TWI586609B - System for Treating Organic Wastewater and Slurry - Google Patents

Description

Organic wastewater and sludge treatment system

The invention relates to the field of organic waste treatment, in particular to treating organic wastewater and sludge by using microorganisms.

With the concept of environmental and ecological conservation rising, manufacturers are paying more and more attention to the treatment of waste liquid. In the treatment of waste liquid, organic waste liquid and inorganic waste liquid are generally classified and processed. For organic waste liquid, it can be concentrated and chelated to form a slurry state. In addition, it is found that microorganisms such as bacteria and fungi can rely on organic matter in organic waste liquid as a carbon source, and organic nutrient-type microorganisms will grow and multiply through The proliferation, fermentation, photosynthesis, etc. of microorganisms such as bacteria and fungi can decompose organic matter to form so-called biological sludge, which is also called activated sludge.

Under the microscope, the biological sludge contains inorganic substances, microorganisms, protozoa and metazoans, etc., forming a micro-ecological system of microbial flora, also known as rubber feather. Gum feathers are more easily supplemented by micro-organisms in the biological world, such as algae, plankton, etc., and can be used as composting, in which the water is separated and purified by purified water. According to this, the impact on the environment or ecology can be reduced.

Microorganisms have high load on organic wastewater and can handle high concentrations of organic wastewater, which can reduce water waste caused by dilution. In addition, the equipment is small in scale and less affected by the season, which can reduce the cost of installation and operation. In addition, the treated biological sludge can be utilized as a compost, and the environmental benefits are achieved.

However, the biological sludge produced every day still needs to have enough space for stacking, which is still a small burden for storage costs. At present, the commonly used method is to remove the biological sludge and reduce the volume of the sludge after dewatering and drying the biological sludge, but the amount of solid biological sludge produced per day is not reduced. In another way, the solid biological sludge is transported to a high-temperature aerobic tank, and the biological sludge is decomposed into small molecules by a combination of heating, ultrasonication, aerobic microorganisms or dosing, and then decomposed by microorganisms, or by Supplementation of metazoan. However, dehydration, drying, or decomposition with a high temperature aerobic tank requires additional power costs. High-temperature aerobic tanks require equipment and pharmaceutical costs, and also require sufficient space in the plant to have a way to set them up.

In order to solve the problem of energy consumption and cost increase of the conventional technology, it is difficult to set a high-temperature aerobic tank in the plant space. An organic wastewater and sludge treatment system is provided herein. The organic wastewater and sludge treatment system comprises an anaerobic tank, an aerobic tank, and a mud water separation tank. The anaerobic tank receives an organic wastewater and a photosynthetic liquid, which is produced by an industrial factory, a food factory, a domestic wastewater, or a landfill. The photosynthetic bacteria system is added to the anaerobic tank daily from 1/800 to 1/200 of the volume of the oxygen bath, and the photosynthetic broth is at a high concentration of 10 ⁸ to 10 ¹¹ colony forming units (CFU/mL) per ml. The bacterial liquid and the photosynthetic bacterial liquid treat the organic wastewater into a first biological sludge and output it. Here, the organic wastewater is used as a carbon source for photosynthesis bacteria to cause photosynthetic bacteria to proliferate. The residual solid organic matter decomposed by the photosynthetic bacteria forms a first biological sludge with by-products of photosynthetic bacteria metabolism.

The aerobic tank is connected to the anaerobic tank to receive the first biological sludge, and receives a spore liquid, and the spore liquid is added to the aerobic tank daily from 1/800 to 1/200 of the volume of the aerobic tank, and The concentration in the spore liquid is 10 ⁸ to 10 ¹¹ CFU/mL, and the spore liquid treats the first biological sludge treated sludge as a second biological sludge and outputs it, where the spore liquid can continue to decompose. The solid organic matter remaining in the first biological sludge can also decompose the attached product produced by the metabolism of the photosynthetic bacteria, and can effectively reduce the solid matter in the first biological sludge, and simultaneously the molecular group of the first biological sludge. Decomposes into smaller molecular groups. The by-product after the metabolism of the spores and the undecomposed solid matter remaining in the first biological sludge form a second biological sludge.

The mud water separation tank communicates with the aerobic tank, receives the second biological sludge, separates the water in the second biological sludge from the suspended solids, and obtains the discharged water and a biological sludge to be discharged. Further, the mud water separation tank is also connected to the oxo tank, and the biological sludge is again transported back to the oxygen tank as a reflux biological sludge and mixed with the newly input organic wastewater. This state is to fully utilize the incompletely metabolized strain of the biological sludge and replenish it back into the system.

