CN105217734A - A rotary immersion water treatment ultra-microfiltration method and device - Google Patents

Abstract

The invention relates to a rotary immersion type water treatment ultramicro-filtration method and a device, wherein two ends of hollow fiber membrane filaments are respectively cast on an upper membrane filament disc and a lower membrane filament disc, the upper membrane filament disc is connected with a water collecting tank, the lower membrane filament disc is fixed with a component chassis, cavities of the membrane filaments are communicated with cavities of the water collecting tank, the membrane filaments and the water collecting tank form a whole body to form a membrane component, the water collecting tank is connected with a hollow shaft, the hollow shaft hoists the membrane component on a bearing seat and is communicated with a negative pressure water outlet pipe, a pin gear fixed on the water collecting tank, a speed reducer, a transmission shaft and a pinion form a driving device, the membrane component can be driven to rotate positively and negatively to enable the membrane filaments to be in a motion state, the system adopts a pump or siphon mode to realize negative pressure, raw water is filtered by the membrane to discharge purified water from a negative pressure water discharge pipe, the membrane filaments and water flow generate, effectively prevents the surface of the membrane from being blocked, and prevents the filtration flow from being attenuated.

Description

A rotary immersion water treatment ultra-microfiltration method and device

technical field

The invention belongs to the field of water treatment equipment, and relates to a rotary submersion ultra-microfiltration method and device for water treatment.

Background technique

Water is the source of life, one of the indispensable elements in economic development, industrial and agricultural production, and the material basis of human existence. Over the past few decades, with the reform and opening up of our country and the rapid development of industrialization, various industrial wastewater and domestic sewage with complex components often directly enter the water body without reaching the standard, resulting in a sharp decline in the quality of drinking water sources. Traditional drinking water purification technology is facing many problems. challenge. In addition, my country is a country seriously short of water, the per capita share of water resources is only 1/4 of the world's average level, and the water consumption per 10,000 yuan of GDP is far higher than the international advanced level, the current shortage of water resources has seriously affected my country's economic development and social progress. Therefore, the development of new high-efficiency drinking water purification technology and water advanced treatment technology is of great significance to ensure drinking water safety, improve water reuse rate, reduce water consumption, and promote sustainable social and economic development.

In recent years, membrane technology has gradually become a hot issue in the research and application of drinking water purification and advanced treatment of waste (sewage) water. Ultrafiltration or microfiltration can most effectively remove the precursors of natural organic matter and chlorine disinfection by-products in water bodies, and the removal rate of turbidity and bacteria is close to 100%.

Submerged continuous membrane filtration system (SMF) can remove particles larger than 0.03 microns in water. SMF uses external pressure hollow fiber ultrafiltration membranes to maintain the operating flow of the system through low-pressure air-water double washing + backwashing and backwashing processes. The flow direction of filtration is from the outer wall of the hollow fiber to the hollow lumen. The incoming water passes through the porous fiber wall and the solids in the water are trapped on the outer wall. The membrane can remove particles larger than 0.03 microns, and effectively remove microorganisms and suspended solids in water. The main component of the SMF unit is the SMF membrane element. SMF membrane elements are composed of thousands of microporous hollow fiber membranes and heads. The upper end of the membrane module can allow the filtrate water to flow from the hollow fiber membrane cavity to the water collection pipeline. The bottom head blocks the outlet of the fiber membrane, but allows low pressure process air to pass through a series of openings in the head to scour the outer surface of the hollow membrane during backwashing.

The membrane and water body of the existing submerged continuous membrane filtration system are in a relatively static state. In the membrane filament fixing groove, negative pressure is generated in the membrane, so that the water passing through the membrane tube is discharged from the membrane filament fixing groove at both ends after being filtered by the membrane. Pollutants in this filtration method accumulate on the surface of the membrane, making the pores of the membrane filaments easily blocked and reducing the filtration efficiency.

Patent document CN103331101A discloses an ultrafiltration membrane assembly, including a pressure-bearing membrane tube and an ultrafiltration membrane group, characterized in that: the ultrafiltration membrane group is movably assembled in the pressure-bearing membrane tube, and the pressure-bearing membrane tube includes a membrane tube, end caps arranged at both ends of the membrane tube and fasteners connecting the membrane tube and the end cap, one end of the ultrafiltration membrane group is provided with a water inlet, and the other end is provided with a water outlet, and the end cap at one end of the membrane tube is A raw water inlet is provided, and the end cap at the other end of the membrane tube is provided with a purified water outlet, the water inlet is detachably connected to the raw water inlet, and the water outlet is detachably connected to the purified water outlet.

