CN102807284A - Application of Chinese crinums to purification of livestock and poultry breeding biogas liquid - Google Patents

Abstract

The invention discloses the application of a skirt belt in treating biogas slurry from livestock and poultry breeding, and belongs to the field of waste water treatment. In the environment polluted by biogas slurry from livestock and poultry breeding, the planting of saline is made full use of the absorption of NH ₄ ⁺ -N, TN, TP, COD _cr and other pollutants in the biogas slurry of livestock and poultry, as well as the tenacious vitality, It can be planted directly, does not require special management, and is perennial, permanently solving the problem of biogas slurry pollution in livestock and poultry farming. It has the advantages of low investment, low operating cost, good effect, simple and easy operation, and can guarantee the purification effect of the constructed wetland system in winter. The harvested Luo Qundai can be used for clearing heat and detoxifying, removing blood stasis and relieving pain, heat sores, swelling, lymphadenitis, pharyngitis, fractures, snake bites and other diseases. Utilizing skirt belts to treat wastewater combines environmental protection with landscape construction and economic construction, and has the characteristics of combining theoretical research with practical application.

Description

Application of Luo Qun belt to purify biogas slurry from livestock and poultry breeding

technical field

The invention relates to the field of livestock and poultry breeding biogas slurry treatment, in particular to an application of artificial wetland plants to purify livestock and poultry breeding biogas slurry.

Background technique

In recent years, with the rapid development of the large-scale and intensive livestock and poultry breeding industry, the environmental pollution caused by the livestock breeding industry has become increasingly serious, and its impact on rural drinking water safety, irrigation water, soil, agricultural products and air quality and rural The living environment poses a great threat. Anaerobic digestion technology has been widely used in the bioenergy development and pollution control of livestock and poultry wastewater, which can effectively suppress the primary pollution of livestock and poultry wastewater; however, the biogas slurry of many large-scale farms is directly discharged, resulting in Serious secondary pollution, the ecological purification treatment of livestock and poultry breeding biogas slurry is the only way to completely harmless treatment and resource utilization of breeding sewage.

As far as the current water quality of biogas slurry in my country's aquaculture industry is concerned, it is difficult to meet the discharge requirements by simply using physical, chemical or biological treatment methods. A combination of multiple treatment methods is required, but this leads to high technical requirements for wastewater treatment processes, investment and operation. The cost is too high to be widely used. Constructed wetland technology can just make up for the limited economic capacity of the existing breeding industry and the lack of technical personnel with a certain level of operation and management. It is especially suitable for farms located in rural areas.

Constructed wetland is a new type of wastewater treatment technology. It is a treatment system constructed by artificially optimizing the simulated wetland system, which has the comprehensive degradation function of the ecosystem and can be supervised and controlled by humans. It is built to give full play to the wastewater treatment function of the wetland ecosystem and improve the sewage purification effect. Its sewage purification function is incomparable to the natural wetland system. It plays a unique role in maintaining ecological balance and protecting biodiversity. It uses the triple synergy of physics, chemistry and biology in the ecosystem to realize the efficient purification of sewage, overcomes the shortcomings of using chemical methods in sewage treatment to easily cause secondary pollution and physical methods to treat the symptoms but not the root cause, and has the advantages of small investment , good treatment effect, convenient operation and maintenance, etc., and has a certain ecological landscape effect. Constructed wetland technology has been developed in the long run because of its unique advantages, especially in wastewater treatment, which has shown great potential for development and has become one of the research hotspots in recent years. So far, reed, vetiver, rice, calamus, calamus, water hyacinth, umbrella grass, rush, water spinach, water celery, canna and other plants have been used in the artificial wetland treatment technology, and relatively good results have been achieved. Good experimental results.

However, there are very few constructed wetland plants used to treat biogas slurry from livestock and poultry breeding. Therefore, it is very necessary to develop and utilize plant species resources that can be used to treat biogas slurry from livestock and poultry breeding to adapt to the treatment of biogas slurry from livestock and poultry breeding in different regions and with different water quality. At the same time, most of the existing artificial wetland plants have poor cold resistance and are prone to death in winter, which cannot guarantee the purification effect in low temperature environments. The dead plants enter the water body, which will easily cause secondary pollution and affect the purification effect of the wetland system. Moreover, the economic value of the studied plants is low, the cost of recycling is high, and the economic benefits are not obvious.

