Bath water → grid → regulating tank → lifting pump → bioreactor → circulating pump → precision filter → membrane separation device → intermediate water tank → booster pump → activated carbon filter → dosing machine → precision filter → reverse osmosis device → tablet dispensing machine → water storage tank

The bathing wastewater enters the regulating tank through the grid and then enters the bioreactor through the lifting pump. The aerator is activated for oxygenation, and the effluent from the bioreactor enters the hollow ultrafiltration membrane separation and treatment unit through the circulation pump. The concentrated water returns to the regulating tank, and the membrane separated produced water enters the water storage tank. It is then pumped into the reverse osmosis device through the booster pump and treated by reverse osmosis separation to produce clean water. Part of the concentrated water is circulated back to the membrane bioreactor for further treatment, while the other part is discharged.

It is recommended to use reinforced concrete structure for the regulating pool, with a recommended volume of 8m3-10m3.

Membrane bioreactor (MBR) technology is a new process that combines biological treatment technology with membrane separation technology, replacing the traditional two-stage precipitation process. It can efficiently perform solid-liquid separation, obtain stable water for direct use, and maintain a high concentration of microorganisms in the biological tank. The process has less residual sludge and effectively removes ammonia nitrogen, bacteria, viruses, etc.

Hollow ultrafiltration membrane devices are used in membrane bioreactors. Ultrafiltration technology is a high-tech widely used in the fields of water purification, solution separation, concentration, extraction of useful substances from wastewater, and wastewater purification and reuse. The characteristics are simple use, no need for heating, energy saving, low voltage operation, and small device footprint. Hollow fiber ultrafiltration membrane is a mature and advanced form of ultrafiltration technology. Hollow fiber outer diameter? 0.5-2.0nm, inner diameter? 0.3-1.4nm, the hollow fiber tube wall is covered with micropores, and the pore size is expressed in terms of the molecular weight that can intercept substances. The intercepted molecular weight can reach several thousand to several hundred thousand. The operating pressure requirement is between 0.05~0.15MPa, and the working temperature is between 5~45 ℃.

The reverse osmosis device consists of a high-pressure pump, reverse osmosis membrane components, water flow meter, online conductivity tester, membrane input and output pressure gauges, etc. The water production and wastewater flow rates, online conductivity, and membrane working pressure can all be monitored by instruments on the control panel. The high-pressure pump and membrane components are important components of this device.

The high-pressure pump re pressurizes the water treated by the membrane bioreactor to enhance the water flow rate and membrane clearance rate of the reverse osmosis membrane, typically within the range of 4.83-20.69Kgf/cm2. Rotary vane pumps are often used. The pumps are made of stainless steel or carbonized materials, making them suitable for immersion in chemical liquids, supply to reverse osmosis membranes, and water treatment systems. The high-pressure pump requires water for cooling and lubrication, so when the reverse osmosis membrane is working, the water supply needs to be sufficient and air should not enter the pipeline of the reverse osmosis membrane device, otherwise the high-pressure pump may be damaged within seconds. Operating the pump under high drainage pressure will also shorten the lifespan of the pump and motor.

Pollution cleaning