Highly efficient integrated equipment for reducing treatment of perchlorate wastewater by biological method

Abstract

The application discloses a kind of high-efficiency integrated equipment for reducing treatment of perchlorate wastewater by biological method, comprising biological reduction reactor group, biological aeration reactor and set sedimentation filtration device connected in sequence, and the biological reduction reactor group is provided with at least one set of series-connected biological reduction reactor 1#, biological reduction reactor 2# and complete dosing device connected with biological reduction reactor 1# and biological reduction reactor 2# respectively, and the biological reduction reactor 1# is UASB reactor, and the biological reduction reactor 2# is ABR reactor.The above-mentioned equipment effectively buffers the impact of water quality, water quantity and temperature change by adopting two-stage biological reduction design of biological reduction reactor 1# and biological reduction reactor 2#, improves the overall tolerance and operation stability of the system, and in combination with biological aeration reactor and set sedimentation filtration device, ensures that the effluent not only meets the standard of perchlorate, but also meets the discharge requirements of other pollutants.

Description

Technical Field

[0001] This invention relates to the field of biological reduction treatment of perchlorate pollutants, and specifically to a highly efficient integrated device for biological reduction treatment of perchlorate wastewater. Background Technology

[0002] Perchlorate is a persistent pollutant of global concern, primarily originating from fireworks, industrial production, blasting, and military applications. Due to its recalcitrant nature, low volatility, high water solubility, and high diffusivity, perchlorate is often released into the environment through industrial wastewater discharge and readily enters the human body via water sources and the food chain, leading to serious health problems such as hypothyroidism and brain development disorders. Currently, the U.S. Environmental Protection Agency (EPA) limits perchlorate levels in drinking water to no more than 15 μg / L, while the World Health Organization (WHO) sets the limit at 70 μg / L. Therefore, my country's newly revised "Standards for Drinking Water Quality" (GB5749-2022) specifically adds a perchlorate limit of 70 μg / L to ensure drinking water safety. In provinces like Hunan and Jiangxi, where the fireworks industry is concentrated, perchlorate pollution in waterways is a serious problem. According to the latest national water pollution control survey report and the explanatory notes for the "Standards for Drinking Water Quality" (GB5749-2022), the detection rate of perchlorate in tap water in my country has reached 100%, with 28% of water samples exceeding the US EPA limit (15 μg / L). Several water plants exceeded the standard by 70 μg / L. The Yangtze River mainstream receives 6,700 tons of perchlorate discharge per year, and the average concentration of perchlorate in surface water and groundwater in the basin is 16.68 µg / L, with some monitoring points still frequently exceeding 100 μg / L.

[0003] With increasing environmental pressures, the treatment of perchlorate wastewater presents unprecedented challenges. While Hunan Province's "recycling and zero-discharge" policy has yielded significant short-term results, the concentration of perchlorate in industrial wastewater continues to rise, proving unsustainable in the long run and posing growing safety risks. Therefore, finding an effective technology to degrade perchlorate-polluted water bodies is urgently needed.

[0004] Studies have demonstrated that biological methods possess advantages such as economy, high efficiency, and minimal secondary pollution, making them a promising pathway for perchlorate degradation and reduction. However, achieving ideal results in the actual operation of biological perchlorate reduction equipment is challenging. This is not due to technological deficiencies, but rather to inappropriate processes. Some equipment performs well at low concentrations, but even slight increases in concentration lead to substandard effluent. Furthermore, changes in external temperature also affect the acidification effect. Therefore, it is necessary to provide a highly efficient integrated biological reduction treatment system for perchlorate wastewater that minimizes the impact on treatment capacity and ensures effluent compliance even under conditions of wastewater quality changes or sudden drops in external temperature. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a highly efficient integrated device for biological reduction treatment of perchlorate wastewater, solving the aforementioned traditional problems. It aims to address the technical issue of perchlorate wastewater treatment failing to meet standards when wastewater quality changes or when the ambient temperature drops sharply.

