CN110697999B - Device and method for synchronous sludge reduction in high-concentration nitrate wastewater treatment by pulse feeding type integrated PADEAM (polyamidoamine-activated anoxic-oxicam) process - Google Patents
Device and method for synchronous sludge reduction in high-concentration nitrate wastewater treatment by pulse feeding type integrated PADEAM (polyamidoamine-activated anoxic-oxicam) process Download PDFInfo
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Abstract
The invention discloses a device and a method for synchronously reducing sludge in high-concentration nitrate wastewater treatment by a pulse feeding type integrated PADEAM process. The method comprises the steps of inoculating denitrifying sludge and anaerobic ammonium oxidation sludge by using a sequencing batch SBR reactor, adding excess sludge into the reactor in a pulse mode, inducing short-range denitrification accumulated by high nitrite by using short-chain fatty acid generated by sludge hydrolytic fermentation as a denitrifying carbon source in an intermittent anaerobic operation mode, converting high-concentration nitrate into nitrite, providing a substrate for anaerobic ammonium oxidation, and synchronously removing ammonia nitrogen released in the sludge fermentation process. The invention can effectively solve the problems of large carbon source consumption, unstable denitrification efficiency and excessive ammonia nitrogen generated in the residual sludge treatment process in the traditional biological denitrification method for treating the high-concentration nitrate wastewater, saves organic carbon sources, reduces the sludge yield, improves the denitrification efficiency, and realizes the economic and efficient denitrification of the high-concentration nitrate wastewater, the reduction of the residual sludge and the resource utilization.
Description
The technical field is as follows:
the invention relates to a process technology for treating high-concentration nitrate wastewater and synchronously reducing sludge by an integrated short-cut denitrification coupling anaerobic ammonia oxidation (PDAMOX) process, belonging to the field of biological sewage treatment.
Background
With the increasing of water eutrophication problem and the improvement of sewage discharge standard in China, the removal of nitrogen becomes a key problem in the field of water treatment. The high-efficiency treatment of the high-concentration nitrate-containing wastewater in industrial production is an important measure for controlling the inorganic nitrogen pollution of water. At present, the methods for removing nitrate in water mainly comprise chemical reduction, reverse osmosis, electrodialysis, ion exchange, biological denitrification and the like. The chemical reduction method can be classified into an active metal reduction method and a catalytic reduction method. The former uses metal simple substances such as iron, aluminum, zinc and the like as reducing agents, has poor treatment effect and generates nitrite; the latter uses hydrogen, formic acid, methanol and the like as reducing agents, generally needs catalysts, has higher cost, and has guarantee danger in the application process of the hydrogen. Although the methods such as reverse osmosis, electrodialysis, ion exchange and the like can effectively remove the nitrate in the water, the cost is high, and a large amount of waste water is generated. The biological denitrification method is a better method which is put into practical use at present and has the characteristics of high efficiency and low consumption. However, the traditional denitrification technology still has a plurality of problems in the process of treating high-concentration nitrate wastewater: 1) achieving higher nitrate removal efficiency requires the consumption of a large amount of external carbon sources as denitrification electron donors, and increases the operation energy consumption and cost; 2) a large amount of excess sludge is generated, secondary pollution can be caused in the treatment and disposal processes, and the treatment principle of cleanness and environment friendliness is not met; 3) higher nitrite accumulation may be caused in the reduction process of nitrate with higher concentration, and the microbial activity and the denitrification efficiency are influenced; therefore, a novel nitrate wastewater treatment technology which is economical, efficient and environmentally friendly is an urgent need in the field of wastewater denitrification treatment.
On the other hand, with the increasing production of municipal sludge, the sludge treatment and disposal problem is urgent. Meanwhile, the sludge contains rich organic matters and nutrient elements such as nitrogen, phosphorus and the like, wherein part of the organic matters can generate Volatile Fatty Acids (VFAs) through anaerobic digestion, and the resource has high availability. How to more scientifically, reasonably, economically and effectively treat the sludge with large yield and complex components in a harmless and recycling manner is a key problem needing intensive research.
