In recent years, with the rapid growth of the food industry, the waste water discharged by it greatly pollutes the environment, and loses a lot of energy and water resources, which in turn restricts its own growth. Due to the severe lack of resources in the face of the world at this stage, it is urgent to choose the appropriate waste water disposal punishment to achieve the goal of water saving and energy saving.
The important source of sewage in food industry is the process of food processing, such as punishment, washing, dehydration, filtration, dispersing and refining, deacidification, deodorization and cooking. Sewage contains a large amount of egg white, organic acids and carbohydrates. Due to the existence of many plankton, dissolved organic matter in water grows rapidly, and humus is easy to occur and accompanied by unpleasant gas. At the same time, copper, lead, manganese, chromium and other metal ions other metal ions in these sewage, and bacteria and coliform bacteria often exceed the national discharge scale.
The important pollutants in wastewater are (1) solid substances, such as vegetable leaves, pericarp, minced meat and poultry feathers, etc .;(2) oil, egg white, starch, colloid, etc .;(3) acid, alkali, salt, sugar, etc. dissolved in wastewater :(4) mud sand and other organic matter entrained by qualitative materials ;(5) pathogenic bacteria, etc. Food industry wastewater is characterized by high organic matter and suspended matter content, easy to erosion, the same usually no toxicity. Its harm is to make the water body eutrophication, so as to cause aquatic animals and fish to die, promote the accumulation of organic matter under the water odor, deterioration of water quality pollute the environment.
Since there are many kinds of food, there are many kinds of material springs, the sewage of food industry has the characteristics of suspended matter, high oil content, heavy metal ions, large COD and BOD value, large range of water quality and quantity change, high content of nitrogen and phosphorus compounds, and high water temperature in some environments. Therefore, the punishment of sewage disposal in food industry is usually to accept solid-liquid dispersion skills to remove suspended matter and drifters from sewage to reach the sewage discharge scale.
Solid-liquid dispersion skills we accept Zhejiang Sanlian environmental protection machine equipment deployment Co., Ltd. LW spiral discharge settling machine. It is important to be used in the field of solid and liquid dispersion in all living wastewater, industrial wastewater, chemical, food, pharmaceutical and similar production industries.
The process of wastewater from the food industry is as follows:
The suspension of wastewater in the food industry enters the drum through the feed pipe from the spiral outlet. Under the action of the centrifuge in which the high speed rotation takes place, the solid particles with large specific gravity are deposited on the inner wall of the drum. After dispersing the clear night through the liquid layer adjustment plate opening overflow and flow drum. The relative activity between the spiral body and the drum (that is, the differential speed) is realized by the differential, and its fineness is controlled by the auxiliary motor, thus realizing the continuous dispersion of the centrifuge to the material.
All kinds of waste water biological disposal punishment system is constantly emerging, the above-mentioned food wastewater is to accept the new solid-liquid dispersion skills, with high use rate, simple installation, wide application scope and other advantages, and has been put into practice in foreign countries, to achieve success. We can learn from the disposal and punishment skills of these ancestors, and trust that with the continuous strengthening of people’s awareness of environmental protection, the water environment of our country will certainly change.