Sewage treatment station medicament adding method and system

Abstract

The invention discloses an agent adding method and system for a sewage treatment station, and the method comprises the steps: feeding collected sewage into a pipeline, enabling various agents to reach the optimal ratio, and enabling the various agents to be sequentially mixed and reacted with the various agents, so that the discharged water quality reaches the standard for reuse or is directly discharged; according to the invention, the dosing modes of various medicaments are optimized, the minimum medicament dosage is realized under the condition of realizing up-to-standard discharge, and medicaments which are cheaper and have the same effect are found and tested to replace a heavy metal capturing agent and a dry powder flocculating agent.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, in particular to a method and system for adding reagents to a sewage treatment station. Background Art

[0002] The characteristics of the shipbuilding industry include labor-intensive, investment-intensive, long production cycle, high industrial correlation, high resource and energy consumption, and great impact on the environment. Shipbuilding companies will produce many pollutants such as sewage, dirty oil, waste gas, solid waste, etc. during shipbuilding, ship repair and ship dismantling. Among them, wastewater is mainly oily sewage and domestic sewage, and there is a small amount of equipment cleaning sewage. The chemicals used for sewage treatment in shipyards mainly include polyaluminum chloride, polyacrylamide, sodium hydroxide, phosphorus removal agent, soda ash, glucose, heavy metal capture agent, dry powder flocculant, lime, etc., which are used for biochemical bacterial culture, chemical precipitation, and physical flocculation. Due to the complex working conditions of the shipyard, with the renewal of raw and auxiliary materials in the workshop, the composition of wastewater changes every year. Therefore, for the existing sewage process, it is necessary to adjust the dosage of the chemical in a timely manner according to the composition of the wastewater to find the most suitable ratio and save costs and innovate. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is that the cost of treating sewage is high and the proportion is not suitable.

[0004] The above technical problems are solved by the following technical solutions: The present invention proposes a method for adding reagents to a sewage treatment station, which includes sending sewage into a pipeline; mixing reagents according to the amount of sewage, and adding the mixed reagents to the sewage for pollution control; detecting the sewage after pollution control to obtain detection information; and adjusting the flow direction of the sewage according to the detection information.

[0005] In a preferred embodiment of the method for adding reagents to a sewage treatment station of the present invention: the reagents mainly include polyaluminium chloride, polyacrylamide, sodium hypochlorite, and liquid alkali.

[0006] In a preferred embodiment of the method for adding reagents to a sewage treatment station of the present invention, the collected sewage is sent into a pipeline, and before being mixed with various reagents in sequence for reaction, various reagents are prepared, which includes:

[0007] Add 10 kg of polyaluminium chloride to each ton of water to prepare aluminium chloride agent;

[0008] Add 5 kg of polyacrylamide per ton of water to prepare a polyacrylamide agent;

[0009] Prepare 1 ton of sodium hypochlorite and mix it with water to form a sodium hypochlorite agent, and keep it in a dark environment;

[0010] Prepare 10 tons of liquid alkali and mix it with water to form a liquid alkali agent, and keep it in a light-proof environment.

[0011] In a preferred embodiment of the method for adding reagents to a sewage treatment station of the present invention: the concentration of the polyaluminium chloride is above 28%, the content of the qualified polyacrylamide is above 88%, and the concentration of the sodium hypochlorite is 13%.

[0012] In a preferred embodiment of the method for adding reagents to a sewage treatment station of the present invention: the concentration of the liquid alkali is 30%, and the concentration of the liquid alkali can be changed according to the pH value of water.

[0013] In a preferred embodiment of the method for adding reagents to a sewage treatment station of the present invention: the polyaluminium chloride and the polyacrylamide are both in the form of solid powders.

[0014] The present invention also proposes a sewage treatment station chemical dosing system, the above-mentioned sewage treatment station chemical dosing method; it includes a discharge mechanism for conveying collected sewage; a sedimentation integrated mechanism, which is provided with two, each internally loaded with a polyaluminium chloride dosing device and a polyacrylamide dosing device, having an input end and an output end, the input end being connected to the discharge mechanism; a filtering mechanism, which is arranged at the output end of the sedimentation integrated mechanism; a decontamination mechanism for discharging deposited sludge and an output mechanism for discharging treated water.

[0015] In a preferred embodiment of the sewage treatment station agent dosing system of the present invention: the filtering mechanism includes a filtering pump arranged between the two integrated sedimentation mechanisms, and the output ends of the integrated sedimentation mechanisms are each provided with a fiber filtering device.

[0016] In a preferred embodiment of the sewage treatment station agent dosing system of the present invention: the output mechanism includes a reuse water tank arranged at one end of the fiber filtering device, a backwash pump arranged at one end of the reuse water tank, and an overflow drain pipe arranged at the other end of the reuse water tank.

