CN218810904U - Medium-strong acid molecular sieve wastewater treatment device - Google Patents

Abstract

The utility model relates to a molecular sieve effluent treatment plant especially relates to a well strong acid molecular sieve effluent treatment plant. The utility model discloses can release the ammonia nitrogen with organic amine ammoniation decomposition, and turn into organic acid, be favorable to follow-up further processing, the device running cost is low, generates the ammonium sulfate and can be used to production, improves economic benefits. The utility model discloses a homogeneity pond, flocculation reaction tank, high density sedimentation tank, anaerobic hydrolysis pond, first sedimentation tank, first pH equalizing basin, second sedimentation tank, filter, hollow fiber membrane reactor, second pH equalizing basin, AO pond, two sedimentation tanks and clean water basin that connect gradually, the filter outlet end communicates with the tube side feed liquor end of hollow fiber membrane reactor, the tube side play liquid end and the second pH equalizing basin intercommunication of hollow fiber membrane reactor, be equipped with ammonia neutralization mechanism on the shell side of hollow fiber membrane reactor.

Description

Medium-strong acid molecular sieve wastewater treatment device

Technical Field

The utility model relates to a molecular sieve effluent treatment plant especially relates to a well strong acid molecular sieve effluent treatment plant.

Background

The medium-strong acid molecular sieve wastewater is different from the traditional molecular sieve wastewater, does not contain ammonia nitrogen with higher concentration, but contains organic amine with higher concentration, and the case that the wastewater treatment is not successful can be used for reference; in addition, the ammonia nitrogen concentration of the traditional molecular sieve wastewater is high, the ammonia nitrogen is generally removed by an air stripping method after the pH is adjusted by adding alkali, but the medium-strong acid molecular sieve wastewater contains organic amine and is not suitable for being treated by an alkali stripping process; the medium-strong acid molecular sieve wastewater contains high-concentration organic amine, and besides high total nitrogen, the COD concentration is also very high, which brings difficulty to the treatment.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in providing a well strong acid molecular sieve effluent treatment plant, can decompose organic amine ammoniation, release the ammonia nitrogen, and turn into organic acid, be favorable to follow-up further processing, the device running cost is low, generates the ammonium sulfate and can be used to production, improves economic benefits.

Well strong acid molecular sieve effluent treatment plant including homogeneity pond, flocculation reaction tank, high density sedimentation tank, anaerobic hydrolysis pond, first sedimentation tank, first pH equalizing basin, second sedimentation tank, filter, hollow fiber membrane reactor, second pH equalizing basin, AO pond, two sedimentation tanks and the clean water basin that connects gradually, filter outlet end and hollow fiber membrane reactor's tube side feed liquor end intercommunication, hollow fiber membrane reactor's tube side play liquid end and second pH equalizing basin intercommunication, be equipped with ammonia neutralization mechanism on hollow fiber membrane reactor's the shell side.

Flocculating and precipitating the wastewater to remove suspended matters and prevent the pollution and blockage of subsequent equipment; the wastewater with suspended matters removed enters an anaerobic hydrolysis tank, organic amine is converted into free ammonia, and partial COD and total nitrogen are removed at the same time; part of organic matters are converted into organic acid, which is beneficial to subsequent biochemical treatment; adding lime milk into the effluent of the anaerobic hydrolysis tank to adjust the pH value to 11.5, removing the precipitate of silica gel in the form of calcium silicate, and simultaneously adding sodium carbonate to remove the residual calcium ions; adding a flocculating agent for flocculation and precipitation, and removing calcium silicate, calcium carbonate and other suspended matters through precipitation; and (3) continuously treating the wastewater AO from which most of ammonia is removed, wherein COD is mainly removed, and ammonia nitrogen and total nitrogen are removed at the same time until the emission requirement is met. The residual ammonia nitrogen in the wastewater treated by the hollow fiber membrane reactor is a nutrient substance for biochemical treatment.

Preferably, the exhaust end of the anaerobic hydrolysis tank is connected with an alkaline washing tower through a pipeline, and the outlet end of the alkaline washing tower is connected with the AO tank through a pipeline.

And (3) introducing the hydrogen sulfide into an alkaline tower to remove the hydrogen sulfide, preventing the surrounding environment from being polluted, and sending the obtained sodium sulfide to a subsequent AO pool to be oxidized into sodium sulfate which is discharged along with water.