[0006] This invention is achieved using the following technical solution: A highly efficient integrated device for biological reduction treatment of perchlorate wastewater includes a biological reduction reactor group, a biological aeration reactor, and a sedimentation and filtration device connected in sequence. The biological reduction reactor group is equipped with at least one set of biological reduction reactor 1# and biological reduction reactor 2# connected in series, and a complete set of dosing devices connected to biological reduction reactor 1# and biological reduction reactor 2# respectively. Biological reduction reactor 1# is a UASB reactor and biological reduction reactor 2# is an ABR reactor.

[0007] Preferably, when the perchlorate concentration in the wastewater is ≤1000mg / L, the complete dosing device is used to add reagents to the unidirectional bioreduction reactor 1#, and the required dosage of the reagent is: COD equivalent: perchlorate mass ratio of (2-5):1; when the perchlorate concentration in the wastewater is >1000mg / L, the complete dosing device is used to simultaneously add reagents to bioreduction reactor 1# and bioreduction reactor 2#. In bioreduction reactor 1#, the required dosage of the reagent is: COD equivalent: perchlorate mass ratio of (4-5):1, and in bioreduction reactor 2#, the required dosage of the reagent is: COD equivalent: perchlorate mass ratio of (1-3):1.

[0008] Preferably, the ratio of reagent dosage in bioreduction reactor 1# to reagent dosage in bioreduction reactor 2# is 5:1.

[0009] Preferably, the sludge concentration in the UASB reactor is controlled at 8000-10000 mg / L, and the hydraulic retention time is 2 days.

[0010] Preferably, the sludge concentration in the ABR reactor is controlled at 3000-5000 mg / L, and the hydraulic retention time is 12 h.

[0011] Preferably, the reagent comprises the following components in parts by weight: 60-70 parts sodium acetate, 30-35 parts waste sugar residue, and 0.8-1.2 parts inorganic phosphorus.

[0012] Preferably, the ratio of sodium acetate: waste sugar residue: inorganic phosphorus is 65:34:1.

[0013] Preferably, the COD equivalent of the sodium acetate is 0.78 kg COD / kg, the COD equivalent of the waste sugar residue is 1.2 kg COD / kg, and the average COD equivalent of the reagent is 0.915 kg COD / kg.

[0014] Preferably, the biological aeration reactor includes a third reactor body and a perforated aeration pipe. The perforated aeration pipe is located at the bottom of the third reactor body. The perforation diameter of the perforated aeration pipe is 8 mm, the hole spacing is 50-100 mm, and two rows of holes are arranged downward at a 45° angle on both sides of the pipe wall.

[0015] Preferably, the sedimentation and filtration device includes a fourth reactor body, a first partition, a second partition, and a third partition. The first partition, the second partition, and the third partition cooperate to divide the fourth reactor body into a sedimentation chamber and a filtration chamber. The bottom of the sedimentation chamber is provided with a wave-shaped barrier structure, and the filtration chamber is provided with a quartz sand filtration device.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The efficient integrated biological reduction treatment equipment for perchlorate wastewater of the present invention adopts a two-stage biological reduction design, including biological reduction reactor 1# and biological reduction reactor 2#, which effectively buffers the impact of changes in influent water quality, quantity and temperature, and improves the overall tolerance and operational stability of the system. Combined with biological aeration reactor and sedimentation filtration device, it ensures that the effluent not only meets the perchlorate standard, but also meets the discharge requirements for other pollutants (such as nitrate, SS, etc.).

[0017] 2. The high-efficiency integrated equipment of the present invention is based on a precise concentration control strategy, which optimizes carbon source consumption and reduces operating costs while ensuring treatment effect.

[0018] 3. The high-efficiency integrated equipment of the present invention is designed with a path to return the remaining sludge from the sedimentation tank to the bioreduction reactors 1# and 2# to replenish the microbial strains, thereby enhancing the biological stability and shock resistance of the system. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the process flow module of the high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater in an embodiment of the present invention; Figure 2 This is a schematic diagram of the planar structure of the high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater in an embodiment of the present invention; Figure 3 This is a schematic cross-sectional view of the bioreduction reactor 1# in the high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater in this embodiment of the invention. Figure 4 This is a schematic cross-sectional view of the bioreduction reactor 2# in the high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater in this embodiment of the invention. Figure 5 This is a schematic cross-sectional view of the biological aeration reactor in the high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater in this embodiment of the invention. Figure 6 This is a cross-sectional schematic diagram of the sedimentation + filtration device in the high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater in an embodiment of the present invention.

