Treatment method of dye washing wastewater
A treatment method and wastewater technology, applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of high treatment costs, large solid waste, etc., to reduce COD and reduce treatment Cost, the effect of reducing the generation of solid waste
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Embodiment 1
[0025] (1) Put 6000g of washing wastewater into the container, add 5g of activated carbon, start stirring, keep warm at 50°C for 30min, then filter, collect the filtrate, put in lime while stirring, stop adding lime after the pH reaches 5, and add lime all the time The amount is 50.8g, then keep stirring for 30 minutes, filter, and discharge the filtrate after biochemical treatment. The filter residue is mainly calcium sulfate solid, which is washed with a small amount of water and dried. The quality of the filter residue is 97.3g.
[0026] (2) Add 400mL of clear water and 60g of soda ash to another beaker, stir to dissolve, start to slowly add the above filter residue, after throwing in, continue to stir for 15min, test the pH value, add soda ash until the pH is 9, stir for 30min, and suction filter, The filter residue is calcium carbonate, the filtrate is sodium sulfate solution, and its COD is about 100mg / L, which is directly discharged or absorbed by 1‰ activated carbon to...
Embodiment 2～20
[0028] (1) 6000g washing water is placed in the container, add activated carbon 5g, open and stir, keep warm for 30min, then filter, the filtrate is collected, drop into all the calcium carbonate filter residues that last embodiment produces under the stirring situation, throw in and finish, add lime Stir for 30 minutes until the pH is 5, filter, and discharge the filtrate after biochemical treatment. The filter residue was washed once with a small amount of reclaimed water (the reclaimed water here is reclaimed water with a COD of about 100 after the biochemical effluent was treated by the Fenton method), dried and collected.
[0029] (2) Add 400mL of clear water and 60g of soda ash to another beaker, stir to dissolve, start to slowly add the above filter residue, after throwing in, continue to stir for 15min, test the pH value, add soda ash until the pH is 9, stir for 30min, and suction filter, The filter residue is calcium carbonate, the filtrate is sodium sulfate solution,...
Embodiment 21
[0036] (1) Heat 100 tons of washing water with an acidity of 1% to about 50°C, absorb it through an activated carbon adsorption tower, then transfer it to a neutralization pot, slowly add slaked lime under stirring conditions, adjust the pH to 5, and then stop. Use a pump to beat the material to the filter press for filtration, and wash it once with reclaimed water (the reclaimed water here is reclaimed water with a COD of about 100 after the biochemical discharge water is treated by the Fenton method), and the filtrate is discharged after biochemical treatment. The filter cake is dried to obtain about 3000 kg of calcium sulfate filter cake with a solid content of about 50%.
[0037] (2) Add 8-10 tons of bottom water and 1000kg of soda ash to the reaction pot, start stirring, slowly put the dismantled calcium sulfate into the reaction pot, add soda ash according to the situation after the casting, make the pH of the material reach 9, stop, and stir half an hour. Into the filt...
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