CN212655652U

CN212655652U - Reaction device for removing sulfate in wastewater

Info

Publication number: CN212655652U
Application number: CN202021013127.4U
Authority: CN
Inventors: 苏小耀; 任明信; 蔡剑
Original assignee: Hynar Water Group Corp
Current assignee: Hynar Water Group Corp
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2021-03-05
Anticipated expiration: 2030-06-04

Abstract

The utility model discloses a get rid of reaction unit of sulphate in waste water, including reactor, agitator, water inlet, delivery port and closing plate, reactor formula tempering structure as an organic whole, the agitator is installed in the reactor, water inlet and delivery port are installed respectively in the both sides wall of reactor, the closing plate is installed in the reactor top. The reaction device of the utility model utilizes the special biochemical combination process to remove the sulfate in the wastewater, reduces the impact on the follow-up biochemical system and meets the pollution discharge standard with limited requirements on the sulfate of the effluent.

Description

Reaction device for removing sulfate in wastewater

Technical Field

The utility model relates to a sewage treatment technical field, concretely relates to get rid of reaction unit of sulphate in waste water.

Background

Over the last 20 years, with the accelerated development of national economy, the pollution of many industrial waste water, especially sulfate waste water, has become serious, such as waste water from food (molasses, sea food, edible oil, etc.) processing, pharmaceutical, paper and pulp making, etc., which contain high concentrations of sulfate and organic matter. Many major cities groundwater in our country have received sulfate pollution of different degrees, contain sour hydrochloric acid nature waste water and directly discharge into the water without handling, will make and accomodate the water acidizing, the product hydrogen sulfide toxicity of especially sulfate is great, has stronger biocidal power to aquatic organisms, under the not enough condition of ventilation condition, when its gathering to certain concentration, can produce to poison operating personnel about, in addition, after the waste water discharge water that contains the sulphide, can react with the iron class metal in the water, make the water foul and blacken. The acidic waste water can also destroy the soil structure and reduce the crop products. The latent period of the sulfate wastewater is long, and although the sulfate wastewater has a natural dilution effect and does not have obvious negative effects in a short time, once large-area pollution is caused, the treatment difficulty is increased. If appropriate treatment measures are taken, the waste water is changed into reusable water resources, so that the coordinated development of economy and environment is greatly promoted, and therefore, the national emission standard of sulfide waste water is strict.

In a biochemical system for sewage treatment, the harm of sulfate is not small, the sulfate is one of inorganic salts, and the inorganic salts play important roles in promoting enzyme reaction, maintaining membrane balance and regulating osmotic pressure in the microbial growth process. However, the salt concentration is too high, which can inhibit the growth of microorganisms, and the main reasons are that: (1) when the salt concentration is too high, the osmotic pressure is high, so that microbial cells are dehydrated, and the separation of cell protoplasm is caused; (2) in the case of high salt concentration, the salting-out action causes a decrease in dehydrogenase activity; (3) because the density of water is increased, the activated sludge is easy to float and run off. The harm in an anaerobic system is embodied in that firstly, the anaerobic method is adopted to treat high-concentration sulfate organic wastewater, and the intervention of the reduction reaction of sulfate causes the generation of armor in the anaerobic degradation processAlkane bacteria (MPB) and Sulfate Reducing Bacteria (SRB) compete for the substrate and sulfate reduction product (sulfide) produces toxicity inhibition on MPB and SRB, resulting in reduced microbial activity and, in severe cases, even complete destruction of the treatment system. ② the tolerance range of anaerobic to sulfate is less than 2000mg/L, and COD/SO is required₄ ^2-The ratio is greater than 2.5. The harm of good oxygen is reflected in that firstly, high sulfide can influence the sludge activity, and excessively high concentration can cause excessive propagation of filamentous sulfur bacteria, so that the filamentous sulfur bacteria swell, even cause sludge poisoning, cause serious influence on sewage treatment and cause the effluent quality to deteriorate.

For this reason, biological treatment of high-concentration salt-containing wastewater requires dilution of the wastewater to a salt mass fraction of less than 1%. This results in waste of water resources, large treatment facilities, increased investment and increased operating costs. With the increasing shortage of water resources, the implementation of various water resource protection laws and regulations and charging measures in China brings burden to enterprises treating high-concentration salt-containing wastewater.

The traditional methods for removing sulfate on the market at present are a barium chloride method, a calcium chloride method, an ion exchange resin method, a deep freezing method, an electrolysis method, an incineration method and a membrane method.

