Method for cultivating energy crop bamboo reed by using household garbage incineration fly ash washing liquid

Abstract

The invention relates to the technical field of harmless treatment of garbage, and discloses a method for cultivating energy crop bamboo reed by using household garbage incineration fly ash washing liquid, which comprises the following steps: washing household garbage incineration fly ash with deionized water for multiple times according to a solid-to-liquid ratio of 1: (10-15), filtering and collecting the fly ash washing liquid, and adjusting the pH value of the fly ash washing liquid to be neutral or weakly acidic; the fly ash washing liquid and tap water are mixed according to the volume ratio of 1: (20-40) to prepare a nutrient solution, and the nutrient solution is used for conducting water culture on the bamboo reed seedlings. According to the invention, the resource utilization of the fly ash washing liquid is realized, and the liquid which is traditionally treated as hazardous waste is converted into a high-added-value nutrient solution; the specific synergistic mechanism of potassium / calcium / magnesium ions in fly ash washing liquid and growth of the bamboo reeds is disclosed for the first time, the fly ash is washed with water and then mixed with tap water to prepare the hydroponic nutrient solution, compared with a conventional nutrient solution preparation process, a large amount of cost can be saved, traditional chemical fertilizers can be replaced, and the yield of the bamboo reeds is greatly increased.

Description

Technical Field

[0001] This invention relates to the field of waste harmless treatment technology, specifically to a method for cultivating the energy crop Reed (Phyllostachys edulis) using the washing liquid from fly ash from municipal solid waste incineration. Background Technology

[0002] Municipal solid waste incineration fly ash contains soluble salts, heavy metals, dioxins, and other toxic substances, posing a significant threat to the surrounding environment and human health, and is classified as hazardous waste. Currently, sanitary landfill is the primary method for disposing of waste incineration fly ash. While sanitary landfill technology is mature and cost-effective, it requires large amounts of land and is prone to leachate leakage and secondary pollutant generation. Therefore, the resource utilization of waste incineration fly ash is an important future research direction. To achieve resource utilization, treated municipal solid waste incineration fly ash can be used to produce building materials such as cement clinker, ceramic particles, and lightweight aggregates. The high chloride content of waste incineration fly ash negatively impacts its recycling, necessitating pretreatment before recycling.

[0003] Municipal solid waste incineration fly ash has a high chloride content, which can be dechlorinated through acid treatment, alkali treatment, heat treatment, and water washing. Compared with other methods, water washing is an effective, simple, low-cost, and relatively mature process. Fly ash washing liquid contains a large amount of chloride, and direct discharge would cause serious damage to the natural environment; therefore, chloride treatment is necessary before discharge. Chloride treatment in fly ash washing liquid mainly includes reverse osmosis, evaporation crystallization, and electrodialysis. Reverse osmosis can achieve highly efficient chloride removal, but it is not yet mature in treating industrial wastewater. Evaporation crystallization faces problems such as complex operation and high energy consumption, while electrodialysis technology uses alkali- and high-chloride-resistant bipolar membranes, resulting in high costs.

[0004] Therefore, researching a green, environmentally friendly, low-energy-consumption, and low-cost fly ash washing liquid treatment technology is of great value and significance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for cultivating the energy crop Reed ferruginosa using the fly ash washing liquid from municipal solid waste incineration. The growth of Reed ferruginosa can absorb a large amount of chloride salts from the fly ash washing liquid, thereby solving the problem of occupying large amounts of land resources and causing soil pollution caused by the current methods of treating municipal solid waste incineration fly ash, such as sanitary landfill. The cultivated Reed ferruginosa can be used as biomass energy, which has important environmental and energy benefits.

[0006] To achieve the above objectives, the present invention provides a method for cultivating the energy crop Reed rush using fly ash washing liquid from municipal solid waste incineration, comprising the following steps:

[0007] (1) Wash the fly ash from municipal solid waste incineration multiple times with deionized water at a solid-liquid ratio of 1:10-15. Stir the fly ash for 8-10 minutes each time until it is fully mixed and uniform. Let it stand for 10-15 minutes, filter and collect the fly ash washing liquid, and adjust the pH of the fly ash washing liquid to neutral or weakly acidic.

[0008] (2) Prepare a nutrient solution by mixing fly ash washing liquid with tap water at a volume ratio of 1:20-40, and use the nutrient solution to hydroponically cultivate the seedlings of Reed Bamboo.

