Alcohol is a widely used chemical product and a clean fuel. The production methods of alcohol include fermentation and synthesis. During the production of alcohol, a large amount of waste water will be produced. Since the alcohol waste water contains a large amount of organic matter, it needs to undergo air flotation treatment and sludge drying treatment. In this case, polyacrylamide flocculant is needed Acrylamide. Composition of alcohol wastewater.
During the fermentation process of alcohol, the fermentation mash produces a large amount of yeast. After the solid-liquid separation, the solids in the wastewater are concentrated and separated, and the wastewater is subjected to secondary fermentation to concentrate and separate the yeast. The fermentation wastewater with waste molasses as the main raw material is brown-black. The COD of the yeast wastewater separated from the yeast liquid fermentation tank can reach 30000-7000mg/L, even more than 100000 mg/L, and the PH value is about 6.0-7.0. The wastewater also contains about 0.5% dry matter, the main ingredients are yeast protein, cellulose, colloidal matter, and the nutrients in the underutilized waste sugar. Characteristics of alcohol wastewater.
①The content of suspended solids (SS) is high, with an average content of 40000 mg/L;
②The water temperature is high, and the temperature of the alcohol wastewater discharged from the bottom of the distillation still reaches 100℃;
③High concentration, COD in alcohol wastewater is as high as 20000-70000 mg/L, including suspended solids, soluble COD and colloids, organic matter accounts for 93%-94%, inorganic matter accounts for 6%-7%, and the main component of organic matter is carbohydrates , Followed by nitrogen-containing compounds, and 500mg/L of organic acids;
④Wastewater contains about 500mg/L of organic acid, which is acidic. It needs to add alkali or return sludge in the initial operation. After the operation is stable, the system has sufficient buffering capacity, so there is no need to add alkali or return.
Under normal circumstances, polyacrylamide flocculant is used in two process links of raw water flotation treatment and sludge drying treatment in wastewater treatment of alcohol plants.
Air flotation treatment: It can treat suspended solids in wastewater. The main function is to absorb and bridge the suspended solids to flocculate into larger particles, reduce resistance and accelerate the rise of suspended solids to achieve the purpose of wastewater treatment.
Sludge drying treatment: The natural concentration of sludge will still have a high moisture content. Use a mechanical filter press to ensure that the sludge has sufficient filterability and a certain size of granularity. In this process, it is necessary to add Capitel cationic polyacrylamide.
Features of cationic polyacrylamide:
1. It is economical to use, and good results can be achieved at a very low dosage;
2. It can significantly improve production efficiency or increase the solid content of mud cake;
3. It is easy to dissolve in water;
4. In the solid-liquid separation in the production process, the capture rate of solids can be improved;
5. Work effectively in a wide pH range.
The above is about the introduction of polyacrylamide in alcohol wastewater treatment, I hope it will be helpful to everyone.
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