A kind of processing method of isatin wastewater
A treatment method and wastewater technology, which is applied in energy wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of ineffective effect, complicated operation, high technical cost, etc., and reduce the difficulty of treatment , The process is simple, the effect of reducing costs
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Embodiment 1
[0041] A certain isatin wastewater is black and red, the COD is about 18080mg / L, and the acidity (in terms of H 2 SO 4 Total) is 37%. Use liquid ammonia to adjust the pH of the wastewater to 5, add 1% ferrous sulfate and 2% hydrogen peroxide (based on the mass of isatin wastewater) in a mass percentage, keep warm at 55°C and stir for 1 hour, adjust the pH of the solution to 8 with ammonia water, and then add Activated carbon with a mass percentage of 0.1% was stirred and adsorbed for 0.5h, and the COD of the filtrate I was filtered to be about 9906mg / L; after the filtrate I was adsorbed by the macroporous resin of the model HYA106, the COD of the column liquid was about 4580mg / L; Pass ClO into the column solution 2 Oxidize for 0.5h, keep ClO in solution 2 The concentration is 1000mg / L (based on the volume of the column liquid), and the pH value is kept at about 8 during the oxidation process to obtain an orange solution. The COD of the solution is about 923mg / L; then add 0....
Embodiment 2
[0060] A certain isatin wastewater is dark red, COD is about 12000mg / L, acidity (in terms of H 2 SO 4 Total) is 32%. Use ammonia water to adjust the pH of the wastewater to 6, based on the mass of isatin wastewater, add 0.5% activated carbon by mass percentage, stir and adsorb for 0.5h, then filter to obtain wine red filtrate I; pass 1000mg / L ClO into filtrate I 2 After oxidizing for 0.5h, an orange solution was obtained, and the COD of the solution was about 4000mg / L; then 0.4% activated carbon was added to stir and adsorb for 0.5h, and filtered to obtain light yellow filtrate II. Distill this filtrate II under reduced pressure to obtain condensed water COD=114mg / L, NH 3 -N=43.2mg / L, the quality of the ammonium sulfate obtained by concentration reaches the GB535-1995 standard, and the dry nitrogen content is 20.61%.
Embodiment 3
[0062] A certain isatin wastewater is orange-red, with a COD of about 8000mg / L, which is strongly acidic. Adjust the pH of the solution to 5 with ammonia water, heat and control the temperature at 50°C, and add FeSO 4 with H 2 o 2 After stirring and reacting for 1 h, flocculate and filter; the resulting filtrate was passed through ClO 2 (ventilation rate is 1000mg / L), react for 30min, the COD of the solution obtained after the reaction is about 3000mg / L; add 0.1% diatomaceous earth to obtain light yellow solution after adsorption. Adjust the pH of the solution to about 5, and distill under reduced pressure to obtain condensed water COD=84mg / L, NH 3 -N=11.2mg / L, the quality of the ammonium sulfate obtained by concentration reaches the GB535-1995 standard, and the dry nitrogen content is 20.90%.
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