[0009] As a further preferred technical solution of the present invention, in step (2), before hydroponically cultivating the Reed seedlings, they are selected in the following manner:

[0010] The roots containing young shoots of Reed are divided into sections, each with a fresh weight of 200-300g. The divided Reed roots are then hydroponically cultured in tap water for 15-20 days before being used for subsequent hydroponics.

[0011] As a further preferred technical solution of the present invention, in step (2), Phragmites australis seedlings with a height of 20-30cm are selected for hydroponics.

[0012] As a further preferred technical solution of the present invention, in step (1), the fly ash is washed twice with deionized water at a solid-liquid ratio of 1:15.

[0013] As a further preferred technical solution of the present invention, in step (1), an appropriate amount of acetic acid is added to the fly ash washing solution to make the pH value of the fly ash washing solution 6.5±0.5.

[0014] According to another aspect of the present invention, the present invention also provides a biological treatment process for chloride salts in the fly ash washing liquid of municipal solid waste incineration, which includes the following steps:

[0015] S1. Set up a pond for planting reeds and plant reeds;

[0016] S2. Wash the fly ash from municipal solid waste incineration multiple times with water (such as tap water, deionized water, etc.) at a solid-liquid ratio of 1:10-15. Stir the fly ash for 8-10 minutes each time until it is fully mixed and uniform. Let it stand for 10-15 minutes, filter and collect the fly ash washing liquid, add acetic acid to adjust the pH of the fly ash washing liquid to 6.5±0.5, and then mix the fly ash washing liquid with tap water at a volume ratio of 1:20-40 to prepare a nutrient solution.

[0017] S3. Pour the nutrient solution from step S2 into the Reed Planting Pond from step S1. After 3-4 weeks, drain the water and replenish with new nutrient solution.

[0018] As a further preferred technical solution of the present invention, in step S1, there are several Reed Planting Ponds, which are connected in series through a water supply and drainage system, so that the nutrient solution formed by fly ash washing liquid flows through each Reed Planting Pond in sequence, thereby treating chloride salts to the greatest extent and making the final drainage meet the national sewage discharge standards.

[0019] Compared with existing technologies, the following beneficial effects can be achieved:

[0020] 1. Resource recycling: Realize the resource utilization of fly ash washing liquid, transforming the liquid, which is traditionally treated as hazardous waste, into a high-value-added nutrient solution; For the first time, the specific synergistic mechanism between potassium / calcium / magnesium ions in fly ash washing liquid and the growth of Reed hyacinth is revealed. After washing the fly ash, it is mixed with tap water to prepare a hydroponic nutrient solution, which can save a lot of costs compared with conventional nutrient solution preparation processes, replace traditional chemical fertilizers, and significantly increase the yield of Reed hyacinth.

[0021] 2. Environmental benefits: Establishing a dynamic model of chloride migration and transformation enables precise control of process parameters, resulting in high chloride removal efficiency. While cultivating Reed ferox as an economic crop, it can completely solve the problem of chloride pollution in fly ash. The biomass accumulation rate of Reed ferox is faster than that of conventional hydroponics, significantly enhancing carbon sequestration capacity. The entire system can achieve zero wastewater discharge, forming a completely closed-loop cycle and constructing an innovative industrial closed loop of "solid waste treatment - plant cultivation - energy conversion".

[0022] 3. Economic benefits: This invention uses the fly ash washing liquid from municipal solid waste incineration to prepare nutrient solution for cultivating the energy crop Reed hyacinth. After harvesting, Reed hyacinth can be processed into solid, liquid and gaseous green fuels, which is conducive to promoting the development of new energy technologies. Attached Figure Description

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] Figure 1 Photo of hydroponically grown Reed (starting hydroponics).

[0025] Figure 2 Photo of hydroponically grown reeds (4 weeks later).

[0026] Figure 3 Photo of planting Reed hyacinth to improve soil with fly ash (planting begins).

[0027] Figure 4 Photo of Reed Root planted in fly ash-improved soil (4 weeks later).

[0028] Figure 5 Photo of hydroponically grown rice (starting hydroponics).

[0029] Figure 6 Photo of hydroponically grown rice (4 weeks later).

[0030] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0032] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art to which this invention pertains. Unless otherwise specified, the experimental reagents used in the following embodiments are conventional biochemical reagents; and the experimental methods described are conventional methods.

