TW201425236A - Method for treating wastewater - Google Patents

Abstract

A method for treating wastewater is provided, comprising introducing an ammonia-containing wastewater into a biological rector having an anammox area, a denitrification area, and a separating structure for separating the two areas, wherein an ammonia nitrogen component is produced by introducing and reacting the ammonia-containing wastewater in the anammox area react; and allowing the reacted ammonia-containing wastewater and nitrate nitrogen to get into the denitrification area where a denitrification is conducted.

Description

Wastewater treatment method

The invention relates to a wastewater treatment method, in particular to an anaerobic ammonium oxidation treatment method for ammonia-containing wastewater.

Ammonia nitrogen wastewater with high ammonia nitrogen and low organic matter concentration is usually found in high-tech industries such as semiconductor manufacturing or LED manufacturing. Because of its process, mainly using ammonia gas or ammonia water, the high concentration ammonia nitrogen wastewater generated is discharged into the wastewater treatment plant for treatment. As for the current status of the traditional nitrification/denitrification process, the efficiency of nitrification is relatively low, and the equipment covers a large area, so it is difficult to meet the discharge water standard regulated by regulations.

The traditional ammonia nitrogen biological treatment method is nitrification-denitration, which must undergo a series of biological reactions, including ammonia oxidation bacteria (AOB) to oxidize ammonia nitrogen to nitrite nitrogen; followed by nitrite oxidation bacteria , NOB) oxidizes nitrite to form nitrate nitrogen; finally, the reduction of nitrite to nitrogen by denitrifying bacteria is completed. However, the overall operation of the processing method is relatively energy intensive and the operating cost is high.

Another ammonia nitrogen treatment method is the anammox process, which uses carbon dioxide (CO ₂ ) existing in nature as a carbon source under anaerobic conditions, directly using ammonia nitrogen as an electron supplier, and nitrite nitrogen as an electron. Recipients, the process of trivalent electron transport reaction to generate nitrogen, does not have to cost extra cost and energy as the traditional nitrogen removal process, without the need to provide a large amount of oxygen to convert ammonia nitrogen into nitrate nitrogen, and does not need to provide organic carbon source. Denitrification reaction. The biochemical reaction of anaerobic ammonium oxidation is: NH ₄ ⁺ +1.32NO ₂ ^- +0.066HCO ₃ ^- +0.13H ⁺ →1.02N ₂ +0.26NO ₃ ^- +0.066CH ₂ O _0.5 N _0.15 +2.03H ₂ O

However, after the above biochemical reaction is carried out in the anaerobic ammonium oxidation unit, an additional nitrogen removal unit is usually required to reduce the concentration of the nitrogen nitrate to ensure that the treated water can meet the regulatory standards of total nitrogen or nitrate nitrogen. Since the denitrification device requires additional organic matter as a denitrification carbon source, it is not possible to separate solid and liquid sludge through a single sedimentation device. Since the sludge needs to be domesticated, if the sludge cannot be effectively recovered, the efficiency of wastewater treatment is improved and the wastewater is improved. cost.

The present disclosure provides a wastewater treatment method comprising: introducing ammonia-containing wastewater and nitrite into a biological rector having an anaerobic ammonium oxidation zone and a denitrification zone connected to each other, the anaerobic ammonium oxidation The zone and the denitrification zone are separated by a separation structure, and the anaerobic ammonium oxidation zone has a self-operated organism, and the denitrification zone has a heterotrophic organism, wherein the ammonia-nitrogen-containing wastewater and the nitrite nitrogen system are introduced into the zone The anaerobic ammonium oxidation zone is reacted to generate nitrogen and nitrogen nitrate; and the reacted ammonia-containing nitrogen wastewater is introduced into the denitrification zone from the anammox zone, and the nitrate nitrogen is introduced into the denitrification zone for removal Nitrogen reaction.

Other embodiments of the present invention will be readily understood by those skilled in the art from this disclosure.

Please refer to Figure 1 for a schematic diagram of the wastewater treatment method.