[0020] In the diagram: 10, Bioreduction reactor 1#; 20, Bioreduction reactor 2#; 30, Biological aeration reactor; 40, Sedimentation and filtration device; 50, Complete dosing device. Detailed Implementation

[0021] This invention aims to solve the technical problem of perchlorate wastewater treatment failing to meet standards under conditions of changing wastewater quality or sudden drops in ambient temperature, and provides a highly efficient integrated device for biological reduction treatment of perchlorate wastewater, such as... Figures 1-6As shown, the equipment includes a bioreduction reactor group, a biological aeration reactor 30, and a sedimentation and filtration device 40 connected in sequence. The bioreduction reactor group is equipped with at least one set of bioreduction reactors 1#10 and 2#20 connected in series, and a complete set of dosing devices 50 connected to bioreduction reactors 1# and 2# respectively. Bioreduction reactor 1#10 is a UASB reactor, and bioreduction reactor 2#20 is an ABR reactor. When the perchlorate concentration in the wastewater is ≤1000mg / L, the complete set of dosing devices 50 is used to add reagents to bioreduction reactor 1# unidirectionally. The required dosage of the reagent is: COD equivalent:perchlorate mass ratio of (2-5):1. When the perchlorate concentration in the wastewater is >1000mg / L, the complete set of dosing devices 50 is used to add reagents to bioreduction reactors 1#10 and 2#20 simultaneously. In bioreduction reactor 1#10, the required dosage of the reagent is: COD equivalent:perchlorate mass ratio of (2-5):1. The mass ratio of COD equivalent to perchlorate is (4-5):1. In bioreduction reactor 2#, the required dosage of reagent is: the mass ratio of COD equivalent to perchlorate is (1-3):1. Optimally, the reagent dosage of bioreduction reactor 1#10: the reagent dosage of bioreduction reactor 2#20 = 5:1.

[0022] In this invention, COD equivalent refers to the number of milligrams of oxygen consumed per unit mass or unit volume of carbon source during complete oxidation, and is used to measure the effectiveness of carbon source in wastewater treatment and to calculate the dosage.

[0023] The UASB reactor is an upflow anaerobic sludge blanket reactor designed as a front-end buffer and adsorption unit. By maintaining a high sludge concentration, its main function is to rapidly remove some pollutants through physicochemical adsorption, and to buffer and adapt to changes in the quality, quantity and temperature of the influent, thus protecting the subsequent treatment units.

[0024] The ABR reactor is an anaerobic baffle plate reactor designed as the core stable reduction unit. It receives the effluent after buffering and pretreatment by reactor #1, resulting in more stable water quality and temperature and reduced shock load. Under these conditions, the biochemical reduction function of microorganisms such as perchlorate-reducing bacteria enriched in the ABR reactor can be fully utilized, ensuring that perchlorate (ClO4⁻) is stably and efficiently reduced to harmless chloride ions (Cl⁻).

[0025] In the above structure, the hierarchical design of "front-end shock resistance + back-end stable treatment" has carried out functional division and collaborative design, forming a treatment process similar to "A / B segment", realizing complementary advantages, and based on the precise control strategy of concentration, while ensuring the treatment effect, it optimizes carbon source consumption, reduces operating costs, and solves the industry problem of unstable effect caused by water quality and temperature changes when treating perchlorate wastewater by traditional single biological methods.