Contents of the invention

The purpose of the present invention is to provide a solution for the above-mentioned existing artificial wetland technology that can be used to purify biogas slurry of livestock and poultry because of insufficient plant species resources, low economic value, poor cold resistance, easy to die in winter, and unable to guarantee the purification effect of low temperature environment. A new plant resource that can be used to purify biogas slurry from livestock and poultry breeding. Using ornamental plants with high economic value to purify livestock and poultry wastewater, combining environmental protection with landscape construction, embodies the sustainable development idea of sewage treatment, ecological restoration, landscape construction and economic benefits, and has theoretical research and applied research. This provides novel ideas and theoretical basis for the practical application of rural sewage treatment. This is expected to change the operation mode of traditional ecological projects that rely on government investment for many years, which is of far-reaching significance.

In order to realize the foregoing invention object, the technical scheme that the present invention adopts is as follows:

Grow skirts are planted in artificial wetlands, and the wetland system is used to purify biogas slurry from livestock and poultry breeding.

Luo Qun belt (Leaf of Chinese Crinum), pole leaf, luxuriant banana, water laugh grass, wakame grass, water banana, turmeric leaf, water banana, kelp seven, belt seven, snake sword, dragon knife, golden martial sword, king Ribbon, sea plantain, marigold, Julan leaves. Amaryllidaceae perennial herb. The stem is short and strong, with a diameter of 10-15 cm. Leaves numerous, clustered on top of stem, sword-shaped, up to 1 m long, 7-15 cm wide, apex acuminate, margin entire, base clasping. Flower stems are erect and strong; umbels are terminal; spathes are about 10 cm long, straight, and split to the base; flowers are white, fragrant, about 20 or more; flower stalks are about 2 cm long, and the base has a long linear shape bracteoles; perianth tube slender, 8-10 cm long, 6 lobes, linear, 7-8 cm long, about 8 mm wide; stamens 6, filaments as long as lobes, green lower part, white middle part, lavender upper part , T-shaped drug yellow; pistil 1, stigma three-lobed or capitate, ovary inferior, 3-room. Fruit nearly oblate, light yellow, 5 cm in diameter. The flowering period is from June to August. The fruiting period is from November to December. Wild in riversides, villages, low-lying grass, or planted in gardens.

Medicinal value of Luo Qun Dai: Clear fire, detoxify, dissipate blood stasis, detumescence. Control carbuncle sore, bruises and fractures, headache, arthralgia. Indications for clearing away heat and detoxification, removing stasis and relieving pain, febrile sores, lymphadenitis, pharyngitis, headache, numbness, bruises, fractures, snake bites.

The inventors have found in a large number of long-term experiments that the sarong can be used as a new type of artificial wetland plant, which can effectively reduce the ammonia nitrogen (NH ₄ ⁺ —N), total nitrogen (TN), and total phosphorus in the biogas slurry of livestock and poultry breeding. (TP), chemical oxygen demand (COD _cr ) and other pollutants. Based on the above-mentioned findings, the saponins were planted in constructed wetlands for the treatment of biogas slurry from livestock and poultry breeding. Through regular monitoring and analysis of the influent and effluent water quality of the wetland system planted with rabbets, it has been fully confirmed that the rabbets can affect ammonia nitrogen (NH ₄ ⁺ —N), total nitrogen (TN), total phosphorus (TP), Chemical oxygen demand (COD _cr ) etc. have high purification capacity and can be used for purification treatment of biogas slurry from livestock and poultry breeding. Moreover, it is very vigorous, easy to survive, extremely low temperature resistant, and it is a perennial herbaceous plant, which does not need to be planted every year, and does not require special management during the entire growth process.