In recent years, anaerobic ammonia oxidation technology has become a research hotspot in the field of sewage treatment. The anaerobic ammonia oxidation process is a process for directly converting ammonia nitrogen and nitrite into nitrogen by anaerobic ammonia oxidation bacteria under an anoxic condition, does not need aeration and an organic carbon source, and has the important advantages of energy consumption and carbon source saving, low sludge yield and high denitrification load. However, the process can only use ammonia nitrogen and nitrite as substrates, and cannot be directly applied to the treatment of nitrate wastewater. Earlier researches find that short-range denitrification sludge with high nitrite accumulation can be acclimated under the sludge fermentation and denitrification coupling condition, and 80% of nitrate can be converted into nitrite, so that a new way is provided for acquiring substrate nitrite in the anaerobic ammonia oxidation process, and the economic and efficient treatment of nitrate wastewater is realized. Based on the method, the short-cut denitrification, the anaerobic ammonia oxidation and the sludge hydrolysis acid production fermentation technology are combined, the organic carbon source amount and the sludge yield required by the nitrate wastewater treatment process can be reduced, the sludge can be reduced and recycled, ammonia nitrogen released in the hydrolysis acid production process can be removed by the anaerobic ammonia oxidation reaction, the problem of treatment of the residual sludge in the sewage treatment plant is relieved, and the denitrification efficiency is improved.
Disclosure of Invention
The invention provides a method for realizing reduction treatment and resource utilization of synchronously treating high-concentration nitrate wastewater and excess sludge in an integrated reactor based on a short-range denitrification technology, an anaerobic ammonia oxidation technology and a sludge hydrolysis acid production reduction technology.
The purpose of the invention is realized by the following technical scheme:
1. the device for treating high-concentration nitrate wastewater and synchronously reducing sludge by using the integrated pulse feeding type PDAMOX technology is characterized by comprising a high-concentration nitrate wastewater tank (1), a sludge homogenizing tank (2), an integrated PDAMOX reactor (3) and a sedimentation tank (4); the integrated PDAMOX reactor is provided with a water inlet, a sludge feeding port, a water outlet, a sampling port, a sludge discharge port, a vent pipe, a stirrer, a liquid level meter and a gas collecting device; the sludge homogenizing tank is provided with a sludge inlet pipe, a sludge discharge pipe, a vent pipe, a gas discharge port and a stirrer; the sedimentation tank is provided with a vent pipe and an overflow port.
The water inlet of the integrated PDAMOX reactor is connected with the high-concentration nitrate wastewater tank through a first peristaltic pump; the sludge feeding port is connected with a sludge discharge pipe of the sludge homogenization tank through a residual sludge pump; the water outlet of the integrated PDAMOX reactor is connected with the sedimentation tank.
2. The method for treating high-concentration nitrate wastewater and synchronously reducing sludge by using the integrated pulse feeding type PDAMOX technology is characterized by comprising the following steps of:
inoculating short-range denitrification sludge with incomplete nitrate reduction characteristics and an immobilized anaerobic ammonia oxidation biological membrane, and controlling the sludge concentration in the integrated PDAMOX reactor to be 5.0-8.0 g/L;
starting a stirrer of the sludge homogenization tank and an excess sludge feeding pump, wherein the concentration of the excess sludge is 6.0-10.0 g/L, and when the total volume of the mixed liquid is 60-70% of the effective volume of the reactor, closing the stirrer of the sludge homogenization tank and the excess sludge feeding pump, and stopping feeding the excess sludge;
starting anoxic stirring for 1.0-2.0 h, hydrolyzing the residual sludge to generate short-chain fatty acid serving as an organic carbon source required by denitrification, and releasing ammonia nitrogen;
starting a water inlet pump, pumping high-concentration nitrate wastewater into a reactor, wherein the concentration of nitrate is 0.5-1.0 g N/L, when the volume of a mixed solution is 80-90% of the effective volume of the reactor, closing the water inlet pump, continuing anoxic stirring for 3.0-5.0 h, hydrolyzing residual sludge by denitrifying bacteria to generate an organic carbon source to convert nitrate into nitrite, and simultaneously hydrolyzing sludge by using nitrite by using anammox bacteria to remove ammonia nitrogen;
starting the stirrer of the sludge homogenizing tank and the residual sludge feeding pump again, wherein the concentration of the residual sludge is 5.0-10.0 g/L, and when the total volume of the mixed liquor reaches 100% of the effective volume of the reactor, closing the residual sludge feeding pump;
starting anoxic stirring for 1.5-3.0 h, so that acid production by hydrolysis of the residual sludge and nitrite production by denitrification are synchronously performed, the residual nitrate is reduced, and ammonia nitrogen released in the acid production process by hydrolysis of the residual sludge is removed through anaerobic ammonia oxidation;
standing and precipitating for 1-2 h after stirring is finished, and discharging supernatant with the drainage ratio of 50-60%.