[0033] The composition of the fly ash from waste incineration used in the following experiments is shown in Table 1:

[0034] Table 1

[0035]

[0036]

[0037] As shown in Table 1, fly ash mainly contains CaO, Na2O, K2O, SiO2, Cl, S, and heavy metals such as Zn, Pb, Cu, Hg, Cd, Cr, and As.

[0038] Example 1:

[0039] This embodiment provides a method for cultivating the energy crop Reed Pistacia chinensis using fly ash washing liquid from municipal solid waste incineration, and the testing of the treatment effect of the fly ash washing liquid during the cultivation process, as detailed below:

[0040] (1) Divide the roots containing young shoots of Reed Root into sections. Each section of Reed Root weighs 200-300g fresh. Soak the divided Reed Roots in tap water for 15 days to cultivate seedlings. Select healthy Reed Root seedlings with a height of 20-30cm for later use.

[0041] (2) The fly ash from the waste incineration in Table 1 was washed twice with deionized water at a solid-liquid ratio of 1:15. Each time, the fly ash was stirred for 10 minutes until it was fully mixed and then allowed to stand for 15 minutes. The fly ash washing liquid was then filtered and collected. The composition is shown in Table 2. The fly ash washing liquid is alkaline. An appropriate amount of acetic acid was added to make the pH value of the fly ash washing liquid 6.5.

[0042] (3) The fly ash washing liquid and tap water were mixed at a volume ratio of 1:10 to prepare nutrient solution A. The concentrations of calcium ions in nutrient solution A were measured to be 281.83 mg / L, sodium ions 197.20 mg / L, potassium ions 144.37 mg / L, chloride ions 548.63 mg / L, sulfur ions 83.10 mg / L, and magnesium ions 9.17 mg / L. The EC value of nutrient solution A was 3.06 mS / cm. Nutrient solution A was poured into a water bucket for hydroponic cultivation of Reed Stupa.

[0043] The device used for hydroponics is a 5L graduated plastic bucket. In order to facilitate the measurement of the decrease and magnitude of various ions during the cultivation process, deionized water is added in a timely manner to maintain the water level.

[0044] (4) Record the growth status of Reed regularly and measure growth indicators such as Reed height, height increment, maximum leaf length, maximum leaf width, leaf area (obtained by summing the product of the length and maximum width of each leaf), and leaf area increment.

[0045] Table 2

[0046] Element Content / (mg / L) heavy metal Content / (mg / L) Ca 2442.53 As 0.13 Na 1618.56 Cd — K 1547.24 Cr — Cl 5142.20 Cu 0.22 S 467.80 Hg 0.03 Mg 0.43 Ni — Si 1.79 Pb 4.89 P 0.77 Zn 2.08

[0047] As shown in Table 2, the contents of Ca, Na, K, Cl, and S ions in the fly ash washing solution are still relatively large, while the heavy metal content is relatively low. This is because the heavy metals leached from the fly ash are diluted with water in a certain proportion, which further reduces the heavy metal content.

[0048] Example 2:

[0049] This embodiment is based on Embodiment 1, and the only difference from Embodiment 1 is that in step (3), fly ash washing liquid and tap water are mixed at a volume ratio of 1:20 to prepare nutrient solution B. The concentration of calcium ions in nutrient solution B is 175.23 mg / L, sodium ions is 136.06 mg / L, potassium ions is 83.16 mg / L, chloride ions is 322.06 mg / L, sulfur ions is 59.83 mg / L, and magnesium ions is 9.84 mg / L. The EC value of nutrient solution B is 2.07 mS / cm. Nutrient solution B is poured into a water bucket for hydroponic cultivation of reeds.

[0050] Example 3:

[0051] This embodiment is based on embodiment 1, and the only difference from embodiment 1 is that in step (3), fly ash washing liquid and tap water are mixed at a volume ratio of 1:40 to prepare nutrient solution C. The concentration of calcium ions in nutrient solution C is 124.16 mg / L, sodium ions is 107.68 mg / L, potassium ions is 53.06 mg / L, chloride ions is 197.57 mg / L, sulfur ions is 48.46 mg / L, magnesium ions is 10.52 mg / L, and the EC value of nutrient solution C is 1.47 mS / cm. Nutrient solution C is poured into a water bucket for hydroponic cultivation of reed.