[0026] In this embodiment, as Figure 3 As shown, the UASB reactor includes a first reactor body, an inlet pipe, and a perforated water distribution pipe. The perforated water distribution pipe is located at the bottom of the first reactor body, with an opening ratio of 5% to ensure smooth water flow while preventing soil particles from entering the pipe. This UASB reactor uses an upflow method to allow wastewater to pass through a granular sludge bed formed by high-concentration anaerobic sludge. During operation, anaerobic microorganisms aggregate into high-density granular sludge with excellent settling properties, greatly increasing the sludge retention time (SRT) and enabling the reactor to operate stably under high loads. The sludge concentration in the UASB reactor is controlled at 8000-10000 mg / L, and the hydraulic retention time is 2 days.

[0027] like Figure 4 As shown, the ABR reactor includes a second reactor body and several upper and lower baffles located within the second reactor body. The upper and lower baffles divide the second reactor body into multiple reaction chambers connected in series, causing the wastewater to flow through these chambers in a "baffled" manner, forming an approximate plug flow pattern. This prolongs the hydraulic retention time and improves treatment efficiency. Due to variations in organic load and redox potential gradients in each chamber, acidifying bacteria and methanogenic bacteria are enriched in different chambers, achieving longitudinal separation of the acidification and methanogenesis processes and avoiding the inhibition of methanogenic bacteria by high concentrations of organic acids. The sludge concentration in the ABR reactor is controlled at 3000-5000 mg / L, and the hydraulic retention time is 12 h.

[0028] The complete dosing system includes a dosing pump, which is used to add reagents to the bioreduction reactor group according to the control logic of the control system, providing carbon and electron donors for the bioreduction reactor group. The bioreduction reactor group can be one or more groups, adjusted as needed, which will not be elaborated here. The reagents include the following components by weight: 60-70 parts sodium acetate, 30-35 parts waste sugar residue, and 0.8-1.2 parts inorganic phosphorus. The preparation steps are as follows: crush the recovered waste sugar residue into powder, mix it with sodium acetate and inorganic phosphorus, mix evenly, then seal it in a sealed plastic bag, and finally protect it with a woven bag. Dosage: First, pour 80% clean water into the reagent tank, then simultaneously and evenly add the reagent while stirring. The dosage of reagent per ton of reagent solution is 50-100 kg. In this embodiment, the COD equivalent of sodium acetate is 0.78 kg COD / kg, the COD equivalent of waste sugar residue is 1.2 kg COD / kg, and the average COD equivalent of the reagent is 0.915 kg COD / kg. Preferably, the ratio of sodium acetate:waste sugar residue:inorganic phosphorus is 65:34:1. Both sodium acetate and waste sugar residue in the above reagent are highly available carbon sources that can be rapidly absorbed by microorganisms, compensating for the carbon source deficiency in low-carbon wastewater. Especially under special circumstances, adding this reagent can significantly improve the denitrification rate, ensuring that the total nitrogen in the effluent meets the standards. The added inorganic phosphorus provides the necessary phosphorus source for microorganisms, avoiding the inhibition of biological activity caused by C / P imbalance.

[0029] like Figure 5 As shown, the biological aeration reactor includes a third reactor body and perforated aeration pipes. The perforated aeration pipes are located at the bottom of the third reactor body. The perforation diameter of the perforated aeration pipes is 8 mm, and the hole spacing is 50-100 mm. Two rows of holes are arranged downward at a 45° angle on both sides of the pipe wall to ensure uniform aeration and prevent clogging.

