A kind of phthalic anhydride method saccharin sodium production wastewater treatment method
A technology for the production of wastewater and treatment methods, which is applied in natural water treatment, multi-stage water treatment, water/sewage treatment, etc. It can solve the problems of increasing wastewater treatment costs, affecting applications, and poor biodegradability. Solve the problem of treatment, the effect of low secondary pollution
Active Publication Date: 2020-11-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
Sodium saccharin production wastewater has poor biodegradability (BOD 5 / COD Cr ≈0), cannot be treated with traditional biochemical methods; Harbin Institute of Technology disclosed a treatment method for saccharin sodium wastewater in 201010130184.5, in order to solve the problem of poor biodegradability of wastewater, iron carbon plus Fenton method is used for pretreatment, However, the disadvantage of this technology is that a large amount of iron sludge will be produced during the wastewater treatment process, and the iron sludge that absorbs a large amount of organic matter is defined as hazardous solid waste by the current environmental protection law, and the treatment cost is about 3,000-4,000 yuan / ton, which greatly increases the waste water. processing cost
[0004] As can be seen from the prior art described above, there are many defects in it, which seriously affects the application of these technologies in the treatment of saccharin sodium production wastewater
Method used
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Embodiment 1
[0025] The catalyst used in the reaction tower of catalytic wet oxidation system is Ru-Pd-Sn-Ce / γ-Al 2 o 3 , the contents of active components Ru and Pd are 1.0wt.% and 0.5wt.%, the contents of Sn and Ce are 0.5wt.% and 1.5wt.% respectively; the loading capacity is 2.5m 3 .
[0026] Firstly, the waste water from the production of sodium saccharin is neutralized with ammonia gas in the neutralization system, and the pH is adjusted to 7; then the methanol in the waste water is recovered in the distillation system, and the distillation temperature is 45°C; secondly, the methanol in the waste water is recovered through the three-effect evaporation system Copper and ammonium sulfate; the effluent of the three-effect evaporation system is pretreated and stored in the waste liquid storage tank. The waste water from the waste liquid storage tank is filtered through the bag filter, and then passed through the waste water metering pump and the air from the air compressor unit. Mix in ...
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The invention relates to a method for treating wastewater produced by phthalic anhydride-based sodium saccharin, and belongs to the field of treating high-concentration refractory organic wastewater. The technology includes five operating units: neutralization system, distillation system, multi-effect evaporation system, catalytic wet oxidation system and biological oxidation system. The method for treating wastewater produced by phthalic anhydride-based sodium saccharin production involved in the present invention has the advantages of simple process flow, high treatment efficiency, small footprint, recyclable resources, low secondary pollution, and the like. The method can make the effluent COD of the sodium saccharin production wastewater less than 40mg / L, reaching the national first-class discharge standard. The application of this method can successfully solve the problem of wastewater treatment in sodium saccharin production enterprises.
Description
technical field [0001] The invention relates to a treatment method for saccharin sodium production wastewater by a phthalic anhydride method. The method can make the saccharin sodium wastewater reach the standard discharge, and belongs to the field of high-concentration refractory organic wastewater treatment. Background technique [0002] Sodium saccharin, also known as sodium o-sulfonylbenzimide, was developed in 1879 and is the earliest synthetic non-nutritive sweetener. It is used as a sugar substitute by patients with obesity, hyperlipidemia, diabetes and dental caries because of its low calorie, no absorption by the human body, and automatic excretion with urine and urine. In addition, it can also be used as a brightening agent for nickel-chromium plating, a blood circulation measuring agent, a penetrating agent, etc., and has a wide range of uses. There are many production processes for sodium saccharin, which can be divided into toluene method, phthalic anhydride me...
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IPC IPC(8): C02F9/14
CPCC02F1/001C02F1/048C02F1/66C02F3/02C02F9/00C02F2101/16C02F2101/20C02F2101/34C02F2101/38C02F2103/36C02F2301/08
Inventor 卫皇曌孙承林于杨王亚旻李敬美孙文静
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI