CN111807511A

CN111807511A - Novel composite carbon source

Info

Publication number: CN111807511A
Application number: CN202010569195.7A
Authority: CN
Inventors: 范兴义
Original assignee: Shandong Sanjia Environmental Protection New Materials Co ltd
Current assignee: Shandong Sanjia Environmental Protection New Materials Co ltd
Priority date: 2020-06-20
Filing date: 2020-06-20
Publication date: 2020-10-23

Abstract

The invention discloses a novel composite carbon source, which comprises the following components: C2-C4 hydrocarbon, solid fatty alcohol mixture, sodium acetate, sodium propionate and methanol, wherein the raw materials are C2-C4 hydrocarbon: 20-25%, solid fatty alcohol mixture: 20-30%, sodium acetate: 4-6%, sodium propionate: 4-6 percent, the balance being methanol, and C2-C4 hydrocarbon containing C2H 2: 1 to 10 percent; C2H 4: 10 to 20 percent; C2H 6: 10 to 20 percent; C3H 6: 10 to 20 percent; C3H 8: 10 to 20 percent; C4H 8: 10 to 20 percent; C4H 10: 10-20%, wherein the solid fatty alcohol mixture comprises octadecanol: 50-70 percent of methanol, 20-40 percent of hexadecanol and 90-95 percent of methanol. The invention has the advantages of improving COD and BOD equivalent values, greatly improving load, and enhancing the metabolic activity of bacteria, thereby increasing the speed of synthesizing new cell substances and further improving the sewage treatment load.

Description

Novel composite carbon source

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a novel composite carbon source.

Background

Because the urbanization process is continuously accelerated, the discharge amount of domestic sewage and eutrophic substances are increased, and the eutrophication of lakes and reservoirs is increasingly serious. At present, related departments require that a sewage treatment plant firstly utilizes biological nitrogen and phosphorus removal and then can discharge sewage into a receiving water body to prevent environment pollution. The nitrification and denitrification are efficient biological denitrification technologies, and are widely applied to the field of sewage treatment at present. In the aspect of microbial denitrification, heterotrophic denitrifying bacteria consume additional organic matter as a carbon source and provide energy for denitrification. The existing sewage treatment plants in China, particularly the sewage treatment plants in the southern areas of China, generally have the problem of low denitrification efficiency caused by insufficient denitrification carbon source. In order to solve the problem, on one hand, the area of a denitrification anoxic zone can be increased, and the denitrification time is prolonged to increase the denitrification effect, but the method needs to expand a sewage treatment plant, so that the capital cost is high, and the operability is not strong; on the other hand, the denitrification rate can be improved by adding an external carbon source into the anoxic zone to supplement the carbon source, but if the external carbon source is excessive or the carbon source is not properly selected, the system operation cost is increased, and the COD of the sewage treatment plant is overproof.

At present, a series of researches on the adding type and adding amount of external carbon sources at home and abroad are carried out, and the influence of different external carbon sources on the denitrification process of the system is found to be different, so that the treatment effect is different even if the adding amount of the external carbon sources is the same. Commonly used external carbon sources include mainly: methanol, ethanol, glucose, sodium acetate, and the like. When the methanol is used as a carbon source, the cost is relatively high, the response time is slow, a certain toxic effect is achieved, and the effect is not good when the methanol is used for emergency feeding of a sewage plant; the denitrification rate of the ethanol is lower than that of the methanol and the sodium acetate; the treatment effect of glucose as an external carbon source is good, however, the glucose as a multi-molecular compound is easy to cause mass propagation of bacteria, so that sludge is expanded, COD (chemical oxygen demand) of effluent is increased, the quality of the effluent is influenced, and compared with an alcohol carbon source, the glucose is easier to generate the phenomenon of nitrite nitrogen accumulation, so that the glucose is not advocated to be used as an external carbon source in a large amount; the sodium acetate has the advantages of immediate response to the denitrification process, capability of being used for emergency treatment during the operation of a water plant, easiness in utilization of denitrifying bacteria and best denitrification effect due to the fact that the sodium acetate is small-molecular organic acid, but the sodium acetate is expensive and high in sludge yield, and the problem of sludge disposal of the existing sewage plant is a great problem, so that the application of the sodium acetate to large-scale feeding of the sewage plant is almost impossible.