[0030] like Figure 6As shown, the sedimentation and filtration device includes a fourth reactor body, a first partition, a second partition, and a third partition. The first partition is the upper partition (connected to the top of the fourth reactor body) and is located at the inlet of the fourth reactor body. The second partition is the lower partition (connected to the bottom of the fourth reactor body), and the third partition is the upper partition. A flow gap is provided between the second and third partitions to buffer the water flow rate. The first, second, and third partitions work together to divide the fourth reactor body into a sedimentation chamber and a filtration chamber. The bottom of the sedimentation chamber has a corrugated baffle structure, and the filtration chamber is equipped with a quartz sand filter for filtering quartz sand. The biological aeration reactor is used to remove residual carbon sources in the effluent of the biological reduction reactor group using the activated sludge process, preventing the effluent COD from exceeding the standard. Its working principle is to supply oxygen to the reactor to promote the growth and metabolism of aerobic microorganisms, thereby degrading organic pollutants in the wastewater and achieving nitrogen and phosphorus removal. In one embodiment, the sedimentation and filtration device is further equipped with a return water pipe and a sludge extraction pump connected to the return water pipe. The return water pipe is connected to bioreduction reactors 1# and 2# respectively. The sludge extraction pump is used to extract sludge from the sedimentation chamber and replenish it to bioreduction reactors 1# and 2#. This biological aeration reactor separates the influent into mud and water, and then filters the supernatant after mud-water separation with quartz sand to ensure that the effluent meets discharge standards. At the same time, the remaining sludge is pumped to bioreduction reactors 1# and 2# to replenish the biological inoculum. The specific replenishment amount is controlled according to specific analysis and will not be elaborated here.

[0031] The working principle of the above-mentioned device is as follows: Water flow and treatment path: Wastewater flows sequentially through → Bioreduction reactor 1# → Bioreduction reactor 2# → Biological aeration reactor → Sedimentation + filtration device → Discharge meeting standards. By adjusting the differentiated dosing strategy of the reagents to the two reactors (dosing only in reactor 1# or simultaneously in reactors 1# and 2# in proportion), the system can adapt to different concentrations of wastewater (especially high concentrations >1000mg / L), ensuring the overall treatment capacity of the system. Sludge is returned from the final sedimentation + filtration device to the front-end bioreduction reactors 1# and / or 2#, forming an internal microbial supplement. This allows the equipment to maintain stable and efficient treatment capacity under conditions such as fluctuating wastewater concentrations and sudden drops in external temperature, ensuring that the effluent consistently meets discharge standards.

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In the description of this invention, it should be understood that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be intermediate elements present. Conversely, when an element is said to be "directly" connected to another element, there are no intermediate elements. In the following embodiments, unless otherwise specified, the preparation steps of the agent are as follows: the recycled waste sugar residue is crushed into powder, mixed with sodium acetate and inorganic phosphorus, mixed evenly, then sealed in a sealed plastic bag, and finally protected with a woven bag. Use of the agent: first, 80% clean water (by volume) is poured into the reagent tank, then the agent is added evenly while stirring. The dosage of the agent is 50 kg per ton of reagent solution. The sedimentation and filtration device is equipped with a return water pipe and a sludge extraction pump connected to the return water pipe. The inorganic phosphorus is potassium dihydrogen phosphate. The waste sugar residue comes from the waste residue of a candy factory.

[0035] Example 1 A highly efficient integrated equipment for biological reduction treatment of perchlorate wastewater includes a biological reduction reactor group, a biological aeration reactor, and a sedimentation and filtration device connected in sequence. The biological reduction reactor group is equipped with a set of biological reduction reactors 1# and 2# connected in series, and a complete set of dosing devices connected to biological reduction reactors 1# and 2# respectively. Biological reduction reactor 1# is a UASB reactor, and biological reduction reactor 2# is an ABR reactor.

[0036] The reagent comprises the following components by weight: 65 parts sodium acetate, 34 parts waste sugar residue, and 1 part inorganic phosphorus. The perforation rate of the perforated water distribution pipe is 5%. The perforation diameter of the perforated aeration pipe is 8 mm, the hole spacing is 100 mm, and the two rows of holes are arranged downwards at a 45° angle on both sides of the pipe wall.

[0037] Example 2 A highly efficient integrated equipment for biological reduction treatment of perchlorate wastewater includes a biological reduction reactor group, a biological aeration reactor, and a sedimentation and filtration device connected in sequence. The biological reduction reactor group is equipped with a set of biological reduction reactors 1# and 2# connected in series, and a complete set of dosing devices connected to biological reduction reactors 1# and 2# respectively. Biological reduction reactor 1# is a UASB reactor, and biological reduction reactor 2# is an ABR reactor.

