Caffeine wastewater purification treatment process
A caffeine and wastewater technology, which is applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of high treatment cost, cumbersome operation and management, and poor treatment effect, and achieve the goal of treatment The effect is good, the removal rate is improved, and the treatment process is simple.
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Embodiment 1
[0024] The wastewater produced by the caffeine production process has a pH of 3.8, COD=43200mg / L, TOC (total organic carbon)=21420mg / L.
[0025] (1) Wet oxidation: Based on the quality of the water phase, add 0.5% copper sulfate pentahydrate as a catalyst to the waste water to carry out wet oxidation. The reaction temperature was set at 220°C, pure oxygen was introduced, and the pressure was 1Mpa, and the reaction was carried out for 1 hour. The COD of the wet oxidation effluent is 15320mg / L, the TOC is 7600mg / L, and the effluent is passed through HYC-100 amino carboxylic acid chelating resin to recover the catalyst to obtain the treatment liquid.
[0026] (2) Photooxidation: adjust the pH of the treatment solution processed through step (1) with dilute sulfuric acid to be 3, place it under a mercury lamp of 300w and stir it for 4h, and simultaneously use a pump to import hydrogen peroxide in the waste water. The total amount of hydrogen peroxide added is 8%. The COD of the ...
Embodiment 2
[0029] The wastewater produced by the caffeine production process has a pH of 3.8, COD=43200mg / L, TOC (total organic carbon)=21420mg / L.
[0030] (1) Wet oxidation: Based on the quality of the water phase, add 0.5% manganese sulfate and cobalt sulfate as catalysts to the waste water to carry out wet oxidation. The reaction temperature was set at 240°C, pure oxygen was introduced, and the initial pressure was 1.2Mpa, and the reaction was carried out for 1 hour. The COD of the wet oxidation effluent is 13280mg / L, the TOC is 6560mg / L, and the catalyst is recovered with HYC-100 amino carboxylic acid chelating resin.
[0031] (2) Photooxidation: adjust the pH of the filtrate treated in step (1) with hydrochloric acid to be 4, place it under a 400w mercury lamp and stir for 3 hours, and simultaneously use a pump to import hydrogen peroxide into the waste water, and the total amount of hydrogen peroxide added is 9%. . The COD of the photooxidized water is 1648mg / L, and the TOC is 75...
Embodiment 3
[0034] The wastewater produced by the caffeine production process has a pH of 3.8, COD=43200mg / L, TOC (total organic carbon)=21420mg / L.
[0035] (1) Wet oxidation: Based on the quality of the water phase, 0.3% of a mixture of copper sulfate pentahydrate, manganese sulfate and cobalt sulfate is added to the waste water as a catalyst for wet oxidation. The reaction temperature was set at 230°C, pure oxygen was introduced, the initial pressure was 1Mpa, and the reaction was carried out for 1.5 hours. The COD of wet oxidation effluent is 14218mg / L, TOC is 7320mg / L, and the catalyst is recovered with HYC-100 amino carboxylic acid chelating resin.
[0036] (2) Photooxidation: adjust the pH of the filtrate processed through step (1) with dilute sulfuric acid to be 5, place the stirring reaction under the mercury lamp of 500w for 3.5h, and import hydrogen peroxide in the waste water with a pump simultaneously, the total addition of hydrogen peroxide is 7%. The COD of the photooxidiz...
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