Most of the treatment methods belong to physical and chemical methods, the cost is high, the number of byproducts is large, the operation cost is high, the generated byproducts have no good solution, and due to high sulfate, the treatment of pollutants is changed into pollution production due to the fact that the system is difficult to reach the standard, and the environmental treatment cost is increased.

SUMMERY OF THE UTILITY MODEL

To the problem that prior art exists, the utility model provides a get rid of reaction unit of sulphate in waste water.

The technical scheme of the utility model is that:

the utility model provides a get rid of reaction unit of sulphate in waste water, includes reactor, agitator, water inlet, delivery port and closing plate, reactor formula tempering structure as an organic whole, the agitator is installed in the reactor, the both sides wall in the reactor is installed respectively to water inlet and delivery port, the closing plate is installed in the reactor top.

Preferably, the reactor comprises a hydrolysis acidification tank, a stripping aeration tank and a sedimentation tank, the stirrer is installed in the hydrolysis acidification tank of the reactor, the water inlet is installed on the side wall of the hydrolysis acidification tank of the reactor, and the water outlet is installed on the side wall of the sedimentation tank of the reactor.

Preferably, the number of the stirrers is 2, and the stirrers are respectively arranged at two sides of the hydrolysis acidification tank.

Preferably, a slag discharge pipe is arranged at the bottom of the sedimentation tank.

Preferably, the inner wall of the reactor is provided with an epoxy resin anticorrosive layer.

Adopt the technical scheme of the utility model, following beneficial effect has:

1. the process of treating the hydrogen sulfide does not need filler, microorganism, nutritive salt or chemical reagent, and has low cost, little pollution, high efficiency and safety;

2. the hydrogen sulfide is oxidized into elemental sulfur, so that the possible secondary pollution is avoided;

3. the concentration of hydrogen sulfide is minimized through multiple cycles, and the desulfurization efficiency can reach more than 98%;

4. the sulfur product can be recycled.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a front view of the present invention;

fig. 3 is a side view of the present invention;

FIG. 4 is a schematic diagram of the catabolism of the sulfate-reducing bacteria of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 3, the utility model provides a get rid of reaction unit of sulphate in waste water, including reactor 1, agitator 2, water inlet 3, delivery port 4 and

closing plate

5, 1 formula tempering structure as an organic whole of reactor, agitator 2 installs in the reactor, the both sides wall in the reactor is installed respectively in water inlet 3 and delivery port 4, closing plate 5 is installed at reactor 1 top.

The reactor 1 comprises a hydrolysis acidification tank 101, a stripping aeration tank 102 and a sedimentation tank 103, the stirrer 2 is arranged in the hydrolysis acidification tank 101 of the reactor 1, the water inlet 3 is arranged on the side wall of the hydrolysis acidification tank 101 of the reactor 1, and the water outlet 4 is arranged on the side wall of the sedimentation tank 103 of the reactor 1.

The number of the stirrers 2 is 2, and the stirrers are respectively arranged at two sides of the hydrolysis acidification tank 101.

And a slag discharge pipe 6 is arranged at the bottom of the sedimentation tank 103.

And an epoxy resin anticorrosive layer 7 is arranged on the inner wall of the reactor 1.

The utility model discloses the theory of operation does: the utility model discloses a reaction unit is applicable to the sulphate and is higher than 2000 mg/L's waste water, and concrete processing flow is: hydrolysis acidification tank + aeration blows off pond + sedimentation tank, entire system structure scribbles the anticorrosive steel structure integration equipment of epoxy inside.

The principle of the hydrolysis acidification process is as follows:

(1) the Sulfate Reducing Bacteria (SRB) generally refers to a type of bacteria capable of performing sulfate reduction through dissimilation, has strong growth capability with important physiological characteristics, and is widely present in the natural world such as paddy fields, lakes, marshes, river bottom mud and the like. In recent years, 15 SRB species have been successfully mastered, of which 9 are used for wastewater treatment, and the main 2 are Desultorily and Stratocumulus of gram-negative bacteria.

Hydrogen and organic matters are used as electron donors, sulfate radicals, sulfite radicals and sulfur are used as electron acceptors, and energy required for synthesizing cell substances and maintaining survival is obtained through the dissimilation of the organic matters. The metabolic process of sulfate-reducing bacteria is divided into three stages, and referring to FIG. 4, the catabolic process of sulfate-reducing bacteria is illustrated.

