High-performance biological filler for advanced treatment of sewage and preparation method thereof

Abstract

The present application relates to a kind of sewage advanced treatment high-performance biological filler and its preparation method, the biological filler includes nitrogen removal component, phosphorus removal component, inorganic carbon source component, active component, 2-5 parts filler reinforcing component, rare element component, pore-forming agent.The sewage advanced treatment high-performance biological filler of the present application does not need any organic adhesive agent and pore-forming agent, can simultaneously realize autotrophic denitrification, chemical phosphorus removal, heavy metal adsorption passivation, microorganism adsorption biofilm formation and other multiple functions, the physical property of filler is better, sewage treatment effect is significantly improved, and greatly reduces processing cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of biological fillers for sewage treatment, in particular to a high-performance biological filler for advanced sewage treatment and a preparation method thereof. BACKGROUND

[0002] The main purpose of advanced sewage treatment is to remove nitrogen, and at the same time, to remove phosphorus, SS, heavy metals and color. The current denitrification process of sewage treatment plant is mainly through biological nitrification + denitrification to convert nitrogen pollutants in wastewater into nitrogen gas and discharge from the wastewater system. Traditional denitrification is to use heterotrophic microbial flora to reduce nitrate nitrogen by using organic carbon as an electron donor. The reaction process needs to consume carbon source. For the treatment of low-carbon high-nitrogen wastewater, due to the low content of organic matter, additional organic carbon source needs to be added in the traditional denitrification process to meet the demand of electron donor for heterotrophic denitrification. Adding carbon sources such as methanol, sodium acetate, glucose to achieve denitrification, on the one hand, there is a problem of insufficient or excessive carbon source addition affecting the water quality of the effluent and possibly causing secondary pollution, on the other hand, it also increases the operation cost. Sulfur autotrophic denitrification technology is a biological denitrification using reduced sulfur such as S 2- , S2O3 2- and SO3 2- as electron donor and inorganic carbon such as CO3 2- as carbon source. Sulfur autotrophic denitrification has been gradually applied to the purification of low carbon-nitrogen ratio water quality such as groundwater, aquaculture effluent, municipal sewage and industrial wastewater due to its advantages of not needing to add organic carbon source, low operation cost and low sludge yield.

[0003] Currently, sulfur autotrophic denitrification substrates for biological denitrification mainly use sulfur or sulfide. Since both are water-insoluble, in the process of biological denitrification sulfur autotrophic denitrification, one technology is to place sulfur or sulfide in a fixed bed reactor, but using a fixed bed reactor for sulfur autotrophic denitrification inevitably has problems such as easy clogging of the bed, large water head loss and low denitrification efficiency. Another technology is to load sulfur on the surface of the filler used for sewage or surface water purification by high-temperature melting, but this technology needs special melting equipment to complete the coating loading under high-temperature conditions, and the sulfur coating formed after loading is brittle and easy to crack, greatly increasing the operation difficulty and the preparation cost of the sulfur coating. At the same time, due to the limited process conditions of the melting method, many substrates required by the sulfur autotrophic denitrification process cannot be added to the inside of the filler through the production process, which also reduces the denitrification efficiency of the process. At the same time, although the existing fillers have various types, they do not fully consider the various types of nutrient substrates required by sulfur autotrophic microorganisms for metabolism, and lack the function of other demands for sewage treatment (removal of phosphorus, heavy metals, SS, etc.), further limiting the use range and efficiency of the filler.

[0004] In the existing sewage treatment technology, CN113697950A is used by coating the substrate required for sulfur autotrophic denitrification on the carrier for sewage treatment or surface water purification after hydration treatment to form a substrate coating, which brings a great workload to the operators of the sewage treatment facility, and the coating type filler needs to be filled frequently, further increasing the cost and difficulty of project operation. At the same time, the formula lacks various trace elements and inorganic carbon source components required by sulfur autotrophic microorganisms, which greatly limits the microbial activity and reduces the denitrification and phosphorus removal efficiency of the system.

[0005] CN116715357A is combined by combining a plurality of media and sulfur base values in a multi-layer stacking manner to form a composite filler. However, this filler production method will cause the proportion of inert components in the filler to be relatively high, the service life of the filler to be greatly reduced, and the production process to be too complex, and the quality stability of the filler product to be low. At the same time, the filler formula also lacks various trace elements and inorganic carbon source components required by sulfur autotrophic microorganisms, which limits the efficiency of the process.

