TWI735342B - Method for rapid precipitation of organic wastewater - Google Patents

Abstract

The invention relates to a method for rapid precipitation of organic waste water, including: collecting an organic wastewater; adding a potassium hydroxide solution to the organic wastewater, wherein the ratio of water to potassium hydroxide of said potassium hydroxide solution is between 50:1 and 10:1, and the ratio of the organic wastewater to the potassium hydroxide solution is between 10:1 and 10:3 so that the pH value of the organic wastewater is adjusted to above 10; adding a starch solution to the organic wastewater, wherein the ratio of water to the starch of said starch solution is between 1:0.025 and 1:0.050, and the ratio of the organic wastewater to the starch solution is between 8:1 and 20:1 so that the pH value of the organic wastewater is adjusted to below 8; letting the organic wastewater sit for 10 to 60 minutes for precipitation so that the organic wastewater is rapidly precipitated to form organic solids, a concentrated liquid, and a clear liquid.

Description

Method for rapid precipitation of organic wastewater

The present invention relates to a treatment method that can quickly precipitate organic wastewater and has the best filtering effect.

At present, organic waste water formed by general livestock manure or kitchen waste is mainly treated by three-stage wastewater treatment equipment. The treatment sequence is: solid-liquid separation, anaerobic fermentation and aerobic treatment, and the treated wastewater is Release. Therefore, in the above-mentioned processing equipment and processing method, the waiting time for precipitation processing is long, and the electricity cost of the processing is high, which will emit foul smells and pollute the environment and ecology.

Therefore, there is a patent case of Invention No. CN109665663 "A Method for Treating Wastewater from Livestock and Poultry Farming" published in Mainland China on April 23, 2019, which discloses: including the pretreatment stage, the biochemical treatment stage and the advanced treatment stage. The pretreatment stage at least includes the preliminary grid removal, inclined screen separation, and coagulation sedimentation of the wastewater; the biochemical treatment stage includes at least the wastewater anaerobic fermentation, anaerobic sedimentation, and AB biological nitrogen and phosphorus removal; the depth The treatment stage at least includes photocatalytic oxidation of wastewater, biological denitrification, and production of agricultural fertilizers from the waste liquid treated by this technical solution, which provides high-quality fertilizer resources for agriculture, and at the same time realizes the extraction and reuse of biogas in the wastewater treatment process , After the wastewater is treated, it is better than the aquaculture wastewater discharge standard, realizing the discharge of the aquaculture wastewater or the reuse of the reclaimed water, which is both energy-saving and environmentally friendly.

There is also a patent case of Invention No. 201209014 "A system and method for preparing methane from animal waste, organic substrate fertilizer and usable water" published on March 1, 101 of the Republic of China, which discloses: including separation of the animal waste Steps into liquid waste and solid waste. Anaerobic digestion of the waste Function to produce methane and a wet by-product. The wet by-product is pressed into a filter cake, which is granulated into the organic matrix fertilizer. The liquid waste is clarified to produce a supernatant and a sludge, which together with the wet by-products are pressed into a filter cake. Ammonia is extracted from the supernatant to produce ammonium sulfate and an aqueous solution. The aqueous solution is filtered to produce a concentrate and water filtrate. The water filtrate can be used as drinking or washing water. The ammonium sulfate and concentrate can be used to provide the solid waste, which is granulated into the organic matrix fertilizer. In an alternative embodiment, a portion of the supernatant and aqueous solution can be used as liquid fertilizer.

However, the processing equipment of the previous patents mentioned above has a complex structure, a long processing time and a cumbersome and time-consuming processing method, and the processing cost is too high. At the same time, there is still a certain degree of pollution to the environment and ecology, so the use is not ideal.

In view of this, in view of the current known organic wastewater treatment methods have the above-mentioned shortcomings. Therefore, the present invention provides a method for rapid precipitation of organic waste water, which includes: collecting an organic waste water; adding a potassium hydroxide solution to the organic waste water, and the mixing ratio of water and potassium hydroxide in the potassium hydroxide solution is 50: 1~10:1, the addition ratio of the organic wastewater to the potassium hydroxide solution is 10:1~10:3, so that the pH value is adjusted to above 10; a starch solution is added to the organic wastewater, and the starch The mixing ratio of water and starch in the solution is 1:0.025~1:0.050, and the addition ratio of the organic wastewater to the starch solution is 8:1~20:1, so that the pH value is adjusted to below 8; An adsorbent is added to the organic waste water, and the ratio of the organic waste water to the adsorbent is 1:0.025~1:0.1, so as to deodorize and deodorize the organic waste water; the organic waste water is allowed to stand for precipitation 10 ~60 minutes, the organic waste water is rapidly precipitated to form an organic solid, a concentrated liquid and a clear liquid.

