A water treatment nutrient slow-release block and a method of preparing the same

Abstract

The application relates to a water treatment nutrient slow-release block and a preparation method thereof, which comprises a nutrient substance and a coupling agent, wherein the nutrient substance comprises at least one of industrial organic matter, livestock and poultry manure and agricultural organic matter, and the coupling agent comprises at least one of polyethylene glycol, trimethylolpropane, chlorinated paraffin, castor oil and calcium oxide. The nutrient substance in the embodiment of the application is industrial organic matter, livestock and poultry manure and agricultural organic matter, which are common raw materials and are low in price. The nutrient substance is mixed with the coupling agent, calcium oxide generates calcium hydroxide when meeting water, and further reacts with carbon dioxide in the air to generate calcium carbonate, so that the nutrient substance is wrapped and connected as a whole, has certain mechanical strength, the release of the nutrient substance is slowed down, the release speed of the nutrient substance can be controlled, and the release time is prolonged. Moreover, the chlorinated paraffin further plays a certain shielding role, and further blocks the rapid release of the nutrient substance.

Description

Technical Field

[0001] This application relates to the field of fertilizer technology, and in particular to a water treatment nutrient slow-release block and its preparation method. Background Technology

[0002] With rapid socio-economic development and rising living standards, environmental problems are becoming increasingly severe. Pollution of rivers and lakes not only affects the balance of aquatic ecosystems but also threatens the safety of human drinking water. The root cause of river and lake pollution is that the amount of pollutants carried by the water bodies exceeds their own purification capacity. The high concentration of pollutants leads to the continuous deterioration of water quality, and various treatment solutions have had little effect. Even after source control and interception, a large amount of sewage is still directly discharged into rivers and lakes, increasing the difficulty of river and lake water treatment and subsequent maintenance, and making it difficult to maintain the purified water quality in the long term.

[0003] The lake water is mainly treated by adding polyaluminum chloride (PAC) to remove phosphorus and improve water transparency, but this also produces a large amount of chemical precipitation. Alternatively, sodium hypochlorite can be added to reduce ammonia nitrogen and thus reduce total nitrogen content, but this can have a certain impact on the aquatic ecosystem. Excessive addition can cause mass fish deaths and a sharp deterioration in water quality. Another option is to add water treatment microbial strains to reduce the total nitrogen and COD content of the lake water, but this requires long-term and frequent addition, and each addition only lasts for 1-7 days, which is short-lived.

[0004] Therefore, current methods for improving lake water quality have drawbacks such as high cost, unstable effects, and short duration of effect. Summary of the Invention

[0005] This application provides a water treatment nutrient slow-release block and its preparation method to solve the drawbacks of related technologies for improving lake water quality, such as high addition cost, unstable effect, and short maintenance time.

[0006] In a first aspect, a water treatment nutrient slow-release block is provided, comprising nutrients and a coupling agent, wherein the nutrients comprise at least one of industrial organic matter, livestock and poultry manure and agricultural organic matter, and the coupling agent comprises at least one of polyethylene glycol, trimethylolpropane, chlorinated paraffin, castor oil and calcium oxide.

[0007] In some embodiments, the mass ratio of the nutrient to the coupling agent is (5-10):1.

[0008] In some embodiments, the nutrients include industrial organic matter, livestock and poultry manure, and agricultural organic matter. The industrial organic matter includes industrial flour and industrial starch, the livestock and poultry manure includes cow manure, sheep manure, chicken manure, and pig manure, and the agricultural organic matter includes distiller's grains, wheat husks, and rice husks.

[0009] In some embodiments, the mass ratio of industrial flour, industrial starch, distiller's grains, wheat husks, rice husks, cow dung, sheep dung, chicken dung, and pig dung is (3-6):(3-6):(3-5):(3-5):(3-5):(2-3):(2-3):(2-3):(1-2).

[0010] In some embodiments, the coupling agent includes polyethylene glycol, trimethylolpropane, chlorinated paraffin, castor oil, and calcium oxide.

[0011] In some embodiments, the mass ratio of polyethylene glycol, trimethylolpropane, chlorinated paraffin, castor oil and calcium oxide is (10-30):(1-10):(10-30):(1-10):(10-20).