[0052] Example 4:

[0053] This embodiment is based on embodiment 1, and the only difference from embodiment 1 is that in step (3), fly ash washing liquid and tap water are mixed at a volume ratio of 1:80 to prepare nutrient solution D. The concentration of calcium ions in nutrient solution D is 72.86 mg / L, sodium ions is 76.61 mg / L, potassium ions is 24.39 mg / L, chloride ions is 136.10 mg / L, sulfur ions is 40.28 mg / L, and magnesium ions is 10.58 mg / L. The EC value of nutrient solution D is 0.98 mS / cm. Nutrient solution D is poured into a water bucket for hydroponic cultivation of reeds.

[0054] Comparative Example 1:

[0055] As a control experiment for Example 1, tap water free of fly ash washing liquid was used for hydroponic cultivation of Reed hyacinth, as detailed below:

[0056] (1) Divide the roots containing young shoots of Reed Root into sections. Each section of Reed Root weighs 200-300g fresh. Soak the divided Reed Roots in tap water for 15 days to cultivate seedlings. Select healthy Reed Root seedlings with a height of 20-30cm for later use.

[0057] (2) Tap water was used as the nutrient solution and poured into a water bucket for hydroponic cultivation of Reed. The concentrations of calcium ions in the tap water were measured to be 44.52 mg / L, sodium ions 60.09 mg / L, potassium ions 6.71 mg / L, chloride ions 48.52 mg / L, sulfur ions 32.04 mg / L, and magnesium ions 10.65 mg / L. The EC value of the nutrient solution B was 0.62 mS / cm.

[0058] The device used for hydroponics is a 5L graduated plastic bucket. In order to facilitate the measurement of the decrease and magnitude of various ions during the cultivation process, deionized water is added in a timely manner to maintain the water level.

[0059] (3) Record the growth status of Reed regularly and measure growth indicators such as Reed height, height increment, maximum leaf length, maximum leaf width, leaf area (obtained by summing the product of the length and maximum width of each leaf), and leaf area increment.

[0060] Comparative Example 1 was mainly used to compare the effects of adding and not adding fly ash washing solution to tap water on the growth of Reed Bamboo.

[0061] Comparative Example 2:

[0062] As a control experiment for Example 1, soil was improved using fly ash from waste incineration for the cultivation of Reed Bamboo Shoots, as detailed below:

[0063] (1) Divide the roots containing young shoots of Reed Root into sections. Each section of Reed Root weighs 200-300g fresh. Soak the divided Reed Roots in tap water for 15 days to cultivate seedlings. Select healthy Reed Root seedlings with a height of 20-30cm for later use.

[0064] (2) The proportion of fly ash added from waste incineration is 2%. Flower pots are used for cultivation and watering is done regularly. The specifications of the flower pot are 21 cm in top diameter, 15 cm in bottom diameter, 20 cm in height, and 4.5 L in capacity.

[0065] (3) Record the growth status of Reed regularly and measure growth indicators such as Reed height, height increment, maximum leaf length, maximum leaf width, leaf area (obtained by summing the product of the length and maximum width of each leaf), and leaf area increment.

[0066] Comparative Example 2 is mainly to illustrate that hydroponic cultivation of Reed Bamboo using fly ash washing solution is more effective than cultivation of Reed Bamboo using fly ash soil.

[0067] Comparative Example 3:

[0068] This comparative example is based on Example 1, and the only difference from Example 1 is that the hydroponic object, the Reed Piper longifolia seedlings, is replaced with rice seedlings with a height of 20-30 cm for hydroponics.

[0069] Comparative Example 4:

[0070] This comparative example is based on Example 2, and the only difference from Example 1 is that the hydroponic object, the Reed Piper longifolia seedlings, is replaced with rice seedlings with a height of 20-30 cm for hydroponics.

[0071] Comparative Example 5:

[0072] This comparative example is based on Example 3, and the only difference from Example 1 is that the hydroponic object, the Reed Piper longifolia seedlings, is replaced with rice seedlings with a height of 20-30 cm for hydroponics.

[0073] Comparative Example 6:

[0074] This comparative example is based on Example 4, and the only difference from Example 1 is that the hydroponic object, the Reed Piper longifolia seedlings, is replaced with rice seedlings with a height of 20-30 cm for hydroponics.

