Biological aerated filter remedy of coking wastewater-BAF, BAF, coking wastewater – drinking water industr

Write-up by hi joiney

Overview Coking wastewater is a higher COD large phenol appeal higher ammonia treatment of challenging industrial organic wastewater Given that the 80s of the 20th century a lot more than the domestic coking wastewater by two biochemical approaches extended aeration approach powerful biochemical approaches this sort of as biological iron biological activated carbon and other approaches in which A O approach anaerobic 1 aerobic activated sludge treatment method was greatest but the A O technique greater first expense and working fees 1m3 of water costs about 7 four yuan to offer right with the basic coking enterprises unbearable BAF BiologicalAeratedFilter referred to as BAF is the get in touch with with oxygen in biological Chemical industry Artwork based on the introduction of drinking h2o treatment filter suggestions emerged as an aerobic Membrane Therapy Engineering The simple principle is the principal treatment is based on the primary remedy with granular Filler The growth of biofilm and its attachment to deal with media give total perform to the position of microbial metabolic rate the function of bodily filtration membrane and fill the position of the bodily Absorption and bio reactor multi stage predation in the same unit of pollutant elimination reactor The process has large volumetric loading hydraulic loading huge hydraulic retention time is quick great effluent quality little size significantly less expense in infrastructure power usage and running costs very low This examine will analyze the software of coking wastewater treatment method refractory feasibility of powerful therapy of coking wastewater to seek new techniques one check approaches and products Drinking water sources and drinking water quality one one Test wastewater from Ma On Shan Steel Company coking plant the h2o high quality refers to Table one Table 1 Coking Wastewater Top quality one 2 Experimental Supplies BAF reactors create cylindrical plexiglass column substantial 1 55m diameter 11m volume 14 7L built eight 7L Lytag Filter Media Filter storey one 1m Way to the stream utilizing h2o bottom water plates long handled h2o filter head cloth the upper drainage sintered sand core aeration YL 888 form gasoline Pump 2 BTOO a SOM based mostly present pump h2o Lytag filter parameters diameter of 3 to 5mm the packing density of 89g cm3 broken fee of 07 specific surface area of four 8m2 g porosity 35 the dress in price of 5 three hydrochloric acid soluble rate of five BAF construction indicated in Figure one 1 3 approach and check approaches 1 three 1 Approach Check process shown in Figure two Coking wastewater sedimentation tank by adjusting the pump by the continuous injection of BAF bottom of the skillet soon after the very first filter into the filter layer At the identical time from the pump to the filter layer aeration the water after backwashing pool storage pool efflux Backwash time intervals combined with air and h2o backwash Is first gas recoil 5min and then begin the water pump air and water backwash at the identical time 5min the closing h2o rinse 5 8min Backwash water with reactor ie Figure 2 backwash pool Backwash off the biofilm sludge and other impurities with the backwash h2o back again to the regulator sedimentation tanks sedimentation basins sludge efflux by the set one 3 two operating parameters Air to drinking water ratio of 5 to 1 backwash routine seven 8d the joint air and drinking water backwash air water backwashing strength was five one 8sL s m2 anti washing time of fifteen a 18min hydraulic load 1 05 two 5rn3 m2 h 1 three three H2o Sampling Approach Every 1h respectively and in regulating the sedimentation pool backwash 2 times the sampling sample h2o 200mL and mix the different h2o samples by mixing the sample population sample a total of 6 instances 1200mL this can be as considerably as possible eliminate or avoid a sampling error due to opportunity sampling spot surface area Department beneath 3cm one 4BAF culture biofilm BAF biofilm way of life method with continuous feeding Simple operation is Maanshan Iron amp Steel coke plant will be taken from activated sludge wastewater therapy plant after proper stirring constantly incorporating Taomi Shui including aeration reactor and make steady progress Taomi Shui three days following the cessation of sludge raises drinking water use diluted white inflow of reduced coking wastewater and adding a tiny sum of potassium hydrogen phosphate to enhance phosphorus ranges in wastewater control the reactor mixture was alkaline after twenty days on the progress of the thin filter filter a layer of biofilm Microscopic examination of biofilms below the microscope off the benefits proven in Figure three Figure 4 reveals that the biofilm has many ciliates protozoa such as Paramecium roaming insects beetles and other beans The guidelines of the development of mature biofilm protozoa marks Meanwhile reactor wastewater COD removing efficiency of 70 at this time that the good results of biofilm tradition can be check situations 1 5 Drinking water High quality Analysis Water top quality evaluation strategy primarily based on quot H2o and Wastewater Monitoring Evaluation Technique quot 4th version CODCr was measured with potassium dichromate ammonia was decided by distillation of a Nessler 39 Sreagent pH measured by electrode method phenol was established by four amino antipyrine a immediate method cyanide with isonicotinic acid Spectrophotometric a border wow 2 Final results and Analysis two one hydraulic load and the relationship among the removing of COD Hydraulic load is immediately connected to the size of Sewage In the reactor and provider biofilm contact time The more compact the value of water and the biofilm response time more time the far better CODCr influent focus of 820mg L when BAF underneath various hydraulic loading CODcr coking wastewater elimination result revealed in Figure five BAF can be seen from Figure 5 on the coking wastewater with large natural make a difference removal when the hydraulic load is 05 of a 2m3 m2 quot h time COD Elimination rate attained 90 and the h2o concentration of about CODcr to 220mg L to GB13456 92 nationwide secondary emission expectations two 2 phenol cyanide removing BAF on the coking wastewater phenol cyanide removing in Table two As can be noticed from Table two when the average hydraulic loading 12m3 m2 h time BAF phenol wastewater average removal rates of cyanide up to 980 and 96 and water to the GB13456 92 countries one emission requirements Figure 6BaF 39 on the coking wastewater removal of NH3 N 2 three Elimination of ammonia nitrogen Influent NH3 N was 160mg L when BAF beneath different hydraulic loading on the coking wastewater removing efficiency of NH3 N shown in Figure six Can be witnessed from Figure six BAF coking wastewater removal of NH3 N less effective when the hydraulic loading of 1m3 m2 h time BAF on NH3 N removal effectiveness is only forty five Meanwhile with the hydraulic load development the removal price decreases when the hydraulic load to 25m3 m2 h the effluent concentrations than influent concentration relatively large Generally due to Reactor CODCr NHS N concentration was higher inhibited the metabolic process of nitrifying bacteria in wastewater and with the decomposition of nitrogenous natural and organic make a difference resulting in effluent NH3 N focus 3 Conclusion

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