Nanofiltration equipment

As a new separation technology, nanofiltration membrane exhibits the following three significant characteristics in its separation applications: firstly, its molecular weight cut-off is between reverse osmosis membrane and ultrafiltration membrane, ranging from 200 to 2000; Secondly, nanofiltration membranes have a certain retention rate for inorganic salts because their surface separation layer is composed of polyelectrolytes, which have electrostatic interactions with ions. The third is ultra-low pressure and high flux, which means it can still work under ultra-low pressure (0.1Mpa) and has a large flux.
From a structural perspective, most nanofiltration membranes are composite membranes, where the chemical composition of the surface separation layer and its support layer is different. Based on its first feature, it is speculated that the surface separation layer of the nanofiltration membrane may have a microporous structure of about 1nm, hence it is called "nanofiltration".
Nanofiltration membrane has a good effect on the separation of small molecular weight organic compounds and salts. Its separation process does not involve any chemical reactions, does not require heating, has no phase changes, does not affect the biological activity, flavor, and aroma of the separated substances, and has energy-saving and pollution-free characteristics
The membrane bioreactor developed by coupling nanofiltration membrane with biochemical reactor can separate products through membrane, while substrate and enzyme are intercepted. By continuously adding substrate, the goal of repeatedly utilizing enzyme and obtaining high-yield biochemical products can be achieved.

Main component functions:

1. Raw water tank: stores raw water for settling large sediment particles and other precipitable substances in the water. Simultaneously buffering the impact of unstable water pressure in the original water pipe on the water treatment system. (such as pressure sensing reactions caused by low or high water pressure).
2. Boosting pump: Constant system water supply pressure, stable water supply volume.
3. Multi media filter: a filter that uses multiple filtration layers, mainly aimed at removing substances such as sediment, rust, colloidal substances, suspended solids, etc. with particles above 20um in raw water. It can be controlled by manual valves or fully automatic controllers for a series of operations such as backwashing and forward flushing. Ensure the quality of water produced by the equipment and extend its service life. At the same time, the equipment has a self maintenance system and low operating costs.
4. Activated carbon filter; The system adopts a fruit shell activated carbon filter, which can not only adsorb electrolyte ions but also perform ion exchange adsorption. Activated carbon adsorption can also reduce the oxygen demand (COD) of potassium permanganate from 15mg/L (O2) to 2-7mg/L (O2). In addition, due to the adsorption effect, the concentration of adsorbed and replicated on the surface increases, thus playing a catalytic role, removing pigments, odors, a large amount of biochemical organic compounds, reducing the residual chlorine value and pesticide pollutants in water, and removing trihalides (THM) and other pollutants from water.
5. Ionic softening system/dosing system: In order to prevent the concentration product of CaCO3, MgCO3, MgSO4, CaSO4, BaSO4, SrSO4, SiSO4 on the concentrated water side, especially the last membrane module of the nanofiltration device, from exceeding its equilibrium solubility constant and causing crystallization and precipitation, which may damage the proper characteristics of the membrane components, an ion softening device or an appropriate amount of scale inhibitor should be used before entering the membrane module to prevent the crystallization of carbonates, SiO2, and sulfates
6. Precision filter: using precision filters to remove suspended solids, non straight particles, colloids, and other substances remaining in the inlet water, enabling the RO system to
Continued device operation is safer and more reliable. The filter element is a 5um melt blown filter element, designed to prevent impurities larger than 5um from being missed by the higher-level filtration unit. Prevent entering the reverse osmosis device and damaging the surface of the membrane, thereby damaging the desalination performance of the membrane.
7. High pressure pump: It adopts a vertical multi-stage stainless steel centrifugal high-pressure pump, which is an important component of the main engine. Its function is to deliver a certain amount of water with a certain pressure to the nanofiltration membrane. The quality of the product has a significant impact on the overall machine. During use, it should be ensured that there is no idling or long-term overload operation. Air should be regularly expelled as required, and electrical components should be kept dry.
8. Nanofiltration host: The nanofiltration host uses the pressure of a pump to separate the solvent in the solution through a nanomembrane, removing harmful substances from the water, as well as most bacteria, colloids, and high molecular weight organic matter, while retaining some trace elements.
9. Water storage tank: stores the finished water prepared by the nanofiltration host.
10. Ozone sterilizer: thoroughly kills bacteria generated by secondary pollution to ensure the hygiene indicators of finished water.

1. Reclaimed water, rainwater, sewage, and wastewater treatment
2. Food, beverage, and pharmaceutical industries: Nanofiltration membranes are widely used in this field, such as concentration and refining of various proteins, amino acids, vitamins, dairy products, alcoholic beverages, soy sauce, seasonings, etc.
3. Concentration and separation of aqueous solutions in chemical processes

1. SofteningMembrane softened water mainly utilizes the selective permeation characteristics of nanofiltration membranes for ions of different valence states to achieve water softening. Membrane softening can not only remove hardness, but also remove turbidity, color, and organic matter, and its effluent quality is significantly better than other softening processes. Moreover, membrane softening has the advantages of no need for regeneration, no pollution generation, simple operation, and less land occupation, and has significant social and economic benefits.
2. Used for removing organic matter from waterIn addition to softening, nanofiltration membranes are commonly used for decolorization, removal of natural and synthetic organic compounds (such as pesticides), three pathogenic substances, disinfection by-products (trihalomethanes and haloacetic acid) and their precursors, and volatile organic compounds in drinking water treatment, ensuring the biological stability of drinking water.
3. Application in pipeline direct drinking waterNanofiltration can intercept ions above divalent and other particles, and only allows water molecules and some monovalent ions (such as sodium, potassium, chloride ions) to pass through. Nanofiltration can be used to produce direct drinking water, retaining a certain amount of ions in the effluent and reducing treatment costs.