[0006] CN116813079A is mixed by a chemical binder, and then granulated by a melting method. However, the binder polyvinyl acetate and sodium alginate used in this technology are expensive chemical agents, which will greatly increase the production cost of the filler. And the inorganic carbon source component used in this process is calcium carbonate, which may cause serious filler surface structure phenomenon in the future, and ultimately affect the actual denitrification efficiency of the process.

[0007] In CN116332344A, micro-electrolysis materials (activated carbon and reduced iron powder) and sulfur autotrophic denitrification base values are filled in polyurethane sponge foam for drying treatment and molding. However, the filler has weak physical properties, and the filler is prone to damage and loss in actual production and use, and the proportion of inert components is relatively high, and the consumption period of the substrate required for sulfur autotrophy is very short, which further limits the use range of the filler.

[0008] Therefore, how to solve the defects existing in the prior art is a difficult problem that needs to be solved at present. SUMMARY

[0009] In order to overcome the shortcomings of the prior art, the present application provides a high-performance biological filler for advanced sewage treatment, which can realize autotrophic denitrification, chemical phosphorus removal, heavy metal adsorption and passivation, and microbial adsorption and biofilm formation at the same time, and greatly reduces the treatment cost while ensuring the sewage treatment effect.

[0010] Specifically, the present application provides the following technical solutions:

[0011] An aspect of the present application provides a high-performance biological filler for advanced sewage treatment, characterized in that it comprises, by weight, 70-85 parts of a denitrification component, 5-10 parts of a phosphorus removal component, 3-10 parts of an inorganic carbon source component, 1-2 parts of an activity component, 2-5 parts of a filler enhancement component, 1 part of a rare element component, and 1-2 parts of a pore-forming agent.

[0012] In some embodiments, the denitrification component comprises sulfur.

[0013] In some embodiments, the phosphorus removal component comprises ferrous carbonate and ferrous sulfate, and the mass ratio of the ferrous carbonate to the ferrous sulfate is 10:1.

[0014] In some embodiments, the inorganic carbon source component comprises magnesium carbonate and calcium carbonate, and the mass ratio of the magnesium carbonate to the calcium carbonate is 2:1.

[0015] In some embodiments, the activity component comprises ferric oxide, reduced iron powder, and activated carbon, and the mass ratio of the ferric oxide to the reduced iron powder to the activated carbon is 3:1:1.

[0016] In some embodiments, the filler enhancement component comprises rice straw, loofah capsules, and rice hull powder, and the mass ratio of the rice straw to the loofah capsules to the rice hull powder is 1:1:2.

[0017] In some embodiments, the rare element component is an aqueous solution comprising zinc sulfate, cobalt chloride, sodium selenate, sodium molybdate, manganese chloride, and boric acid, and the mass fraction of the rare elements is 5 ‰.

[0018] In some embodiments, the pore-forming agent comprises sodium bicarbonate.

[0019] Another aspect of the present application provides a preparation method of the high-performance biological filler for advanced sewage treatment, characterized in that the preparation method comprises the following steps:

[0020] Step 1: processing all solid components of the biological filler into a powder with a particle size of 100-200 mesh;

[0021] Step 2: mixing the components obtained in step 1 except the pore-forming agent to obtain a mixed raw material;

[0022] Step 3: putting the mixed raw material obtained in step 2 into a reactor, heating to 120-140°C for mixing and melting, and maintaining an anaerobic state in the reactor during the process;

[0023] Step 4: putting the pore-forming agent into the mixed and melted material, stirring rapidly for 15-30 seconds at a stirring rate of 150-300 rpm, and maintaining a material temperature of 120-140°C and an anaerobic state during the process;

[0024] Step 5: The material in the reactor is discharged for cooling and granulation treatment;

[0025] Step 6: The granules of the filler after cooling and screening are aged for 1-2 days; the aged filler granules can be packaged and stored.

[0026] In some embodiments, the cooling and granulation treatment in step 5 is selected from water cooling direct forming or inverted plate air cooling.

