CN112479756B

CN112479756B - Method for treating black-odor oxygen-free sludge by using microorganisms

Info

Publication number: CN112479756B
Application number: CN202010983976.0A
Authority: CN
Inventors: 徐大伟
Original assignee: Beijing Zhonglian Blue Technology Co Ltd
Current assignee: Beijing Zhonglian Blue Technology Co Ltd
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2021-10-22
Anticipated expiration: 2040-09-17
Also published as: CN112479756A

Abstract

The invention discloses a method for treating anaerobic black and odorous sludge by using microorganisms, which comprises the following steps: s1, crushing rice chaff and straws into powder, and uniformly mixing and stirring to obtain a raw material mixture; s2, soaking the raw material mixture in a low-temperature domesticated microorganism aqueous solution; and S3, stirring and mixing the soaked raw material mixture and the sludge to be purified, adding a catalytic enzyme biological composting agent, fully mixing, exposing the mixture to the air, and standing to purify the sludge to obtain purified soil. The invention utilizes microorganism to rapidly decompose pollutants in the organic matter river channel (sludge), rapidly reduces the content of ammonia, nitrogen, phosphorus, potassium and other organic matters in the sludge through decomposition, absorption and transfer, volatilizes the organic matters in a gaseous state, forms soil components with the content of inorganic matters as the main component, thereby achieving the best treatment effect, not generating secondary pollution, achieving the aim of treating both symptoms and root causes, directly catalyzes and decomposes on site, avoids long-distance transportation, and has the advantages of safety, high efficiency, low cost, investment saving, simple operation and the like.

Description

Method for treating black-odor oxygen-free sludge by using microorganisms

Technical Field

The invention belongs to the technical field of ecological treatment of water areas, and particularly relates to a method for treating black and odorous anaerobic sludge by using microorganisms.

Background

With the rapid development of social economy and the acceleration of urbanization process, the water environment evolution is greatly interfered by human activities, and the contradiction between the normal maintenance of the water ecosystem and the human activities is very prominent. For years, because of huge water consumption of industry and agriculture in China, the continuous accumulated effect of water pollution discharge on water is obvious, a large number of projects such as bending, straightening, paving and hardening, cutting off and taking water are carried out on river channels and lakes and reservoirs for flood prevention, sewage interception, water resource utilization and the like, and the self-purification and self-repair capacity of the water body is far from bearing the pollution load of warehousing.

Landscape water bodies such as rivers and the like are important components in urban living environment, but due to the characteristics of easy pollution, small water environment capacity, poor water body self-purification capacity and the like, the landscape water bodies can easily become acceptors of domestic sewage, rainwater and garbage of residents, so that a large amount of dissolved oxygen of the water bodies is consumed, the water bodies are in a black and odorous state due to oxygen deficiency, and the whole ecological system is in a crisis. The urban rivers have black and odorous, which is a common phenomenon of urban river networks in China and seriously affects the life of residents, the urban image and the ecological environment.

Specifically, the black odor of the urban river is mainly the result of imbalance of water body oxygen supply and oxygen consumption caused by excessive sewage receiving, pollutants are converted under the anoxic and anaerobic conditions of the water body, and odorous substances such as ammonia nitrogen, hydrogen sulfide, volatile organic acid and the like and black substances such as iron and manganese sulfide and the like are generated. Domestic sewage is the most common and major source of pollution causing black and odorous urban watercourses. The water treatment method has the advantages that domestic garbage, tail water of organic industrial wastewater and sewage plants, excrement and sewage of livestock and poultry farms and the like are also included, so that black and odorous urban river channels are eliminated, the water environment quality is improved, and the water treatment method has extremely important practical significance for guaranteeing the urban human health and promoting social harmony and economic sustainable development. The sludge in the river channel, the ditch, the pool, the garbage station and the drainage ditch is analyzed, the pollution source is a large amount of organic matters generated under the anoxic or anaerobic condition, and the organic matters are fermented to generate harmful gases and organic pollutants to form black and odorous sludge. The existing water quality purification function is single, harmful substances are easily caused to remain in water after water quality is purified, water bottom sludge is difficult to purify, and harmful microorganisms in water are propagated in large quantities without really playing a role in purifying water quality. The existing treatment methods are generally physical methods, chemical methods and biological methods, but the physical methods have high investment cost and slow effect, the chemical methods have the problems of high use cost and easy secondary pollution of water bodies, the biological methods are widely applied to river black and odorous treatment and mainly comprise artificial wetland treatment, aquatic plant recovery, biological remediation and the like, but the biological methods have the problem of slow treatment speed.