[0038] The reagent comprises the following components by weight: 65 parts sodium acetate, 34 parts waste sugar residue, and 0.1 parts inorganic phosphorus. The perforation rate of the perforated water distribution pipe is 5%. The perforated aeration pipe has an aperture of 8 mm and a hole spacing of 100 mm, with two rows of holes arranged downwards at a 45° angle on both sides of the pipe wall.

[0039] Example 3 A highly efficient integrated equipment for biological reduction treatment of perchlorate wastewater includes a biological reduction reactor group, a biological aeration reactor, and a sedimentation and filtration device connected in sequence. The biological reduction reactor group is equipped with a set of biological reduction reactors 1# and 2# connected in series, and a complete set of dosing devices connected to biological reduction reactors 1# and 2# respectively. Biological reduction reactor 1# is a UASB reactor, and biological reduction reactor 2# is an ABR reactor.

[0040] The reagent comprises the following components by weight: 65 parts sodium acetate and 34 parts waste sugar residue. The perforation rate of the perforated water distribution pipe is 5%. The perforation diameter of the perforated aeration pipe is 8 mm, the hole spacing is 100 mm, and the two rows of holes are arranged downwards at a 45° angle on both sides of the pipe wall.

[0041] Example 4 A highly efficient integrated equipment for biological reduction treatment of perchlorate wastewater includes a biological reduction reactor group, a biological aeration reactor, and a sedimentation and filtration device connected in sequence. The biological reduction reactor group is equipped with a set of biological reduction reactors 1# and 2# connected in series, and a complete set of dosing devices connected to biological reduction reactors 1# and 2# respectively. Biological reduction reactor 1# is a UASB reactor, and biological reduction reactor 2# is an ABR reactor.

[0042] The reagent comprises the following components by weight: 65 parts sodium acetate, 34 parts waste sugar residue, and 1 part inorganic phosphorus. The perforated water distribution pipe has an opening rate of 12%. The perforated aeration pipe has an opening diameter of 8 mm and a hole spacing of 100 mm, with two rows of holes arranged downwards at a 45° angle on both sides of the pipe wall.

[0043] Example 5 A highly efficient integrated equipment for biological reduction treatment of perchlorate wastewater includes a biological reduction reactor group, a biological aeration reactor, and a sedimentation and filtration device connected in sequence. The biological reduction reactor group is equipped with a set of biological reduction reactors 1# and 2# connected in series, and a complete set of dosing devices connected to biological reduction reactors 1# and 2# respectively. Biological reduction reactor 1# is a UASB reactor, and biological reduction reactor 2# is an ABR reactor.

[0044] The reagent comprises the following components by weight: 65 parts sodium acetate, 34 parts waste sugar residue, and 1 part inorganic phosphorus. The perforation rate of the perforated water distribution pipe is 2%. The perforation diameter of the perforated aeration pipe is 10 mm, the hole spacing is 100 mm, and the two rows of holes are arranged downwards at a 45° angle on both sides of the pipe wall.

[0045] Example 6 A highly efficient integrated equipment for biological reduction treatment of perchlorate wastewater includes a biological reduction reactor group, a biological aeration reactor, and a sedimentation and filtration device connected in sequence. The biological reduction reactor group is equipped with a set of biological reduction reactors 1# and 2# connected in series, and a complete set of dosing devices connected to biological reduction reactors 1# and 2# respectively. Biological reduction reactor 1# is a UASB reactor, and biological reduction reactor 2# is an ABR reactor.

[0046] The reagent comprises the following components by weight: 65 parts sodium acetate, 34 parts waste sugar residue, and 1 part inorganic phosphorus. The perforated water distribution pipe has an opening rate of 2%. The perforated aeration pipe has an opening diameter of 5 mm and a hole spacing of 100 mm, with two rows of holes arranged downwards at a 45° angle on both sides of the pipe wall. The sedimentation and filtration device does not have a return water pipe or a sludge removal pump connected to the return water pipe.

