Water resource utilization rate auxiliary process for improving water production effect of waterworks

Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a water resource utilization rate auxiliary process for improving the water production effect of a waterworks, which comprises the following steps: carrying out flocculent precipitation on raw water to form sludge water and water to be filtered; inputting the to-be-filtered water into a filter tank, filtering the to-be-filtered water to form filtered water and backwashing water, inputting the backwashing water into a backwashing reuse water tank, converting the backwashing water into clear liquid and scum by using an air flotation system in the backwashing reuse water tank, inputting the clear liquid to be mixed with raw water, and filtering the scum to obtain the purified water. Treating the filtered water by using an air flotation system in the filter tank; sludge water is input into a sludge discharge tank, the sludge water is converted into clear liquid, sludge and scum by utilizing an air flotation system in the sludge discharge tank, and the clear liquid is mixed with raw water. The blocking speed of the filter can be slowed down and the backwashing period of the filter is prolonged. The biochemical effect can be improved, and the removal of 2-methylisoborneol, geosmin and the like is facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment, and particularly relates to an auxiliary process for improving the water resource utilization rate in a waterworks for producing tap water. Background Art

[0002] Currently, most waterworks in China usually adopt conventional treatment processes, in which raw water is subjected to coagulation reaction treatment, sedimentation treatment, filtration treatment, and post-filtration disinfection treatment, and finally clear water that can be used is obtained.

[0003] However, with the gradual improvement of existing health standards, new requirements for the quality of tap water such as 2-methylisoborneol and geosmin have been added. The conventional processes adopted by many waterworks at present have unsatisfactory treatment effects on 2-methylisoborneol and geosmin. Secondly, there are also problems such as when algae grow and sedimentation effect is poor, the filter tank is prone to blockage or high-frequency backwashing. Organics in the water treatment process of the waterworks produce disinfection by-products after disinfection. The wastewater from the backwashing of the filter tank in the waterworks flows back, and the pollutants in the backflow water circulate, deteriorating the quality of the tap water discharged. After the sludge water discharged from the waterworks is separated by mud-water separation, the wastewater is directly discharged into the sewage pipe network, wasting water resources. Usually, for waterworks adopting the air flotation process, it is difficult to reduce the moisture content of the air flotation sludge. Therefore, it is necessary to design an auxiliary process for improving the water resource utilization rate in a waterworks for producing tap water to solve the above problems. Summary of the Invention

[0004] In view of the above problems, the present invention provides an auxiliary process for improving the water resource utilization rate in a waterworks for producing tap water to solve the problems set forth in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solutions: including the following steps:

[0006] An auxiliary process for improving the water resource utilization rate in a waterworks for producing tap water, including the following steps:

[0007] Step S1, subjecting the raw water to flocculation sedimentation to form sludge water for discharge and water to be filtered;

[0008] Step S2, inputting the water to be filtered into the filter tank, filtering the water to be filtered to form filtered water and backwashing water, inputting the backwashing water into the backwashing recycled water tank, using the air flotation system in the backwashing recycled water tank to convert the backwashing water into clear liquid and scum, inputting the clear liquid into mixing with the raw water, and using the air flotation system in the filter tank to treat the filtered water;

[0009] Step S3, inputting the sludge water for discharge into the sludge discharge tank, using the air flotation system in the sludge discharge tank to convert the sludge water for discharge into clear liquid, sludge, and scum, and mixing the clear liquid with the raw water.

[0010] Further, the air flotation system in the filter tank includes a micro-nano dissolved air system, a surface flushing system, a scum removal system, and a deep treatment system for algae and organic matter.

[0011] Further, the air flotation system in the backwash reuse water tank includes a micro-nano dissolved air system, a surface flushing system, a scum removal system, and a deep treatment system for algae and organic matter.

[0012] Further, the air flotation system in the sludge discharge tank includes a micro-nano dissolved air system, a surface flushing system, a scum removal system, and a deep treatment system for algae and organic matter.

[0013] Further, the deep treatment system for algae and organic matter contains an ultrasonic device.

[0014] Further, step S1 further includes: adding a flocculant to the raw water, precipitating the raw water to form sludge water and water to be filtered.