The above potassium hydroxide uses plant ash, and 20 kg of the plant ash is dissolved in 1 ton of water to form the potassium hydroxide solution.

Add 150 L of this potassium hydroxide solution to 1 ton of the above-mentioned organic waste water.

After adding the potassium hydroxide solution to the above-mentioned organic wastewater, it is mixed for another 30 minutes.

The above starch solution uses sweet potato powder, which is 33 kg of sweet potato powder dissolved in 1 ton of water.

Add 100 L of this starch solution to 1 ton of the above-mentioned organic wastewater.

After adding the starch solution to the above-mentioned organic wastewater, it is mixed for another 30 minutes.

The above-mentioned organic solid is exported to make a solid fertilizer, the concentrated liquid is exported to make a liquid fertilizer, and the clarified liquid is exported for use as a water supply.

The above-mentioned clarified liquid discharge standards include: pH value is 6~9, floating solid SS is 86~125mg/L, biochemical oxygen demand is 47~62mg/L, chemical oxygen demand is 325~410mg/L, The electrical conductivity is 2.42~3.25ms/cm and the appearance color is transparent, colorless and clear.

The addition ratio of the organic wastewater to the adsorbent is 1:0.03.

The above-mentioned adsorbent is an activated carbon or a sand algae, and 33 kg of the adsorbent is added to 1 ton of the organic waste water.

The mixing ratio of water and potassium hydroxide in the potassium hydroxide solution is 20:1, the addition ratio of the organic waste water to the potassium hydroxide solution is 20:3, and the mixing ratio of water and starch in the starch solution is 20:1. It is 1:0.033, and the addition ratio of the organic wastewater to the starch solution is 10:1.

The above technical features have the following advantages:

1. The system can make organic waste water quickly precipitate in a short time, so as to separate organic solids, concentrated liquids and clear liquids, which can greatly shorten the processing time and improve the efficiency of separation.

2. The separated organic solid is rich in potassium, which can be used as a solid fertilizer, which is beneficial to the growth of plants.

3. The separated concentrated liquid can be used as liquid fertilizer for fertilizing plants.

4. The separated clarified liquid can be used as water supply for irrigation or cleaning.

5. The manufacturing cost is low, so the price can be relatively reduced to achieve the purpose of mass popularization.

6. By adding adsorbents such as activated carbon or sand algae earth, it can deodorize and deodorize organic wastewater to avoid air pollution.

1: Sewage storage tank

11: output

12: The first switch

2: Fast sedimentation tank

21: Solid discharge end

22: The second switch

23: Concentrate output

24: third switch

25: Clarified liquid output

26: Fourth switch

27: Blender

3: Concentrate aeration tank

31: Concentrate circulating end

32: The first power pump

33: Concentrate discharge end

34: Fifth switch

35: Concentrate aerator

4: Clarified liquid aeration tank

41: Clarified liquid circulation end

42: Second power pump

43: Clarified liquid discharge end

44: The sixth switch

45: Clarified liquid aerator

5: Concentrate collection tank

A: Organic wastewater

A1: Organic solid

A2: Concentrate

A3: Clarified liquid

[The first figure] is a schematic diagram of the structure of a rapid precipitation device for organic wastewater according to an embodiment of the present invention.

[The second figure] is a schematic diagram of organic solids, concentrated liquids and clear liquids formed in the rapid precipitation tank of the embodiment of the present invention.

[Third Figure] is a flow chart of a method for rapid precipitation of organic wastewater according to an embodiment of the present invention.

[Fourth Figure] is a sedimentation photograph of a sedimentation experiment with pig feces and urine in an embodiment of the present invention.

[Fifth Figure] is a photo of the precipitation experiment with pig feces and urine in the embodiment of the present invention, respectively, before suction filtration (a) and filter paper (b) filtration.

[The sixth figure] is a photo of the precipitation experiment with pig feces and urine in the embodiment of the present invention, respectively, after suction filtration (a) and filter paper (b) filtration.