[0027] Compared with the prior art, the advantages and positive effects of the present application are:

[0028] The sewage advanced treatment high-performance biological filler of the present application does not need any organic adhesive and pore-forming agent, can realize autotrophic denitrification, chemical phosphorus removal, heavy metal adsorption and passivation, and microbial adsorption and biofilm formation at the same time, uses mixed iron source (ferrous carbonate and ferrous sulfate) as the sewage phosphorus removal component; uses mixed inorganic carbon source (magnesium carbonate and calcium carbonate) to provide the necessary alkalinity for sewage treatment; uses plant straw powder combination (rice straw, silk gourd capsule and rice hull powder combination) to increase the physical properties of the filler; and adds water-soluble rare element component, which can provide the necessary carbon source and trace elements for microbial metabolism while removing nitrogen and phosphorus, has better physical properties of the filler, significantly improves the sewage treatment effect, and greatly reduces the treatment cost. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] Example 1: Sewage advanced treatment high-performance biological filler

[0031] The sewage advanced treatment high-performance biological filler mainly realizes autotrophic denitrification, chemical phosphorus removal, heavy metal adsorption and passivation, and microbial adsorption and biofilm formation by combining multiple chemical components, and further removes the residual pollutants in the tail water (usually the sewage of the secondary sedimentation tank) after the conventional sewage treatment process. The formula of the biological filler is shown in the following table:

[0032]

[0033]

[0034] Example 2: Sewage advanced treatment high-performance biological filler

[0035] The high-performance biological packing material for advanced wastewater treatment of the present invention comprises, by weight: 80 parts denitrification component, 6 parts phosphorus removal component, 7 parts inorganic carbon source component, 2 parts active component, and 3 parts...

[0036] The composition consists of a filler reinforcement component, 1 part rare element component, and 1 part pore-forming agent.

[0037]

[0038]

[0039]

[0040] Example 3: High-performance biological packing material for advanced wastewater treatment

[0041] The high-performance biological packing material for advanced wastewater treatment of the present invention comprises, by weight: 72 parts denitrification component, 10 parts phosphorus removal component, 8 parts inorganic carbon source component, 2 parts active component, and 5 parts...

[0042] The composition consists of a filler reinforcement component, 1 part rare element component, and 2 parts pore-forming agent.

[0043]

[0044]

[0045] Example 4: High-performance biological packing material for advanced wastewater treatment

[0046] The high-performance biological packing material for advanced wastewater treatment of the present invention comprises, by weight: 85 parts denitrification component, 5 parts phosphorus removal component, 5 parts inorganic carbon source component, 1 part active component, and 2 parts...

[0047] The composition consists of a filler reinforcement component, 1 part rare element component, and 1 part pore-forming agent.

[0048]

[0049]

[0050] Example 4: Preparation method of high-performance biological packing material for advanced wastewater treatment. The preparation method of high-performance biological packing material for advanced wastewater treatment includes the following steps:

[0051] 1) All solid formulation components are processed into 100-200 mesh powder through physical grinding and sieving;

[0052] 2) This formula does not require adding each component in separate steps for production. Simply mix all the components mentioned in step 1) except for the pore-forming agent. The mixing is done by physical stirring at a speed of 30-100 rpm for 5-10 minutes to obtain the mixed raw materials.

[0053] 3) Put the mixed raw materials obtained in step 2) into a reactor, heat to 120-140℃ for mixing and melting, the mixing time required is 10-20 minutes, continue stirring and the stirring rate is 60-180 rpm, and the reaction is required to be kept in an anaerobic state (which can be achieved by vacuum pumping and nitrogen blowing) during the process;

[0054] 4) Put the pore-forming agent into the mixed and melted material, stir quickly for 15-30 seconds and the stirring rate is 150-300 rpm, and the material temperature is maintained at 120-140℃ and the anaerobic state is maintained during the process;

[0055] 5) The material in the reactor is discharged for cooling and granulation treatment, and there are two methods for cooling treatment: water cooling direct forming and air cooling by inverted plate. The water cooling treatment method is: the molten material obtained in step 4) is directly formed into droplets through a screen with a pore size of 1-3 mm into 10-20℃ cooling water (tap water can be used) for rapid forming, and the filler particles after forming are sieved to obtain 2-5 mm filler particles. The air cooling method by inverted plate is: the molten material obtained in step 40 is directly introduced into a steel mold (size: 100 cm*100 cm*5 cm) for room temperature cooling, and the cooling time is 30-45 minutes. The cooled material is physically broken, and the impact breaking process is selected, and the particles with a particle size of 2-5 mm are selected as the finished product. The undersize and oversize of the above two cooling treatments are used as production raw materials and returned to the reactor in step 3);

[0056] 6) The filler particles after cooling treatment and sieving are aged for 1-2 days. The aged filler particles can be packaged and stored.

