Semi immersed fiber disc filter

Semi immersion typeFiber disc filterThe filter disc filter (microfiltration cloth filter) is currently available worldwide700A sewage treatment plant adopts this technology. The filter disc filter has good treatment effect, high effluent quality, and stable equipment operation.

1、 Purpose:

The semi immersed fiber disc filter is mainly used for cooling circulating water treatment and deep treatment of wastewater for reuse. As cooling water and circulating water, filtered and reused: inlet water qualitySS≤80mg/LBelow is the quality of the effluent waterSS≤20mg/LUsed for deep treatment of sewage, set in conventional activated sludge process, delayed aeration processSBRAfter the system, oxidation ditch system, drip filter system, and oxidation pond system, it can be used in the following fields: ① removal of total suspended solids ② removal of phosphorus by combining with chemical agents ③ removal of heavy metals, etc. The filter cloth turntable filter is used to filter the effluent of the activated sludge final settling tank. The design water quality is: influentSS：30mg/L（xAcceptable80－100mg/L）Out of the waterSS≤5mg/LTurbidity ≤2 NTUIn actual operation, the turbidity of the effluent is generally around1about.

2、 Working principle

The operation status of the semi immersed fiber disc filter is divided into two relatively independent and simultaneous processes: raw water filtration and backwashing sludge discharge. Both are completed at different positions on the same filter.

1、Raw water filtration: The sewage to be filtered enters the inner side of the rotating center cylinder of the filter through gravity drop, and there is a square water distribution hole on the rotating center cylinder. The sewage flows into the drum and enters the inner chambers of each filter disc through the water distribution port, then passes through the filter cloth, so that the suspended solids in the sewage are trapped on the inside of the filter disc. The filtered water is discharged through overflow collection. The device is in a stationary state during filtering.

2、Backwash: The sludge in the sewage is collected on the inside of the filter cloth, gradually forming a sludge layer. As sludge accumulates on the filter cloth, the filtration resistance of the filter cloth increases, and the water level of the filter gradually rises. By monitoring the changes in the liquid level in the tank through a liquid level gauge, when the liquid level in the tank reaches the cleaning (high water level),PLCControl the start of backwashing process: The filter disc drives the reducer under the rotation of the central cylinder to1～3change/Rotate at a speed of minutes, while the backwash water pump starts. The backwash water pump extracts filtered water and then uses a high-pressure umbrella shaped spray system located at the top of the filter disc to flush the filter cloth from the outside to the inside, thereby removing the dirt accumulated on the inner surface of the filter cloth, and then discharges it through the drain pipe. Clean the nozzle and move it up and down, clean the filter cloth without dead corners, and save cleaning water consumption. The frequency and duration of backwashing can be adjusted. During backwashing, the filter can continuously filter.

3、 Product Features

Semi immersed fiber disc filter,The rotary filter is composed of multiple filter discs vertically installed on the same central shaft, and the filtering medium is filter cloth. The filtering material includes nylon cloth/Fiber cloth/stainless steelThe first two have a short service life and unstable filtration accuracy, while stainless steel filters have a long service life.

1、Continuous operation;24Working continuously for hours without stopping for backwashing. Continuous filtration can be achieved while backwashing.

2、The processing effect is good. The aperture of the filter cloth is10Microns, capable of intercepting particles with a diameter smaller than10Microns (μ m)m）Small particles ensure the quality and stability of the effluent.

3、Low water consumption for backwashing. The water consumption for backwashing is equal to the total inflow1％～2％,Far less than the amount of water required for filtering by other filtering devices.

4、Small head loss. Generally, it is0.05～0.25m.

5、Low operating costs. The operating cost (excluding the cost of phosphorus removal agents) is less than0.01first/Ton of water.

6、Low installed power.Operate fully automated control. Filtering, backwashing, etc. are all controlled by programs and equipped with multiple protections, and do not require dedicated personnel for daily operation and management.

7、Small footprint. The vertical design of the rotary filter disc allows for a large filtration area with a small footprint.

