CN218893523U

CN218893523U - Denitrification device suitable for treating wastewater containing high-concentration nitrate

Info

Publication number: CN218893523U
Application number: CN202223323012.7U
Authority: CN
Inventors: 高峰; 谈娟娟; 徐卫东; 纪东升; 王伟
Original assignee: Jiangsu Lason Chemical Environmental Protection Co ltd
Current assignee: Jiangsu Lason Chemical Environmental Protection Co ltd
Priority date: 2022-12-12
Filing date: 2022-12-12
Publication date: 2023-04-21
Anticipated expiration: 2032-12-12

Abstract

The utility model discloses a denitrification device suitable for treating wastewater containing high-concentration nitrate, which comprises four denitrification reaction tanks and two medicament tanks, wherein the four denitrification reaction tanks are of rectangular structures and have the same external dimensions, the long sides and the short sides of every two adjacent denitrification reaction tanks are arranged in close proximity, and are spliced into an L-shaped structure, so that the four denitrification reaction tanks form a square structure in the plane direction; the two reagent tanks are positioned in a central area surrounded by the four denitrification reaction tanks, and the two reagent tanks are arranged in a staggered manner; the device is additionally provided with a flat membrane filtering device for the denitrification reaction effluent, can intercept and treat the sludge, microorganisms, metabolites and other impurities in the effluent, can reduce the sludge loss on one hand, maintain the sludge concentration on the other hand, and can ensure the clean recycling requirement of the denitrification reaction effluent.

Description

Denitrification device suitable for treating wastewater containing high-concentration nitrate

Technical Field

The utility model belongs to the technical field of industrial wastewater biological treatment, and particularly relates to a denitrification device for treating industrial wastewater containing high-concentration nitrate.

Background

The wastewater containing high-concentration nitrate is widely distributed in wastewater of industries such as chlor-alkali, electroplating, coking, leather, chemical fertilizer and the like, and the wastewater is one of main sources of nitrogen element pollution of water environment. In order to solve and prevent the problem of nitrogen pollution, the industrial wastewater containing high-concentration nitrate is required to be subjected to denitrification treatment, and the emission of nitrogen pollution sources to natural water is controlled from the source.

Biological denitrification technology is the most effective method for wastewater denitrification treatment. The biological denitrification process is denitrifying bacteria catabolized nitrate (NO ₃ ^- ) In (2), the denitrifying bacteria convert nitrate (NO ₃ ^- ) Nitrogen (N) in (a) is converted into a nitrogen (N) by a series of intermediates (nitrite NO ₂ ^- Nitric oxide NO, nitrous oxide N ₂ O) reduction to Nitrogen (N) ₂ ) Is a biochemical process of (a). The denitrification process is carried out in two steps, the first step is formed by NO ₃ ^- Conversion to NO ₂ ^- The second step is to make NO ₂ ^- Converted into NO, N ₂ O、N ₂ . Meanwhile, denitrifying bacteria are used for synthesizing cells by converting carbon-containing organic matters and partial nitrate into ammonia nitrogen, wherein the carbon-containing organic matters (carbon sources) can be organic carbon in wastewater or carbon sources in cells, and can also be externally added.

Methanol, glucose, sodium acetate are commonly used additional carbon sources. When methanol is used as a carbon source, the methanol belongs to a hazardous chemical substance on the one hand, and when the nitrate concentration is high, the methanol has high dosage and has certain biotoxicity to microorganisms, and the methanol is currently used as the carbon source. When glucose is used as a carbon source, the reaction speed is low, and low-molecular organic acids such as acetic acid, formic acid, propionic acid and the like are required to be converted into the organic acids to be absorbed and utilized by microorganisms, and the organic acids are not suitable for long-term use, and are easy to cause sludge expansion and sludge increase after long-term use. Thus, sodium acetate is currently the most commonly used additional carbon source in engineering applications, but has the disadvantage that when it is used for cell synthesis, it results in an increase in the pH of the water, and when the pH is increased to 9, denitrification is inhibited.

Disclosure of Invention

The utility model aims to solve the problem of the rise of the pH of a water body when sodium acetate is used as a denitrification carbon source, and provides a denitrification device suitable for high-concentration nitrate wastewater.

