Flocculation and biological membrane combined algae removal device

Abstract

The utility model discloses a flocculation and biological membrane combined algae removal device, and aims to solve the problem that the removal rate of harmful algae in eutrophicated water is low. According to the flocculation and biological membrane combined algae removal device, the sand filter tank, the flocculation tank, the biological membrane treatment tank and the adsorption tank are sequentially arranged in the water flow direction, sand filter filler is piled in the sand filter tank, the medicament box is arranged above the flocculation tank, clay minerals are contained in the medicament box, and the adsorption tank is arranged above the biological membrane treatment tank. The biological membrane treatment tank comprises a supporting plate, ceramic filter ball filler and an aeration disc, through holes distributed in an array are formed in the supporting plate, the supporting plate is filled with the ceramic filter ball filler, a biological membrane is loaded on the ceramic filter ball filler, the aeration disc is arranged below the supporting plate, and an activated carbon adsorption layer is arranged in the adsorption tank. According to the flocculation and biological membrane combined algae removal device disclosed by the utility model, a clay sedimentation method and a biological method are combined, so that the algae removal rate is improved, and the algae removal rate can reach about 80-90%.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment, specifically relating to a flocculation-biofilm combined algae removal device. Background Technology

[0002] The increasingly serious eutrophication of water bodies has become a global environmental problem. The frequency and severity of cyanobacterial blooms in freshwater lakes are showing an increasing trend, leading to eutrophication of water bodies. The most obvious characteristic of eutrophication is the excessive reproduction of algae, which brings the following harms to water supply projects: (1) Algae emit a foul odor, and some algae produce algal toxins under certain conditions, which are harmful to health and can cause intestinal diseases. (2) Algae and organic matter are also precursors of disinfection byproducts, which reduces drinking safety. (3) Algae can clog filter beds and consume more coagulants and liquid chlorine, increasing water treatment costs. (4) Algae and nutrients that penetrate the filter bed and enter the pipe network serve as a substrate for the growth and reproduction of microorganisms, causing secondary pollution due to the regrowth of bacteria in the water distribution network. (5) The organic matter of algae is easily oxidized, and the residual chlorine required by the system is consumed.

[0003] Algae removal methods generally include physical methods, chemical methods, enhanced coagulation methods, and biological treatment methods. However, since algae density is generally low, conventional coagulation and sedimentation methods have relatively low algae removal efficiency. Utility Model Content

[0004] The purpose of this invention is to solve the problem of low removal rate of harmful algae in eutrophic water bodies, and to provide a combined flocculation and biofilm algae removal device.

[0005] This utility model of a combined flocculation and biofilm algae removal device includes a sand filter, a flocculation tank, a biofilm treatment tank, and an adsorption tank. The sand filter, flocculation tank, biofilm treatment tank, and adsorption tank are arranged sequentially along the water flow direction. Filter sand packing is piled in the sand filter. A reagent tank containing clay minerals is set above the flocculation tank. A discharge pipe is set at the bottom of the reagent tank and extends into the flocculation tank.

[0006] The biofilm treatment tank includes a support plate, ceramic filter ball packing, and an aeration disc. The support plate has an array of through holes, and ceramic filter ball packing is filled on the support plate. The aeration disc is located below the support plate, and the ceramic filter ball packing is loaded with biofilm.

[0007] An activated carbon adsorption layer is set inside the adsorption tank.

[0008] This utility model of a combined flocculation and biofilm algae removal device mainly includes a sand filter, a flocculation tank, a biofilm treatment tank, and an adsorption tank. Eutrophic water containing algae flows into the sand filter for preliminary filtration, and then into the flocculation tank. Clay minerals are added to the flocculation tank, and the clay minerals are used to flocculate and settle the algae in the water. After settling, the upper layer of water flows into the biofilm treatment tank. The ceramic filter ball packing is loaded with an aerobic biofilm. The biofilm utilizes the flocculation and adsorption of algae. The algae are adsorbed onto the ceramic filter ball packing and removed by oxidation by microorganisms. Finally, the activated carbon adsorbent in the adsorption tank is used to adsorb and remove algae and byproducts such as algal toxins produced during the water treatment process.

[0009] This utility model combines flocculation and biofilm algae removal device with clay sedimentation and biological methods. It does not use chemical oxidants, making it more environmentally friendly and improving the algae removal rate to about 80-90%. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the new utility model's combined flocculation and biofilm algae removal device. Detailed Implementation

[0011] Specific Implementation Method 1: The flocculation and biofilm combined algae removal device in this implementation method includes a sand filter 1, a flocculation tank 2, a biofilm treatment tank 3, and an adsorption tank 4. The sand filter 1, flocculation tank 2, biofilm treatment tank 3, and adsorption tank 4 are arranged sequentially along the water flow direction. Filter sand packing material 1-1 is piled in the sand filter 1. A chemical tank 2-1 is set above the flocculation tank 2. The chemical tank 2-1 is filled with clay minerals. A discharge pipe 2-2 is set at the bottom of the chemical tank 2-1 and extends into the flocculation tank 2.