[0012] In some embodiments, a counterweight is also added to the water treatment nutrient slow-release block.

[0013] Secondly, a method for preparing any of the above-mentioned water treatment nutrient slow-release blocks is provided, comprising the following steps:

[0014] The livestock and poultry manure is thoroughly mixed with agricultural organic matter, and microbial composting agents and water are sprayed during the mixing process to make the moisture content of the mixture reach the set moisture content, and then it is composted and fermented.

[0015] The fermented mixture is thoroughly mixed with industrial organic matter, and water is added until it becomes semi-solid.

[0016] The semi-solid mixture is placed into a mold and baked at a set temperature to obtain a water treatment nutrient slow-release block.

[0017] In some embodiments, the set moisture content is 40% to 50%.

[0018] In some embodiments, the set temperature is 50°C to 80°C.

[0019] The beneficial effects of the technical solution provided in this application include:

[0020] This application provides a water treatment nutrient slow-release block and its preparation method. The nutrients in this application are industrial organic matter, livestock and poultry manure, and agricultural organic matter, which are common and inexpensive raw materials. When mixed with a coupling agent, calcium oxide reacts with water to form calcium hydroxide, which further reacts with atmospheric carbon dioxide to form calcium carbonate, encapsulating the nutrients and binding them into a whole. This provides the nutrients with a certain mechanical strength, slowing down the release of the nutrients and thus controlling the release rate, thereby extending the release time. Furthermore, the chlorinated paraffin further acts as a shield, further preventing the rapid release of nutrients. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A flowchart illustrating the preparation method of water treatment nutrient slow-release blocks provided in this application embodiment. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] This application provides a water treatment nutrient slow-release block, which includes nutrients and a coupling agent. The nutrients include at least one of industrial organic matter, livestock and poultry manure and agricultural organic matter, and the coupling agent includes at least one of polyethylene glycol, trimethylolpropane, chlorinated paraffin, castor oil and calcium oxide.

[0025] The nutrients in this embodiment are industrial organic matter, livestock and poultry manure, and agricultural organic matter, which are common and inexpensive raw materials. When mixed with a coupling agent, calcium oxide reacts with water to form calcium hydroxide, which further reacts with atmospheric carbon dioxide to form calcium carbonate, encapsulating the nutrients and binding them together to provide mechanical strength. This slows down the release of nutrients, thus controlling the release rate and extending the release time. Furthermore, the chlorinated paraffin further acts as a shield, further preventing the rapid release of nutrients.

[0026] Nutrient slow-release blocks slowly release nutrients needed by microorganisms into the water body, maintaining the total number of microorganisms per unit water body. While the microorganisms consume the released nutrients, they also degrade and digest the recalcitrant organic matter in the natural water body. In an alternating aerobic and anoxic environment, they provide a high-quality carbon source for denitrifying bacteria to carry out the nitrogen removal process.

[0027] Nutrient slow-release blocks can be completely degraded by natural aquatic microorganisms within 1-3 years, leaving a small amount of plant residue, which is an environmentally friendly substance.

[0028] Nutrient slow-release blocks are porous and can serve as an excellent carrier for the growth of water treatment microorganisms.

[0029] In some preferred embodiments, the mass ratio of the nutrient to the coupling agent is (5-10):1.

[0030] In some preferred embodiments, the nutrients include industrial organic matter, livestock and poultry manure, and agricultural organic matter. The industrial organic matter includes industrial flour and industrial starch. The livestock and poultry manure includes cow manure, sheep manure, chicken manure, and pig manure. The agricultural organic matter includes distiller's grains, wheat husks, and rice husks. The mass ratio of industrial flour, industrial starch, distiller's grains, wheat husks, rice husks, cow manure, sheep manure, chicken manure, and pig manure is (3-6):(3-6):(3-5):(3-5):(3-5):(2-3):(2-3):(2-3):(1-2).