Please refer to the first and second figures, the embodiment of the present invention is a rapid precipitation device for organic wastewater, which includes: sewage storage tank 1, rapid precipitation tank 2, concentrated liquid aeration tank 3, clarified liquid aeration Tank 4 and concentrate collection tank 5, of which:

Sewage storage tank 1 is used to collect an organic waste water A formed by livestock manure or kitchen waste. The sewage storage tank 1 is provided with an output end 11, and a first switch 12 that is opened manually or electrically is provided on the output end 11 for outputting the organic wastewater A.

The rapid sedimentation tank 2 is located at the outlet of the output end 11 for receiving the outputted organic wastewater A. The rapid precipitation tank 2 can make the organic waste water A form an organic solid A1, a concentrated liquid A2, and a clarified liquid A3 from bottom to top after precipitation. The bottom of the rapid sedimentation tank 2 is provided with a solid discharge end 21 corresponding to the organic solid A1, and the solid discharge end 21 is provided with a manual or electric method. A second switch 22 is turned on to discharge the organic solid A1, so that it can be made into solid fertilizer. The fast sedimentation tank 2 is provided with a concentrated liquid output terminal 23 at a position corresponding to the concentrated liquid A2, and a third switch 24 is provided on the concentrated liquid output terminal 23, which can be turned on manually or electrically, so as to output the concentrated liquid A2. The quick sedimentation tank 2 is provided with a clear liquid output terminal 25 at the position corresponding to the clear liquid A3, and the clear liquid output terminal 25 is provided with a fourth switch 26 that can be turned on manually or electrically to output the clear liquid. A3. In addition, a mixer 27 is provided in the rapid precipitation tank 2.

The concentrated liquid aeration tank 3 is located at the outlet of the concentrated liquid output end 23 for receiving the output concentrated liquid A2. The concentrated liquid aeration tank 3 is provided with a concentrated liquid circulating end 31, the outlet of the concentrated liquid circulating end 31 is located above the rapid precipitation tank 2, and the concentrated liquid circulating end 31 is provided with a first power pump 32 for transporting the concentrated liquid A2 that has not been discharged back to the rapid precipitation tank 2. In addition, the concentrated liquid aeration tank 3 is provided with a concentrated liquid discharge end 33, and the concentrated liquid discharge end 33 is provided with a fifth switch 34 that can be opened manually or electrically for the concentrated liquid A2 that can be discharged. Be discharged. In addition, the concentrated liquid aeration tank 3 is provided with a concentrated liquid aerator 35 to increase the aeration volume.

The clarified liquid aeration tank 4 is located at the outlet of the clarified liquid output end 25 for receiving the clarified liquid A3. The clarified liquid aeration tank 4 is provided with a clarified liquid circulation end 41. The outlet of the clarified liquid circulation end 41 is located above the rapid sedimentation tank 2. A second power pump 42 is provided on the clarified liquid circulation end 41. , So as to transport the undischarged clarified liquid A3 back to the rapid sedimentation tank 2. In addition, the clarified liquid aeration tank 4 is provided with a clarified liquid discharge end 43, and the clarified liquid discharge end 42 is provided with a sixth switch 44 that can be manually or electrically opened for discharging the clarified liquid A3. Be discharged. In addition, the clarified liquid aeration tank 4 is provided with a clarified liquid aerator 45 to increase the aeration volume.

The concentrated liquid collection tank 5 is located at the outlet of the concentrated liquid discharge end 33 for receiving the discharged concentrated liquid A2, which can be used to make solid fertilizer.

The embodiment of the present invention is a method for rapid precipitation of organic waste water, which is implemented together with the above-mentioned rapid precipitation device for organic waste water. As shown in the first and third diagrams, the method for rapid precipitation of organic wastewater includes the following steps.

A. Collect an organic waste water. Collect an organic waste water A in the sewage storage tank 1.

B. Add a potassium hydroxide solution to the organic wastewater. By turning on the first switch 12, the organic wastewater A in the sewage storage tank 1 is transported to the rapid precipitation tank 2 through the output terminal 11. Then add a potassium hydroxide (KOH) solution to the organic wastewater A. The mixing ratio of water and potassium hydroxide in the potassium hydroxide solution is 50:1~10:1, but 20:1 is the best . The potassium hydroxide in the embodiment of the present invention uses plant ash, and 20 kg of plant ash is dissolved in 1 ton of water. The addition ratio of the organic wastewater A to the potassium hydroxide solution is 10:1-10:3, but 20:3 is the best. In the embodiment of the present invention, 150L of the potassium hydroxide solution is added to 1 ton of the organic wastewater A, and after being quickly mixed by the mixer 27 for 30 minutes, the pH value is adjusted to above 10 to accelerate the precipitation rate.

