Efficient anaerobic method for reinforcing granular sludge through combination of ceramic membrane pretreatment and magnetic method

Abstract

The invention discloses an efficient anaerobic method for reinforcing granular sludge by combining ceramic membrane pretreatment with a magnetic method, and relates to the technical field of water treatment equipment. The efficient anaerobic method for reinforcing the granular sludge by combining the ceramic membrane pretreatment with the magnetic method comprises the following steps: S1, pretreating a kitchen three-phase separation liquid by using a ceramic membrane, and removing relatively large particles and suspended matters in water; s2, enabling the pretreated kitchen three-phase separation liquid to flow through a magnet device through a pipeline, magnetizing the wastewater, and reducing precipitation of calcium carbonate crystals in the pipeline and the inner wall of equipment; gas generated in the reaction is collected, so that recycling of wastewater is realized; a ceramic membrane and a magnet device are arranged in the whole method, so that larger particles and suspended matters of the kitchen three-phase separation liquid entering the UASB anaerobic reactor can be effectively reduced, and the treatment efficiency of the UASB anaerobic reactor is enhanced; meanwhile, the magnet is combined to magnetize the wastewater, so that the deposition of calcium carbonate crystals on the pipeline and the inner wall of equipment is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment equipment, in particular to a high-efficiency anaerobic method for combining ceramic membrane pretreatment with magnetic method to strengthen granular sludge. Background Art

[0002] Anaerobic biological treatment technology is a process that uses facultative anaerobic and anaerobic microbial communities to convert organic matter into methane and carbon dioxide under anaerobic conditions. It is also called anaerobic digestion. This method performs well in sewage treatment and can significantly reduce the organic content in sewage while producing biogas. It is an efficient sewage treatment method, especially for urban domestic sewage with high organic content, high-concentration organic wastewater generated by food processing, brewing, papermaking, pharmaceuticals, textiles and other industries, as well as livestock and poultry breeding wastewater, crop residues and other agricultural wastes rich in organic matter. The effect is particularly significant. However, most of the current anaerobic biological treatment technologies use anaerobic reactors to achieve organic matter in sewage. However, these anaerobic reactors usually have the disadvantages of only relying on backwashing for cleaning, the filter bed is easy to be blocked, the sludge is easy to lose, the reactor is large in size, and it is difficult to maintain. The use of a fully reactive anaerobic reactor requires continuous stirring, which is not conducive to the formation and stability of granular sludge. There are also further optimizations and improvements to this type of anaerobic reactor, but the problem of easy clogging of the filter bed still exists. For example, an anaerobic biological treatment method for high-concentration organic wastewater disclosed in publication number CN105084532B uses an anaerobic reactor to realize the conversion of organic matter in the sewage, only relies on backwashing for cleaning, and the filter bed is easy to be blocked. Therefore, a high-efficiency anaerobic method of combining ceramic membrane pretreatment with magnetic method to strengthen granular sludge is proposed. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a high-efficiency anaerobic method of ceramic membrane pretreatment combined with magnetic enhancement of granular sludge, which solves the problem that other types of anaerobic reactors are used to transform organic matter in sewage, and the filter bed is easily blocked by backwashing for cleaning, while the use of a fully reactive anaerobic reactor requires continuous stirring, which is not conducive to the formation and stability of granular sludge.

[0004] To achieve the above objectives, the present invention is implemented by the following technical scheme: A high-efficiency anaerobic method for ceramic membrane pretreatment combined with magnetic method to strengthen granular sludge, comprising the following steps:

[0005] S1. Use ceramic membrane to pre-treat the three-phase separation liquid of kitchenware to remove large particles and suspended matter in the water;

[0006] S2, passing the pretreated three-phase separated liquid of kitchenware through a pipeline through a magnet;

[0007] S3, the three-phase separation liquid of the kitchen and the food flows through the magnet and enters the bottom of the UASB anaerobic reactor to remove organic matter;

[0008] S4. The gas discharged from the UASB anaerobic reactor is collected by a gas collection device, and the gas is recycled.

[0009] Preferably, a ceramic membrane is used for pretreatment to reduce the concentration of large particles and suspended matter in the water during subsequent treatment.

[0010] Preferably, the pre-treated three-phase separated liquid from the kitchen is passed through a magnet through a pipeline to magnetize the wastewater, thereby reducing the precipitation of calcium carbonate crystals that are difficult to remove on the inner walls of the pipeline and equipment.

[0011] Preferably, a UASB anaerobic reactor is used to remove high concentrations of organic matter in water, thereby treating the three-phase separation liquid of kitchen waste.

[0012] Preferably, a gas collection device is provided after the UASB anaerobic reactor, and the main component of the gas is methane.

[0013] The present invention provides a high-efficiency anaerobic method for ceramic membrane pretreatment combined with magnetic method to strengthen granular sludge. Compared with the prior art, it has the following beneficial effects:

[0014] (1) The combined use of ceramic membrane pretreatment and UASB anaerobic reactor can improve the treatment effect of the reactor and increase the methane production.

[0015] (2) The patent of the present invention combines the effect of magnetic field to achieve scale prevention of pipelines and reactors. Under the action of magnetic field, calcium carbonate can be transformed to form a crystal form called aragonite. Aragonite is a crystalline form generated in high-calcium wastewater, and its lattice structure is different from that of traditional calcium carbonate crystal forms. The presence of magnetic field changes the growth mode of calcium carbonate crystals, making aragonite the main crystal component. In high-calcium wastewater, the magnetic field will guide calcium carbonate crystals to aggregate and precipitate in the form of aragonite. Due to the structural characteristics of aragonite, it is more stable than other calcium carbonate crystal forms and is not easy to scale on the walls of pipelines and reactors. This characteristic is very useful for solving the scaling problem in the treatment of high-calcium wastewater. By converting calcium carbonate into aragonite under the action of magnetic field, the occurrence of scaling can be effectively prevented. In this way, the operating efficiency of wastewater treatment equipment can be improved, while reducing the maintenance and cleaning costs of the equipment.

