Problems in Circulating Water Operation of Sewage Treatment Equipment

The integrated sewage treatment equipment is compact in structure and occupies less land. It is all set underground. It is economical in operation, has strong anti-shock concentration ability, high efficiency in treatment, convenient in management and maintenance. All the performances of the equipment meet the relevant requirements after being used by users. So, what are the problems in the process of circulating water operation? Next, we will introduce in detail:

1. Scale: As the circulating water of domestic sewage treatment equipment evaporates continuously during cooling process, the concentration of salt in water increases continuously, and precipitates over the solubility of some salts. Common scales are calcium carbonate, calcium phosphate, magnesium silicate and so on. The scales have compact texture, which greatly reduces the heat transfer efficiency. The scales thickness of 0.6 mm reduces the heat transfer coefficient by 20%.

2. Fouling: Fouling is mainly composed of organic matter, microbial colonies and secretions, sediment and dust in water. The soft texture of the fouling not only reduces the heat transfer efficiency, but also causes corrosion under the fouling and shortens the service life of the equipment.

3. Corrosion: The corrosion of circulating water to heat exchanger equipment is mainly electrochemical corrosion. The causes include defects in the manufacture of domestic sewage treatment equipment, sufficient oxygen in water, corrosive ions (Cl-, Fe2+, Cu2+) in water and fouling caused by mucus secreted by microorganisms. The consequences of corrosion are very serious and uncontrolled. Make a short time even if the heat exchanger, water pipeline equipment is scrapped.

4. Microbial slime: Because circulating water dissolves enough oxygen, suitable temperature and rich nutrient conditions, it is very suitable for the growth and reproduction of microorganisms. If not controlled in time, it will quickly lead to deterioration of water quality, odor, blackening, a large number of fouling deposits in cooling towers or even blockage, cooling and heat dissipation effect will be greatly reduced, domestic sewage treatment equipment. Corrosion intensified. Therefore, the reproduction of microorganisms should be controlled in the treatment of circulating water.