CN103055700A discloses an ultrafiltration membrane assembly. The ultrafiltration membrane assembly of the present invention includes ultrafiltration membrane filaments, and the two ends of the ultrafiltration membrane filaments are respectively connected to the first membrane filament fixing groove and the second membrane filament fixing groove. The outer side of the wire fixing groove is connected with the first plug, the second membrane wire fixing groove is connected with the second plug, the membrane wire fixing tube is connected between the first membrane wire fixing groove and the second membrane wire fixing groove, and the ultrafiltration membrane The membrane filament and the membrane filament fixing pipe are poured into one body. Compared with the prior art, an ultrafiltration membrane module of the present invention installs the membrane fixing tubes in the two membrane fixing grooves, and the membrane fixing tubes and the membranes are poured together, so that the membranes are better fixed in the blocking Between the heads, the membrane filament does not adhere to the membrane tube. When the membrane filament is aged or damaged, it is only necessary to replace the membrane filament fixing tube and the membrane filament that are poured together, thereby saving costs. At the same time, the membrane filament fixing tube forms It provides a channel for the circulation and collection of the filtered liquid and supports the ultrafiltration membrane.

The above-mentioned disclosed documents cannot solve the above-mentioned problems, and the technical solutions still need to be continuously improved.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of the prior art, and provide a rotary immersion water treatment ultra-microfiltration method and device with simple device structure, not easy to block, and high filtration efficiency.

The technological scheme that the present invention realizes purpose is as follows:

A rotary immersion ultra-microfiltration method for water treatment. No membrane tube is arranged outside the membrane module, so that the membrane filaments are in an open state and directly contact the flowing filtered water. The driving device is used to make the membrane module rotate forward and backward in the treated water. During the movement, the water flow and the membrane filaments move relative to each other. The dirt on the membrane filament surface is washed away in time due to the scouring force of the water flow on the surface of the membrane filament.

A rotary submerged ultra-microfiltration device for water treatment, comprising several bundles of membrane filaments, a membrane filament disc, a component chassis, a water collection tank, a hollow shaft, a bearing seat and a negative pressure drainage pipe. Both ends of each bundle of membrane filaments are cast on the upper and lower membrane filament disks, the membrane filament disks at the lower end are uniformly fixed on the module chassis, and the membrane filament disks at the upper end are sealed and evenly distributed and fixed on the water inlet holes on the lower surface of the sump Around, the membrane silk hole communicates with the inner cavity of the sump. The water collection tank is flange-connected with the hollow shaft, and the snap ring on the hollow shaft is installed on the bearing in the bearing seat, so that it can bear the weight and rotation of the membrane module. The flange of the negative pressure drain pipe is connected to the flange of the bearing seat, so that the sump, the hollow shaft, and the negative pressure drain pipe form a drainage channel. A driving device component is installed on the sump so that the membrane module can rotate coaxially.

The structure of the driving device is as follows: a ring of meshing pin gears is fixed on the outer circumference of the upper surface of the water collection tank, a small gear is fixed on the outer edge of the pin gear, and the pinion and the transmission shaft are fixed on the end of the output shaft of the reducer . The driving device makes the membrane assembly do forward and reverse rotation.

Moreover, a group of supporting connecting rods is evenly fixed between the water collection tank and the component chassis.

Advantage and beneficial effect that the present invention obtains are:

In the rotary immersion water treatment ultra-microfiltration device provided by this application, one end of the membrane filament is blocked, and the other end is installed in the membrane filament disk without blocking the filament hole, and the membrane tube is no longer installed, so that the membrane filament is directly placed in the to-be-treated In sewage or waste water, the enrichment of impurities by the membrane tube is effectively prevented, so that the pores of the membrane filament are not easy to be blocked.

The device provided by this application makes the membrane module rotate forward and backward in the water to be treated. During the movement, the water flow and the membrane filaments move relative to each other. Since the surface of the membrane filament is subjected to the scouring force of the water flow, the dirt on the surface of the membrane filament is taken away in time, effectively preventing The clogging of the membrane surface is prevented, the sewage filtration flow does not attenuate, and the filtration efficiency is improved.

Description of drawings

Fig. 1 is a schematic diagram of the device of the present invention; wherein, 1—component chassis; 2—lower membrane wire disc; 3—membrane wire; 4—upper membrane wire disc; 5—water collection tank; 6—hollow shaft; 7—bearing seat; 8—bearing; 9—snap ring; 10—negative pressure drain pipe; 11—reducer; 12—transmission shaft; 13—pinion gear; 14—pin gear; 15—support connecting rod.

Fig. 2 is a sectional view taken along line A-A of Fig. 1 .

detailed description

The present invention will be described in further detail below through specific examples. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

A rotary immersion ultra-microfiltration method for water treatment, in which no membrane tube is arranged outside the membrane module, so that the membrane filaments are in an open state and directly contact the flowing filtered water. The driving device is used to make the membrane module rotate forward and backward in the water to be treated. During the movement, the water flow and the membrane filaments have relative friction. Because the surface of the membrane filament is subjected to the scouring force (tangential force) of the water flow, the dirt on the surface of the membrane filament is taken away in time. .

