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Method for treating saccharin wastewater

A treatment method and wastewater technology, which can be used in water/sewage treatment, natural water treatment, flotation water/sewage treatment, etc., and can solve problems such as failure to meet secondary discharge standards and poor effect.

Inactive Publication Date: 2012-01-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem that the existing direct biochemical method for treating saccharin wastewater has poor effect of removing inorganic salts and cannot meet the secondary discharge standard of GB8978-96 "Comprehensive Wastewater Discharge Standard", and provides a treatment method for saccharin wastewater

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specific Embodiment approach 1

[0007] Embodiment 1: The treatment method of saccharin wastewater according to the present embodiment is carried out according to the following steps: 1. Add saccharin wastewater to a reactor equipped with a mixture of iron filings and activated carbon, and then press wastewater: hydrogen peroxide = 1: 0.1~ Add hydrogen peroxide at a volume ratio of 0.5, and adjust Fe 2+ The concentration is 50mg / L~200mg / L, the pH value is 4~5, and the hydraulic retention time is 2.0h~3.5h; 2. The effluent treated in step 1 flows into the first sedimentation tank for sedimentation treatment; The supernatant obtained after the treatment in step 2 flows into the hydrolysis multifunctional pool, and the concentration of anaerobic activated sludge in the hydrolysis multifunctional pool is 10kg / m 3 ~20kg / m 3 , the dissolved oxygen content is 0.1mg / L~0.3mg / L, the pH value is 4~5, and the hydraulic retention time is 10h~14h; 4. The supernatant obtained after the treatment in step 3 flows into the up...

specific Embodiment approach 2

[0009] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, hydrogen peroxide is added according to the volume ratio of waste water: hydrogen peroxide = 1:0.2~0.4, and the Fe 2+ The concentration is 60mg / L~180mg / L, the pH value is 4.2~4.8, and the hydraulic retention time is 2.2h~3.3h. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0010] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step one, add hydrogen peroxide according to the volume ratio of waste water: hydrogen peroxide = 1:0.3, and adjust Fe 2+ The concentration is 100mg / L, the pH value is 4.5, and the hydraulic retention time is 2.8h. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for treating saccharin wastewater, and relates to a method for treating wastewater. The method solves the problems that the existing method for treating the saccharin wastewater by an immediate biochemical method has poor effect of removing inorganic salt, and cannot meet the secondary discharge standard of Integrated Wastewater Discharge Standard. One method comprises the following steps: pretreating the saccharin wastewater by iron-carbon and Fenton; and sequentially treating the wastwater in a primary sedimentation tank, a hydrolysis multifunctional tank, anupflow anaerobic sludge blanket reactor and a biological contact oxidation pond, then carrying out secondary sedimentation on the wastewater, and finally draining the treated wastewater. The other method comprises the following steps: treating the saccharin wastewater in the first sedimentation tank, the hydrolysis multifunctional tank, the upflow anaerobic sludge blanket reactor and the biological contact oxidation pond in turns after the saccharin wastewater is subjected to iron-carbon and Fenton pre-treatment, and then carrying out sedimentating and flotating the wastewater. After the saccharin wastewater is treated by the method, the saccharin wastewater can achieve primary or secondary discharge standard, the Cu2<+> removal rate is between 98 to 99.8 percent, and the method can be used for treating wastewater.

Description

technical field [0001] The invention relates to a method for treating waste water. Background technique [0002] Sodium saccharin (sodium o-formylbenzenesulfonylimide) is a commonly used food additive and electroplating brightener, which is widely used in daily life, food processing and industrial production. The main chemical raw materials for the production of sodium saccharin are phthalic anhydride, liquid ammonia, methanol, sodium hypochlorite, copper sulfate, sodium bicarbonate, etc. The preparation process is to amidate and esterify phthalic anhydride to make methyl o-carbamate, and After diazonium, replacement, and chlorination, it is aminated and cyclized to make saccharin, and finally sodium bicarbonate is added to make sodium saccharin through crystallization and drying. Saccharin sodium production wastewater mainly comes from methyl ester mother liquor, toluene raffinate, alkali (ammonia water), acid, Cu 2+ wait. Due to the variety of raw materials and complex ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/461C02F1/72C02F3/28C02F1/24C02F1/52C02F103/36
Inventor 邱珊徐善文魏利马放周浩黄金杨基先
Owner HARBIN INST OF TECH
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