Disclosure of Invention

The invention aims to provide a method for treating black, odorous and oxygen-free sludge by utilizing microorganisms.

In order to accomplish the above objects, according to one aspect of the present invention, there is provided a method for treating oxygen-free black and odorous sludge using microorganisms, comprising: s1, crushing rice chaff and straws into powder, and uniformly mixing and stirring to obtain a raw material mixture; s2, soaking the raw material mixture in a low-temperature domesticated microorganism aqueous solution; and S3, stirring and mixing the soaked raw material mixture and the sludge to be purified, adding a catalytic enzyme biological composting agent, fully mixing, exposing the mixture to the air, and standing to purify the sludge to obtain purified soil.

According to the invention, step S2 includes: and (3) carrying out 5 times of soaking and airing cycles on the raw material mixture, wherein the soaking time is 10 minutes each time, and airing the raw material mixture in a shade place at 10-30 ℃ after each time of soaking.

According to the invention, the mixing ratio of the raw material mixture when the raw material mixture is soaked in the low-temperature domesticated microorganism aqueous solution is 1: 50-1: 80.

According to the invention, step S3 includes: and mixing the soaked raw material mixture with sludge to be purified, adding a catalytic enzyme biological composting agent, fully mixing, exposing to the air, standing for 10-15 days, and turning over once in the fifth day and the tenth day to obtain the purified soil.

According to the invention, the soaked raw material mixture and the sludge to be purified are uniformly mixed and stirred according to the mass ratio of 1: 80-1: 120, preferably 1: 100.

According to the invention, the catalytic enzyme biological composting agent is a mixture of medical stone and water, wherein the medical stone mineral particles are soaked in the second microorganism water agent; the second microorganism water agent is prepared by a second microorganism raw bacteria liquid (the preservation number of a microorganism strain is ACCC20060, the genus name of Candida, the species name of Utilis, the Chinese name of Candida utilis) and water according to the volume ratio of 1: 50.

According to the invention, the addition amount of the catalytic enzyme biological compost agent accounts for 0.1-0.5% of the sludge to be purified.

According to the invention, the low-temperature domesticated microorganism aqueous solution is prepared by a low-temperature domesticated microorganism raw bacterium solution and water according to the volume ratio of 1:50, and microbial strains adopted in the low-temperature domesticated microorganism aqueous solution are ACCC21356, Williapsis californica and California pseudo-wilfordii yeast.

According to the invention, the grain size of the rice chaff is 2-5 mm, and the grain size of the straw is 3-6 mm; the mass ratio of the rice chaff to the straw mixture is 1: 1-3: 2.

According to the invention, the medical stone mineral particles are irregularly shaped, the largest dimension of which does not exceed 10 cm, preferably 3-5 cm.

The invention has the beneficial effects that:

1) the invention mainly utilizes the microbial decomposition catalysis technology to treat the anaerobic black and odorous sludge, namely utilizes catalytic enzyme microorganisms to quickly decompose pollutants in organic matter riverways (sludge), quickly reduces the content of organic matters such as ammonia, nitrogen, phosphorus, potassium and the like in the sludge through decomposition, absorption and transfer, volatilizes the organic matters in a gaseous state, and forms soil components with the main content of inorganic matters, thereby achieving the best treatment effect, not generating secondary pollution, achieving the aim of treating symptoms and root causes, and having the characteristics of safety, high efficiency, low cost, investment conservation, simple operation and the like.