[0031] In some preferred embodiments, the coupling agent comprises polyethylene glycol, trimethylolpropane, chlorinated paraffin, castor oil and calcium oxide, and the mass ratio of polyethylene glycol, trimethylolpropane, chlorinated paraffin, castor oil and calcium oxide is (10-30):(1-10):(10-30):(1-10):(10-20).

[0032] In some preferred embodiments, a counterweight is also added to the water treatment nutrient slow-release block. The weight of the counterweight can be adjusted according to the state of the nutrient slow-release block in the water, allowing it to achieve three working states: sinking, suspended, and floating.

[0033] The counterweight can be made of materials such as crushed stone.

[0034] See Figure 1 As shown in the embodiments of this application, a method for preparing water treatment nutrient slow-release blocks is also provided, which includes the following steps:

[0035] 101: Thoroughly mix livestock and poultry manure with agricultural organic matter, and spray microbial composting agents and water during the mixing process to bring the moisture content of the mixture to a set level, and then carry out composting and fermentation. The set moisture content can be determined according to the actual preparation conditions; for example, the set moisture content is 40% to 50%.

[0036] The composting process includes: firstly, the mixture is subjected to a first aerobic composting fermentation, during which the pile is turned regularly. The first aerobic composting fermentation ends when the temperature of the pile drops below 48°C. Then, the mixture is transferred to a storage silo for a second fermentation, during which the pile is not turned, until the pile is fully composted.

[0037] The amount of microbial composting agent and water is determined according to actual needs. For example, the amount of microbial composting agent added is 100 parts by mass of the total amount of livestock and poultry manure and agricultural organic matter to 0.1 to 1 parts by mass of microbial composting agent. The amount of water added is used to control the moisture content after mixing to be in the range of 40% to 50%.

[0038] 102: Thoroughly mix the fermented mixture with industrial organic matter, and add water until it becomes semi-solid.

[0039] 103: Place the semi-solid mixture into a mold, bake and cool it at a set temperature to obtain a water treatment nutrient slow-release block. The set temperature can be determined according to the actual preparation situation; for example, the set temperature is 50℃~80℃.

[0040] The water treatment nutrient slow-release blocks in Examples 1-5 were prepared using the above-described preparation method. The mass ratios of each component are shown in Table 1 below, and the longest release times are shown in Table 2.

[0041] Table 1 Formulation parameters for Examples 1-5

[0042]

[0043] Table 2

[0044] Maximum release time (days) COD concentration in water (mg / L) Total nitrogen content in water (mg / L) Example 1 843 11 0.86 Example 2 721 13 0.74 Example 3 533 16 0.63 Example 4 431 18 0.44 Example 5 328 19 0.34

[0045] Combining Tables 1 and 2, the higher the mass ratio of nutrients to coupling agent, the higher the proportion of organic matter, the easier it is for organic matter to be released, the higher the COD content in the water, and the shorter the longest release time. The easier it is for organic matter to be released, which is conducive to denitrification by bacteria and the lower the total nitrogen content in the water.

[0046] Compared to existing methods, the water treatment nutrient slow-release block provided in this application can extend the release time, with the longest release time reaching 843 days.

[0047] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0048] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A water treatment nutrient slow-release block, characterized in that, It includes nutrients and a coupling agent, wherein the mass ratio of the nutrients to the coupling agent is (5~6):

1. The nutrients include industrial organic matter, livestock and poultry manure, and agricultural organic matter. The industrial organic matter includes industrial flour and industrial starch. The livestock and poultry manure includes cow manure, sheep manure, chicken manure, and pig manure. The agricultural organic matter includes distiller's grains, wheat husks, and rice husks. The mass ratio of industrial flour, industrial starch, distiller's grains, wheat husks, rice husks, cow manure, sheep manure, chicken manure, and pig manure is 5:5:4:4:4:2:2:2:

1. The coupling agent includes polyethylene glycol, trimethylolpropane, chlorinated paraffin, castor oil, and calcium oxide. The mass ratio of polyethylene glycol, trimethylolpropane, chlorinated paraffin, castor oil, and calcium oxide is 20:5:30:1:

20.

2. The water treatment nutrient slow-release block as described in claim 1, characterized in that: The water treatment nutrient slow-release block also contains added weight.

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