The utility model is realized in the following way:

the device comprises four denitrification reaction tanks and two reagent tanks, wherein the four denitrification reaction tanks are a first denitrification reaction tank, a second denitrification reaction tank, a third denitrification reaction tank and a fourth denitrification reaction tank, and the two reagent tanks are a first reagent tank and a second reagent tank; the planar structures of the four denitrification reaction tanks in the device are rectangular, and the external dimensions are consistent; the long side and the short side of every two adjacent denitrification reaction tanks are arranged in close proximity, and are spliced into an L-shaped structure, so that the four denitrification reaction tanks form a square structure in the plane direction; the central area of a square structure surrounded by the four denitrification reaction tanks is provided with a first medicament tank and a second medicament tank, and the two medicament tanks are arranged in a staggered manner.

Further, an online pH monitoring system is arranged above the four denitrification reaction tanks.

Further, a water inlet is arranged on the wall of the long side of the periphery of the first denitrification reaction tank and is connected with a water inlet pump through a pipeline.

Further, a water flow channel is arranged on a shared tank wall of the first denitrification reaction tank and the second denitrification reaction tank, a water flow channel is arranged on a shared tank wall of the second denitrification reaction tank and the third denitrification reaction tank, and a water flow channel is arranged on a shared tank wall of the third denitrification reaction tank and the fourth denitrification reaction tank.

Further, a water outlet is arranged on the peripheral short side tank wall of the fourth denitrification reaction tank, and a flat membrane is arranged at a position 10-50 cm away from the water outlet.

Further, the structures of the first medicament tank and the second medicament tank can be square or round.

Further, a set of automatic dosing device is arranged above the first medicament tank and the second medicament tank respectively, each set of automatic dosing device is connected with four dosing pipelines, and the four dosing pipelines extend to the four denitrification reaction tanks respectively.

Further, the first medicament pool is prepared into a dilute acid solution with a certain concentration, and the dilute acid solution can be dilute hydrochloric acid or dilute sulfuric acid.

Further, the carbon source solution with a certain concentration is prepared in the second medicament pool, and the carbon source can be acetic acid, sodium acetate and the like.

The beneficial effects of the utility model compared with the prior art are as follows:

1. the utility model designs four denitrification reaction tanks which are communicated, and aims to carry out graded biological denitrification on high-concentration nitrate wastewater, and meanwhile, each denitrification reaction tank can carry out medicament supplement according to the nitrate concentration, COD value and pH value in water body, so as to adjust the C/N ratio and the pH value and meet the denitrification reaction condition.

2. The device is additionally provided with a flat membrane filtering device for the denitrification reaction effluent, can intercept and treat the sludge, microorganisms, metabolites and other impurities in the effluent, can reduce the sludge loss on one hand, maintain the sludge concentration on the other hand, and can ensure the clean recycling requirement of the denitrification reaction effluent.

3. The device has compact structural design and reduces the occupied area.

Drawings

FIG. 1 is a schematic diagram of a denitrification device suitable for treating wastewater containing high concentration nitrate in accordance with the present utility model;

wherein, 1-first denitrification reaction tank, 2-second denitrification reaction tank, 3-third denitrification reaction tank, 4-fourth denitrification reaction tank, 5-first medicament tank, 6-second medicament tank, 7-water inlet pump, 8-pipeline, 9-water inlet, 10-water flow channel, 11-water flow channel, 12-water flow channel, 13-water outlet, 14-flat membrane, 15-automatic dosing device and 16-dosing pipeline.

Detailed Description

The present utility model will be described in further detail with reference to the following examples, in order to make the objects, technical solutions and effects of the present utility model more apparent and clear. It should be noted that the detailed description herein is for purposes of illustration only and is not intended to limit the utility model.

As shown in fig. 1, the device comprises four denitrification reaction tanks and two reagent tanks, namely a first denitrification reaction tank 1, a second denitrification reaction tank 2, a third denitrification reaction tank 3, a fourth denitrification reaction tank 4, a first reagent tank 5 and a second reagent tank 6.