2) The existing sludge treatment is generally directly abandoned or made into organic fertilizer, the invention can directly convert and decompose organic matters into inorganic matters through microbial catalysis, has no odor and peculiar smell, can directly catalyze and decompose on site, and avoids long-distance transportation.

3) The invention adopts the microorganism method to decompose the sludge, the mineralized microorganism is mixed in the sludge, the stability of the soil state is stably kept, the mineralized microorganism can not be recovered to the sludge state under the action of oxygen deficiency, the mineralized microorganism can be repeatedly used, new organic matter pollution is not generated, and the invention can be used for soil greening and backfilling. In the aspect of economy and energy conservation, the existing solid microorganisms take 1 cubic sludge as an example, the investment is 200-350 yuan (including transportation), and the new technology catalyzes 1 cubic investment budget price of 100 yuan (including transportation), so that the cost is greatly saved.

4) The cubic content of the low-temperature domesticated microorganism adopted by the invention is 1.5 ten thousand times higher than the original normal-temperature microorganism content, the low-temperature domesticated microorganism is not restricted by seasonal climate conditions and is not influenced by temperature environment, the existing solid microorganism and original bacterial liquid can only work at normal temperature, and the microorganism of the invention can still work normally at low temperature of 0-10 ℃.

Drawings

FIG. 1 is a diagram showing the relationship between the temperature of the heap and the water content when the anaerobic black and odorous sludge is treated by the microbial agent.

FIG. 2 is a photograph of sludge before being treated by the oxygen-free black and odorous sludge treatment method of the present invention.

FIG. 3 is a photograph of sludge treated by the oxygen-free black and odorous sludge treatment method of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be emphasized that the specific embodiments described herein are merely illustrative of the invention, are some, not all, and therefore do not limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

In order to solve the problem of blackening and smelling of sludge, the invention provides a method for treating oxygen-free black and smelly sludge by using microorganisms, which comprises the following steps: s1, crushing rice chaff and straws into powder, and uniformly mixing and stirring to obtain a raw material mixture; s2, soaking the raw material mixture in a low-temperature domesticated microorganism aqueous solution; and S3, stirring and mixing the soaked raw material mixture and the sludge to be purified, adding catalytic enzyme mineral material powder, fully mixing, exposing in air, standing to purify the sludge, and obtaining the purified soil. The grain size of the adopted rice chaff is 2-5 mm, the grain size of the straw is 3-6 mm, and the mixing mass ratio of the rice chaff and the straw is 1: 1-3: 2. Besides being mixed, the rice chaff and the straw can be used independently.

The invention mainly utilizes microbial catalytic enzyme to rapidly decompose organic matters in sludge, and microbial strains in the adopted low-temperature domesticated microbial water agent are ACCC21356, Williapisis californica and Vibrio parahaemolyticus. The low-temperature domesticated microorganism aqueous solution is prepared by mixing low-temperature domesticated microorganism raw bacterium solution and water according to the volume ratio of 1: 50. Wherein the mass ratio of the raw material mixture to the low-temperature domesticated microorganism water agent is 1: 50-1: 80. The soaked raw material mixture and the sludge to be purified are mixed according to the mass ratio of 1: 80-1: 120, preferably 1:100, and are uniformly mixed and stirred.

According to the invention, step S2 can be carried out by subjecting the raw material mixture to 5 cycles of soaking and airing, wherein the soaking time is 10 minutes each time, and the raw material mixture is placed in a shade place for airing at 10-30 ℃.

