantlytheoretical and practical significance for improving the water quality of reclaimedwater and ensure the safety of reclaimed water for different water quality.Thisdisinfection process should be better sterilization effect,less produced disinfectionby-products,less ecological risk.The objective was to study the wastewater regeneration disinfection technologybased on the separate disinfection of sodium hypochlorite,ultraviolet,ozone widelyused in wastewater regeneration process and different kinds of combinationdisinfection.It was mainly to investigate the disinfection effect by differentdisinfection modes to disinfect stan filtration effluent,MBR effluent,UF effluent.Thispaper researches the conventional physical and chemical indicators,themicrobiological indicators,the disinfection by-products,the three-dimensionalfluorescence spectroscopy and trace organic compounds analysis to put forward thebest disinfection technology for different treatment effluent takingeconomic,technology,security into account.According to this study,the mainconclusions are as follows:Combination of ozonation and chlorination process is suitable for disinfection ofsand filtration effluent.The combination of ozonation (at a ozone dose of6mg/L) andchlorination (at a available chlorine dose of5mg/L) led to an increased removal oftotal number of bacteria of fecal coliforms of3CFU/L,which meets the standard of theReuse of Urban Recycling Water-Water Quality Stadard for Scenic Enviroment Use(GB/T18921-2002).The trihalomethanes(THMs) has increased to17.35g/L,while itwas reduced78.08%by using the combination of ozonation and chlorination,whichcould greatly reduce the ecological security risk compared with chlorine alone.It is good removal effect on microorganism for MBR effluent using any kind ofsodium hypochlorite,ultraviolet,ozone alone.Under the condition of this test,it hadbetter usecombination of ultraviolet and chlorination process or combination ofozonation and chlorination process that could greatly improve the level of microbialremoval.The total coliform bacteria after disinfection of two kinds of combinationcould meet the requirement of Reuse of Urban Recycling Water-Water Quality,astandard for Urban Miscellaneous Water Consumption(GB/T18920-2002).The ecological security risk has been greatly reduced by using combination of ozonationandchlorination process.The water of UF effluent has good water quality,microbial content of which isless.It is good removal effect on microorganism no matter use any way of sodiumhypochlorite,ultraviolet,ozone alone or use combination of ultraviolet and chlorinationprocess or combination of ozonation and chlorination process.Under the condition ofthis test,it had better use sodium hypochlorite alone.The total coliform bacteria afterdisinfection could meet the requirement of Reuse of Urban Recycling Water-WaterQuality, a standard for Urban Miscellaneous Water Consumption(GB/T18920-2002)at a available chlorine dose of4mg/L.The trihalomethanes(THMs) has increased to38.2g/L,which is lower than limit of drinking water standard. |
