食品加工污水處理設備松原

食品加工污水處理設備松原

Editing of Wastewater Properties

Wastewater is a complex system composed of water and various impurities, which is represented by water indicators. Water indicators can be divided into physical indicators, chemical indicators and biological indicators. Various water indicators can indicate the types and of impurities in water, and can judge whether the water is good or bad and whether the discharge indicators are met. In wastewater treatment, the determination of treatment degree, the selection of process flow, the design and operation management of treatment process must have a full understanding of the nature of wastewater, otherwise it is impossible to achieve good results. The main water indicators of wastewater are as follows.

Editing of Physical Index of Wastewater

Physical indicators of wastewater mainly include temperature, color, odor and solid content. Chromaticity and solid content are often detected.

1. Chromaticity Food industry wastewater often contains organic matter or inorganic dyes, biological pigments, inorganic salts, organic additives and so on, but wastewater is colored, and the color is very deep. In water analysis, the index to measure the degree of water color is chroma. In general, the true color after removal of suspended solids is taken as the standard. The colorimetric analysis method is used to compare the color of the standard colored solution of known concentration with that of the water sample of unknown colority.

2. Most of the magazines in wastewater with solid content belong to solid substances. These solid substances exist in water in the form of dissolution and suspension. They are called total solids, including organic compounds, inorganic compounds and various organisms. In water analysis, besides the determination of total solid content, several indicators such as suspended solids, volatile suspended solids and dissolved solids should also be determined.

(1) Total Solid (TS) refers to the residue of a certain amount of water sample dried at 105-110 C in water analysis, which is expressed by weighing.

(2) Suspended solids (SS) or suspended solids are the parts of total solids in suspended state, which contain organic and inorganic components.

(3) Volatile suspended solids (VSS) are the weight loss of suspended solids by heating and burning at 600 (?) C, representing the organic part of suspended solids, one of which is biodegradable suspended solids (BVSS) and the other is non-biodegradable (NBVSS).

(4) Non-volatile suspended solids (NVSS) is the residual part of suspended solids after burning, also known as ash, which represents the inorganic part of suspended solids.

(5) Dissolved solids (DS) or dissolved solids refer to the dissolved part of the total solids, which is obtained by drying and weighing a certain amount of filtrate of water samples.

Selection of Food Wastewater Treatment Technology and Application Editor of Disposal Agents

Food industry has a wide range of raw materials and products. The and of wastewater discharged vary greatly. But in general, the main pollutants in food wastewater are

(1) Solid substances floating in wastewater, such as vegetable leaves, peel, minced meat, poultry feathers, etc.

(2) Substances suspended in wastewater are grease, protein, starch, colloidal substances, etc.

(3) acid, alkali, salt, sugar dissolved in wastewater, etc.

(4) Mud, sand and other organic substances entrained by raw materials, etc.

(5) Fatal pathogens, etc.

The common characteristics of wastewater from food industry are high content of organic substances and suspended solids, easy to be corrupted, and generally without great toxicity. The main hazards are eutrophication of water bodies, resulting in the death of aquatic animals and fish, promoting the foul smell of organic matter deposited on the bottom of the water, deteriorating water and polluting the environment.

In addition to proper treatment according to the characteristics of water , biological treatment is generally suitable for food industry wastewater treatment. If the re of effluent is very high or the organic matter content in wastewater is very high, two-stage aeration tank or two-stage biological filter, or multi-stage biological rotary table, or two biological treatment devices are combined, or anaerobic-aerobic series biological treatment system can be used.

From the selection of polyacrylamide for food wastewater sludge dewatering agent, cationic polyacrylamide is generally chosen as sludge dewatering agent, which is similar to the biochemical sludge of domestic sewage treatment plant. We know that the sewage of domestic sewage treatment plant is relatively high in organic matter content. Most of the sewage comes from restaurant wastewater, fecal wastewater and washing in our daily life. Bath wastewater, etc. From the analysis of the complexity of the source structure of wastewater, it is similar to food wastewater.