C. Add a starch solution to the organic wastewater. The mixing ratio of water to starch in the starch solution is 1:0.025~1:0.050, but 1:0.033 is the best. The starch solution in the embodiment of the present invention uses sweet potato powder, which is 33 kg of sweet potato powder dissolved in 1 ton of water. The addition ratio of the organic wastewater A to the starch solution is 8:1-20:1, but 10:1 is the best. In the embodiment of the present invention, 100L of the starch solution is added to 1 ton of the organic wastewater A, and after 30 minutes of slow mixing through the mixer 27, the pH value is adjusted to below 8 so that it can meet the emission standards The pH value is 6-9.

D. Add an adsorbent to the organic wastewater. The adsorbent is an activated carbon or sand algae, and the addition ratio of the organic wastewater A to the adsorbent is 1:0.025 to 1:0.1, but 1:0.03 is the best. In the embodiment of the present invention, 33 kg of the adsorbent is added to 1 ton of the organic wastewater A, so that the organic wastewater A has a deodorizing and deodorizing effect.

E. The organic waste water is allowed to settle for 10 to 60 minutes so that the organic waste water is rapidly precipitated to form an organic solid, a concentrated liquid and a clear liquid. As shown in the second figure, let the organic wastewater A stand still After 10-60 minutes of precipitation, the organic waste water A is rapidly precipitated from bottom to top in the rapid precipitation tank 2 to form the organic solid A1, the concentrated liquid A2, and the clarified liquid A3, respectively.

F. Export the organic solid to make a solid fertilizer. The organic solid A1 is discharged through the solid discharge end 21 by turning on the second switch 22 to prepare the solid fertilizer. In addition, the solid fertilizer is rich in potassium, which can be beneficial to the growth of plants.

G. Export the concentrated liquid to make a liquid fertilizer. The concentrated liquid A2 is output to the concentrated liquid aeration tank 3 through the concentrated liquid output terminal 23 by turning on the third switch 24. During the output process, the concentrated liquid A2 is filtered through a first filter material, which is an activated carbon filter paper or an activated carbon filter. The concentrated liquid aeration tank 3 activates the concentrated liquid aerator 35 to increase the aeration volume. The pH value of the concentrated liquid A2 is 6-9, the conductivity (representing salinity and organic matter) is 2.83-4.05ms/cm, and the color is ocher to brown. If the concentrated liquid A2 has not been discharged, the first power pump 32 is activated, and the concentrated liquid A2 is transported back to the rapid precipitation tank 2 through the concentrated liquid circulating end 31 to settle again. If the concentrated liquid A2 can be discharged, by turning on the fifth switch 34, the concentrated liquid is discharged to the concentrated liquid collecting tank 5 through the concentrated liquid discharge end 33, so that it can be made into liquid fertilizer. Moreover, the liquid fertilizer is rich in potassium, which can be beneficial to the growth of plants.

H. Export the clarified liquid for use as water supply. The clarified liquid A3 is output to the clarified liquid aeration tank 4 through the clarified liquid output terminal 25 by turning on the fourth switch 26. During the output process, the clarified liquid A3 is filtered through a second filter material. The second filter material is an activated carbon filter paper or an activated carbon filter screen. The clarified liquid aeration tank 4 activates the clarified liquid aerator 45 to increase the amount of aeration. In addition, the clarified liquid A3 was tested and analyzed through a clarified liquid discharge standard. The clarified liquid discharge standard included: pH value of 6~9, floating solid SS of 86~125mg/L, and biochemical oxygen demand (BOD) of 47~62mg/L, chemical oxygen demand (COD) is 325~410mg/L, conductivity is 2.42~3.25ms/cm and appearance color is transparent, colorless and clear. If the clarified liquid A3 does not meet the clarified liquid discharge standard, the second power pump 42 is activated, and the clarified liquid A3 is transported back to the rapid sedimentation tank 2 through the clarified liquid circulation end 41 to settle again. If the clarified liquid A3 reaches the clarified liquid discharge standard, by turning on the sixth switch 44, the clarified liquid is discharged through the clarified liquid discharge end 43 and used as water supply for irrigation or cleaning.