[0015] Further, step S3 includes:

[0016] Step S31, converting the sludge water in the sludge discharge tank into clear liquid and sludge, and inputting the clear liquid into the filter tank;

[0017] Step S32, inputting the sludge into the thickening tank for thickening first, and then dehydrating to form a sludge cake;

[0018] Step S33, transporting the sludge cake out.

[0019] Further, step S31 further includes adding an oxidant to the sludge discharge tank.

[0020] The technical effects and advantages of the present invention:

[0021] 1. By arranging a micro-nano dissolved air system, a surface flushing system, a scum removal system, and a deep treatment system for algae and organic matter in the filter tank, the light suspended solids and algae substances in the water to be filtered can be reduced, the impurities in the water body can be reduced, the clogging speed of the filter tank can be slowed down, and the backwash cycle of the filter tank can be improved.

[0022] 2. The bubbles generated by the micro-nano dissolved air system have an oxygenation ability, which is beneficial to the growth of aerobic microorganisms, can improve the biochemical effect, and is beneficial to the removal of organic matters and odor substances such as 2-methylisoborneol and geosmin.

[0023] 3. By performing air flotation treatment on the backwash water through the micro-nano dissolved air system, the organic matter content and algae substance content of the recycled clear liquid will be significantly reduced, greatly reducing the risk of the generation of disinfection by-products.

[0024] 4. The micro-nano air dissolved system generates micro-nano bubbles with cavitation effect, which can produce hydroxyl radicals in water molecules and have strong oxidation performance on organic substances and algae, and can help concentrate the scum.

[0025] Other features and advantages of the present invention will be described in the following specification, and in part will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 Shows a schematic structural diagram of the air flotation system according to an embodiment of the present invention;

[0028] Figure 2 Shows a schematic structural diagram of the filter tank according to an embodiment of the present invention;

[0029] Figure 3 Shows a flowchart comparison of the backwash water treatment and the flowchart after adding air flotation according to an embodiment of the present invention;

[0030] Figure 4 Shows a flowchart comparison of the sludge water treatment and the flowchart after adding air flotation according to an embodiment of the present invention;

[0031] Figure 5 Shows a flowchart of the auxiliary process for improving the water utilization rate of the water treatment in a waterworks according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0033] As Figure 5 shown, an auxiliary process for improving the water utilization rate of the water treatment in a waterworks includes the following steps:

[0034] Step S1: Coagulate and precipitate the raw water to form sludge water and water to be filtered.

[0035] Step S2: Input the water to be filtered into the filter tank, filter the water to be filtered to form filtered water and backwash water, input the backwash water into the backwash recycled water tank, use the air flotation system in the backwash recycled water tank to convert the backwash water into clear liquid and scum, input the clear liquid into the mixture with the raw water, and use the air flotation system in the filter tank to treat the filtered water.

[0036] Step S3: Input the sludge water into the sludge tank, use the air flotation system in the sludge tank to convert the sludge water into clear liquid, sludge and scum, and mix the clear liquid with the raw water.

[0037] Specifically, step S2 further includes disinfecting the filtered water to obtain recycled water.

[0038] In this embodiment, by arranging an air flotation system in the filter tank, it can be used to remove light suspended solids and algae in the water to be filtered. By arranging an air flotation system in the backwash recovery water tank, light suspended solids and algae in the backwash water can be removed, and the treated clear liquid can be used as recycled water for tap water. By arranging an air flotation system in the sludge tank, the clear liquid, scum and sludge in the sludge water are separated, and the treated clear liquid can be used as recycled water for tap water.

[0039] Thus, the light suspended solids and algae in the water to be filtered can be reduced, and the backwash cycle of the filter tank can be extended. The organic components and algae components contained in the light suspended solids are exactly the sources of disinfection by-products and odors, and are prone to generate disinfection by-products and odor substances in the case of chlorine disinfection. With the reduction of such substances, the generation of disinfection by-products and odors can be reduced.

[0040] Optionally, as Figure 1 and Figure 2 shown, the air flotation system in the filter tank includes a micro-nano dissolved air system, a surface flushing system, a scum removal system and a deep treatment system for algae and organic matter.

[0041] In this embodiment, by arranging a micro-nano dissolved air system, a surface flushing system, a scum removal system and a deep treatment system for algae and organic matter in the filter tank, the light suspended solids and algae in the water to be filtered can be reduced, the impurities in the water body can be reduced, the clogging speed of the filter tank can be slowed down, and the backwash cycle of the filter tank can be improved.