[0057] Example 3 Application of the sewage advanced treatment high-performance biological filler of the application in actual sewage treatment

[0058] Case 1, using the sewage advanced treatment high-performance biological filler of example 2, sewage pilot test data of a sewage plant in Longyan City (running for 40 days on average)

[0059]

[0060] The advanced treated sewage has significantly improved in various indicators (total nitrogen, total phosphorus and SS), and the effluent water quality is stable and reliable, and the treatment cost is estimated to be about 0.07 yuan / m 3 , and has realized unmanned intelligent management.

[0061] Case 2, using the sewage advanced treatment high-performance biological filler of example 3, sewage advanced treatment pilot test of a mine wastewater in Shanghang County, Longyan City (running for 90 days on average)

[0062]

[0063] The sewage after deep treatment has a significant improvement in various indicators (total nitrogen, total phosphorus and SS), the concentration of heavy metal pollutants in the effluent is extremely low and meets the industry discharge requirement standard, and the treatment cost is estimated to be about 0.09 yuan / m 3 .

[0064] Case 3, using the sewage deep treatment high-performance biological filler of embodiment 4, field data of Xiamen City Lake open water ecological restoration project (mean value of 135 days of operation)

[0065]

[0066]

[0067] The water quality of the treated lake water is significantly improved, the pollutant concentration is obviously decreased, and the color and odor of the effluent are also improved to a certain extent, so that the sewage deep treatment high-performance biological filler can be used as an auxiliary means for surface water ecological restoration to control the influence of the surface pollution source on the ecological system.

[0068] In summary, the sewage deep treatment high-performance biological filler has a significant improvement in sewage treatment effect and greatly reduces the treatment cost.

[0069] Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration, but not for limiting the scope of the present application. Those skilled in the art should also understand that various modifications can be made to the embodiments without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A high-performance biological packing material for deep wastewater treatment, characterized in that, This biological packing material is composed of denitrification components, phosphorus removal components, inorganic carbon source components, active components, packing reinforcement components, rare element components, and pore-forming agents. By weight, it includes: 70-85 parts denitrification components, 5-10 parts phosphorus removal components, 3-10 parts inorganic carbon source components, 1-2 parts active components, 2-5 parts packing reinforcement components, 1 part rare element components, and 1-2 parts pore-forming agents. The denitrification component includes sulfur; The phosphorus removal component includes ferrous carbonate and ferrous sulfate, and the mass ratio of ferrous carbonate to ferrous sulfate is 10:

1. The inorganic carbon source components include magnesium carbonate and calcium carbonate, wherein the mass ratio of magnesium carbonate to calcium carbonate is 2:

1. The active components include iron oxide, reduced iron powder, and activated carbon, and the mass ratio of iron oxide, reduced iron powder, and activated carbon is 3:1:

1. The filler reinforcement component includes rice straw, loofah sponge, and rice husk powder, and the mass ratio of rice straw, loofah sponge, and rice husk powder is 1:1:

2. The rare element component is an aqueous solution comprising zinc sulfate, cobalt chloride, sodium selenate, sodium molybdate, manganese chloride, and boric acid, wherein the mass fraction of the rare element is 5‰. The pore-forming agent includes sodium bicarbonate.

2. The method for preparing the high-performance biological packing material for advanced wastewater treatment according to claim 1, characterized in that, The preparation method includes the following steps: Step 1: Process all solid components of the biological filler into 100-200 mesh powder; Step 2: Mix the components from Step 1 except for the pore-forming agent to obtain a mixed raw material; Step 3: Add the mixed raw materials obtained in Step 2 into the reactor, heat to 120-140℃ for mixing and melting, and maintain an anaerobic state in the reaction during the process; Step 4: Add the pore-forming agent to the already mixed and melted material, stir rapidly for 15-30 seconds at a stirring speed of 150-300 rpm, and maintain the material temperature at 120-140℃ and the anaerobic state during this period; Step 5: Remove the material from the reactor for cooling and granulation. Step 6: After cooling and screening, the filler particles are aged for 1-2 days; the aged filler particles are then packaged and sealed.

3. The preparation method according to claim 2, characterized in that, In step 5, the cooling granulation process is selected from water-cooled direct molding or inverted plate air cooling.

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