[0075] Comparative Example 7:

[0076] This comparative example is based on Comparative Example 1, and uses tap water without fly ash washing liquid to hydroponically cultivate rice. The only difference from Comparative Example 1 is that the hydroponic object, the reed seedlings, is replaced with rice seedlings with a height of 20-30 cm.

[0077] Examples 1-4 and Comparative Examples 1-6 were conducted simultaneously, and the specific experimental tests are as follows:

[0078] On April 12, 2025, Reed and rice were cultivated. After 4 weeks of cultivation, growth indicators such as height, height increase, maximum leaf length, maximum leaf width, leaf area (obtained by summing the products of the length and maximum width of each leaf), and leaf area increase were measured for Examples 1-4 and Comparative Examples 1-7. Three sets of parallel experiments were conducted for each example and comparative example. The results are shown in Table 3.

[0079] Table 3

[0080]

[0081] Table 3 shows that the overall growth of *Arundinaria mirifica* in the examples was better than that of the *Arundinaria mirifica* and rice in the control group. Rice cultured with the fly ash washing liquid from municipal solid waste incineration showed yellowing and failed to grow normally. Among the examples, *Arundinaria mirifica* in Examples 2 and 3 showed the best growth and development, followed by Example 5, while *Arundinaria mirifica* in Example 1 showed the worst growth and development. This indicates that hydroponic cultivation of *Arundinaria mirifica* with fly ash washing liquid from municipal solid waste incineration is feasible, but the nutrient solution concentration should be controlled within a reasonable range.

[0082] Figure 1 , Figure 2 The photos show the Reed stalks in Examples 1-4 and Comparative Example 1 at the beginning of hydroponics and after 4 weeks of hydroponics, illustrating that the Reed stalks in Examples 1-4 and Comparative Example 1 can grow normally. The order of Reed stalk growth indicators from strong to weak is Example 3, Example 2, Example 4, Comparative Example 1, and Example 1.

[0083] Figure 3 , Figure 4 The photos show the growth rate of Reed hyacinth in fly ash-improved soil at the beginning of planting and Reed hyacinth 4 weeks after planting, which demonstrate that the growth rate of Reed hyacinth in fly ash-improved soil is significantly lower than that in fly ash-washed nutrient solution. Fly ash-washed nutrient solution has a clear advantage for hydroponic Reed hyacinth cultivation.

[0084] Figure 5 , Figure 6 The photos of the rice in Examples 3-7 at the beginning of hydroponics and after 4 weeks of hydroponics show that the rice cannot grow normally in the fly ash washed nutrient solution and turns yellow. The growth indicators of the rice are significantly worse than those of reed, indicating that the fly ash washed nutrient solution is not suitable for rice cultivation.

[0085] On April 12, 2025, fly ash water was used to wash the nutrient solution for hydroponic cultivation of Reed ferox. During the hydroponic process, deionized water was added weekly to maintain a constant nutrient solution level. After 4 weeks of hydroponic cultivation, the concentrations of various ions in the nutrient solution were measured, and the results are shown in Table 4.

[0086] Table 4

[0087]

[0088] After 4 weeks of hydroponic cultivation of Reed ferns, the decrease in the concentration and percentage of each ion in the nutrient solution are shown in Tables 5 and 6, respectively.

[0089] Table 5

[0090]

[0091]

[0092] Table 6

[0093]

[0094] Data from Tables 5 and 6 show that as the concentration of the fly ash washing nutrient solution increases, the absorption of calcium, sodium, potassium, chloride, and sulfur ions from the fly ash washing nutrient solution by *Arundinaria rapa* increases, while the absorption of magnesium ions decreases. However, excessively high nutrient solution concentrations have a certain inhibitory effect on the growth of *Arundinaria rapa*. In Example 1, the order of absorption of each ion by *Arundinaria rapa* from largest to smallest is calcium, chloride, potassium, sodium, sulfur, and magnesium; in Examples 2 and 3, the order of absorption of each ion by *Arundinaria rapa* from largest to smallest is chloride, potassium, calcium, sodium, sulfur, and magnesium; in Example 4, the order of absorption of each ion from largest to smallest is chloride, sodium, potassium, calcium, sulfur, and magnesium; and in Comparative Example 1, the order of absorption of each ion by *Arundinaria rapa* from largest to smallest is chloride, sodium, sulfur, potassium, magnesium, and calcium.