The sludge concentration of the immobilized anaerobic ammonia oxidation biomembrane inoculated by the integrated PDAMOX reactor is not less than 0.3g/L, and the ammonia nitrogen removal rate of the anaerobic ammonia oxidation reaction of the biomembrane is not less than 0.5 kgN/(m)3·d)。
The conversion rate of converting nitrate into nitrite in the denitrification process of the short-range denitrification sludge inoculated by the integrated PDAMOX reactor is not lower than 70%.
The device and the method for treating high-concentration nitrate wastewater by the integrated pulse feeding type PDAMOX process and synchronously reducing sludge provided by the invention have the following advantages:
1. short-chain fatty acids generated by sludge hydrolysis provide an electron donor for short-range denitrification, the dosage of an organic carbon source in the nitrate wastewater treatment process is reduced, the sludge yield is reduced, and stable substrate nitrite is provided for the anaerobic ammonia oxidation process.
2. By adopting pulse type feeding, the inhibition effect of high nitrite accumulation generated in the reduction process of high-concentration nitrate on microorganisms can be reduced, and the denitrification efficiency is improved.
3. The anaerobic ammonia oxidation process can remove ammonia nitrogen released in the sewage hydrolysis acid production process, and the total nitrogen removal efficiency of the system is improved.
4. The internal carbon source in the excess sludge is fully utilized for short-cut denitrification, so that the sludge can be reduced and treated, the resource utilization is realized, and the sewage treatment plant is reduced
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention.
1-high concentration nitrate wastewater tank, 2-sludge homogenization tank, 3-integrated PDAMOX reactor, 4-water outlet tank; 1.1-peristaltic pump, 2.1-mud inlet pipe, 2.2-mud discharge pipe, 2.3-blow-down pipe, 2.4-gas discharge port, 2.5-first stirrer, 2.6-excess mud feeding pump; 3.1-water inlet, 3.2-sludge feeding port, 3.3-sampling port, 3.4-water outlet, 3.5-sludge outlet, 3.6-vent pipe, 3.7-second stirrer, 3.8-liquid level meter, 4.1-vent pipe, 4.2-overflow port.
Detailed Description
The invention is further explained by combining the attached drawings and the embodiment, and as shown in the figure, the device for treating high-concentration nitrate wastewater and synchronously reducing sludge by the integrated pulse feeding type PDAMOX technology comprises a high-concentration nitrate wastewater tank, a sludge homogenizing tank, an integrated PDAMOX reactor and a sedimentation tank; the integrated PDAMOX reactor is provided with a water inlet, a sludge feeding port, a water outlet, a sampling port, a sludge discharge port, a vent pipe, a stirrer, a liquid level meter and a gas collecting device; the sludge homogenizing tank is provided with a sludge inlet pipe, a sludge discharge pipe, a vent pipe, a gas discharge port and a stirrer; the sedimentation tank is provided with a vent pipe and an overflow port.
The water inlet of the integrated PDAMOX reactor is connected with the high-concentration nitrate wastewater tank through a first peristaltic pump; the sludge feeding port is connected with a sludge discharge pipe of the sludge homogenization tank through a residual sludge pump; the water outlet of the integrated PDAMOX reactor is connected with the sedimentation tank.
