Fatty alcohol polyoxyethylene ether sodium sulfate wastewater treatment process

Sodium fatty alcohol polyoxyethylene ether sulfate is easily soluble in water, has excellent decontamination, emulsifying, foaming, and anti-hard water properties, and mild washing properties will not damage the skin. Widely used in shampoo, bath liquid, dishwashing detergent, compound soap, and other washing and cosmetic products. Wastewater will be produced in the process of producing fatty alcohol polyoxyethylene ether sodium sulfate. After biochemical treatment, it can generally reach the national secondary discharge standard. However, due to the shortage of water resources, the water that meets the discharge standard needs to be recycled after further advanced treatment to meet the requirements of industrial water replenishment. The dioxane content in the fatty alcohol polyoxyethylene ether sodium sulfate wastewater is relatively high, which cannot meet the requirements for recycling.

To this end, we propose a wastewater treatment process of fatty alcohol polyoxyethylene ether sodium sulfate, which reduces the content of dioxane.

  • Precipitation and impurity removal, the waste water of fatty alcohol polyoxyethylene ether sodium sulfate is collected, physically precipitated and filtered in order to remove floating impurities, separate the sediment at the bottom layer, and obtain clarified waste water.
  • Filtration and separation, the activated sludge and macromolecular organic substances in the biochemical reaction tank are intercepted by membrane separation equipment, and clean water is separated to realize the simultaneous biochemical reaction and clean water separation.
  • In the first adsorption, the filtered and separated wastewater is transferred to the adsorption tank through the pipeline, and the anion and cation resin adsorption equipment is connected to the pipeline. In the process of wastewater transfer, the anion and cation resin adsorption equipment is used to adsorb dioxane and active components in the wastewater.
  • For secondary adsorption, put activated carbon particles into the adsorption tank, the mass ratio of activated carbon particles to wastewater is 0.5-2:100, fully stir, and use activated carbon for adsorption to remove dioxane and active components in wastewater twice.
  • The particle size of the ion exchange resin of the anion and cation resin adsorption equipment is set to 24-35 mesh, and the ion exchange resin is dried, pulverized and sieved (wedge wire mesh) before use.

The ion exchange resin of the anion and cation resin adsorption equipment needs to be pretreated before use.

  • Treat with 20 times the resin volume of 4% aqueous sodium hydroxide.
  • Then wash with 10 times the volume of water.
  • Then treated with 10 times the amount of 4% hydrochloric acid.
  • Wash with distilled water until neutral.
  • Convert the chlorine form to the OH form.
  • Converted to the chlorine form.
  • Treat with 10x 4% aqueous sodium hydroxide solution.
  • When the ion exchange resin of the anion and cation resin adsorption equipment is packed into the column, add water and stir to remove air bubbles, let it stand for a few minutes until most of the resin settles, and then pour out the upper layer of mud-like particles.
  • Repeat the operation until the supernatant is clear, and then the column can be loaded.
  • When the ion exchange resin of the anion and cation resin adsorption equipment is packed into the column, put 1 cm of glass fiber at the bottom of the column, flatten it with a glass rod, and pour the resin into the column to prevent the generation of air bubbles.
  • In S1, the time for physical precipitation is 8-9 hours, and two sets of sedimentation tanks are set up to perform precipitation at the same time.
  • In S4, put activated carbon particles into the adsorption tank, the mass ratio of activated carbon particles and wastewater is 0.5:100, fully stirred, and activated carbon is used for adsorption, and the dioxane and active components in the wastewater are removed twice.
  • In S4, activated carbon particles are put into the adsorption tank, the mass ratio of activated carbon particles and wastewater is 1.3:100, fully stirred, and activated carbon is used for adsorption, and the dioxane and active components in the wastewater are removed twice.
  • In S4, put activated carbon particles into the adsorption tank, the mass ratio of activated carbon particles and wastewater is 2:100, fully stirred, and activated carbon is used for adsorption, and the dioxane and active components in the wastewater are removed twice.

Through the wastewater treatment process of the fatty alcohol polyoxyethylene ether sodium sulfate designed above, the dioxane and active components in the wastewater are first adsorbed by an anion and cation resin adsorption equipment.

Then, the treated wastewater is treated with activated carbon particles for a second time, and the dioxane and active components in the wastewater are removed for a second time.

The treated and purified wastewater can be reused in the production process, which reduces the production cost and greatly reduces the discharge of sewage.

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