8、The design and construction cycle is short. The rotary filter is modularized as a whole, with convenient and fast design and construction, and easy expansion.

4、 Characteristics of filter cloth rotary disc filter compared to conventional filter

1、The effluent quality is good and stable. The filter disc turntable filter adopts a filter disc wrapped with filter cloth (filter cloth material is stainless steelPEPolyester is used to replace the sand filter material in traditional filters. The filter cloth has a small pore size and can intercept particles with a diameter of several micrometers(μm)Due to its small particles, the effluent quality and stability are better than those of granular filters. However, before flushing the conventional filter, the water quality is poor due to penetration issues, and after flushing, the residual cleaning water in the filter layer will affect the effluent. In addition, the amount of filtered water also varies with the change of resistance.

2、The equipment is simple and compact, with few auxiliary devices, and the investment in the entire filtration system is low. The filter disc filter can continuously filter during cleaning. When backwashing the sand filter, it cannot filter continuously. To ensure continuity, an intermediate water storage tank needs to be set up in front of the sand filter or multiple filters need to work alternately. The filter disc filter uses a small flow high-pressure pump to suction filtered water for backwashing the filter cloth, eliminating many of the backwashing water tanks, water towers, etc. required by traditional filter tanks. Traditional filters require not only high-power water pumps and blowers, but also two sets of larger diameter pipe valve systems for air-water backwashing due to the high backwashing intensity. The entire system is complex and requires high investment. The automatic control system is huge and complex.

3、Low idle rate of equipment and low total installed power. Due to the thin filter cloth, it is very easy to rinse clean and the cleaning is very efficient. When cleaning, the area of the filter disc is only equivalent to the entire filter disc area1%. The characteristic of cleaning is frequent but short cleaning duration(1order/1-3Divide,10minute/order)The overall amount of cleaning water is also relatively small. However, traditional filter tanks have many equipment such as air-water backwash water pumps and blowers, large and numerous automatic valves, high power, and high idle rates.

4、Automated operation makes operation and maintenance simple and convenient. The filtering process is controlled by a computer, and the interval time and duration of the cleaning process and sludge discharge process can be adjusted. There is basically no need for dedicated personnel to maintain and manage. The maintenance workload of the filter cloth turntable filter is small. There are few mechanical equipment for the filter cloth turntable filter, and the pump and motor operate intermittently. The wear of the filter cloth is small, and the service life of the filter cloth is long10If the filter cloth becomes clogged due to certain reasons, it can be easily replaced. For sand filters, if the filter material is clogged, a large amount of cleaning work is required. Moreover, it is very difficult to replace the filter material in the sand filter.

5、The head loss is much smaller than that of a sand filter. The filter cloth turntable filter is generally0.2mThe head loss of sand filter is generally1.5mMany. The energy loss of the sand filter tank is large, which increases operating costs.

6、The footprint is much smaller than other filters. Due to the vertical hollow tube design of the filter disc, a small footprint can ensure a large filtration area, thereby reducing the pool capacity, material and earthwork volume, and significantly reducing the project cost. Daily processing1A 10000 ton filter tank, occupying an area of no more than20square meter,height2.35mFor technological transformation, it can solve the difficulty of insufficient space.

7、The filter disc filter is easier to install than the granular filter. After connecting the pipe fittings and electrical equipment on site, they can be put into use. However, granular filters often require the installation of filter media.

8、Short design and construction cycles. The filter cloth turntable filter is fully equipped and can be shipped as a whole, with convenient and fast design and construction; And expansion is easy.

9、Low endurance requirements for the base and low investment in equipment foundation.

The semi immersed fiber disc filter is particularly suitable for upgrading and renovating existing sewage treatment plants, which can increase the effluent from level B to level A. It has been widely used abroad and the technology is mature and reliable. In recent years, there have been many successful cases of application in China, and it is believed that they will be increasingly used in deep sewage treatment.

More aboutFiber disc filterFor relevant information, please follow the company website（www.sdmzj.com）！