[0016] (3) This technology can achieve efficient anaerobic treatment and resource utilization of three-phase separation of food wastewater. By combining ceramic membrane pretreatment technology, magnetic field anti-scaling technology and UASB anaerobic reactor technology, suspended matter in wastewater can be effectively separated and treated, and the solid matter produced can be converted into valuable products such as feed protein additives and biodiesel. At the same time, after the three-phase separation of food wastewater is treated in the UASB anaerobic reactor, biogas can be produced to achieve resource recovery of organic matter in wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a process flow chart of the present invention;

[0018] Figure 2 It is a schematic diagram of the device of the present invention;

[0019] In the figure, 1-raw water tank, 2-ceramic membrane separation device, 3-magnet device, 4-water inlet peristaltic pump, 5-UASB anaerobic reactor, 6-gas collection device. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-2 The present invention provides a high-efficiency anaerobic method for ceramic membrane pretreatment combined with magnetic method to strengthen granular sludge, comprising the following steps:

[0022] S1. Pre-treat the three-phase separated liquid of kitchenware to remove larger particles and suspended matter in the water; use ceramic membrane for pre-treatment to reduce the concentration of larger particles and suspended matter in the water during subsequent treatment;

[0023] S2, passing the pretreated three-phase separated liquid of kitchen waste through a pipeline through a magnet; passing the pretreated three-phase separated liquid of kitchen waste through a pipeline through a magnet can magnetize the wastewater, thereby reducing the precipitation of calcium carbonate crystals that are difficult to remove on the inner walls of pipelines and equipment; magnetizing the wastewater with a magnet can change the calcium carbonate crystal phase in the water to generate an easily removable calcium carbonate crystal phase, thereby avoiding the difficult-to-remove calcium carbonate crystals from being deposited on the inner walls of pipelines and equipment, causing instability in the water intake;

[0024] S3, the three-phase separation liquid of food and kitchen flowing through the magnet enters the bottom of the UASB anaerobic reactor to remove organic matter; the three-phase separation liquid of food and kitchen has a high organic matter content, which can make the UASB anaerobic reactor in a relatively stable operating state; the use of the UASB anaerobic reactor can effectively remove high-concentration organic matter in the water due to its high organic load and high sludge concentration, so it can be used to treat the three-phase separation liquid of food and kitchen;

[0025] S4. Use a gas collection device to collect the gas discharged from the UASB anaerobic reactor and recycle the gas; a gas collection device is set after the UASB anaerobic reactor. The main component of the gas is methane, which can be collected and recycled, thereby realizing the resource utilization of wastewater.

[0026] The use of ceramic membrane pretreatment combined with UASB anaerobic reactor can reduce the concentration of suspended solids in the three-phase separation liquid of food waste entering the UASB anaerobic reactor, avoid the blockage of UASB anaerobic reactor by larger particles and suspended solids, and make it inefficient, thereby improving the effluent quality; at the same time, it also avoids larger particles and suspended solids entering the UASB anaerobic reactor and causing damage to microorganisms; the use of ceramic membrane helps to maintain the stability of the UASB reactor, especially during the membrane fouling cycle, and the service life of the membrane can be effectively extended by backwashing, thereby enhancing the stability of the system; the pretreatment effect of ceramic membrane can reduce the sludge production in the UASB reactor, because some organic matter has been removed in the pretreatment stage; the combined use of ceramic membrane and UASB reactor can increase the methane production, because cleaner inlet conditions are conducive to the growth and activity of methanogens. These benefits show that the combined use of ceramic membrane pretreatment and UASB anaerobic reactor is an effective wastewater treatment technology that can improve treatment efficiency, improve effluent quality, and enhance the stability and economy of the system.

[0027] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency anaerobic method for ceramic membrane pretreatment combined with magnetic enhancement of granular sludge, characterized in that: The following steps are involved: S1. Pre-treat the three-phase separated liquid from the kitchen to remove large particles and suspended matter in the water; S2, passing the pretreated three-phase separated liquid of kitchenware through a pipeline through a magnet; S3, the three-phase separation liquid of the kitchen and the food flows through the magnet and enters the bottom of the UASB anaerobic reactor to remove organic matter; S4. The gas discharged from the UASB anaerobic reactor is collected by a gas collection device, and the gas is recycled.

2. The high-efficiency anaerobic method for pretreatment of granular sludge by ceramic membrane combined with magnetic method according to claim 1, characterized in that: Use ceramic membranes for pretreatment to reduce the concentration of large particles and suspended matter in the water during subsequent treatment.

3. The high-efficiency anaerobic method for pretreatment of granular sludge by ceramic membrane combined with magnetic method according to claim 1, characterized in that: The pre-treated three-phase separation liquid from the kitchen is passed through the magnet through a pipeline to magnetize the wastewater and reduce the precipitation of calcium hydrochloride crystals that are difficult to remove on the inner walls of the pipeline and equipment.

4. The high-efficiency anaerobic method for pretreatment of granular sludge by ceramic membrane combined with magnetic method according to claim 1, characterized in that: The UASB anaerobic reactor is used to remove high concentrations of organic matter in the water, thereby treating the three-phase separation liquid from the kitchen.

5. The high-efficiency anaerobic method for pretreatment of granular sludge by ceramic membrane combined with magnetic method according to claim 1, characterized in that: A gas collection device is set up after the UASB anaerobic reactor, and the main component of the gas is methane.

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