TWI492785B - Method for hydrolysis of biosolids - Google Patents

Description

Organic solid matter hydrolysis method

This proposal relates to a hydrolysis process, in particular to a process for the hydrolysis of organic solids.

In general, the current treatment of organic solids is mostly through the treatment of organic solids by aerobic or anaerobic organisms, thereby achieving the effect of reducing solids, but this process requires a long time to pass through the biological digestion process. Time, therefore, in order to effectively shorten the time required for biological digestion, most of them are chemically or physically pretreated, and the organic solids are decomposed or cracked, and the macromolecules are converted into small molecules to enhance oxygen or anaerobic. The rate of digestion of the organism and effectively shortens the digestion time of the overall organic solids.

A conventional and common chemical pretreatment is a chemical method using alkali hydrolysis treatment. First, the organic solid matter is introduced into a treatment tank, and after precipitation, alkali is added for hydrolysis, and then re-drying and recycling, although this will increase the overall The time for the treatment of organic solids, but the addition of chemicals, in addition to the increase in salt in the original organic solids, may also cause secondary damage to the environment such as chemical pollution, therefore, the use of such chemical pretreatment Care must be taken to limit the application. In addition, chemical pretreatment is not able to perform organic fertilization, reducing the value of organic solids treatment.

However, in general, the physical pretreatment methods are mostly lysed by increasing the external force. The most common method is to firstly mix the organic solids and then pass the super The sound wave is hydrolyzed, and the organic matter in the organic solid is cleaved by the energy of the ultrasonic wave in the water, so that the oxygen- or anaerobic organism can be more easily digested, and the digestion time of the whole organic solid is reduced.

In short, the physical pretreatment of ultrasonic cracking can avoid the secondary environmental pollution that may be caused by chemical pretreatment, but the ultrasonic wave needs to be driven by an external power supply, especially in the face of a large amount of organic solids. It is bound to consume a lot of electricity. Therefore, how to achieve the efficiency of higher hydrolysis of organic solids by using a method or means to reduce the time of using ultrasonic waves while maintaining the same ultrasonic cracking efficiency, or using the same time of ultrasonic waves, has long been It has always been the goal of the relevant manufacturers.

This proposal provides a method for using nano-water to increase the efficiency of ultrasonic hydrolysis.

The organic solid matter hydrolysis method according to the present proposal includes the steps of: mixing an organic solid with nano water to form an organic liquid, wherein the nano water has a plurality of nano bubbles, and the nano bubbles have therein Oxygen; and the application of ultrasonic waves to organic liquids, so that the nanobubbles produce additional cavitation effects (compared to the cavitation effects that are also produced in organic liquids).

In summary, when the nano-water with nano-bubbles is mixed with the organic solid, the ultrasonic wave is applied to the organic liquid, and in addition to the cavitation effect generated in the original organic liquid, the nano-bubble is also generated. The additional cavitation effect collapses to form more blasting phenomena, so that the surrounding organic solids are subjected to more blasting impact to produce better cracking effect, thus accelerating the decomposition of organic solids, and secondly, The volume characteristics of the rice bubble, the nano bubble will be even It is dispersed in the organic liquid and does not float upward due to its own buoyancy. Therefore, the position where the organic liquid is uniformly inflated and the blasting due to the cavitation effect is average.

The features, implementation and efficacy of this proposal are described in detail below with reference to the drawings.

20,22‧‧‧Liquid organic matter concentration before ultrasonic treatment

21,23‧‧‧Dissolved organic matter concentration after ultrasonic treatment

31‧‧Non water generator

311‧‧‧ water inlet

32‧‧‧Reaction tank

321,363‧‧‧ organic solids entrance

322‧‧‧Water outlet

323‧‧‧ Guide tube

33‧‧‧ Ultrasonic generator

34,34A‧‧‧ catheter

35‧‧‧ Anaerobic treatment tank

36‧‧‧Mixed tank

361‧‧‧ entrance

362‧‧‧Export

Figure 1A is a flow chart of the proposed method for hydrolyzing organic solids.

Fig. 1B is a schematic view showing the implementation of the organic solid hydrolysis method of the present proposal.

Figure 2 is a schematic diagram showing the difference between the treatment of adding organic water and the treatment of organic sludge without added water.

Fig. 3 is a schematic view showing an embodiment of the organic solid matter hydrolysis pretreatment apparatus of the present proposal.

Fig. 4 is a schematic view showing another embodiment of the organic solid matter hydrolysis pretreatment apparatus of the present proposal.

Please refer to "1A" and "1B", "1A" is a flow chart of the proposed organic solids hydrolysis method, and "1B" is a schematic diagram of the implementation of the proposed organic solids hydrolysis method. The organic solid matter hydrolysis method can be applied to the treatment of organic waste, and the organic solids are cracked and then subjected to digestion by oxygen or anaerobic organisms, which can increase the efficiency of organic sludge treatment and reduce the waiting time for the organism to carry out the digestion reaction. .