In one embodiment, the photosynthetic strain in the photosynthetic bacterial liquid belongs to the Rhodospirillaceae family, and the Rhodospirillaceae is capable of heterotrophic growth under facultative conditions, and in nature, often aggregates and grows in water and The sun can be worn in the mud but the oxygen is thin. It is a facultative or micro-aerobic bacterium. It can remove nitrogen, desulfurization and dephosphorization. It can treat wastewater containing high salinity, oil and some organic compounds that are difficult to biodegrade. The by-product of photosynthesis is mainly starch. The Bacillus amyloliquefaciens in the spore liquid can ferment to produce cellulase, protease, lipase, and lipase in a micro-oxygen environment. Amylase, surfactin, and iturimycin. Bacillus amyloliquefaciens is selected in combination with the main by-products of the genus Rhodospirillaceae, which can effectively decompose starch and simultaneously decompose solid organic matter that cannot be effectively decomposed by the genus Rhodospirillaceae. Further, the photosynthetic strain selects Rhodopseudomonas Sphaeroides of the Rhodospirillaceae family.

In one embodiment, the organic wastewater and sludge treatment system further comprises a pH adjustment tank, and the pH adjustment tank adjusts the pH value of the organic wastewater to a pH between 6 and 10, and then adjusts the pH. The organic wastewater is then sent to the oxygen tank.

In one embodiment, the pH of the mixed solution of the organic wastewater and the photosynthetic bacterial liquid in the oxo tank is between 6 and 10. The pH of the mixed solution of the first biological sludge and the spore liquid in the aerobic tank is between 6 and 10. In general, photosynthetic bacteria liquid and spore liquid can survive under weak acidic to alkaline conditions and undergo photosynthesis or fermentation.

In one embodiment, the temperature of the organic wastewater and the photosynthetic bacteria in the oxo tank is between 16 ° C and 40 ° C, and the temperature of the first biological sludge and the spore liquid in the aerobic tank is between 16 ° C and 40 ° C. In general, photosynthetic bacteria and spore liquids can survive at normal temperatures and undergo photosynthesis or fermentation without special heating or cooling.

In one embodiment, the mud water separation tank may include at least one of a sedimentation tank, a flotation tank, and a Membrane Bioreactor (MBR). Here, it can be arranged according to the site conditions of each factory. In the membrane biological reaction tank, when the mud water is separated, more photosynthetic bacteria and spores can be retained in the biological sludge, and the biological sludge is recirculated and replenished into the oxygen tank. More effective.

In one embodiment, the photosynthetic bacterial liquid is added to the anaerobic tank 2 to 8 times a day, and the spore liquid is added to the aerobic tank 2 to 8 times a day, so as to maintain the oxygenation tank and aerobic tank. The tank is proliferated and reacted at a high concentration to obtain higher efficiency.

In one embodiment, the dissolved oxygen content of the first biological sludge and the spore liquid in the aerobic tank is 1 to 10 ppm, and the oxygen content in the oxygen chamber is not measured.

In summary, the organic wastewater and sludge treatment system is completed by the selection and matching of the strains, and the better sludge decomposition effect is obtained by using the strains in a suitable environment to decompose the solid suspended solids and the rubber feathers. The small molecules are formed, so that the final biological sludge is in the form of a soluble solution, and then separated by means of mud water separation, so that the amount of biological sludge can be reduced from the source without using other energy sources or adding other equipment.

Referring to Figure 1, a schematic diagram of the unit of the organic wastewater and sludge treatment system of the present invention. As shown in FIG. 1, the organic wastewater and sludge treatment system 100 of the present invention comprises a oxygenation tank 11, an aerobic tank 13, and a mud water separation tank 15, which receives an organic wastewater 21 and a photosynthetic liquid 23 The organic wastewater 21 may be pre-stored in a raw liquid tank or directly input from an external pipeline, and the organic wastewater 21 is produced by an industrial factory, a food factory, a domestic wastewater, or a landfill. The photosynthetic bacterial liquid 23 is added to the oxygen-containing tank 13 at a ratio of 1/800 to 1/200 of the volume of the oxygen-containing tank per day, preferably 1/600 to 1/450, and is added to the oxygen-containing tank 13. The concentration of the strain in the photosynthetic bacteria solution 23 is 10 ⁸ to 10 ¹¹ colony forming units per ml (CFU/mL), preferably 10 ⁹ to 10 ¹⁰ CFU/mL. The photosynthetic bacteria liquid 23 treats the organic wastewater 21 into a first biological sludge and outputs it. The aerobic tank 11 has a stirring device, and the photosynthetic bacteria liquid 23 can be sufficiently mixed into the organic wastewater 21 to carry out a reaction.