First, in the decomposition stage, organic matter is decomposed in anaerobic environment and small amount of ATP is produced

② electron transfer stage, high-energy electrons generated in the previous stage are transferred step by step through electron transfer chain (such as cytochrome C3, etc.) of SRB to generate more ATP

And thirdly, in the oxidation stage, electrons are transferred to the sulfur element in an oxidation state, the sulfur element is reduced into sulfur ions, and meanwhile, the energy provided by ATP is consumed.

(2) The anaerobic reaction system is divided into four stages, namely, a hydrolysis stage: due to the large molecular volume of the macromolecular organic matter, the macromolecular organic matter can not directly pass through the cell wall of anaerobic bacteria, and needs to be decomposed into small molecules by extracellular enzymes outside microorganisms. Typical organic substances in wastewater such as cellulose are decomposed into cellobiose and glucose by cellulase, starch is decomposed into maltose and glucose, and protein is decomposed into short peptides and amino acids. The decomposed small molecules can enter the cell body through the cell wall to be decomposed in the next step.

The acidification stage: the small molecule organic matter enters the cell body to be converted into simpler compounds and is distributed outside the cell, and the main product of the stage is Volatile Fatty Acid (VFA), and meanwhile, partial products such as alcohols, lactic acid, carbon dioxide, hydrogen, ammonia, hydrogen sulfide and the like are generated.

③ the acetic acid production stage: at this stage, the product of the last step is further converted into acetic acid, carbonic acid, hydrogen and new cellular material.

Fourthly, methane production stage: at this stage, acetic acid, hydrogen, carbonic acid, formic acid and methanol are all converted to methane, carbon dioxide and new cellular material. This phase is also the most important phase of the whole anaerobic process and the rate-limiting phase of the whole anaerobic reaction process.

In the four stages, the reactions in the first two stages are completed in the same bacterial species.

(3) COD is degraded in the anaerobic system, one third of the COD is removed by hydrogen, the other third of the COD is removed by acetic acid, and SRB greatly exceeds MPB in the utilization capacity of hydrogen, so that the SRB can completely utilize the hydrogen, but the SRB and the MPB have the same utilization capacity of the acetic acid, and the SRB is not easy to lose in the anaerobic system, so the SRB is not easy to compete with the MPB in the environment in the anaerobic system. So the proportion of the anaerobic system is not high.

(4) SRB requires ORP less than-100 mv, MPB requires ORP less than-300 mv. The residence time, which is thus reflected in the cost, is considerably reduced.

In conclusion, the hydrolysis acidification process is selected, so that the problem of environmental competition between SRB and MPB can be solved, and the sulfate can be reduced by effectively utilizing the stage. The sludge yield is low, the operation cost is saved, and a large amount of organic carbon sources do not need to be additionally supplemented for the wastewater with low COD/SO 42-ratio.

The aeration stripping tank process principle is as follows:

(1) in the sulfate reduction reaction, 52-64% of sulfide is dissolved sulfur in the liquid phase, and 21-26% of sulfide is in the gas phase. The sulphate after hydrolytic acidification exists mainly in the form of free sulphide.

(2) Adding an oxidant such as oxygen to make H₂S oxidation, which occurs simultaneously with the aeration treatment, the reaction is as follows:

H₂S+1/2O₂＝H₂O+S↓

the process principle of the sedimentation tank is as follows:

(1) the photosynthetic bacteria can utilize sunlight, and can convert H₂S, oxidizing elemental sulfur to SO₄ ^2－2S+3O₂+2H₂O≒2H₂SO₄

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. The utility model provides a remove reaction unit of sulphate in waste water which characterized in that: the reactor is of an integrated toughening structure, the stirrer is installed in the reactor, the water inlet and the water outlet are respectively installed on two side walls of the reactor, and the sealing plate is installed at the top of the reactor.

2. The reaction device for removing sulfate in wastewater according to claim 1, wherein: the reactor comprises a hydrolysis acidification tank, a stripping aeration tank and a sedimentation tank, the stirrer is arranged in the hydrolysis acidification tank of the reactor, the water inlet is arranged on the side wall of the hydrolysis acidification tank of the reactor, and the water outlet is arranged on the side wall of the sedimentation tank of the reactor.

3. The reaction device for removing sulfate in wastewater according to claim 2, wherein: the number of the stirrers is 2, and the stirrers are respectively arranged on two sides of the hydrolysis acidification tank.

4. The reaction device for removing sulfate in wastewater according to claim 2, wherein: and a row of slag discharge pipes are arranged at the bottom of the sedimentation tank.

5. The reaction device for removing sulfate in wastewater according to claim 1, wherein: and an epoxy resin anticorrosive layer is arranged on the inner wall of the reactor.