The wastewater treatment method provided by the present disclosure is carried out in a bioreactor 1 having an anaerobic ammonium oxidation zone 10 and a denitrification zone 12 which are connected to each other, and the anaerobic ammonium oxidation zone 10 in the single bioreactor 1 The nitrogen zone 12 is separated by a separation structure 14. The wastewater treatment method comprises introducing ammonia-containing wastewater W and nitrite into the anammox zone 10 to produce nitrogen and nitrate nitrogen; and reacting the reacted ammonia-containing wastewater W' from the anammox zone 10 enters the denitrification zone 12 and causes the nitric acid nitrogen to enter the denitrification zone 12 for a denitrification reaction.

In a specific embodiment, the molar ratio of the ammonia-nitrogen-containing wastewater to the nitrite nitrogen is in an equal ratio, or is 1:1.32.

On the other hand, after the biochemical reaction by anaerobic ammonium oxidation, the remaining nitrate nitrogen is about 1/8 of the total nitrogen, and in the bioreactor, the volume of the denitrification zone 12 can be smaller than the anaerobic ammonium oxidation zone 10 The volume.

In the wastewater treatment, the anaerobic ammonium oxidation zone has a self-supporting organism, such as an anaerobic ammonium oxidizing microorganism, and the denitrification zone has a meta-organism, for example, a denitrifying bacteria. In a specific embodiment, the self-operated organism is present in non-granulated sludge or anaerobic granular sludge. In addition, the sludge is domesticated to the extent that it can be treated with wastewater. Since the method of domestication is known to those of ordinary skill in the art, it is not described herein.

After the ammonia-containing nitrogen wastewater W is introduced into the anaerobic ammonium oxidation zone 10, the reacted ammonia-containing nitrogen wastewater W' is introduced into the denitrification zone 12 from the anammox zone 10 at a flow rate of 8 to 18 m/hr. Generally speaking, the total amount of water that can be fed into the wastewater pump and the return pump can reach the preset flow rate value.

In a specific embodiment, the self-operated organism is present in the non-granulated sludge, and the non-granulated sludge comprises a plurality of activated carbon particles. The non-granulated sludge comprises a plurality of activated carbon particles, which can be used as a carrier for self-supporting organisms, and the weight of the self-operated organisms is prevented from being brought to the denitrification zone 12.

In one embodiment, the plurality of activated carbon particles have a particle size between 15 and 25 mesh.

In a specific embodiment, when the self-operated biological system is present in the non-granulated sludge, the reacted ammonia-containing nitrogen wastewater W' is controlled to enter the anaerobic ammonium oxidation zone 10 at a flow rate of 13 to 18 m/hr. The denitrification zone 12.

In another embodiment, the self-operated biological system is present in the anaerobic granular sludge, and the reacted ammonia-containing nitrogen wastewater is introduced into the anaerobic ammonium oxidation zone at a flow rate of 8 to 12 m/hr. Nitrogen zone.

In yet another embodiment, the meta-organism, such as a denitrifying microorganism, is present in the non-granulated sludge and/or the granulated sludge.

In addition, in the wastewater treatment method of the present disclosure, a carbon source is added to the denitrification zone 12. For example, methanol or isopropanol is added to the denitrification zone 12 using a line 15 to serve as a carbon source for the denitrification microorganism.

Referring to Figure 2, another embodiment of a wastewater treatment process is illustrated.

As shown in Fig. 2, the bioreactor is a erected column or column in which the anaerobic ammonium oxidation zone 10 and the denitrification zone 12 are also separated by a separation structure 14. Therefore, in the present embodiment, the anaerobic ammonium oxidation zone 10 is located below the denitrification zone 12.

In addition, the volume of the denitrification zone 12 is smaller than the anaerobic ammonium oxidation zone 10 volume. For example, the volume ratio of the volume of the denitrification zone 12 to the anammox zone 10 is from 1:8 to 1:10.

In still another non-limiting embodiment, the bioreactor 2 has a further separation structure 14' such that the denitrification zone 12 is located between the two separation structures 14, 14'.

In a specific embodiment, the separation structure 14, 14' includes: a plate body 140 fixed to the inner wall of the bioreactor 2, having a plurality of holes 1401; a plurality of gas barrier tubes 141, each of the gas barrier tubes 141 being connected The hole 1401; and the plurality of blocking members 142 are correspondingly disposed under the gas blocking tube 141, and have a gap d between the gas blocking tube 141 and the blocking member 142. In the specific implementation of the separating structure 14, 14', the blocking member 142 can be fixed to the plate body 140 or the inner wall of the bioreactor 2, and can be fixed by an elongated metal member or a plastic connecting member (not shown). ).