The catalytic enzyme biological composting agent is a mixture of medical stone mineral material powder and water, wherein the medical stone mineral material powder is obtained by soaking medical stone mineral particles into a second microorganism water agent (the mass ratio of medical stone in the mixture is 5-9%). Soaking Maifanitum in the second microorganism water solution to form solid biological coating film outside Maifanitum mineral particles. Preferably, the medical stone mineral particles are subjected to 5 times of soaking and airing cycles, the soaking time is 10 minutes each time, and the medical stone mineral particles are placed in a shade place for airing at 10-30 ℃ after being soaked each time, so that the microbial original bacteria liquid is solidified on the mineral medical stone, the size of the microbial original bacteria liquid is not obviously changed generally, and only a solid biological coating film is formed outside the carrier. The second microorganism water agent is prepared by mixing microorganism raw bacteria liquid (the preservation number of a microorganism strain is ACCC20060, the genus name of Candida, the species name of Utilis, the Chinese name of Candida utilis) and water according to the volume ratio of 1: 50.

Preferably, the addition amount of the catalytic enzyme biological compost agent accounts for 0.1-0.5% of the sludge to be purified.

The medical stone mineral particles adopted by the invention are irregular in shape, and the maximum size of the medical stone mineral particles is not more than 10 cm, preferably 3-5 cm.

In the invention, the low-temperature domesticated microorganisms act on the rice chaff straw powder, namely, the rice chaff and the straw powder are mixed, then soaked by the low-temperature domesticated microorganism aqueous solution, and then mixed with the sludge to be purified. The method is characterized in that the rice husk and straw are soaked after the low-temperature domesticated microorganism raw bacteria liquid is diluted by water, organic matters capable of releasing taste and anaerobic organic matters caused by ammonia nitrogen are restricted, the rice husk and straw powder is mainly used for removing sludge odor, and the porosity and the temperature in sludge are increased under the action of the rice husk and straw after the low-temperature domesticated microorganism cement is soaked, so that moisture is better volatilized, and the odor in the sludge black mud is more quickly emitted. Adding the catalytic enzyme bio-compost agent into sludge to be purified, rapidly decomposing organic matters in the sludge, removing peculiar smell and odor caused by oxygen deficiency and ammonia nitrogen exceeding standard, degrading into odorless, and decomposing the organic matters to change the sludge into loess color and return to the home position.

The technical scheme of the invention is further explained by combining specific examples.

Example 1

The practical application of sludge to soil conversion is completely realized in dredging of the sewage ditch comprehensive treatment engineering of the Korean camp and water-tight slope village in the cisternal region, 2230 cubic meters of sludge are dug, and 1672 cubic meters of soil are converted after microbial treatment. Fig. 2 and fig. 3 are photographs of sludge before and after treatment by the oxygen-free black and odorous sludge treatment method of the present invention, respectively.

1) Weighing 6Kg of rice bran powder and 4Kg of straw powder according to the standard weight of the sludge of 1000Kg, mixing and stirring, and then soaking in 300-800Kg of low-temperature domesticated microorganism aqueous solution.

2) Uniformly stirring and mixing the soaked raw material mixture and sludge to be purified according to the mass ratio of 1:100, then adding 5kg of catalytic enzyme biological composting agent, fully mixing, exposing to the air, standing for 15 days, wherein turning over once on the fifth day and the tenth day to purify the sludge and obtain purified soil. The catalytic enzyme biological composting agent is a mixture of medical stone and water obtained by soaking medical stone mineral particles (the maximum size is not more than 10 cm, generally 3-5 cm) into a second microorganism water agent, wherein the second microorganism water agent is prepared by a second microorganism raw bacteria liquid (the preservation number of a microorganism strain is ACCC20060, the name of Candida, the name of Utilis, and the name of Chinese: Candida utilis) and water according to the volume ratio of 1: 50.

The influence of the microorganisms of the present invention on the amount of ammonia produced is discussed below:

before the third stage of the test in the first stage, by determining environmental ammonia monitoring points and carrying out fixed-point and timing monitoring, the ammonia monitoring points are 115.38ppm on average 5 days before sludge is untreated, after the test is started, the ammonia values of the monitoring points are gradually reduced, and by the time of feeding on the 7 th day, the average ammonia content of each point is 30.75ppm (average value of each point position on 6 days in the later stage of the test), the ammonia content is reduced by 73%.