In summary, the beneficial effects of the present invention are:

1. After a large number of long-term experiments, the present invention finds that the skirt belt pollutes ammonia nitrogen (NH ₄ ⁺ —N), total nitrogen (TN), total phosphorus (TP), and chemical oxygen demand (COD _cr ) in the biogas slurry of livestock and poultry breeding. The substance has a pronounced purifying effect. Therefore, it is used to purify livestock and poultry breeding biogas slurry through artificial wetland technology, absorb and accumulate NH ₄ ⁺ —N, TN, TP, COD _cr and other pollutants in wastewater, thereby reducing NH ₄ ⁺ —N, TN, TP in wastewater , COD _cr and other pollutants content; when it grows to a certain biomass, through manual harvesting, the content of NH ₄ ⁺ —N, TN, TP, COD _cr and other pollutants in the wastewater can be reduced to achieve the purpose of purifying wastewater.

2. Due to its own physiological characteristics, it is easy to survive, cold-resistant, and with tenacious vitality, it will wither in the temperature below zero in winter, and it is a perennial plant, which does not need to be planted every year, and does not need special management during the whole growth process. Therefore, the operation cost is low, the effect is good, and the operation is simple and easy. At the same time, it also enriches the plant library of constructed wetland technology, bringing new progress and development space for the in-depth development of constructed wetland technology to treat eutrophic water bodies.

3. After regular harvesting, the purification of NH ₄ ⁺ —N, TN, TP, COD _cr and other pollutants in the wastewater can be realized, and the litter and leaves can be prevented from falling into the water to form secondary pollution. Harvested Luoqunia can also be used medicinally. It is mainly used for clearing heat and detoxifying, removing blood stasis and relieving pain, heat sore and swelling, lymphadenitis, pharyngitis, headache, arthralgia and numbness, bruises and bruises, fractures, and snake bites.

4. Luo Qunna not only has better purification effect of eutrophic water, but also has high medicinal value. Compared with the prior art, the present invention has obvious advantages in terms of operating cost, operation and maintenance, treatment effect, environmental protection benefit and economic benefit.

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Description of drawings

Fig. 1 is a schematic diagram of the effect of NH ₄ ⁺ —N in the treatment of livestock and poultry breeding biogas slurry with a skirt belt in Example 1

Fig. 2 is a schematic diagram of the effect of TN in the treatment of livestock and poultry breeding biogas slurry by Luo Qun belt in Example 1

Fig. 3 is a schematic diagram of the effect of TP in the treatment of livestock and poultry breeding biogas slurry by the skirt belt in embodiment 1

Fig. 4 is a schematic diagram of the effect of COD _cr in the treatment of livestock and poultry breeding biogas slurry by Luo Qun belt in Example 1

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. The specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Example 1

This embodiment is the application of Luo Qun belt to treat biogas slurry from livestock and poultry breeding, and the specific application method is as follows:

1. Construction of Constructed Wetland System

The size of the wetland system is 100cm×45cm×75cm (L×W×H); it includes the water distribution pipes installed on the top of the wetland system, and the bottom of the wetland system is the water collection tank and water outlet. Gravel layer, slag layer and sand layer are laid sequentially from the sump to the top. The constructed wetland bed is characterized in that: the inside of the wetland bed is composed of wetland filling matrix and shale hollow bricks, and there is a water collection tank at the bottom of the wetland system to collect waste water treated by the wetland system.

In order to enhance the oxygen supply capacity inside the wetland system, thereby improving the purification effect of organic matter in wastewater, shale hollow bricks are filled inside the wetland system, and the pores of the shale hollow bricks are automatically supplied to the inside of the wetland system.

In order to further improve the purification ability of the wetland system of the present invention, the above-mentioned wetland system filling matrix particle size and filling thickness have been manually screened. The wetland is filled with a 15cm-thick gravel layer with a particle size of 10-20mm, a 20cm-thick slag layer with a particle size of 1-10mm, and a sandy soil layer with a thickness of 15cm.

In order to further improve the purification ability of the wetland system of the present invention, the wetland water purification method adopts intermittent water intake, and the oxygen content inside the wetland system is further supplemented by using the period without water intake, thereby improving the automatic oxygen supply capacity inside the wetland system.