Preferably, the ammonia neutralizing mechanism comprises a dilute sulfuric acid storage tank communicated with the shell-side liquid inlet end of the hollow fiber membrane reactor; and an ammonium sulfate storage tank communicated with the shell pass liquid outlet end of the hollow fiber membrane reactor; and the dilute sulfuric acid storage tank is connected with the shell side liquid inlet end of the hollow fiber membrane reactor through an acid-resistant pump.

The wastewater without suspended matters enters a tube pass of the hollow fiber membrane reactor, the hollow membrane is hydrophobic and only permeable and impermeable, ammonia in the wastewater penetrates through micropores on the surface of the membrane to reach the outer side of the membrane, namely a shell pass, and reacts with dilute sulfuric acid to generate ammonium sulfate, and most of the ammonia in the wastewater penetrates through the membrane to remove the ammonium sulfate. When the concentration of the dilute sulfuric acid is reduced, new dilute sulfuric acid can be supplemented, and the ammonium sulfate solution with higher concentration can be obtained through continuous recycling, and can be recycled for molecular sieve production.

Preferably, the slag discharging ends of the high-density sedimentation tank and the first sedimentation tank are connected with the sediment concentration tank.

The beneficial effects of the utility model are that:

1. the organic amine is ammoniated and decomposed by adopting an anaerobic hydrolysis acidification process to release ammonia nitrogen, and meanwhile, organic matters are converted into organic acid, so that the subsequent further treatment is facilitated, and the operation cost of anaerobic acidification hydrolysis is low;

2. the pH value of the acidified sewage is adjusted to 11.5 by lime milk, the ionic ammonium is converted into free ammonia, and meanwhile, calcium ions react with silicate radicals to generate water-insoluble calcium silicate, so that the cost is low, and two beneficial effects are generated;

3. the hollow fiber membrane reactor is adopted to remove ammonia, the efficiency is high, the occupied area is small, the generated ammonium sulfate can be used for production, and the economic benefit is improved;

4. the wastewater after ammonia nitrogen removal is subjected to biochemical treatment to remove COD, ammonia nitrogen and total nitrogen, so that the COD removal is mainly performed, and the treatment difficulty is greatly reduced.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment;

in the figure: 1. a homogenizing tank; 2. a flocculation reaction tank; 3. a high-density sedimentation tank; 4. an anaerobic hydrolysis tank; 5. a first sedimentation tank; 6. a first pH adjusting tank; 7. a second sedimentation tank; 8. a filter; 9. a hollow fiber membrane reactor; 10. a second pH adjusting tank; 11. an AO cell; 12. a secondary sedimentation tank; 13. a clean water tank; 14. an alkaline washing tower; 15. a dilute sulfuric acid storage tank; 16. an ammonium sulfate storage tank; 17. an acid-resistant pump; 18. and a sediment concentration tank.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in figure 1, well strong acid molecular sieve effluent treatment plant including homogeneity pond 1, flocculation reaction tank 2, high density sedimentation tank 3, anaerobic hydrolysis tank 4, first sedimentation tank 5, first pH equalizing basin 6, second sedimentation tank 7, filter 8, hollow fiber membrane reactor 9, second pH equalizing basin 10, AO pond 11, two sedimentation tanks 12 and clean water basin 13 that connect gradually, the filter outlet end communicates with the tube side inlet end of hollow fiber membrane reactor, the tube side outlet end and the second pH equalizing basin 10 intercommunication of hollow fiber membrane reactor, be equipped with ammonia neutralization mechanism on the shell side of hollow fiber membrane reactor. The exhaust end of the anaerobic hydrolysis tank 4 is connected with an alkaline washing tower 14 through a pipeline, and the outlet end of the alkaline washing tower 14 is connected with the AO tank 11 through a pipeline. The ammonia neutralizing mechanism comprises a dilute sulfuric acid storage tank 15 communicated with the shell pass liquid inlet end of the hollow fiber membrane reactor 9; and an ammonium sulfate storage tank 16 communicated with the shell pass liquid outlet end of the hollow fiber membrane reactor 9; the dilute sulfuric acid storage tank 15 is connected with the shell side liquid inlet end of the hollow fiber membrane reactor 9 through an acid-proof pump 17. The slag discharging ends of the high-density sedimentation tank 3 and the first sedimentation tank 4 are connected with a slag concentrating tank 18.