Disclosure of Invention

The invention aims to provide a novel composite carbon source which has the advantages of improving COD (chemical oxygen demand) and BOD (biochemical oxygen demand) equivalent values, greatly improving load, enhancing bacterial metabolic activity, increasing the speed of synthesizing new cell substances and further improving sewage treatment load, solving the problems that at present, the addition type and the addition amount of external carbon sources at home and abroad are subjected to a series of researches, and the influences of different external carbon sources on the denitrification process of a system are different, and the treatment effects are different even if the addition amount of the external carbon sources is the same. Commonly used external carbon sources include mainly: methanol, ethanol, glucose, sodium acetate, and the like. When the methanol is used as a carbon source, the cost is relatively high, the response time is slow, a certain toxic effect is achieved, and the effect is not good when the methanol is used for emergency feeding of a sewage plant; the denitrification rate of the ethanol is lower than that of the methanol and the sodium acetate; the treatment effect of glucose as an external carbon source is good, however, the glucose as a multi-molecular compound is easy to cause mass propagation of bacteria, so that sludge is expanded, COD (chemical oxygen demand) of effluent is increased, the quality of the effluent is influenced, and compared with an alcohol carbon source, the glucose is easier to generate the phenomenon of nitrite nitrogen accumulation, so that the glucose is not advocated to be used as an external carbon source in a large amount; the sodium acetate has the advantages of being capable of immediately responding to a denitrification process, being used for emergency treatment during operation of a water plant, being easy to utilize denitrifying bacteria and having the best denitrification effect due to small-molecular organic acid, but being expensive and high in sludge yield, and the problem that the sludge treatment problem of the existing sewage plant is a great problem of difficulty and difficulty, so that the application of the sodium acetate to large-scale feeding of the sewage plant is almost impossible.

In order to achieve the purpose, the invention provides the following technical scheme: a novel composite carbon source comprising: a C2-C4 hydrocarbon, a solid fatty alcohol mixture, sodium acetate, sodium propionate, and methanol.

Preferably, the raw material ratio is C2-C4 hydrocarbon: 20-25%, solid fatty alcohol mixture: 20-30%, sodium acetate: 4-6%, sodium propionate: 4-6% of methanol and the balance of methanol.

Preferably, the C2-C4 hydrocarbon compound comprises C2H 2: 1 to 10 percent; C2H 4: 10 to 20 percent; C2H 6: 10 to 20 percent; C3H 6: 10 to 20 percent; C3H 8: 10 to 20 percent; C4H 8: 10 to 20 percent; C4H 10: 10 to 20 percent.

Preferably, the solid fatty alcohol mixture comprises octadecanol: 50-70% of hexadecanol and 20-40% of hexadecanol.

Preferably, the methanol concentration is 90-95%.

Compared with the prior art, the invention has the beneficial effects that: the COD equivalent value and the BOD equivalent value are improved, the load can be greatly improved, the metabolic activity of the eutrophic bacteria is strong, the speed of synthesizing new cell substances is high, the growth rate of denitrifying bacteria can be improved by 50% -80%, the sludge discharge is reduced by more than 20%, the sewage treatment load can be improved, the novel composite carbon source is reduced relative to other carbon sources, the effect is good, the adding amount can be reduced by 50% at most from the consideration of the comprehensive cost, and the novel composite carbon source is saved by 20% -50% compared with the traditional carbon source.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical scheme of the novel composite carbon source provided by the invention