Here, the photosynthetic bacteria in the photosynthetic bacterial liquid selects the strain of Rhodospirillaceae, especially the strain of Rhodopseudomonas Sphaeroides, and its import classification number (CCC code) is 38249009136. . , Rhodospirillaceae is a facultative or facultative aerobic bacterium, which can be used for heterotrophic growth in water and silt in a place where sunlight can pass through, but oxygen is thin, and can directly use high concentration of organic wastewater (BOD> 10,000 ppm). The photosynthetic reaction is carried out as a carbon source and a hydrogen source, and the by-product after photosynthesis is mainly starch. In addition, Drosophila can also remove nitrogen, desulfurization, dephosphorization, and can handle high salt, oil and so on.

The photosynthetic bacterial liquid 23 can be added in an amount of 2 to 8 times a day, preferably 4 to 6 times, in order to maintain the high concentration of the photosynthetic bacterial liquid 23 in the oxygen-containing tank 11 to maintain the efficiency of the reaction. The photosynthetic bacteria liquid 23 can be pre-stored in a photosynthetic bacteria liquid tank, and is added to the oxygen-containing tank 11 through a pipeline and a pump in a timed manner, but is not limited thereto, and it is not necessary to inject it manually.

The aerobic tank 13 is connected to the anaerobic tank 11 to receive the first biological sludge, and receives a spore liquid 25, and the spore liquid 25 is added daily to 1/800 to 1/200 of the aerobic tank 13 volume to In the aerobic 13 tank, it is preferably from 1/600 to 1/450. The concentration in the spore solution is 10 ⁸ to 10 ¹¹ CFU/mL, preferably 10 ⁹ to 10 ¹⁰ CFU/mL. The spore liquid 25 treats the first biological sludge treated sludge into a second biological sludge and outputs it. Further, in the embodiment of the present invention, the air blower is provided to drive the outside air into the mixture of the spore liquid 25 and the first biological sludge. The spore liquid 25 may be added 2 to 8 times a day, preferably 4 to 6 times a day, in order to maintain a high concentration of the spore liquid 25 in the aerobic tank 13 to maintain the efficiency of the reaction. In addition, the spore liquid 25 can be pre-stored in a spore liquid tank, and added to the aerobic tank 13 through a pipeline and a pump in a timed manner, but is not limited thereto, and even if it is manually poured.

Here, the Bacillus amyloliquefaciens in the spore liquid 25 has a CCC code of 23091000. Bacillus amyloliquefaciens is suitable for action in a micro-oxygen environment, for example, the dissolved oxygen content of the first biological sludge and the spore liquid in the aerobic tank 13 is 1 to 10 ppm, preferably 2 to 5 ppm. Environment. Bacillus amyloliques can ferment to produce cellulase, protease, lipase, amylase, surfactin, and ituricine Wait. The Bacillus amyloliquefaciens is selected in combination with the main by-products of the genus Rhodospirillum, which can effectively decompose the starch and simultaneously decompose the solid organic matter which cannot be effectively decomposed by the genus Rhodospirillaceae, thereby enabling the first biological sludge of small molecular mass to be Decomposed into a second biological sludge that is finer and even soluble in water.

The mud water separation tank 15 communicates with the aerobic tank 13, receives the second biological sludge, separates the water in the second biological sludge from the suspended solids, and discharges the discharged water and a biological sludge. Further, the muddy water separation tank 15 is further connected to the oxo tank 11, and the biological sludge is again transported back to the oxygen tank 11, and is again mixed with the organic wastewater 21 as reflux biological sludge to fully utilize the residual photosynthetic bacteria and spores to continue. Proliferation and response. The type of the muddy water separation tank 15 may include at least one of a sedimentation tank, a flotation tank, and a Membrane Bioreactor (MBR). The above is merely an example, but is not limited thereto, and any apparatus capable of separating biological sludge and discharging water can be used as a muddy water separation tank. The number and type of mud-water separation tanks 15 can be selected according to the budget and space of each factory. The membrane biological reaction tank can retain more photosynthetic bacteria and spores, and is more suitable for the way that biological sludge is transported back to the oxygen-containing tank 11 again. use.