[0017] In a preferred embodiment of the sewage treatment station agent dosing system of the present invention: the decontamination mechanism includes a sludge return pump at one end of the sedimentation integrated mechanism, and a sludge discharge pump arranged at one end of the sludge return pump.

[0018] The beneficial effects of the present invention are as follows: the addition method of polyaluminium chloride, polyacrylamide and sodium hypochlorite is optimized to replace heavy metal capture agents and dry powder flocculants, thereby achieving the minimum dosage of agents while achieving standard discharge, and adjusting the pH value in sewage with liquid alkali to ensure that the agents react in the best environment, thereby saving the dosage of the agents. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention are briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention. Among them:

[0020] Figure 1 An overall diagram of the system is shown;

[0021] Figure 2 The process pipeline plan layout of the system is shown. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with specific implementation methods and drawings.

[0023] The terms used in the present invention are those general terms currently widely used in the art in consideration of the functions of the present invention, but these terms may vary according to the intention of a person of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as a general description based on the meaning of the terms and the present invention.

[0024] Example 1

[0025] Reference Figure 1-2 , this embodiment provides a method for adding reagents to a sewage treatment station, including sending the collected sewage into a pipeline, making various reagents reach an optimal ratio, and mixing and reacting with various reagents in sequence, so that the discharged water meets the quality standards for reuse or direct discharge;

[0026] Preferably, the reagents are mainly polyaluminium chloride, polyacrylamide, sodium hypochlorite, and liquid alkali. Polyaluminium chloride is hydrolysed to produce Cl- and then reacts with phosphate ions to form aluminium phosphate precipitation. A larger precipitation is formed through the action of van der Waals force and net capture. Polyacrylamide is mixed with water to undergo hydrolysis and polycondensation reaction, which synergizes with polyaluminium chloride and forms larger and more stable flocs through bridging reaction adsorption. It has oxidative and chlorinative properties, which denatures bacteria and virus proteins and causes death.

[0027] Furthermore, the collected sewage is sent into a pipeline, and before being mixed with various reagents in turn for reaction, various reagents are prepared, including: dissolving 50 kg of polyaluminium chloride in 5 tons of water, sealing it away from light; dissolving 25 kg of polyacrylamide in 5 tons of water, sealing it away from light; preparing 1 ton of sodium hypochlorite and placing it indoors, protecting it from light and sealing the lid; preparing 10 liquid alkali and placing it indoors, protecting it from light and sealing the lid.

[0028] Furthermore, the concentration of polyaluminium chloride is above 28%, according to the "Water Treatment Agent Polyaluminium Chloride" GB15892-2022, and the content is above 28% for easy storage; the content of polyacrylamide is above 88% of qualified products, according to the "Water Treatment Agent Anionic and Non-ionic Polyacrylamide" GB / T 17514-2017, and the content of qualified products is above 88%; the concentration of sodium hypochlorite is 13%, and type A grade Ⅰ product is used according to the "Sodium Hypochlorite" GB19106-2013; the concentration of liquid alkali is 30%, which is used to adjust the pH value.

[0029] Example 2

[0030] Reference Figure 1-2 This embodiment is different from the above embodiments in that the concentration of liquid alkali can be changed according to the pH value of water. Since the pH value of water is between 6 and 7, which is not near the optimal reaction pH value of polyaluminium chloride and polyacrylamide of 8, liquid alkali is needed to adjust and increase the pH.

[0031] Optimized, polyaluminium chloride and polyacrylamide are stored in solid powder form, solid powder polyaluminium chloride is used. Since basic aluminium chloride and PFC polyferric chloride are dark in colour, if the addition is not precisely controlled, the chromaticity of the effluent is high. For easy storage, solid powder polyacrylamide is used. Anionic polyacrylamide is used. Polyaluminium chloride carries a positive charge after hydrolysis, and combines with anionic polyacrylamide to form larger flocs.

[0032] Example 3

[0033] Reference Figure 1 and Figure 2 , this embodiment is different from the above embodiment in that: this embodiment proposes a sewage treatment station agent dosing system, which is applied to the sewage treatment station agent dosing method in the above embodiment; it includes a discharge mechanism 100, which is used to transport the collected sewage; a sedimentation integrated mechanism 200, which is provided with two, each of which is internally loaded with a polyaluminium chloride dosing device and a polyacrylamide dosing device, and has an input end 201 and an output end 202, and the input end 201 is connected to the discharge mechanism 100; a filtering mechanism 300, which is provided at the output end 202 of the sedimentation integrated mechanism 200; a decontamination mechanism 400, which is used to discharge the deposited sludge; an output mechanism 500, which is used to discharge the treated water;

[0034] The integrated precipitation device 200 is a reagent reactor + sedimentation area, which has four mixers installed inside. The reagent and water are fully mixed and reacted by stirring. After the reaction, they continue to flow to the back, where an inclined tube filler is installed to help the suspended matter to settle quickly.