The utility model discloses a use as follows: the method comprises the steps that medium-strong acid molecular sieve wastewater enters a flocculation reaction tank after the water quantity and the water quality are regulated by a homogenizing tank, coagulant and flocculant are added into the flocculation reaction tank through flocculation, stirring reaction is carried out to remove suspended matter in water, then the water passes through a high-density sedimentation tank, upper-layer liquid enters an anaerobic hydrolysis tank, under the action of anaerobic bacteria, organic nitrogen compounds are decomposed to release ammonia, meanwhile, organic matters are converted and degraded, sulfate radicals in the wastewater are reduced to hydrogen sulfide, the hydrogen sulfide is led into an alkaline tower to be removed, the surrounding environment is prevented from being polluted, the obtained sodium sulfide is sent to a subsequent AO tank to be oxidized into sodium sulfate, and the sodium sulfate is discharged along with water. The effluent of the anaerobic hydrolysis tank sequentially enters a first sedimentation tank and a first pH adjusting tank, lime milk is added into the first pH adjusting tank to adjust the pH value to 11.5, ammonium ions are converted into free ammonia, meanwhile, calcium ions react with silicate in wastewater to generate calcium silicate, the calcium silicate is removed by a second sedimentation tank, in order to prevent silica gel from causing fouling on subsequent equipment, sodium carbonate is added to react with the rest calcium ions to generate calcium carbonate precipitate, the calcium carbonate precipitate is removed by the second sedimentation tank, then, fine particulate matters are removed by the wastewater through a filter, the effluent enters a tube pass of a hollow fiber membrane reactor, ammonia in the water reaches the outer side of the membrane, namely a shell pass through micropores on the surface of an ammonia membrane, the ammonia passes through the micropores on the liquid inlet side of the hollow fiber membrane reactor to be neutralized and reacted with dilute sulfuric acid at the liquid inlet side of the shell pass of the hollow fiber membrane reactor to generate ammonium sulfate, the ammonium sulfate enters a storage tank through the shell pass, the wastewater for removing ammonia is still alkaline, the effluent passes through the second pH adjusting tank, the pH adjusting tank is added with acid to adjust the pH value to 7.0-8.0, the effluent enters an AO pool, the effluent further removes ammonia, the ammonia nitrogen and the total nitrogen, the COD effluent passes through a COD tank to be separated, and the supernatant enters a clear water tank.

Of course, the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and the technical field of the present invention is equivalent to the changes and improvements made in the actual range of the present invention, which should be attributed to the patent coverage of the present invention.

Claims (4)

1. A medium-strong acid molecular sieve wastewater treatment device is characterized by comprising: the device comprises a homogenizing tank (1), a flocculation reaction tank (2), a high-density sedimentation tank (3), an anaerobic hydrolysis tank (4), a first sedimentation tank (5), a first pH adjusting tank (6), a second sedimentation tank (7), a filter (8), a hollow fiber membrane reactor (9), a second pH adjusting tank (10), an AO tank (11), a secondary sedimentation tank (12) and a clean water tank (13), wherein the water outlet end of the filter is communicated with the tube pass liquid inlet end of the hollow fiber membrane reactor, the tube pass liquid outlet end of the hollow fiber membrane reactor is communicated with the second pH adjusting tank (10), and an ammonia neutralizing mechanism is arranged on the shell pass of the hollow fiber membrane reactor.

2. The medium strong acid molecular sieve wastewater treatment device according to claim 1, characterized in that: the exhaust end of the anaerobic hydrolysis tank (4) is connected with an alkaline washing tower (14) through a pipeline, and the outlet end of the alkaline washing tower (14) is connected with an AO tank (11) through a pipeline.

3. The medium strong acid molecular sieve wastewater treatment device according to claim 1 or 2, characterized in that: the ammonia neutralizing mechanism comprises a dilute sulfuric acid storage tank (15) communicated with the shell pass liquid inlet end of the hollow fiber membrane reactor (9); and an ammonium sulfate storage tank (16) communicated with the shell pass liquid outlet end of the hollow fiber membrane reactor (9); and the dilute sulfuric acid storage tank (15) is connected with the shell pass liquid inlet end of the hollow fiber membrane reactor (9) through an acid-proof pump (17).

4. The medium strong acid molecular sieve wastewater treatment device according to claim 3, characterized in that: the slag discharging ends of the high-density sedimentation tank (3) and the first sedimentation tank (5) are connected with a slag concentration tank (18).

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