A rotary submerged ultra-microfiltration device for water treatment, comprising several bundles of membrane filaments 3 , membrane filament discs 2 and 4 , an assembly chassis 1 , a water collection tank 5 , a hollow shaft 6 , a bearing seat 7 and a negative pressure drain pipe 10 . The two ends of each bundle of membrane filaments are cast on the upper and lower membrane filament disks, the membrane filament disk 2 (filament hole plugging) at the lower end is uniformly fixed on the module chassis 1, and the membrane filament disk 4 at the upper end is sealed and fixed evenly Around the holes on the lower surface of the sump 5 , the membrane thread holes communicate with the inner cavity of the sump 5 . The sump 5 is flange-connected with the hollow shaft 6, and the snap ring 9 on the hollow shaft 6 is installed on the bearing 8 in the bearing seat 7, so that it can bear the weight and rotation of the membrane assembly. The flange of the negative pressure drain pipe 10 is connected to the bearing block 7 flanges, so that the sump 5, the hollow shaft 6, and the negative pressure drain pipe 10 form a drainage channel to discharge purified water.

In order to reduce the pollution efficiency of the membrane filaments, it can be realized by the movement of the membrane filaments, such as rotating the membrane module. This application recommends a realization method: a ring of meshing pin gears 14 is fixed on the outer circumference of the upper surface of the sump, and the pin gears The outer edge of the pinion gear 13 is fixed, and the pinion gear and the transmission shaft 12 are fixed on the output shaft end of the speed reducer 11. The reducer with motor makes the membrane module rotate forward and backward, so that the membrane filament is in a moving state to purify the sewage and reduce the surface pollution of the membrane filament.

In order to increase the supporting force of the upper and lower membrane wire discs and make the membrane module into a whole, a set of supporting connecting rods is evenly fixed between the sump and the module chassis (the left, middle and right connecting rods are used in the figure) .

In this application, the operation method of the rotary immersion water treatment ultra-microfiltration device is:

The whole device is fixed on the platform of the sewage treatment tank, the sewage water level is controlled below 1/2 thickness of the sump, and the reducer starts to work after starting the motor to drive the membrane module to rotate. Pumping or siphoning is used to realize negative pressure, forcing water to pass through the surface of the membrane filament, enter the membrane filament, and collect upward into the sump. The purified water is discharged and collected through the hollow shaft and negative pressure drain pipe, or enters the lower Inside the primary purification equipment.

The driving device can control the positive and negative rotation of the membrane module, and the linear speed of the outer edge of the sump is 0.5m/s~1m/s.

During the movement of the membrane module, due to inertia, there is a speed difference between the water flow and the membrane filaments, which causes relative motion between the two, and the relative friction between the membrane filaments and the water flow. The scouring force of the water flow makes the dirt attached to the membrane surface promptly removed It effectively prevents the clogging of the membrane, prevents the filtration flow from attenuating, and improves the filtration efficiency.

Claims (4)

1. rotate an immersion water treatment ultra filtration method, it is characterized in that: membrane module outside no longer arranges housing, make film silk be in a kind of unlimited state, direct contact flow be filtered water body.Adopt drive unit to make membrane module carry out positive and negative rotation motion in processed water, current and film silk generation relative movement, because film silk surface is subject to the scouring force of current, in time the dirt on film silk surface is washed out.

2. one kind rotates immersion water treatment ultramicro filtration device, it is characterized in that: device comprises some bundle film silks, film wire tray, assembly chassis, water leg, tubular shaft, bearing support and drainage by suction pipe, the two ends of often restrainting film silk are all cast in film wire tray and lower film wire tray, be positioned at that the film wire tray of lower end is uniform to be fixed on assembly chassis, the film wire tray sealing being positioned at upper end is uniformly fixed on water leg lower surface, film silk cavity communicates with water leg inner chamber, water leg and tubular shaft Flange joint, snap ring on tubular shaft is arranged on the bearing in bearing support, weight and the rotation of membrane module can be born, the flange of drainage by suction pipe is connected with bearing block flange, make water leg, tubular shaft, drainage by suction pipe forms a drainage channel, water leg is provided with driving device component, make membrane module coaxial rotation.

3. rotation immersion water treatment ultramicro filtration device according to claim 2, it is characterized in that: the structure described water leg being provided with driving device component is: be fixedly mounted with a circle engaging pin gear at water leg upper surface excircle, a pinion(gear) is fixedly mounted with in the outer rim of pin gear, pinion(gear) and transmission shaft are packed in the output shaft end of step-down gear, and drive unit makes membrane module do positive and negative rotation motion.

4. rotation immersion water treatment ultramicro filtration device according to claim 2, is characterized in that: between water leg and assembly chassis, be fixedly mounted with one group of support link.