In the tests from the first period to the third period, compared with a sludge tank pile without the microbial agent, the odor of the sludge with the microbial agent is obviously reduced after 3 days, the pile body emits fermentation odor after high temperature, and the environment of the pile area can not smell odor by sense after the test of 14 days in the third period.

FIG. 1 is a water content decrement table showing the influence of the microbial inoculum of the invention on the temperature and the water content of a stack, and it can be seen that after the microbial inoculum is used, the interior is rapidly heated, the decomposition speed and the rapid volatilization of organic matters are increased, the water (the water content is effectively reduced) in sludge forms evolution soil, the generation of the organic matters is inhibited in virtuous circle, and the conditions of soil evolution such as sludge shrinkage and void enlargement for eliminating anaerobism can be provided from the physical angle.

The foregoing is only a preferred application of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the technical principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.

Claims

1. A method for treating oxygen-free black and odorous sludge by using microorganisms is characterized by comprising the following steps:

s1, crushing rice chaff and straws into powder, and uniformly mixing and stirring to obtain a raw material mixture;

s2, soaking the raw material mixture in a low-temperature domesticated microorganism aqueous solution;

s3, stirring and mixing the soaked raw material mixture and sludge to be purified, adding a catalytic enzyme biological composting agent, fully mixing, exposing the mixture to air, and standing to purify the sludge to obtain purified soil;

the low-temperature domesticated microorganism aqueous solution is prepared by a low-temperature domesticated microorganism raw bacterium solution and water according to the volume ratio of 1:50, and microorganism strains adopted in the low-temperature domesticated microorganism aqueous solution are ACCC21356, Williapisis californica and California pseudo-Williams yeast;

the catalytic enzyme biological composting agent is a mixture of medical stone and water, wherein the medical stone mineral particles are soaked in a second microorganism water agent; the second microbial water agent is prepared from a second microbial stock solution (the preservation number of a microbial strain is ACCC20060, the genus name of Candida, the species name of Utilis, the Chinese name of Candida utilis) and water according to the volume ratio of 1: 50.

2. The method according to claim 1, wherein the step S2 includes: and (3) carrying out 5 times of soaking and airing cycles on the raw material mixture, wherein the soaking time is 10 minutes each time, and the raw material mixture is placed in a shade place for airing at 10-30 ℃ after being soaked each time.

3. The method according to claim 1 or 2, wherein the raw material mixture is soaked in the aqueous low-temperature-acclimated microorganism solution at a mixing ratio of 1:50 to 1: 80.

4. The method according to claim 1, wherein the step S3 includes:

and mixing the soaked raw material mixture with sludge to be purified, adding a catalytic enzyme biological composting agent, fully mixing, exposing to the air, standing for 10-15 days, and turning over once in the fifth day and the tenth day to obtain the purified soil.

5. The method according to claim 1, wherein the soaked raw material mixture and the sludge to be purified are uniformly mixed and stirred according to a mass ratio of 1: 80-1: 120.

6. The method as claimed in claim 5, wherein the soaked raw material mixture and the sludge to be purified are mixed and stirred uniformly according to the mass ratio of 1: 100.

7. The method according to claim 1, wherein the catalytic enzyme bio-composting agent is added in an amount of 0.1-0.5% of the sludge to be purified.

8. The method as claimed in claim 1, wherein the grain size of the rice chaff is 2-5 mm, and the grain size of the straw is 3-6 mm; the mass ratio of the rice chaff to the straw mixture is 1: 1-3: 2.

9. The method of claim 1, wherein the Maifanitum mineral particles are irregularly shaped with a largest dimension of no more than 10 cm.

10. The method as claimed in claim 1, wherein the Maifanitum mineral particles are irregular in shape and have a size of 3-5 cm.