The design of domestic sewage treatment equipment is mainly aimed at the treatment of domestic sewage and similar industrial organic sewage. Its main treatment method is to use the currently mature biochemical treatment technology - contact oxidation method. The water quality parameters are designed according to the general domestic water quality, with inlet BOD200mg/1 and outlet BOD200mg/1 indicators,

There are six parts in total: regulating pool; Contact oxidation tank; Secondary sedimentation tank; Disinfection device; Sludge treatment machine; Fan,

Below is a detailed description of each unit of the domestic sewage treatment equipment:

Primary sedimentation tank: The primary sedimentation tank is a vertical flow sedimentation tank, and the upward flow rate of sewage in the deep sedimentation tank is 0.6-0.7 millimeters per second, allowing large particle sludge to settle down and reducing the load of subsequent biochemical treatment. The settled sludge is lifted to the regulating tank through the sludge pipeline for further circulation treatment;

2. Contact oxidation tank: After initial sedimentation, the water flows automatically to the contact tank for biochemical treatment. The contact tank is divided into three stages, with a total residence time of more than 1 hour. Among them, the reinforced equipment can achieve a contact oxidation time of up to 6 hours. The filler is a novel filler that is easy to film and does not block. The specific surface area of the filler is 160m2/m3, and the gas water ratio of the contact tank is around 12:1;

3. Secondary sedimentation tank: Biochemical wastewater flows into the secondary sedimentation tank, which consists of two vertical flow sedimentation tanks operating in parallel. The upward flow velocity is 0.3-0.4 millimeters per second. The sludge is discharged by air lifting to the sludge device;

4. Disinfection pool device: The disinfection pool follows the standard of "TJ14-74" for 30 minutes. If it is hospital sewage, the retention time of the disinfection pool can be increased to 1-1.5 hours, and solid chlorine tablets are used for contact dissolution disinfection. The disinfection device can continuously change the dosage according to the size of the water output, achieving the goal of adding more water and more medicine, and adding less water and less medicine. Other disinfection devices can be prepared separately;

5. Sludge device: The clear liquid from the sludge tank flows back to the heat exchange oxidation tank for further treatment. After digestion, there is very little residual sludge, which is usually cleaned once every 1-2 years. The cleaning method is to use a suction truck to reach into the bottom of the sludge tank through the inspection hole and extract it for external transportation. It can also be processed through a loop;

6. Fan: The fan is located above the disinfection area, and the inlet adopts double-layer sound insulation. The inlet has a muffler and a fan filter, so there is no noise during operation; The operating life of a single wind turbine is about 30000 hours.

Application characteristics of domestic sewage treatment equipment:

(1) Scope of application: Suitable for domestic sewage treatment in residential areas, restaurants, hotels, nursing homes, schools, mines, factories, and similar industrial sewage treatment.

(2) Equipment features: Integrated treatment of BOD5 COD、NH3-N、 Fecal Escherichia coli and pH are present in one body; Wastewater treatment equipment can be installed on the surface or buried underground; The generated voice is low and has less odor, with minimal impact on the surrounding environment; High degree of purification and low sludge production in the entire system; High degree of automation, convenient management, no need for dedicated personnel to manage; Stable technology and easy maintenance; Low energy consumption, saving operating costs.

(3) Model specifications: The domestic sewage treatment equipment produced by Qingzhiyuan has six integrated equipment models with fixed specifications; There are also complete sets of equipment designed and manufactured based on the amount or quality of domestic sewage.

(4) Process description: The design of domestic sewage treatment equipment is mainly for the treatment of domestic sewage and similar industrial organic sewage. The main treatment method is to use the mature biochemical treatment biological contact oxidation method. The water quality design parameters are calculated according to the general domestic sewage water quality design. The average BOD5 value of the inlet water is 200mg/L, and the average BOD5 value of the outlet water is 20mg/L.

a、 The hydrolysis regulating tank is not inside the equipment and needs to be built separately by the user. The tank must be equipped with one coarse and one fine grid each to intercept coarse slag and larger suspended solids in the sewage.

b、 The middle part of the biological contact oxidation tank is filled with composite packing materials; Two SLB jet aerators are installed at the bottom, one for timed automatic aeration and the other for linked operation with the lifting pump.

c、 The sedimentation tank is a sloping plate, and the inlet and outlet pipes in the tank are equipped with multiple rows of holes for water distribution and collection, ensuring stable water flow; The bottom of the pool is a "V" - shaped sloping bottom and equipped with two porous sludge discharge pipes. The sludge in the pool is pumped out by a water pump or manure truck every 3-6 months for transportation.