Photosynthetic bacteria can perform functions such as nitrogen removal, desulfurization, dephosphorization, etc., and have a better value-added and reaction rate under appropriate pH values. The pH of the mixture of the organic wastewater 21 and the photosynthetic bacteria 23 in the oxygen chamber 11 is between 6 and 10, preferably between 7 and 9, in addition, the first biological sludge and spore in the aerobic tank 13 The pH of the mixture of bacterial liquid 25 is between 6 and 10, preferably between 7 and 9. As shown in FIG. 1, the organic wastewater and sludge treatment system further includes a pH adjustment tank 17, and the pH adjustment tank 17 is connected to the oxygenation tank 11, and the organic wastewater 21 is adjusted to a pH between 6 and 10 in advance. In particular, between 7 and 9, the pH-adjusted organic wastewater 21 is then sent to the oxygen-containing tank 11 through a pump or pipeline. The pH adjustment tank 17 can preferentially adjust the pH value of the environment to a condition in which the photosynthetic bacteria or the spores are easily reacted, so that the proliferation and the reaction rate are improved.

Further, the temperature of the mixture of the organic wastewater 21 and the photosynthetic bacteria 23 in the oxygen chamber 11 and the mixture of the first biological sludge and the spore liquid 25 in the aerobic tank 13 are at 16 ° C to 40 ° C, It is preferably 22 to 35 °C. That is, under normal temperature, both the photosynthetic liquid 23 and the spore liquid 25 can effectively proliferate and decompose, and the energy consumption can be reduced without additional heating.

The following is the actual chemical oxygen demand (COD) of the detected and discharged water and the sludge formation rate of the mud-water separation tank by the four sets of experiments and the control group through the oxygen tank, the aerobic tank and the mud-water separation tank. Since the comparative example is the organic wastewater directly received, the composition may be different each time, and thus the difference in the rate of production of the biological sludge is compared. In the experimental example 1, the photosynthetic bacterial liquid was added in an amount of 1/500 of the volume of the anaerobic tank, and was divided into six hours per day, the concentration of the photosynthetic liquid was 10 ⁹ CFU/mL, and the spore liquid was 1/500 of the volume of the aerobic tank. And divided into six hours a day, the concentration of the spore liquid was 10 ⁹ CFU / mL. Experimental Example 2 was carried out by halving the dose of the photosynthetic bacterial liquid and the spore liquid of Experimental Example 1. Experimental Example 3 is a method in which the spore liquid is replaced with an effective microorganism (EM) strain, that is, a mixed bacterial liquid mixed with a fungus such as a spore, a yeast, or a lactic acid bacteria, and the spore liquid of the experimental example 1 The dose and concentration are the same. Experimental Example 4 The spore liquid was replaced with the Bacillus subtilis by the experiment example 1, which was the same as the dose and concentration of the spore liquid of Experimental Example 1. Table 1 below shows the average of the results measured by the six-week test. Table 1 <TABLE border="1"borderColor="#000000"width="_0004"><TBODY><tr><td></td><td> Release water COD (mg/L) </td><Td> sludge formation rate (g MLSS/g COD) </td><td> sludge formation rate difference (g MLSS/g COD) </td></tr><tr><td> comparison example 1 </td><td> 55 </td><td> 0.48 </td><td></td></tr><tr><td> Experimental Example 1 </td><td> 56 </ Td><td> 0.29 </td><td> 0.19 </td></tr><tr><td> Comparative example 2 </td><td> 55 </td><td> 0.33 </td ><td></td></tr><tr><td> Experimental Example 2 </td><td> 56 </td><td> 0.23 </td><td> 0.10 </td></tr><tr><td> Comparison example 3 </td><td> 55 </td><td> 0.49 </td><td></td></tr><tr><td> Experiment Example 3 </td><td> 150 </td><td> 0.37 </td><td> 0.12 </td></tr><tr><td> Comparison example 4 </td><td> 55 </td><td> 0.41 </td><td></td></tr><tr><td> Experimental Example 4 </td><td> 150 </td><td> 0.30 </td><td> 0.11 </td></tr></TBODY></TABLE>

In the above experiment, it was also found that the length of the hyphae produced by the EM bacteria and the Bacillus subtilis was long, which easily caused the clogging problem of the muddy water separation tank, and thus it was necessary to additionally invest in artificial fishing or to put drugs into the inhibition or removal. In addition, from the results of the chemical oxygen demand of the discharged water, the EM bacteria and the Bacillus subtilis substantially increase the chemical oxygen demand of the discharged water when the first biological sludge is fermented, and further control is required. Therefore, according to the above experimental results, it is preferable to maintain the chemical oxygen demand of the discharged water while reducing the solid suspended matter in Experimental Example 1.