Example 1:

a novel composite carbon source comprising: C2-C4 hydrocarbon, solid fatty alcohol mixture, sodium acetate, sodium propionate and methanol, wherein the raw materials are C2-C4 hydrocarbon: 25%, solid fatty alcohol mixture: 30%, sodium acetate: 6%, sodium propionate: 6 percent, and the balance of methanol, wherein the C2-C4 hydrocarbon comprises C2H 2: 10 percent; C2H 4: 10 percent; C2H 6: 20 percent; C3H 6: 20 percent; C3H 8: 20 percent; C4H 8: 10 percent; C4H 10: 10%, and the solid fatty alcohol mixture comprises octadecanol: 70 percent, 30 percent of hexadecanol and 95 percent of methanol.

Example 2:

a novel composite carbon source comprising: C2-C4 hydrocarbon, solid fatty alcohol mixture, sodium acetate, sodium propionate and methanol, wherein the raw materials are C2-C4 hydrocarbon: 20%, solid fatty alcohol mixture: 20%, sodium acetate: 6%, sodium propionate: 6 percent, and the balance of methanol, wherein the C2-C4 hydrocarbon comprises C2H 2: 5 percent; C2H 4: 20 percent; C2H 6: 15 percent; C3H 6: 20 percent; C3H 8: 15 percent; C4H 8: 15 percent; C4H 10: 10%, and the solid fatty alcohol mixture comprises octadecanol: 60 percent, 40 percent of hexadecanol and 90 percent of methanol concentration

Example 3:

a novel composite carbon source comprising: C2-C4 hydrocarbon, solid fatty alcohol mixture, sodium acetate, sodium propionate and methanol, wherein the raw materials are C2-C4 hydrocarbon: 25%, solid fatty alcohol mixture: 30%, sodium acetate: 5%, sodium propionate: 5 percent, the balance being methanol, and the C2-C4 hydrocarbon comprises C2H 2: 10 percent; C2H 4: 15 percent; C2H 6: 15 percent; C3H 6: 20 percent; C3H 8: 20 percent; C4H 8: 10 percent; C4H 10: 10%, and the solid fatty alcohol mixture comprises octadecanol: 70 percent, 30 percent of hexadecanol and 95 percent of methanol

Example 4:

a novel composite carbon source comprising: C2-C4 hydrocarbon, solid fatty alcohol mixture, sodium acetate, sodium propionate and methanol, wherein the raw materials are C2-C4 hydrocarbon: 20%, solid fatty alcohol mixture: 25%, sodium acetate: 5%, sodium propionate: 5 percent, the balance being methanol, and the C2-C4 hydrocarbon comprises C2H 2: 10 percent; C2H 4: 15 percent; C2H 6: 20 percent; C3H 6: 20 percent; C3H 8: 10 percent; C4H 8: 10 percent; C4H 10: 15%, and the solid fatty alcohol mixture comprises octadecanol: 65%, hexadecanol 35%, methanol concentration of 90%

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A novel composite carbon source, comprising: a C2-C4 hydrocarbon, a solid fatty alcohol mixture, sodium acetate, sodium propionate, and methanol.

2. A novel complex carbon source according to claim 1, characterized in that: the raw materials are C2-C4 hydrocarbon: 20-25%, solid fatty alcohol mixture: 20-30%, sodium acetate: 4-6%, sodium propionate: 4-6% of methanol and the balance of methanol.

3. A novel complex carbon source according to claim 1, characterized in that: the C2-C4 hydrocarbon comprises C2H 2: 1 to 10 percent; C2H 4: 10 to 20 percent; C2H 6: 10 to 20 percent; C3H 6: 10 to 20 percent; C3H 8: 10 to 20 percent; C4H 8: 10 to 20 percent; C4H 10: 10 to 20 percent.

4. A novel complex carbon source according to claim 1, characterized in that: the solid fatty alcohol mixture comprises octadecanol: 50-70% of hexadecanol and 20-40% of hexadecanol.

5. A novel complex carbon source according to claim 1, characterized in that: the methanol concentration is 90-95%.