The concept and main pollutants of food industry wastewater来源： 作者: 阅读：108930 网友评论2条 Updated: 2009-11-18 14:26 Source: Author: Read: 108,930 User Reviews 2
The food industry has a wide range of raw materials and a wide range of products. The amount and quality of discharged wastewater varies widely. The main pollutants in the wastewater are (1) solid substances floating in the wastewater, such as vegetable leaves, peels, minced meat, poultry feathers, etc .; (2) substances suspended in the wastewater are oil, protein, starch, colloidal substances, etc. 3) Acids, alkalis, salts, and sugars dissolved in wastewater: (4) silt and other organic substances entrained in raw materials; (5) pathogenic bacteria and so on. Food industry wastewater is characterized by high organic matter and suspended matter content, easy to spoil, and generally has no major toxicity. Its harm is mainly to make the water body eutrophic, which will cause the death of aquatic animals and fish, promote the odor of organic matter deposited on the bottom of the water, deteriorate the water quality and pollute the environment.
In addition to proper pretreatment according to water quality characteristics, the wastewater treatment in the food industry is generally suitable for biological treatment. If the quality of the effluent is very high or the organic matter content in the wastewater is high, a two-stage aeration tank, a two-stage biological filter, or a multi-stage biological turntable can be used. Or use two kinds of biological treatment device in combination, or use anaerobic-aerobic biological treatment system in series.
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