Referring to FIG. 3, the plate body 140 and the gas barrier tube 141 are illustrated in a perspective view, and each of the gas barrier tubes 141 is disposed on the bottom surface of the plate body 140 correspondingly to the hole 1401.

In a non-limiting embodiment of FIG. 2, the bioreactor 2 has a sloping plate 16 such that the denitrification zone 12 is located between the separation structure 14 and the sloping plate 16, wherein the sloping plate 16 is damped A solid, such as a denitrified sludge, is passed through the inclined plate 16.

In addition, in an embodiment, the self-operated biological system is present in the anaerobic sludge, so that the bottom of the denitrification zone 12 in the bioreactor, that is, the first return line above the separation structure 14 18, and through the transport of the pump P, the anaerobic sludge rising to the denitrification zone 12 is returned to the anaerobic ammonia Zone 10.

Moreover, the heterogeneous organism is present in the denitrification sludge, so that the top of the denitrification zone 12 has a second return line 19 and can be transported through the pump P, and the helium will rise to the other separation structure 14 The upper denitrified sludge is returned to the denitrification zone 12. On the other hand, methanol or isopropyl alcohol used as a carbon source can also be introduced into the denitrification zone 12 through the second reflux line 19 to serve as a carbon source required for the denitrification microorganism.

Example

Wastewater treatment test using a bioreactor containing an anaerobic ammonium oxidation zone (40 L in volume) and a denitrification zone (5 L in volume) above the oxyammoxidation zone, wherein the anaerobic ammonium oxidation zone Implanted anaerobic ammonium oxidizing microorganisms (such as Candidatus Kuenenia stuttgartiensis; Candidatus Anammoxoglobus propionicus; Candidatus Jettenia asiatica; Candidatus Brocadia fulgida; Candidatus Brocadia anammoxidans and other genus), which are domesticated in anaerobic granular sludge; A denitrifying microorganism that is domesticated in non-granulated sludge or anaerobic granular sludge. And the reacted ammonia-containing nitrogen wastewater is introduced into the denitrification zone from the anaerobic ammonium oxidation zone at a flow rate of 8 m/hr, wherein the ammonia nitrogen concentration and the nitrite nitrogen concentration of the ammonia-nitrogen-containing wastewater to be treated are 240 mg/L. And 260 mg/L. The average treatment capacity of the bioreactor was 60 mL/min, which was converted to a total nitrogen load of about 1 kg N/m ³ -d. The concentration index of the pollutants in the inflow and outflow water of the bioreactor according to the present invention is as shown in Fig. 4, wherein the data is analyzed once a week to obtain six sets of results.

As shown in Figure 4, even if the ammonia nitrogen and nitrite concentrations in the influent water are as high as 260 mg/L and 300 mg/L, the ammonia nitrogen and nitrite nitrogen concentrations in the reactor outlet water are reduced to less than 30 mg/L, respectively. The target pollutant removal rate can reach more than 90%. Further, this reaction theoretically produces about 56 mg/L of nitrate nitrogen, but by the method of the present disclosure, the nitrate nitrogen in the reactor outlet water is only about 2 mg/L.

The above embodiments are intended to illustrate the principles of the disclosure and its functions, and are not intended to limit the disclosure. Any person skilled in the art can modify the above embodiments without departing from the spirit and scope of the disclosure. Therefore, the scope of protection of the present disclosure should be as set forth in the scope of the patent application described later.

1,2‧‧ bioreactor

10‧‧‧ Anaerobic ammonium oxidation zone

12‧‧‧Denitration zone

14,14’‧‧ separate structure

140‧‧‧ board

1401‧‧‧ holes

141‧‧‧Stem tube

142‧‧‧blocks

15‧‧‧pipe

16‧‧‧ sloping plate

18‧‧‧First return line

19‧‧‧Second return line

W‧‧‧Ammonia-nitrogen wastewater

W’‧‧‧Reacted ammonia-containing wastewater

D‧‧‧ gap

P‧‧‧ pump

1 is a schematic view showing a wastewater treatment method; and FIG. 2 is a schematic view showing a wastewater treatment method according to an embodiment of the present invention; and FIG. 3 is a perspective view showing a plate body and a gas barrier pipe of the separation structure; and FIG. The concentration of the pollutants treated by the disclosed wastewater treatment method is shown.