[0042] The extension of the backwashing cycle of the filter is beneficial to the growth of the microbial community in the filter sand layer and conducive to improving the biochemical effect of the sand filter. The extension of the backwashing cycle of the filter is beneficial to the growth of the microbial community in the filter sand layer and enhances the biochemical effect in the sand filter; the cavitation effect of micro-nano bubbles can break long-chain organic substances into short-chain organic substances, which is more conducive to the biochemical effect; the bubbles generated by the micro-nano dissolved air system have an oxygenation ability, which is beneficial to the growth of aerobic microorganisms and can enhance the biochemical effect. The strengthening of the biochemical effect plays a huge role in removing organic substances and odor-causing substances, is beneficial to removing odor-causing substances such as 2-methylisoborneol and geosmin. It is beneficial to further improve the water quality to be filtered, extend the backwashing cycle of the filter, and save the water volume required for backwashing.

[0043] Optionally, as Figure 3 and Figure 5 shown, the air flotation system in the backwashing recycled water tank includes a micro-nano dissolved air system, a surface flushing system, a scum removal system, and a deep treatment system for algae and organic substances.

[0044] In this embodiment, usually all the backwashing water of the filter in the waterworks flows back, which is equivalent to the continuous circulation of residual organic substances and algae substances in the water, increasing the risk of the generation of disinfection by-products. Through the air flotation treatment of the backwashing water by the micro-nano dissolved air system, the content of organic substances and algae substances in the recycled clear liquid will be significantly reduced, and even the algae substances are basically all removed, greatly reducing the risk of the generation of disinfection by-products.

[0045] Optionally, as Figure 4 and Figure 5 shown, the air flotation system in the sludge discharge tank includes a micro-nano dissolved air system, a surface flushing system, a scum removal system, and a deep treatment system for algae and organic substances.

[0046] Specifically, in the existing process, the sludge discharge water is usually directly input into the sludge discharge tank and then concentrated and dewatered. The main reason why this part of the water cannot be reused is that the content of organic components and algae substances is relatively high.

[0047] In this embodiment, by arranging a micro-nano dissolved air system, a surface flushing system, a scum removal system, and a deep treatment system for algae and organic substances in the sludge discharge tank, the high-content organic components and algae substances in the sludge discharge water are removed, so that the sludge discharge water can be reused. The sludge discharge water after air flotation treatment is recycled to the conventional treatment end for re-treatment, improving the utilization of water resources in the waterworks. The discharged scum is concentrated by the deep treatment system for algae and organic substances.

[0048] The scum water collected by the three scum removal systems all enters the advanced treatment system for algae and organic matter. The scum water is subjected to air flotation concentration in this system. The concentrated scum contains high concentrations of organic matter and algae. During the air flotation process, the micro-nano bubbles have a cavitation effect, generating hydroxyl radicals, which have relatively strong oxidation performance on these substances and can help with scum concentration. If the reuse of the clarified liquid is considered in this step, an appropriate amount of flocculant or surfactant can be added to achieve higher air flotation concentration efficiency.

[0049] Secondly, the advanced treatment system for algae and organic matter conducts air flotation concentration on the scum water. The concentrated scum contains high concentrations of organic matter and algae. During the air flotation process, the micro-nano bubbles generated by the micro-nano dissolved air system have a cavitation effect, causing water molecules to generate hydroxyl radicals, which have relatively strong oxidation performance on organic matter and algae and can help with scum concentration.

[0050] In addition, due to the mandatory implementation of drinking water quality standards for indicators such as odor-causing substances, such substances and disinfection by-products have become key indicators in the industry. Installing short-range and high-efficiency micro-nano air flotation systems in filter pools, backwash recovery water tanks, and sludge discharge pools has the advantages of small investment, quick results, intuitive operation effects, and more guaranteed effluent water quality, and is worthy of being widely promoted and applied.

[0051] Optionally, the advanced treatment system for algae and organic matter contains an ultrasonic device.

[0052] In this embodiment, the ultrasonic device and the micro-nano dissolved air system have similar functions and stronger functions. Through the cavitation effect of ultrasonic waves, water molecules generate hydroxyl radicals, which have relatively strong oxidation performance on organic matter and algae and can help with scum concentration. And ultrasonic waves can destroy the cells of organic matter and algae to assist in dehydration.