[0095] Compared to other examples, *Arundinaria mirifica* showed a higher calcium ion absorption in Example 1, mainly due to the higher calcium ion concentration in the fly ash washing nutrient solution. In Examples 4 and Comparative Example 1, *Arundinaria mirifica* absorbed more sodium ions than potassium ions, primarily because the potassium ion concentration in the fly ash washing nutrient solution was lower, failing to provide a continuous supply of potassium ions. Overall, *Arundinaria mirifica* showed a higher chloride ion absorption in all examples, reflecting its good absorption effect of chloride salts in the fly ash washing solution.

[0096] The low concentration of heavy metal ions in the fly ash-washed nutrient solution in each embodiment is mainly due to the reduced concentration after the fly ash washing solution is diluted with tap water, and the absorption of trace amounts of remaining heavy metal ions from the fly ash-washed nutrient solution during the growth of Arundo donax. Compared to before hydroponics, the concentration of heavy metal ions has further decreased. In the above embodiments, the concentrations of heavy metal ions such as lead, mercury, chromium, cadmium, and arsenic in the fly ash-washed nutrient solution after 4 weeks of cultivation of Arundo donax in each embodiment are ≤0.01 mg / L, which does not exceed the wastewater discharge standards and can be directly discharged.

[0097] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and various changes or modifications can be made to these embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is defined only by the appended claims.

Claims

1. A method for cultivating the energy crop *Arundinaria lobata* using fly ash washings from municipal solid waste incineration, characterized in that... Includes the following steps: (1) Wash the fly ash from municipal solid waste incineration multiple times with deionized water at a solid-liquid ratio of 1:10-15. Each time, stir the fly ash until it is fully mixed and uniform, let it stand, filter and collect the fly ash washing liquid, and adjust the pH of the fly ash washing liquid to neutral or weakly acidic. (2) Prepare a nutrient solution by mixing fly ash washing liquid with tap water at a volume ratio of 1:20-40, and use the nutrient solution to hydroponically cultivate the seedlings of Reed Bamboo.

2. The method for cultivating the energy crop *Arundinaria lobata* using fly ash washing liquid from municipal solid waste incineration according to claim 1, characterized in that, In step (2), before hydroponically cultivating the Reed seedlings, they should be selected as follows: The roots containing young shoots of Reed are divided into sections, each with a fresh weight of 200-300g. The divided Reed roots are then hydroponically cultured in tap water for 15-20 days before being used for subsequent hydroponics.

3. The method for cultivating the energy crop *Arundinaria lobata* using fly ash washing liquid from municipal solid waste incineration according to claim 1, characterized in that... In step (2), select Reed seedlings with a height of 20-30cm for hydroponics.

4. The method for cultivating the energy crop *Arundinaria lobata* using fly ash washing liquid from municipal solid waste incineration according to claim 1, characterized in that... In step (1), the fly ash is washed twice with deionized water at a solid-liquid ratio of 1:

15.

5. The method for cultivating the energy crop *Arundinaria lobata* using fly ash washing liquid from municipal solid waste incineration according to claim 1, characterized in that... In step (1), an appropriate amount of acetic acid is added to the fly ash washing solution to make the pH value of the fly ash washing solution 6.5±0.

5.

6. A biological treatment process for chloride salts in the fly ash washing liquid from municipal solid waste incineration using *Arundinaria lobata*, characterized in that, Includes the following steps: S1. Set up a pond for planting reeds and plant reeds; S2. Wash the fly ash from municipal solid waste incineration multiple times with water at a solid-liquid ratio of 1:10 to 15. Each time, stir the fly ash until it is fully mixed and uniform, let it stand, filter and collect the fly ash washing liquid, add acetic acid to adjust the pH of the fly ash washing liquid to neutral or weakly acidic, and then mix the fly ash washing liquid with tap water at a volume ratio of 1:20 to 40 to prepare a nutrient solution. S3. Pour the nutrient solution from step S2 into the Reed Planting Pond from step S1. After 3-4 weeks, drain the water and replenish with new nutrient solution.

7. The *Arundinaria lobata* biological treatment process for chloride salts in the fly ash washing liquid from municipal solid waste incineration according to claim 6, characterized in that... In step S1, there are several reed planting ponds, which are connected in series through a water supply and drainage system.

Images