1‧‧‧Bioreactor

10‧‧‧ Anaerobic ammonium oxidation zone

12‧‧‧Denitration zone

14‧‧‧Separate structure

15‧‧‧pipe

W‧‧‧Ammonia-nitrogen wastewater

W’‧‧‧Reacted ammonia-containing wastewater

Claims (18)

A wastewater treatment method comprising: introducing ammonia-containing nitrogen wastewater and nitrite nitrogen into a biological rector having an anaerobic ammonium oxidation zone and a denitrification zone which are connected to each other, the anaerobic ammonium oxidation zone and the desorption zone The nitrogen zone is separated by a separation structure, and the anaerobic ammonium oxidation zone has a self-operating organism, and the denitrification zone has a heterogeneous organism, wherein the ammonia-nitrogen-containing wastewater and the nitrite nitrogen are introduced into the anaerobic ammonia. The oxidation zone is reacted to produce nitrogen and nitrogen nitrate; and the reacted ammonia-containing nitrogen wastewater is passed from the anammox zone to the denitrification zone, and the nitrate nitrogen is introduced into the denitrification zone for denitrification. The wastewater treatment method according to claim 1, wherein the reacted ammonia-containing nitrogen wastewater is introduced into the denitrification zone from the anammox zone at a flow rate of 8 to 18 m/hr. The wastewater treatment method according to claim 1, wherein the anaerobic ammonium oxidation zone is located below the denitrification zone. The wastewater treatment method according to claim 1, wherein the volume of the denitrification zone is smaller than the volume of the anammox zone. The wastewater treatment method according to claim 1, wherein a volume ratio of the volume of the denitrification zone to the anammox zone is 1:8 to 1:10. The wastewater treatment method according to claim 1, wherein the self-operated biological system is present in non-granulated sludge or anaerobic granular sewage. mud. The wastewater treatment method according to claim 6, wherein the self-operated biological system is present in the non-granulated sludge, and the non-granulated sludge comprises a plurality of activated carbon particles. The wastewater treatment method according to claim 7, wherein the plurality of activated carbon particles have a particle diameter of 15 to 25 mesh. The wastewater treatment method according to claim 7, wherein the reacted ammonia-containing nitrogen wastewater is introduced into the denitrification zone from the anammox zone at a flow rate of 13 to 18 m/hr. The wastewater treatment method according to claim 6, wherein the self-operated biological system is present in the anaerobic granular sludge, and the reacted ammonia-nitrogen-containing wastewater is used at a flow rate of 8 to 12 m/hr. The anaerobic ammonium oxidation zone enters the denitrification zone. The wastewater treatment method according to claim 1, wherein the heterogeneous organism is present in non-granulated sludge or anaerobic granular sludge. The method for treating wastewater according to claim 1, wherein the separation structure comprises: a plate body fixed to an inner wall of the bioreactor, having a plurality of holes penetrating; a plurality of gas barrier tubes, each corresponding to the gas barrier tube system Connecting the hole; and the plurality of blocking members are correspondingly disposed under the gas barrier tube, and have a gap between the gas barrier tube and the blocking member. The wastewater treatment method of claim 1, wherein the bioreactor has another separation structure such that the denitrification zone is located between the two separation structures. The wastewater treatment method according to claim 1, wherein the bioreactor has an inclined plate such that the denitrification zone is located between the separation structure and the inclined plate. The wastewater treatment method according to claim 1, wherein the carbon source is added to the denitrification zone. The wastewater treatment method according to claim 1, wherein the self-operated biological system is present in the anaerobic sludge, and the bottom of the denitrification zone has a first return line, and the helium will rise to the denitrification zone. The anaerobic sludge is refluxed to the anaerobic ammonium oxidation zone. The wastewater treatment method according to claim 13, wherein the meta-organism is present in the denitrification sludge, the top of the denitrification zone has a second return line, and the helium will rise to the other separation structure. The denitrified sludge is refluxed to the denitrification zone. The wastewater treatment method according to claim 1, wherein the ammonia-nitrogen-containing wastewater is in an equal ratio to the nitrite nitrogen.