In the above embodiments, the photosynthetic bacteria and the spore liquid are selected to treat the organic wastewater, and a suitable sludge reduction effect can be obtained in a suitable facultative and aerobic environment, respectively, without affecting the water quality of the discharged water. In addition, the hyphae of photosynthetic bacteria and spore liquids do not excessively grow to cause clogging. It can reduce the amount of biological sludge from the source, reduce the additional energy consumption, drug addition or equipment cost, and can solve the problems faced by the conventional technology and overcome the technical bias.

Although the preferred embodiments of the present invention are disclosed above, it is not intended to limit the present invention, and those skilled in the art can make some modifications and refinements without departing from the scope of the present invention. The scope of patent protection shall be subject to the definition of the scope of the patent application attached to this specification.

11‧‧‧Oxygen tank
13‧‧‧aerobic tank
15‧‧‧Mine water separation tank
17‧‧‧pH adjustment tank
21‧‧‧Organic wastewater
23‧‧‧Photosynthetic liquid
25‧‧‧ spore liquid
100‧‧‧Organic Wastewater and Sludge Treatment System

Fig. 1 is a schematic view showing the unit of the organic wastewater and sludge treatment system of the present invention.

11‧‧‧Oxygen tank

13‧‧‧aerobic tank

15‧‧‧Mine water separation tank

17‧‧‧pH adjustment tank

21‧‧‧Organic wastewater

23‧‧‧Photosynthetic liquid

25‧‧‧ spore liquid

100‧‧‧Organic Wastewater and Sludge Treatment System

Claims (10)

An organic wastewater and sludge treatment system comprising: an anaerobic tank, receiving an organic wastewater and a photosynthetic broth, the photosynthetic broth being added to the daily volume of 1/800 to 1/200 of the volume of the oxygen chamber In the oxygenation tank, the concentration in the photosynthetic bacterial liquid is 10 ⁸ to 10 ¹¹ CFU/mL, and the photosynthetic bacterial liquid is treated as a first biological sludge and then output; an aerobic tank is connected Receiving the first biological sludge and receiving a spore liquid, the spore liquid is added to the aerobic tank daily at 1/800 to 1/200 of the volume of the aerobic tank. And the concentration in the spore liquid is 10 ⁸ to 10 ¹¹ CFU/mL, the spore liquid is the first biological sludge treated sludge as a second biological sludge and is output; and a mud water separation tank And communicating with the aerobic tank, receiving the second biological sludge, separating the water in the second biological sludge from the suspended solids, and obtaining the discharged water and a biological sludge to be discharged. The organic wastewater and sludge treatment system according to claim 1, wherein the photosynthetic bacteria in the photosynthetic bacterial liquid belongs to Rhodospirillaceae, and the Bacillus amyloliquefaciens in the spore liquid is Bacillus amyloliquefaciens. . The organic wastewater and sludge treatment system according to claim 2, wherein the photosynthetic strain belongs to Rhodopseudomonas Sphaeroides. The organic wastewater and sludge treatment system according to claim 2, further comprising a pH adjustment tank, wherein the pH adjustment tank is connected to the oxo tank, and the organic wastewater is adjusted to a pH between 6 and 10. Thereafter, the organic wastewater is sent to the oxygenation tank. The organic wastewater and sludge treatment system according to claim 2, wherein the pH of the mixture of the organic wastewater and the photosynthetic bacterial solution in the oxo tank is between 6 and 10, and the first in the aerobic tank A mixture of a biological sludge and the spore solution has a pH between 6 and 10. The organic wastewater and sludge treatment system according to claim 2, wherein the temperature of the mixture of the organic wastewater and the photosynthetic bacterial liquid in the anaerobic tank is between 16 ° C and 40 ° C, and the first in the aerobic tank The temperature of a mixture of biological sludge and the spore liquid is between 16 ° C and 40 ° C. The organic wastewater and sludge treatment system of claim 1, wherein the slurry separation tank comprises at least one of a precipitation tank, a flotation tank, and a Membrane Bioreactor (MBR). The organic wastewater and sludge treatment system according to claim 1, wherein the photosynthetic bacteria liquid is added to the anaerobic tank 2 to 8 times a day, and the spore liquid system is added to the good one to two times a day. In the oxygen tank. The organic wastewater and sludge treatment system according to claim 1, wherein the dissolved oxygen amount of the first biological sludge and the spore liquid in the aerobic tank is 1 to 10 ppm. The organic wastewater and sludge treatment system according to claim 1, wherein the slurry separation tank is further connected to the anaerobic tank, and the biological sludge is again transported back to the anaerobic tank and the organic wastewater and the photosynthetic liquid. mixing.