[0047] Comparative Example 1 A highly efficient integrated equipment for biological reduction treatment of perchlorate wastewater includes a biological reduction reactor group, a biological aeration reactor, and a sedimentation and filtration device connected in sequence. The biological reduction reactor group is equipped with a set of biological reduction reactor 1# connected in series and a complete set of dosing devices connected to biological reduction reactor 1#. Biological reduction reactor 1# is a UASB reactor.

[0048] The reagent comprises the following components by weight: 65 parts sodium acetate, 34 parts waste sugar residue, and 1 part inorganic phosphorus. The perforation rate of the perforated water distribution pipe is 5%. The perforation diameter of the perforated aeration pipe is 8 mm, the hole spacing is 100 mm, and the two rows of holes are arranged downwards at a 45° angle on both sides of the pipe wall.

[0049] Comparative Example 2 A highly efficient integrated equipment for biological reduction treatment of perchlorate wastewater includes a biological reduction reactor group, a biological aeration reactor, and a sedimentation and filtration device connected in sequence. The biological reduction reactor group is equipped with a set of biological reduction reactors 2# connected in series and a complete set of dosing devices connected to biological reduction reactors 2#. Biological reduction reactors 2# are ABR reactors.

[0050] The reagent comprises the following components by weight: 65 parts sodium acetate, 34 parts waste sugar residue, and 1 part inorganic phosphorus. The perforation rate of the perforated water distribution pipe is 5%. The perforation diameter of the perforated aeration pipe is 8 mm, the hole spacing is 100 mm, and the two rows of holes are arranged downwards at a 45° angle on both sides of the pipe wall.

[0051] Comparative Example 3 A highly efficient integrated equipment for biological reduction treatment of perchlorate wastewater includes a biological reduction reactor group and a sedimentation and filtration device connected in sequence. The biological reduction reactor group is equipped with a set of biological reduction reactors 1# and 2# connected in series, and a complete set of dosing devices connected to biological reduction reactors 1# and 2# respectively. Biological reduction reactor 1# is a UASB reactor and biological reduction reactor 2# is an ABR reactor.

[0052] The reagent comprises the following components by weight: 65 parts sodium acetate, 34 parts waste sugar residue, and 1 part inorganic phosphorus. The perforation rate of the perforated water distribution pipe is 5%. The perforation diameter of the perforated aeration pipe is 8 mm, the hole spacing is 100 mm, and the two rows of holes are arranged downwards at a 45° angle on both sides of the pipe wall.

[0053] Performance testing 1. Sample 1: Wastewater from a fireworks factory workshop, with a perchlorate concentration of 800 mg / L. In the bioreduction reactor 1#, the COD equivalent to perchlorate mass ratio was 5:1, while the reagent dosage in bioreduction reactor 2# was 0. The sludge concentration in bioreduction reactor 1# was controlled at 8000-10000 mg / L with a hydraulic retention time of 2 days, and the sludge concentration in bioreduction reactor 2# was controlled at 3000-5000 mg / L with a hydraulic retention time of 12 hours.

[0054] 2. Sample 2: Wastewater from a fireworks factory workshop, with a perchlorate concentration of 800 mg / L. In the bioreduction reactor 1#, the COD equivalent to perchlorate mass ratio was 5:1, while the reagent dosage in bioreduction reactor 2# was 0. The sludge concentration in bioreduction reactor 1# was controlled at 8000-10000 mg / L with a hydraulic retention time of 1 day, and the sludge concentration in bioreduction reactor 2# was controlled at 3000-5000 mg / L with a hydraulic retention time of 12 h.

[0055] 3. Sample 3: Wastewater from a fireworks factory workshop, with a perchlorate concentration of 1500 mg / L. In bioreduction reactor #1, the COD equivalent to perchlorate mass ratio was 5:1, while in bioreduction reactor #2, the COD equivalent to perchlorate mass ratio was 1:1. The sludge concentration in bioreduction reactor #1 was controlled at 8000-10000 mg / L with a hydraulic retention time of 2 days, and the sludge concentration in bioreduction reactor #2 was controlled at 3000-5000 mg / L with a hydraulic retention time of 12 hours.