[0012] The biofilm treatment tank 3 includes a support plate 3-1, ceramic filter ball packing 3-2, and an aeration disc 3-3. The support plate 3-1 has through holes arranged in an array. The ceramic filter ball packing 3-2 is filled on the support plate 3-1. The aeration disc 3-3 is located below the support plate 3-1. The ceramic filter ball packing 3-2 is loaded with biofilm.

[0013] An activated carbon adsorption layer 4-1 is provided in the adsorption tank 4.

[0014] The clay minerals described in this embodiment are kaolin, montmorillonite, or kaolinite.

[0015] Specific Implementation Method Two: The difference between this implementation method and Specific Implementation Method One is that a stirrer is installed in the flocculation tank 2.

[0016] Specific Implementation Method 3: This implementation method differs from Specific Implementation Method 1 or 2 in that a discharge valve is provided on the discharge pipe 2-2 of the medicine tank 2-1.

[0017] Specific Implementation Method Four: This implementation method differs from Specific Implementation Methods One to Three in that the aeration disc 3-3 is connected to the air pump 5 via an air pipe.

[0018] Specific Implementation Method 5: This implementation method differs from Specific Implementation Methods 1 to 4 in that the thickness of the activated carbon adsorption layer in the adsorption tank 4 is 3 to 6 cm.

[0019] Example: The flocculation and biofilm combined algae removal device in this example includes a sand filter 1, a flocculation tank 2, a biofilm treatment tank 3, and an adsorption tank 4. The sand filter 1, flocculation tank 2, biofilm treatment tank 3, and adsorption tank 4 are arranged sequentially along the water flow direction. The tanks are connected by water pipes. Filter sand packing material 1-1 is piled in the sand filter 1. An agitator is installed in the flocculation tank 2. A chemical tank 2-1 is installed above the flocculation tank 2. The chemical tank 2-1 contains clay minerals. A discharge pipe 2-2 is installed at the bottom of the chemical tank 2-1. A discharge valve is installed on the discharge pipe 2-2 of the chemical tank 2-1. The discharge pipe 2-2 extends into the flocculation tank 2.

[0020] The biofilm treatment tank 3 includes a support plate 3-1, ceramic filter ball packing 3-2, and an aeration disc 3-3. The support plate 3-1 has through holes arranged in an array. The ceramic filter ball packing 3-2 is filled on the support plate 3-1. The aeration disc 3-3 is located below the support plate 3-1. The ceramic filter ball packing 3-2 is loaded with biofilm.

[0021] An activated carbon adsorption layer 4-1 with a thickness of 4 cm is provided in the adsorption tank 4.

[0022] In this embodiment, biofilm cultivation is carried out in advance in the biofilm treatment tank so that the ceramic filter ball packing is loaded with aerobic biofilm.

[0023] In this embodiment, the algae content in the raw water was approximately 4 × 10⁻⁶. 6 The raw water, containing mainly cyanobacteria (Cyanophyte) per liter, flows sequentially through a sand filter 1, a flocculation tank 2, a biofilm treatment tank 3, and an adsorption tank 4. The reaction in the flocculation tank 2 is controlled with stirring for 20 minutes, followed by settling for 2 hours. 0.3–0.4 g of clay is added to each liter of raw water in the flocculation tank 2. The hydraulic retention time in the biofilm treatment tank 3 is controlled at 4 hours.

[0024] After treatment by the combined flocculation and biofilm algae removal device in this embodiment, the algae removal rate of the effluent from adsorption tank 4 can reach about 86%, while reducing the turbidity of the water.

Claims

1. A combined flocculation and biofilm algae removal device, characterized in that... The combined flocculation and biofilm algae removal device includes a sand filter (1), a flocculation tank (2), a biofilm treatment tank (3) and an adsorption tank (4). The sand filter (1), flocculation tank (2), biofilm treatment tank (3) and adsorption tank (4) are arranged sequentially along the water flow direction. Filter sand packing (1-1) is piled in the sand filter (1). A reagent tank (2-1) is set above the flocculation tank (2). The reagent tank (2-1) is filled with clay minerals. A feed pipe (2-2) is set at the bottom of the reagent tank (2-1). The feed pipe (2-2) extends into the flocculation tank (2). The biofilm treatment tank (3) includes a support plate (3-1), ceramic filter ball packing (3-2), and an aeration disc (3-3). The support plate (3-1) has an array of through holes. The ceramic filter ball packing (3-2) is filled on the support plate (3-1). The aeration disc (3-3) is located below the support plate (3-1). The ceramic filter ball packing (3-2) is loaded with biofilm. An activated carbon adsorption layer (4-1) is provided in the adsorption tank (4).

2. The flocculation and biofilm combined algae removal device according to claim 1, characterized in that... An agitator is installed in the flocculation tank (2).

3. The flocculation and biofilm combined algae removal device according to claim 1, characterized in that... A discharge valve is installed on the discharge pipe (2-2) of the medicine tank (2-1).

4. The flocculation and biofilm combined algae removal device according to claim 1, characterized in that... The aeration disc (3-3) is connected to the air pump (5) via an air pipe.

5. The flocculation and biofilm combined algae removal device according to claim 1, characterized in that... The thickness of the activated carbon adsorption layer in the adsorption tank (4) is 3-6 cm.

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