Using the filter membrane device does not need flocculation chemical treatment, nor does it need evaporation separation, only need the pressure to separate the solid and liquid in the water, which is a major feature of the filter membrane treatment.
Application of drinking water In MF, UF, NF, and RO, RO has not been used except for desalination applications. Almost all the salt is removed by RO, and the treated water is pure water that none of the salt has, even purer than distilled water, which of course cannot be used as drinking water. If it is to be used, it is necessary to add salt which is beneficial to human health, and there is no condition to meet this requirement.
The removal of salt by NF is second only to that of RO, but the removal rate is also very high. NF is generally used as soft water and is not suitable for drinking water due to the above reasons. Thus, the membranes used for water treatment should be MF and UF membranes. Such membranes are used primarily to remove colloids and plankton, to remove insoluble iron and manganese, and to remove fungi.
However, in order to prevent the bacteria from regenerating in the clear water, the sterilization process cannot be eliminated. Given the degree to which UF removes the molecular weight of the substance, it does not have the ability to remove organic solvents such as ozone and ethylene trihalide, which form a thin film on the membrane surface that may be removed in the future and maybe examined in the future.
In the type of membrane, external pressure hollow system or tube membrane is suitable for use. If the external pressure membrane is adopted, the raw water of the sedimentation tank can be directly connected with the membrane for treatment. In order to prevent membrane holes from being blocked, the floating substances in the original water should be removed before flowing into the membrane.
Drinking water application The conventional treatment procedures of the water treatment plant are condensation, precipitation, and filtration. In the water treatment plant of membrane separation, the treatment procedures are simple and only need to be treated by the filter membrane device when the raw water meets the treatment conditions of the filter membrane. (when the water quality deteriorates, the conventional treatment or micro-screen treatment is still needed.)In terms of energy consumption, the filter membrane is used for full filtration. Since the pressure is increased through the filter membrane, the raw water pump still needs to be considered in increasing the pressure.
Advantages of processing From the experience of using membrane in the past, the raw water (river water, reservoir water, and nutrient-rich lake water) used for drinking water was treated with MF membrane without coagulant, and compared with the conventional treatment of coagulation, precipitation and filtration with a coagulant, the former and the latter treated water quality was equal to or exceeded.
Membrane separation technology is used to provide only the necessary operating pressure for the raw water supply, and only a long running time is needed to flush the filter membrane, no other process. At present, there are various processes for coagulation, precipitation, and filtration water treatment, so the dosing rate cannot be set. In this case, it is easy to automate the operation of the membrane device and achieve unattended management, while it is not easy to automate routine processing.
Using a filter membrane water plant, the membrane device occupies a small area, and it is easy to reduce the area of the plant by half for the conventional treatment of the same amount of water. The remaining place can be equipped with an activated carbon treatment devices. As a result of the filter membrane water, plants can be unmanned, the staff living in the building and supporting facilities can be cut.
At present, the service life and price of the filter membrane are unknown, and the total cost is not easy to calculate. However, from the point of view of the membrane treatment of electricity and pharmaceutical costs are small, compared to the conventional treatment of high maintenance and management costs of the situation has great advantages.
As the membrane treatment does not require dosing, the amount of sludge is reduced, so it is easy to treat. Whether this is the case is still in the research stage, with no clear results.