[0056] 4. Sample 4: Wastewater from a fireworks factory workshop, with a perchlorate concentration of 1500 mg / L. In bioreduction reactor #1, the COD equivalent to perchlorate mass ratio was 5:1, while in bioreduction reactor #2, the COD equivalent to perchlorate mass ratio was 1:1. The sludge concentration in bioreduction reactor #1 was controlled at 8000-10000 mg / L with a hydraulic retention time of 2 days, and the sludge concentration in bioreduction reactor #2 was controlled at 3000-5000 mg / L with a hydraulic retention time of 6 hours.

[0057] 3. The test results are shown in Tables 1-4.

[0058] Table 1 - Test Results of Sample 1: Table 2 - Test Results of Sample 2: Table 3 - Test Results of Sample 3: Table 4 - Test Results of Sample 4: The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A highly efficient integrated device for biological reduction treatment of perchlorate wastewater, characterized in that, It includes a bioreduction reactor group, a biological aeration reactor and a sedimentation and filtration device connected in sequence. The bioreduction reactor group is equipped with at least one set of bioreduction reactor 1# and bioreduction reactor 2# connected in series and a complete set of dosing devices connected to bioreduction reactor 1# and bioreduction reactor 2# respectively. Bioreduction reactor 1# is a UASB reactor and bioreduction reactor 2# is an ABR reactor.

2. The high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater according to claim 1, characterized in that, When the perchlorate concentration in the wastewater is ≤1000mg / L, the complete dosing device is used to add reagents to the unidirectional bioreduction reactor 1#. The required dosage of the reagent is: COD equivalent: perchlorate mass ratio of (2-5):

1. When the perchlorate concentration in the wastewater is >1000mg / L, the complete dosing device is used to add reagents to both bioreduction reactor 1# and bioreduction reactor 2# simultaneously. In bioreduction reactor 1#, the required dosage of the reagent is: COD equivalent: perchlorate mass ratio of (4-5):

1. In bioreduction reactor 2#, the required dosage of the reagent is: COD equivalent: perchlorate mass ratio of (1-3):

1.

3. The high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater according to claim 2, characterized in that, The ratio of reagent dosage in bioreduction reactor 1# to that in bioreduction reactor 2# is 5:

1.

4. The high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater according to claim 1, characterized in that, The sludge concentration in the UASB reactor is controlled at 8000-10000 mg / L, and the hydraulic retention time is 2 days.

5. The high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater according to claim 1, characterized in that, The sludge concentration in the ABR reactor is controlled at 3000-5000 mg / L, and the hydraulic retention time is 12 h.

6. The high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater according to claim 1, characterized in that, The reagent comprises the following components in parts by weight: 60-70 parts sodium acetate, 30-35 parts waste sugar residue, and 0.8-1.2 parts inorganic phosphorus.

7. The high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater according to claim 6, characterized in that, The ratio of sodium acetate: waste sugar residue: inorganic phosphorus is 65:34:

1.

8. The high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater according to claim 6, characterized in that, The COD equivalent of the sodium acetate is 0.78 kg COD / kg, the COD equivalent of the waste sugar residue is 1.2 kg COD / kg, and the average COD equivalent of the reagent is 0.915 kg COD / kg.

9. The high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater according to claim 1, characterized in that, The biological aeration reactor includes a third reactor body and perforated aeration pipes. The perforated aeration pipes are located at the bottom of the third reactor body. The perforation diameter of the perforated aeration pipes is 8 mm, the hole spacing is 50-100 mm, and two rows of holes are arranged downward at a 45° angle on both sides of the pipe wall.

10. The high-efficiency integrated equipment for biological reduction treatment of perchlorate wastewater according to claim 1, characterized in that, The sedimentation and filtration device includes a fourth reactor body, a first partition, a second partition, and a third partition. The first partition, the second partition, and the third partition work together to divide the fourth reactor body into a sedimentation chamber and a filtration chamber. The bottom of the sedimentation chamber is provided with a wave-shaped barrier structure, and the filtration chamber is provided with a quartz sand filtration device.

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