The present invention uses a pig feces to carry out a precipitation experiment, and the experimental results are shown in Table 1 below.

From the above experimental results, it can be known that the present invention has fast sedimentation speed and excellent filtering effect, so it can improve the complex structure of the conventional processing equipment, the processing method is troublesome and time-consuming, and the processing cost is too high. At the same time, it also has a certain degree of environmental ecology. Disadvantages such as pollution.

The cost of the embodiment of the present invention is quite low, and the cost of its purchase is shown in Table 2 below.

Based on the description of the above embodiments, when one can fully understand the operation and use of the present invention and the effects of the present invention, but the above embodiments are only the preferred embodiments of the present invention, and the implementation of the present invention cannot be limited by this. The scope, that is, simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the description of the invention, are all within the scope of the present invention.

Claims (12)

A method for rapid precipitation of organic waste water, comprising: collecting an organic waste water; adding a potassium hydroxide solution to the organic waste water, and the mixing ratio of water and potassium hydroxide in the potassium hydroxide solution is 50:1~10: 1. The addition ratio of the organic wastewater to the potassium hydroxide solution is 10:1~10:3, so that the pH value is adjusted to above 10; a starch solution is added to the organic wastewater, and the water in the starch solution is The mixing ratio of starch is 1:0.025~1:0.050, and the addition ratio of the organic wastewater to the starch solution is 8:1-20:1, so that the pH value is adjusted to below 8; add in the organic wastewater An adsorbent, the addition ratio of the organic waste water to the adsorbent is 1:0.025~1:0.1, so as to deodorize and deodorize the organic waste water; the organic waste water is allowed to stand and settle for 10-60 minutes, The organic waste water is rapidly precipitated to form an organic solid, a concentrated liquid and a clear liquid. For example, the method for rapid precipitation of organic wastewater in claim 1, wherein the potassium hydroxide uses plant ash, and 20 kg of the plant ash is dissolved in 1 ton of water to form the potassium hydroxide solution. For example, the organic waste water rapid precipitation method of claim 1, wherein 150 L of the potassium hydroxide solution is added to 1 ton of the organic waste water. For example, the method for rapid precipitation of organic wastewater in claim 1, wherein the organic wastewater is mixed with the potassium hydroxide solution for another 30 minutes. For example, the method for rapid precipitation of organic waste water in claim 1, wherein the starch solution uses sweet potato powder, which contains 33 kg of sweet potato powder dissolved in 1 ton of water. For example, the method for rapid precipitation of organic wastewater in claim 1, wherein 100 L of the starch solution is added to 1 ton of the organic wastewater. For example, the method for rapid precipitation of organic wastewater in claim 1, wherein the organic wastewater is mixed with the starch solution for another 30 minutes. For example, the method for rapid precipitation of organic wastewater in claim 1, wherein the organic solid is exported to make a solid fertilizer, the concentrated liquid is exported to make a liquid fertilizer, and the clarified liquid is exported for use as a water supply. For example, the method for rapid precipitation of organic wastewater in claim 8, wherein the clarified liquid discharge standard includes: pH value is 6-9, floating solid SS is 86-125mg/L, and biochemical oxygen demand is 47-62mg/L , The chemical oxygen demand is 325~410mg/L, the conductivity is 2.42~3.25ms/cm and the appearance color is transparent, colorless and clear. For example, the organic waste water rapid precipitation method of claim 1, wherein the addition ratio of the organic waste water to the adsorbent is 1:0.03. For example, the method for rapid precipitation of organic waste water according to claim 1, wherein the adsorbent is an activated carbon or an algae earth, and 33 kg of the adsorbent is added to 1 ton of the organic waste water. For example, the method for rapid precipitation of organic waste water in claim 1, wherein the mixing ratio of water and potassium hydroxide in the potassium hydroxide solution is 20:1, and the addition ratio of the organic waste water to the potassium hydroxide solution is 20: 3. The mixing ratio of water and starch in the starch solution is 1:0.033, and the addition ratio of the organic wastewater to the starch solution is 10:1.

Images