The organic solids hydrolysis method comprises the following steps: Step 10: mixing an organic solid with one nanometer of water to form an organic liquid, wherein the organic solids include sludge, waste or flowers and trees, etc., and the nano water has a plurality of Nano bubbles, which have an oxygen gas in the nanobubbles, in this embodiment and some other embodiments, The methane bubble also has methane, hydrogen or a mixed gas of methane and hydrogen; and step 11: applying ultrasonic waves to the organic liquid, causing the inner bubble of the nanobubble to generate an additional cavitation effect, and the cavitation effect produces a range. Very small, but high temperature and high pressure impact, it is worth noting that due to the volume characteristics of the nanobubbles, the nanobubbles are evenly dispersed in the organic liquid without floating up due to their own buoyancy, and the organic liquid is uniformly inflated and The location of the blast due to the cavitation effect is average. Furthermore, the nanobubbles described in step 10 are filled with oxygen and methane, hydrogen or a mixed gas of methane and hydrogen, so that when the air bubbles are generated by the nanobubbles, the cavitation effect may generate 5000 ° C or more. High temperature, so the combustion phenomenon will occur at the same time, which will increase the impact force of the blasting to improve the efficiency of hydrolysis of organic solids. In one embodiment, the organic liquid in step 10 has a volume percentage of nano water and organic solids ranging from 0.05:1 to 1:1, and the nanometer bubbles contained in the nano water have a particle size of 10 nanometers. From meters to 999 nm, organic solids can be, but are not limited to, fibrous materials, agricultural waste, sludge or food waste.

In an embodiment, the output power range of the ultrasonic wave described in step 11 may be, but not limited to, 300 to 1200 watts, and the frequency may be between 20 kilohertz (kHz) and 100 kHz, however, the art is known. People, the vibration frequency of the sound wave exceeds 20 kHz, which is the range of ultrasonic waves, and the power of the ultrasonic wave is inversely proportional to the frequency, that is, in the same ultrasonic generator, the power generated by the 20 kHz frequency is the largest, therefore, in this specification. The disclosed ultrasonic frequency range is illustrative and is not intended to limit any of the technical features of the present proposal.

Please refer to the "Fig. 2", "2nd picture" is a schematic diagram of the experimental results of ultrasonic treatment of organic sludge with nano water and organic sludge without added nano water. In the schematic diagram, the value of the vertical axis represents the concentration of dissolved organic matter in an organic liquid in mg/L, and the concentration of dissolved organic matter usually represents organic matter in a liquid. The density of the distribution. When the ultrasonic wave is subjected to a hydrolysis process in an organic liquid, the impact force generated by the cavitation effect destroys the outer layer of the organic sludge (for example, the cell wall), causing the organic matter in the organic sludge to flow out, and the concentration of the dissolved organic matter in the organic liquid is increased. In simple terms, the higher the concentration of dissolved organic matter, the easier the digestion of oxygen- or anaerobic organisms can increase the digestion rate of the overall organic sludge and shorten the digestion time of the organic sludge.

In this experiment, the inventors used 150 ml of organic sludge to mix 150 ml of pure water with nano water having nanobubbles, and the suspended solids (SS) concentration in the organic sludge was 8185 mg/ L, the concentration of volatile solids (VSS) is 5895 mg / L, and then ultrasonic treatment at a frequency of 20 kHz and 700 watts for 15 minutes, the experiment results are illustrated in Figure 2, the left group in the figure For the experimental data without adding nano water, including the concentration of dissolved organic matter 20 before ultrasonic treatment and the concentration of dissolved organic matter after ultrasonic treatment 21, the concentration of dissolved organic matter 20 before ultrasonic treatment is 128 mg / L, and the dissolved organic matter concentration 21 after ultrasonic treatment is 3379 mg/L. The right group is the experimental data with the addition of nano water, including the concentration of dissolved organic matter 22 before ultrasonic treatment and the concentration of dissolved organic matter after ultrasonic treatment 23, and the concentration of dissolved organic matter before ultrasonic treatment is 22 At 165 mg/L, the concentration of dissolved organic matter after ultrasonic treatment is 23,485 mg/L. Therefore, using the nanobubbles to carry out the organic sludge hydrolysis phase, as shown in Fig. 2, in the same environment. The hydrolysis of organic sludge without the addition of nanobubbles can increase the efficiency by 140%.

Please refer to "Fig. 3" and "Fig. 4", and "Fig. 3" is a schematic diagram of an embodiment of the organic solid matter hydrolysis pretreatment apparatus of the present proposal, and "Fig. 4" is the present invention before the hydrolysis of the organic solid matter. A schematic diagram of another embodiment of the treatment apparatus, the organic solids hydrolysis pretreatment apparatus of the present invention is applied to an organic solid matter treatment system having an anaerobic treatment tank 35, anaerobic treatment The tank 35 has anaerobic organisms to produce methane, hydrogen or a mixed gas of methane and hydrogen, and the pretreatment apparatus includes a nano water generator 31, a reaction tank 32, and an ultrasonic generator 33.

