The main components are: Hydrolysis acidification tank; Contact oxidation tank; Impurity sedimentation tank; Disinfection treatment; Sludge aerobic digestion tank.
1. Hydrolysis acidification tank
The main treatment of this process is to pre-treat the sewage before treatment, and carry out certain anaerobic fermentation of the wastewater in the water to improve the biodegradability of the sewage. This is an important step before the sewage treatment, which can directly affect the later sewage. The efficiency of the treatment and the processing time can maximize the efficiency of wastewater treatment and reduce consumption.
2. Contact oxidation pool
Oxidation tanks are divided into several grades according to the degree of pollution of water treatment, common type and enhanced type. It is generally judged based on the processing time. A normal type oxidation pond is used for a treatment time of no more than four hours, and a reinforced oxidation tank is used for a treatment time of between 4 and 6 hours. Mainly use the effluent from the hydrolysis acidification tank to the contact oxidation pond for biochemical treatment. Most of the organic matter in the raw sewage is degraded and purified here. The aerobic bacteria uses the filler as the carrier, and uses the organic matter in the sewage as the food material to decompose the organic matter in the sewage into inorganic salts, thereby purifying the object. The survival of aerobic bacteria must have sufficient oxygen, that is, there is enough dissolved oxygen in the sewage to achieve the purpose of biochemical treatment. The aerobic pool air is provided by the fan, and the tank adopts a new elastic three-dimensional filler. The filler has a large surface area ratio, long service life, easy to hang membrane and corrosion resistance, and the bottom of the pool adopts a rotary mixing aerator to make the transfer rate of dissolved oxygen high. At the same time, it has the advantages of light weight, no aging, no clogging, and long service life. The gas-water ratio of the contact pool is around 12:1. (0.5-5 m3/h contact pool is level 2)
3. Impurity sedimentation tank
After the sewage is treated by the biological contact oxidation pond, the effluent flows into the sedimentation tank and further precipitates and removes the fallen biofilm and some organic and inorganic small particles. The sedimentation tank is based on the principle of gravity, and the sewage containing the suspended matter flows from bottom to top. At the time, the substance is precipitated by gravity. The upper part of the sedimentation tank is provided with adjustable water rafts to adjust the water level; the lower part is provided with a conical sedimentation zone and a sludge gas device, the gas source is provided by a fan, and the sludge is sent to the sludge aerobic digester by gas stripping.
The disinfection tank is 30 minutes according to the standard «TJ14-74», if it is hospital sewage, the disinfection tank increases the residence time to 1-1.5 hours. Our company adopts chlorine dioxide disinfection device. The disinfection tank and disinfection device can continuously change the dosage according to the amount of water. It can achieve more water and more medicine, less water and less medicine. Other equipment can be prepared separately. (If used in industrial sewage, disinfection tanks and disinfection devices may not be used.)
5. Sludge aerobic digestion tank
The excess sludge discharged from the sedimentation tank is subjected to aerobic digestion and stabilization treatment in the tank to reduce the volume of the sludge and improve the stability of the sludge. The amount of sludge after aerobic digestion is small. When cleaning, the suction truck can be used to extend from the inspection hole of the sludge tank to the bottom of the sludge tank for suction and then transport (six times for half a year). A supernatant reflux device is arranged on the upper part of the sludge aerobic digestion tank to overflow the supernatant liquid to the hydrolysis acidification tank.