2. Example of biogas slurry treatment for livestock and poultry breeding

This experiment started on November 2, 2011 and ended on December 21, 2011, with 7 days as a treatment cycle, and a total of 5 weeks of treatment. In the natural state, the collected onion orchid seedlings were directly planted in the surface soil of the wetland and stabilized with tap water for 14 days. After the plants are stabilized, the biogas slurry from livestock and poultry breeding is treated with water from the water distribution pipe.

In the process of using constructed wetland to treat livestock and poultry breeding biogas slurry, the purification effect of constructed wetland system on pollutants such as NH ₄ ⁺ —N, TN, TP, COD _cr in wastewater under different water inflow and optimal hydraulic retention time is measured to determine The optimal water intake and optimal hydraulic retention time for this experiment.

According to the experimental results, the optimal hydraulic retention time for the Conglan Constructed Wetland System to treat the biogas slurry from livestock and poultry breeding is 6 days, and the optimal water inflow is calculated according to the following formula:

Q=Fqt/0.0365

In the formula:

Q—design flow rate of waste water, m ³ /d;

F——land area occupied by constructed wetland, ^hm2 ;

q——hydraulic load, mm/d, q is taken as 100mm/d in this test

t—hydraulic running time, d.

0.0365——conversion factor.

After calculation, the optimum water intake of the system is 0.74m ³ , so the flow rate of the water intake is 0.086cm ³ /s. In order to further improve the automatic feeding capacity of the wetland system, intermittent water intake was adopted in the test. The system is fed with water at 8:00 a.m., and the interval between each water feed is 6 days, and then the water feed is stopped for 1 day. That is, each operation cycle is 7 days, and the residence time of the sewage in the reactor is 6 days. After 6 days, the water is drained, and the reactor enters the shutdown stage for the next 1 day.

During the whole test period, the influent and effluent concentration and removal rate of NH ₄ ⁺ —N, TN, TP, COD _cr and other pollutants when Luo Qun belt purifies livestock and poultry biogas slurry are shown in Figures 1-4. It can be seen from the figure that the purification efficiencies of Luo Qun belt to NH ₄ ⁺ —N, TN, TP, COD _cr and other pollutants in wastewater are: 78.1%, 71.3%, 66.2%, and 87.8%, respectively.

It can be seen from the above-mentioned examples that the sarong belt has a significant removal effect on NH ₄ ⁺ —N, TN, TP, COD _cr in the biogas slurry of livestock and poultry breeding, and can be used for the treatment of biogas slurry of livestock and poultry breeding.

Claims (7)

1. the application of Leaf of Chinese Crinum in handling livestock and poultry cultivation natural pond liquid is characterized in that: in the environment that livestock and poultry cultivation natural pond liquid pollutes, plant Leaf of Chinese Crinum.

2. according to the said application of claim 1, it is characterized in that: Leaf of Chinese Crinum is planted in automatic oxygen supply artificial wet land system.

3. according to the said automatic oxygen supply artificial wet land system of claim 2, it is characterized in that: wetland bed body inside is made up of wetland filling substrate and shale hollow brick, and the hole through the shale hollow brick is to the automatic oxygen supply in wet land system inside.

4. according to the said automatic oxygen supply artificial wet land system of claim 2, it is characterized in that: filling substrate particle diameter and filling thickness all carried out artificial screening.

5. filling the thick particle diameter of 15cm in the wetland is the gravel bed of 10～20mm, and the thick particle diameter of 20cm is that 1～10mm slag layer and thickness are the sand layer of 15cm.

6. according to the said automatic oxygen supply artificial wet land system of claim 2; It is characterized in that: the wet land system water intake mode adopts intermittent loading; Utilize the period of not water inlet further to replenish the inner oxygen level of wet land system, thereby improve the inner oxygen delivery capacity automatically of wet land system.

7. according to the said application of claim 1, it is characterized in that: regularly gather in the crops the medicinal or sale of part Leaf of Chinese Crinum, in time remove Lao Ye and avoid secondary pollution.

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