The method is characterized by comprising the following steps:
inoculating short-range denitrification sludge with incomplete nitrate reduction characteristics and an immobilized anaerobic ammonia oxidation biological membrane, and controlling the sludge concentration in the integrated PDAMOX reactor to be 6.0-8.0 g/L;
starting a stirrer of the sludge homogenizing tank and an excess sludge feeding pump, wherein the concentration of excess sludge is 8.0-12.0 g/L, and when the total volume of the mixed liquid is 60-70% of the effective volume of the reactor, closing the stirrer of the sludge homogenizing tank and the excess sludge feeding pump, and stopping feeding excess sludge;
starting anoxic stirring for 1.5-2.0 h, hydrolyzing the residual sludge to generate short-chain fatty acid serving as an organic carbon source required by denitrification, and releasing ammonia nitrogen;
starting a water inlet pump, pumping high-concentration nitrate wastewater into a reactor, wherein the concentration of nitrate is 0.5-0.8 g N/L, when the volume of a mixed solution is 80-90% of the effective volume of the reactor, closing the water inlet pump, continuing anoxic stirring for 3.0-4.0 h, hydrolyzing residual sludge by denitrifying bacteria to generate an organic carbon source to convert nitrate into nitrite, and simultaneously hydrolyzing sludge by using nitrite by using anammox bacteria to remove ammonia nitrogen;
starting the stirrer of the sludge homogenizing tank and the residual sludge feeding pump again, wherein the concentration of the residual sludge is 5.0-10.0 g/L, and when the total volume of the mixed liquor reaches 100% of the effective volume of the reactor, closing the residual sludge feeding pump;
starting anoxic stirring for 1.5-2.5 h, so that acid production by hydrolysis of the residual sludge and nitrite production by denitrification are performed synchronously, the residual nitrate is reduced, and ammonia nitrogen released in the acid production process by hydrolysis of the residual sludge is removed through anaerobic ammonia oxidation;
and standing and precipitating for 1-2 hours after stirring is finished, and discharging supernatant with the water discharge ratio of 50-60%.
The immobilized anaerobic ammonia inoculated by the integrated PDAMOX reactorThe sludge concentration of the oxidized biomembrane is not less than 0.4g/L, and the ammonia nitrogen removal rate of the anaerobic ammoxidation reaction of the biomembrane is not less than 0.5 kgN/(m)3·d)。
The conversion rate of converting nitrate into nitrite in the denitrification process of the short-range denitrification sludge inoculated by the integrated PDAMOX reactor is not lower than 80%.
The specific test water is nitrate simulation wastewater, the nitrate nitrogen concentration is 600mg/L, the conversion rate of converting nitrate into nitrite in the long-term operation of the inoculated short-range denitrification sludge is 80%, and the ammonia nitrogen removal rate of the inoculated anaerobic ammonia oxidation sludge is 0.8 kgN/(m)3D) the sludge concentration in the reactor after inoculation is 0.75 g/L. The specific operation process is as follows:
starting a stirrer of a sludge homogenizing tank and a residual sludge feeding pump, closing the stirrer of the sludge homogenizing tank and the residual sludge feeding pump when the concentration of the residual sludge is 10.0g/L and the total volume of the mixed liquid is 60% of the effective volume of the reactor, and stopping feeding the residual sludge;
starting anoxic stirring for 1.5h, hydrolyzing the residual sludge to generate short-chain fatty acid serving as an organic carbon source required by denitrification, and releasing ammonia nitrogen;
starting a water inlet pump, pumping high-concentration nitrate wastewater into a reactor, wherein the concentration of nitrate is 600mg N/L, when the volume of mixed liquor is 90% of the effective volume of the reactor, closing the water inlet pump, continuing anoxic stirring for 3.5h, hydrolyzing residual sludge by denitrifying bacteria to generate an organic carbon source to convert nitrate into nitrite, and simultaneously removing ammonia nitrogen generated by sludge hydrolysis by anaerobic ammonium oxidation bacteria by using nitrite;
starting the stirrer of the sludge homogenizing tank and the residual sludge feeding pump again, wherein the concentration of the residual sludge is 10.0g/L, and when the total volume of the mixed liquor reaches 100% of the effective volume of the reactor, closing the residual sludge feeding pump;
starting anoxic stirring for 2.0h, so that acid production by hydrolysis of the residual sludge and nitrite production by denitrification are synchronously performed, the residual nitrate is reduced, and ammonia nitrogen released in the acid production process by hydrolysis of the residual sludge is removed through anaerobic ammonia oxidation;
standing for 1.0h after stirring, and discharging supernatant with a water discharge ratio of 50%.
During the stable process operation period, the final effluent total nitrogen concentration of the integrated PDAMOX system is less than 25mgN/L, wherein the nitrate removal rate is more than 90%, and the effluent ammonia nitrogen is less than 5mg/L, so that the high-efficiency denitrification of the nitrate wastewater is realized; and simultaneously achieves the purpose of resource utilization of the excess sludge.