The nano water generator 31 is formed by mixing methane, hydrogen or a mixed gas of methane and hydrogen generated by the anaerobic treatment tank 35 into a plurality of nano bubbles, and mixing the nano bubbles with water to form one nanometer of water, wherein The particle size of nano bubbles ranges from 10 nm to 999 nm. The reaction tank 32 houses an organic liquid mixed with nano-organic solids, wherein the volume percentage of the nano water and the organic solids ranges from 0.05:1 to 1:1. The ultrasonic generator 33 supplies the reaction tank 32 with ultrasonic energy having a maximum output power of 700 watts and a frequency of 20 kHz to 100 kHz, so that the nanobubbles in the organic liquid generate cavitation effects, thereby cracking the organic solids. The organic solids are then passed to an anaerobic treatment tank 35 to increase the amount of subsequent anaerobic digestion of biogas to increase the efficiency of the renewable energy.

As shown in the embodiment of FIG. 3, the organic solids pre-treatment apparatus of this embodiment further includes a conduit 34 connected between the anaerobic treatment tank 35 and the nano water generator 31 for A part of methane, hydrogen or a mixed gas of methane and hydrogen generated by the anaerobic treatment tank 35 is introduced into the nano water generator 31, and one end of the nano water generator 31 has a water inlet 311 which flows into the water to form a mixture. The other end of the water has a water outlet 322. The reaction tank 32 has an organic solid inlet 321 and a guiding tube 323. The organic solid inlet 321 is filled with an organic solid from the outside to the reaction tank 32. The water outlet 322 of the nano water generator 31 flows into the reaction tank 32, and is mixed in the reaction tank 32 to form the organic liquid. The organic liquid is subjected to ultrasonic energy by the ultrasonic generator 33 to generate cavitation effect, and then The organic liquid is sent to the anaerobic treatment tank 35 through the guide tube 323.

As shown in the "Fig. 4", the organic solid of this example is hydrolyzed before The processing device further includes a conduit 34A and a mixing tank 36. The conduit 34A is connected to the anaerobic treatment tank 35 and the nano water generator 31 for partially methane, hydrogen or methane and hydrogen generated by the anaerobic treatment tank 35. The mixed gas is introduced into the nano water generator 31, and one end of the nano water generator 31 has a water inlet 311 which flows into water to be mixed to form nano water. The mixing tank 36 has an organic solid inlet 363 and an inlet. 361 and an outlet 362, the organic solids are externally filled from the organic solids inlet 363 to the mixing tank 36, and the inlet 361 is connected to the nano water generator 31, and the nano water passes through the nano water generator 31. One of the water outlets 322 flows in from the inlet 361 of the mixing tank 36 and is mixed with the organic solids in the mixing tank 36 to form an organic liquid, and the outlet 362 is coupled to the reaction tank 32 to transport the organic liquid to the reaction tank 32, the organic liquid. After the ultrasonic energy is applied to the ultrasonic generator by the ultrasonic generator 33 to generate a cavitation effect, the organic liquid is transported to the anaerobic treatment tank 35 via the guide tube 323.

It is worth noting that the methane, hydrogen or a mixture system of methane and hydrogen described in the present proposal corresponds to methane, hydrogen or a mixture of methane and hydrogen produced by digestion of anaerobic organisms in the anaerobic treatment tank 35. Methane, hydrogen or a mixed gas of methane and hydrogen is defined as biogas.

In summary, the organic solids hydrolysis method provided by this proposal utilizes nanobubbles to increase the probability of cavitation.

Although the embodiments of the present disclosure are as described above, it is not intended to limit the proposal. Anyone who is familiar with the relevant art, regardless of the spirit and scope of the proposal, shall be in the shape, structure, characteristics and spirit as stated in the scope of the application. A number of changes may be made, so the scope of patent protection of this proposal is subject to the definition of the scope of the patent application attached to this specification.

Claims (5)

An organic solid matter hydrolysis method comprises the steps of: mixing an organic solid with one nanometer water to form an organic liquid, wherein the nano water has a plurality of nano bubbles, and the nano bubbles have an oxygen gas therein. And applying an ultrasonic wave to the organic liquid to cause a cavitation effect of the nano bubbles to generate a bursting force to accelerate decomposition of the organic solid. The method for hydrolyzing an organic solid according to claim 1, wherein the volume percentage of the nano water and the organic solid in the organic liquid ranges from 0.05:1 to 1:1. The method for hydrolyzing an organic solid according to claim 1, wherein each of the nanoparticle bubbles has a particle size of from 10 nm to 999 nm. The organic solid matter hydrolysis method according to claim 1, wherein the ultrasonic wave has a frequency of 20 to 100 kilohertz (kHz). The organic solid matter hydrolysis method according to Item 1, wherein the nano bubbles further comprise a methane, a hydrogen gas or a mixed gas of the methane and the hydrogen gas.