The four denitrification reaction tanks are of rectangular structures and identical in external dimensions, and the long sides are twice as long as the short sides; the long side and the short side of every two adjacent denitrification reaction tanks are arranged in close proximity, and are spliced into an L-shaped structure, so that the four denitrification reaction tanks enclose a square structure in the plane direction. An online pH monitoring system is arranged above the four denitrification reaction tanks. A water inlet 9 is arranged on the wall of the long side of the periphery of the first denitrification reaction tank 1 and is connected with a water inlet pump 7 through a pipeline 8; a water flow channel 10 is arranged on a shared tank wall of the first denitrification reaction tank 1 and the second denitrification reaction tank 2; a water flow channel 11 is arranged on a shared tank wall of the second denitrification reaction tank 2 and the third denitrification reaction tank 3; a water flow channel 12 is arranged on a shared tank wall of the third denitrification reaction tank 3 and the fourth denitrification reaction tank 4; a water outlet 13 is arranged on the peripheral short side pool wall of the fourth denitrification reaction pool 4, and a flat membrane 14 is arranged at a position 30cm away from the water outlet.

The two reagent tanks are located in a central area surrounded by the four denitrification reaction tanks, are of square structures and are arranged in a staggered mode, and the side length of the two reagent tanks is slightly smaller than 1/4 of the long side of the denitrification reaction tank. An automatic dosing device 15 is arranged above the first medicament tank 5 and the second medicament tank 6, each automatic dosing device is connected with four dosing pipelines 16, and the four dosing pipelines 16 extend to four denitrification reaction tanks respectively. The first medicament pool 5 is prepared into a dilute hydrochloric acid solution with a certain concentration; a sodium acetate solution with a certain concentration is prepared in the second medicament pool 6.

The foregoing is merely a preferred embodiment of the utility model, and it should be noted that modifications could be made by those skilled in the art without departing from the principles of the utility model, which modifications would also be considered to be within the scope of the utility model.

Claims

1. The denitrification device is suitable for treating wastewater containing high-concentration nitrate and is characterized by comprising four denitrification reaction tanks and two reagent tanks, wherein the four denitrification reaction tanks are respectively a first denitrification reaction tank (1), a second denitrification reaction tank (2), a third denitrification reaction tank (3) and a fourth denitrification reaction tank (4), and the two reagent tanks are a first reagent tank (5) and a second reagent tank (6);

the four denitrification reaction tanks are of rectangular structures and have the same external dimensions; the long side and the short side of every two adjacent denitrification reaction tanks are arranged in close proximity, and are spliced into an L-shaped structure, so that the four denitrification reaction tanks form a square structure in the plane direction; the two reagent tanks are positioned in a central area surrounded by the four denitrification reaction tanks, and the two reagent tanks are arranged in a staggered manner; the automatic dosing device (15) is arranged above the first medicament tank and the second medicament tank, each automatic dosing device is connected with four dosing pipelines (16), and the four dosing pipelines (16) extend to the four denitrification reaction tanks respectively.

2. The denitrification device for treating wastewater containing high concentration of nitrate according to claim 1, wherein an on-line pH monitoring system is arranged above each of the four denitrification reaction tanks.

3. The denitrification device for treating wastewater containing high concentration nitrate according to claim 1, wherein a water inlet (9) is arranged on the peripheral long-side tank wall of the first denitrification reaction tank (1) and is connected with a water inlet pump (7) through a pipeline (8); a first water flow channel (10) is arranged on a shared pool wall of the first denitrification reaction pool (1) and the second denitrification reaction pool (2); a second water flow channel (11) is arranged on a shared pool wall of the second denitrification reaction pool (2) and the third denitrification reaction pool (3); a third water flow channel (12) is arranged on a shared pool wall of the third denitrification reaction pool (3) and the fourth denitrification reaction pool (4); a water outlet (13) is arranged on the peripheral short side pool wall of the fourth denitrification reaction pool (4), and a flat membrane (14) is arranged at a position 10-50 cm away from the water outlet.

4. The denitrification device for treating wastewater containing high concentration of nitrate according to claim 1, wherein the first chemical tank and the second chemical tank are square or round.

5. The denitrification device for treating wastewater containing high concentration of nitrate according to claim 4, wherein when the two reagent tanks are square, the square is arranged in a staggered way, and the side length of the two reagent tanks is smaller than 1/4 of the long side of the denitrification reaction tank.

6. The denitrification device for treating wastewater containing high concentration of nitrate according to claim 1, wherein the four denitrification reaction tanks are rectangular in structure, and the long side is twice as long as the short side.