Claims (1)
1. A pulse feeding type integrated PDAMOX technology for treating high-concentration nitrate wastewater and synchronously reducing sludge is adopted, and a device used in the method comprises a high-concentration nitrate wastewater tank (1), a sludge homogenizing tank (2), an integrated PDAMOX reactor (3) and a water outlet tank (4); the integrated PDAMOX reactor is provided with a water inlet (3.1), a sludge feeding port (3.2), a sampling port (3.3), a water outlet (3.4), a sludge discharge port (3.5), a second emptying pipe (3.6), a second stirrer (3.7) and a liquid level meter (3.8); the sludge homogenizing tank is provided with a sludge inlet pipe (2.1), a sludge discharge pipe (2.2), a first emptying pipe (2.3), a gas discharge port (2.4), a first stirrer (2.5) and a residual sludge feeding pump (2.6); the water outlet tank is provided with a third vent pipe (4.1) and an overflow port (4.2);
the water inlet of the integrated PDAMOX reactor is connected with a high-concentration nitrate wastewater tank through a peristaltic pump (1.1); the sludge feeding port is connected with a sludge discharge pipe of the sludge homogenization tank through a residual sludge pump;
the method is characterized by comprising the following steps:
inoculating short-range denitrification sludge with incomplete nitrate reduction characteristics and an immobilized anaerobic ammonia oxidation biological membrane, and controlling the sludge concentration in the integrated PDAMOX reactor to be 5.0-7.0 g/L, wherein the suspended sludge concentration is 3.0-4.0 g/L;
starting a stirrer of the sludge homogenizing tank and a residual sludge feeding pump, wherein the concentration of the residual sludge is 6.0-15.0 g/L, and when the total volume of the mixed liquid is 60-70% of the effective volume of the reactor, closing the stirrer of the sludge homogenizing tank and the residual sludge feeding pump, and stopping feeding the residual sludge;
starting anoxic stirring for 1.0-2.0 h, hydrolyzing the residual sludge to generate short-chain fatty acid serving as an organic carbon source required by denitrification, and releasing ammonia nitrogen;
starting a peristaltic pump, pumping high-concentration nitrate wastewater into a reactor, wherein the concentration of nitrate is 500-1000 mg/L, when the volume of mixed liquor is 80-90% of the effective volume of the reactor, closing the peristaltic pump, continuing anoxic stirring for 3.0-5.0 h, hydrolyzing the nitrate by using excess sludge by using denitrifying bacteria to generate an organic carbon source to convert the nitrate into nitrite, and simultaneously removing ammonia nitrogen generated by sludge hydrolysis by using nitrite by using anaerobic ammonium oxidizing bacteria;
starting the stirrer of the sludge homogenizing tank and the residual sludge feeding pump again, wherein the concentration of the residual sludge is 6.0-15.0 g/L, and when the total volume of the mixed liquor reaches 100% of the effective volume of the reactor, closing the residual sludge feeding pump;
starting anoxic stirring for 1.5-3.0 h, so that acid production by hydrolysis of the residual sludge and nitrite production by denitrification are synchronously performed, the residual nitrate is reduced, and ammonia nitrogen released in the acid production process by hydrolysis of the residual sludge is removed through anaerobic ammonia oxidation;
standing and precipitating for 1-2 hours after stirring is finished, and discharging supernatant with the water discharge ratio of 50-60%; starting the stirring device again, simultaneously starting the sludge discharge pump to discharge mixed sludge, controlling the concentration of the sludge after water discharge to be 5.0-7.0 g/L, wherein the concentration of suspended sludge is 3.0-4.0 g/L, and closing the stirring device;
the sludge concentration of the immobilized anaerobic ammonia oxidation biomembrane inoculated by the integrated PDAMOX reactor is not less than 0.3 g/L.
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| CN103058374A (en) * | 2013-01-05 | 2013-04-24 | 北京工业大学 | Method for treating high-content ammonia and nitrogen for shortcut nitrification to discharge effluent by coupling simultaneous denitrification of sludge fermentation with autotrophic nitrogen removal |
| CN104276656A (en) * | 2014-10-12 | 2015-01-14 | 北京工业大学 | Method for treating high-concentration nitrate waste water and municipal sewage through denitrification anaerobic ammonium oxidation SBR |
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| CN103058374A (en) * | 2013-01-05 | 2013-04-24 | 北京工业大学 | Method for treating high-content ammonia and nitrogen for shortcut nitrification to discharge effluent by coupling simultaneous denitrification of sludge fermentation with autotrophic nitrogen removal |
| CN104276656A (en) * | 2014-10-12 | 2015-01-14 | 北京工业大学 | Method for treating high-concentration nitrate waste water and municipal sewage through denitrification anaerobic ammonium oxidation SBR |
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