[0035] This is an integrated water treatment equipment filtration device. Polyaluminium chloride, polyacrylamide, sodium hypochlorite and liquid alkali are respectively packed in ton barrels. Only high-density precipitation integrated device is added through the dosing system (pump, agitator, pipe). We can adjust the dosage of our reagents by adjusting the size of the valve switch and the delivery rate of the pump. During this period, we need to observe and test the pH value and floc size of the water in the device to determine the dosage. This process can allow the suspended matter in the water to fully precipitate, reduce the total phosphorus and COD of the sewage, adjust the pH of the effluent, and settle heavy metals.

[0036] Specifically, the filtering mechanism 300 includes a filtering pump 301 arranged between two integrated sedimentation mechanisms 200. The output ends 202 of the integrated sedimentation mechanisms 200 are each provided with a fiber filtering device 302. There are two fiber filtering devices 202 at the back to filter the output water of the integrated device. If the water volume is large and the sedimentation effect is not good, there is still a large amount of suspended matter in the output water, which can be filtered out by the fiber filter.

[0037] Furthermore, the output mechanism 500 includes a reuse water tank 501 disposed at one end of the fiber filtering device 302 , a backwash pump 502 disposed at one end of the reuse water tank 501 , and an overflow drain pipe 503 disposed at the other end of the reuse water tank 501 .

[0038] Furthermore, the decontamination mechanism 400 includes a sludge return pump 401 at one end of the integrated sedimentation mechanism 200 , and a sludge discharge pump 402 disposed at one end of the sludge return pump 401 .

[0039] Finally, it should be pointed out that the methods and devices described in detail above are only embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A method for adding reagents to a sewage treatment station, characterized in that: include, Send sewage into pipes; Mix the reagents according to the amount of sewage. Mixed chemicals are added to sewage for pollution treatment; Detect the sewage after pollution control treatment to obtain detection information; Adjust sewage flow direction according to detection information.

2. The method for adding reagents to a sewage treatment plant according to claim 1, characterized in that: The reagents are polyaluminium chloride, polyacrylamide, sodium hypochlorite and liquid alkali.

3. The method for adding reagents to a sewage treatment plant according to claim 2, characterized in that: The collected sewage is sent into the pipeline and mixed with the reagents in turn for reaction, and then the reagents are prepared, which includes: Add 10 kg of polyaluminium chloride to each ton of water to prepare aluminium chloride agent; Add 5 kg of polyaluminium chloride per ton of water to prepare polyacrylamide agent; Prepare 1 ton of sodium hypochlorite and mix it with water to form a sodium hypochlorite agent, and keep it in a dark environment; Prepare 10 tons of liquid alkali and mix it with water to form a liquid alkali agent, and keep it in a light-proof environment.

4. The method for adding reagents to a sewage treatment station according to claim 3, characterized in that: The concentration of the polyaluminium chloride is more than 28%, the concentration of the polyacrylamide is more than 88%, and the concentration of the sodium hypochlorite is 13%.

5. The method for adding reagents to a sewage treatment station according to claim 4, characterized in that: The concentration of the liquid caustic soda is 30%.

6. The method for adding reagents to a sewage treatment station according to claim 5, characterized in that: The polyaluminium chloride and polyacrylamide are both in solid powder form.

7. A sewage treatment station reagent dosing system, characterized by: The method for adding reagents to a sewage treatment plant as claimed in claim 1; It includes, A discharge mechanism (100) for conveying the collected sewage; Two integrated precipitation mechanisms (200) are provided, each of which is internally loaded with a polyaluminium chloride dosing device and a polyacrylamide dosing device, and has an input end (201) and an output end (202), wherein the input end (201) is connected to the discharge mechanism (100); A filtering mechanism (300) disposed at the output end (202) of the integrated precipitation mechanism (200); A decontamination mechanism (400) for discharging sludge processed by the integrated sedimentation mechanism (200); The output mechanism (500) is used to discharge the water processed by the filtering mechanism (300).

8. The sewage treatment station reagent dosing system according to claim 7, characterized in that: The filtering mechanism (300) comprises a filtering pump (301) arranged between the two integrated sedimentation mechanisms (200), and the output ends (202) of the integrated sedimentation mechanisms (200) are each provided with a fiber filtering device (302).

9. The sewage treatment station reagent dosing system according to claim 8, characterized in that: The output mechanism (500) comprises a recycling water tank (501) arranged at one end of the fiber filtering device (302), a backwash pump (502) arranged at one end of the recycling water tank (501), and an overflow drain pipe (503) arranged at the other end of the recycling water tank (501).

10. The sewage treatment station reagent dosing system according to claim 9, characterized in that: The decontamination mechanism (400) comprises a sludge return pump (401) at one end of the integrated sedimentation mechanism (200), and a sludge discharge pump (402) arranged at one end of the sludge return pump (401).

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