[0053] Optionally, step S1 further includes: adding a flocculant to the raw water, precipitating the raw water to form sludge water and water to be filtered.

[0054] In this embodiment, by adding a flocculant, the flocculant can be aluminum salts and iron salts, which are used to adsorb small particles in the raw water and make them precipitate.

[0055] Optionally, step S3 includes:

[0056] Step S31, converting the sludge water in the sludge discharge pool into clarified liquid and sludge, and inputting the clarified liquid into the filter pool;

[0057] Step S32, inputting the sludge into the thickening pool for thickening first, and then dehydrating it to form a sludge cake;

[0058] Step S33, transporting the sludge cake out.

[0059] In this embodiment, by adding polyacrylamide strong coagulant to the sludge and then inputting the sludge into a centrifuge for dehydration, the sludge and water are separated, enabling the sludge to form a mud cake, which facilitates the transportation and treatment of the sludge.

[0060] Optionally, step S31 further includes adding an oxidizing agent into the sludge discharge tank.

[0061] In this embodiment, by adding an oxidizing agent into the sludge discharge tank, the organic matter and algal substances are further oxidized. It can also destroy the cell walls. By repeatedly damaging the cell walls, the water inside the cells is released, helping the sludge in the sludge discharge tank to dehydrate.

[0062] Specifically, the oxidizing agent can be a strongly oxidizing substance that is acidic or alkaline, such as potassium permanganate, etc. These strong oxidants can further oxidize organic matter, microorganisms, and algae, destroy the cell walls of cells to release the water inside the cells, and help with dehydration. The finally formed scum sludge close to inorganicization is then sent to the dehydration workshop for dehydration, pressure filtration, or drying, which will improve the degree of sludge dehydration, reduce the moisture content of the sludge, and save energy and reduce consumption.

[0063] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An auxiliary process for improving the water resource utilization rate in the water production of a waterworks, characterized in that, It includes the following steps: Step S1: Flocculate and precipitate the raw water to form sludge water and water to be filtered; Step S2: Input the water to be filtered into the filter tank, filter the water to be filtered to form filtered water and backwash water, input the backwash water into the backwash reuse water tank, use the air flotation system in the backwash reuse water tank to convert the backwash water into clear liquid and scum, input the clear liquid into the mixture with the raw water, and use the air flotation system in the filter tank to treat the filtered water; Step S3: Input the sludge water into the sludge tank, use the air flotation system in the sludge tank to convert the sludge water into clear liquid, sludge and scum, and mix the clear liquid with the raw water.

2. The auxiliary process for improving the water resource utilization rate in the water production of a waterworks according to claim 1, wherein, The air flotation system in the filter tank includes a micro-nano dissolved air system, a surface flushing system, a scum removal system and a deep treatment system for algae and organic matter.

3. The auxiliary process for improving the water resource utilization rate in the water production of a waterworks according to claim 2, characterized in that, The air flotation system in the backwash reuse water tank includes a micro-nano dissolved air system, a surface flushing system, a scum removal system and a deep treatment system for algae and organic matter.

4. The auxiliary process for improving the water resource utilization rate in the water treatment of a waterworks according to claim 3, characterized in that, The air flotation system in the sludge tank includes a micro-nano dissolved air system, a surface flushing system, a scum removal system and a deep treatment system for algae and organic matter.

5. The auxiliary process for improving the water resource utilization rate in the water treatment of a waterworks according to claim 4, characterized in that, The deep treatment system for algae and organic matter contains an ultrasonic device.

6. The auxiliary process for improving the water resource utilization rate in the water production of a waterworks according to claim 1, wherein Step S1 further includes: adding a flocculant to the raw water, precipitating the raw water to form sludge water and water to be filtered.

7. The auxiliary process for improving the water resource utilization rate in the water treatment of a waterworks according to claim 6, characterized in that, Step S3 includes: Step S31: Convert the sludge water in the sludge tank into clear liquid and sludge, and input the clear liquid into the filter tank; Step S32: Input the sludge into the thickening tank for thickening first, and then dehydrate it to form a sludge cake; Step S33: Transport the sludge cake out.

8. The auxiliary process for improving the water resource utilization rate in water production of a waterworks according to claim 7, characterized in that, Step S31 further includes adding an oxidant to the sludge tank.

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