10 cubic meters of buried integrated sewage treatment equipment per day

10 cubic meters of buried integrated sewage treatment equipment per day

MBR, also known as membrane bioreactor, is a novel water treatment technology that combines membrane separation units with biological treatment units. There are various types of membranes, classified according to their separation mechanisms, including reaction membranes, ion exchange membranes, permeable membranes, etc; According to the properties of membranes, there are natural membranes (biofilms) and synthetic membranes (organic and inorganic membranes); According to the structural types of membranes, there are flat plate type, tube type, spiral type, and hollow fiber type.
(1) MBR sewage treatment is a sewage treatment process that combines membrane separation and biological treatment technology. Firstly, biodegradable organic pollutants in water are removed by activated sludge, and then the purified water and activated sludge are separated into solid and liquid using membrane separation technology.
(2) MBR sewage treatment process flow
Raw water → Grid → Regulating tank → Lift pump → Bioreactor → Circulating pump → Membrane module → Disinfection device → Reclaimed water storage tank → Reclaimed water use system

(3) MBR sewage treatment process flow description
The sewage enters the regulating tank through the grid and then enters the bioreactor through the lifting pump. The aeration machine is activated by the PLC controller for oxygenation. The effluent from the bioreactor enters the membrane separation treatment unit through the circulation pump, and the concentrated water returns to the regulating tank. The membrane separated water is disinfected by rapid mixing method (sodium hypochlorite, bleaching powder, chlorine tablets) and then enters the reclaimed water storage tank. The backwash pump uses the treated water in the cleaning tank to backwash the membrane treatment equipment, and the backwash wastewater returns to the regulating tank. Control the opening and closing of the lift pump by regulating the water level inside the bioreactor. The filtration and backwashing operations of the membrane unit can be controlled automatically or manually. When the membrane unit requires chemical cleaning operation, close the inlet valve and sewage circulation valve, open the chemical cleaning valve and chemical circulation valve, start the chemical circulation pump, and perform chemical cleaning operation.
The advantages of MBR sewage treatment are as follows:
(1) High removal efficiency of pollutants High removal efficiency of pollutants High removal efficiency of pollutants High removal efficiency of pollutants High removal efficiency of pollutants
MBR wastewater treatment has a very good removal effect on suspended solids (SS) concentration and turbidity. Due to the very small pore size of the membrane module (0.01-1 μ m), all suspended solids and sludge in the bioreactor can be intercepted, and its solid-liquid separation effect is much better than that of the secondary sedimentation tank. The removal rate of SS by MBR is over 99%, even reaching *; The removal rate of turbidity is also above 90%, and the effluent turbidity is similar to that of tap water.

(2) Due to the efficient retention effect of membrane modules, all activated sludge is retained in the reactor, allowing the sludge concentration in the reactor to reach a high level, up to 40-50g/L. This greatly reduces the sludge load in the bioreactor and improves the removal efficiency of MBR for organic matter. The average removal rate of COD and BOD in domestic sewage is over 94% and 96%, respectively. At the same time, due to the separation effect of membrane components in MBR wastewater treatment, the hydraulic retention time (HRT) and sludge retention time (SRT) in the bioreactor are separated. This allows microorganisms with slow growth and long generation time (such as nitrifying bacteria) to survive in the reactor, ensuring that MBR not only has efficient degradation of organic matter, but also has good nitrification function. Research has shown that MBR has an average removal rate of over 98% for ammonia nitrogen in treating domestic wastewater, with effluent ammonia nitrogen concentration below 1mg/L.
In addition, by selecting membrane components with appropriate pore sizes, MBR wastewater treatment also has a good removal effect on bacteria and viruses, which can eliminate the disinfection process in traditional treatment processes and greatly simplify the process flow.
In addition, when the DO concentration is low, there is an anoxic or anaerobic zone inside the bacterial micelle, which creates conditions for denitrification. Using only aerobic MBR process, although the removal efficiency of TP is not high, if it is combined with anaerobic treatment, the removal rate of TP can be greatly improved. Research has shown that using the A/O composite MBR process can achieve a removal rate of over 70% for TP.
(3) Has great flexibility and practicality
In urban sewage or wastewater treatment, the traditional treatment process (grid+sedimentation tank+primary sedimentation tank+aeration tank+secondary sedimentation tank+disinfection tank) has a long process, occupies a large area, and the effluent quality cannot be guaranteed. The MBR sewage treatment process (screen filtration+MBR), on the other hand, has a short process and small footprint! Due to its flexibility in handling water volume and other characteristics, MBR exhibits significant advantages. The water output of MBR can be adjusted by simply increasing or decreasing the number of membrane components according to the actual situation, which is very simple and convenient.
The MBR sewage treatment process can easily solve the sludge swelling phenomenon that occurs in traditional activated sludge processes, as it does not require a secondary sedimentation tank for solid-liquid separation. This greatly reduces the complexity of management operations and ensures high quality! Stable water output becomes possible. At the same time, MBR technology is very easy to achieve automatic control, which improves the automation level of sewage treatment.
(4) Solved the problem of difficult disposal of residual sludge, solved the problem of difficult disposal of residual sludge, and solved the problem of difficult disposal of residual sludge.
The disposal of surplus sludge is one of the key issues affecting the operation of sewage treatment plants. In the MBR sewage treatment process, the sludge load is very low, the nutrients in the reactor are relatively lacking, the microorganisms are in the endogenous respiration zone, and the sludge yield is low, resulting in a small amount of residual sludge production. SRT is prolonged, and the concentration of residual sludge discharged is high. Therefore, sludge concentration can be avoided and directly dehydrated, which greatly saves the cost of sludge treatment. Research has shown that the sludge discharge time of MBR in treating domestic sewage is around 35 days.

Oxidation ditch process is a type of sewage treatment process, also known as oxidation ditch, named after its closed circular ditch structure. It is a variant of the activated sludge process. Because sewage and activated sludge continuously circulate in the aeration channel, some people call it a "circulating aeration tank" or a "terminal free aeration tank". The hydraulic retention time of the oxidation ditch is long and the organic load is low, which essentially belongs to a delayed aeration system.

10 cubic meters of buried integrated sewage treatment equipment per dayMain design parameters of general oxidation ditch method
Hydraulic retention time: 10-40 hours;
Sludge age: generally greater than 20 days;
Organic load: 0.05-0.15kgBOD5/(kgMLSS. d);
Capacity load: 0.2-0.4kg BOD5/(m3/d);
Activated sludge concentration: 2500-4500mg/L;
The average flow velocity in the ditch is 0.3-0.5m/s.