TWI477456B - Water treatment method - Google Patents

Description

Water treatment method

The present invention relates to a water treatment technique, and more particularly to a water treatment method.

According to statistics from the Food and Agriculture Organization of the United Nations (FAO) in 2009, the global production of capture fisheries and aquaculture fisheries is approximately 145.1 million metric tons. Among them, marine fishery production is about 90 million metric tons, accounting for 62% of global production; aquaculture fishery production is about 55.1 million metric tons, accounting for 38% of global production. In addition, world capture fisheries production has been relatively stable over the past 10 years, and aquaculture fishery production has grown by about 8% per year since 1970. It is obvious that under the maturity of farming technology, the use of artificial farming forms similar to the agricultural and livestock industry has become one of the main sources of aquatic products.

Reviewing the development of aquaculture and fisheries in the past 40 years in Taiwan, from the "Salmon Kingdom", "Shrimp Kingdom", "Animal Fish Kingdom" to "Wu Guoyu Kingdom", "Landscape Kingdom" and the recent "Sea Fish Kingdom" Constantly creating amazing miracles. However, behind the miracle, it faces enormous challenges. Due to factors such as aquaculture management disorder, water quality and environmental pollution, ecological environment damage, competition in foreign markets, increased breeding costs, and imbalances in production and marketing, the development of China's aquaculture fisheries has stagnated.

In order to solve the above problems, although the domestic industry and academia have actively adopted various strategies or methods, there is still much room for improvement. Among them, there are some aspects of water pollution and environmental pollution, which have not received much attention so far, so this issue is particularly urgent to improve.

In aquaculture, common toxic substances are hydrogen sulfide, ammonia nitrogen and nitrite in descending order of toxicity. Among them, the toxicity of nitrite is far weaker than that of ammonia nitrogen. In addition, in the general aquaculture water environment, the concentration of hydrogen sulfide is often much lower than that of ammonia nitrogen, and it is easy to change chemically into non-toxic products, so it is less a source of toxicity in aquaculture. Therefore, ammonia is the most threatening in aquaculture.

In general, when the concentration of ammonia nitrogen in water is 1~2 mg/L, it is likely to be toxic to aquaculture targets (such as fish or shrimp). Therefore, many techniques have been adopted to increase the dissolved oxygen in water to convert ammonia nitrogen into less toxic nitrate nitrogen by nitrification.

However, high concentrations of nitrate nitrogen in outdoor farms contribute to the proliferation of algae. Excess algae often lead to deterioration of water quality and even death of aquaculture targets. To reduce losses, breeders have to use potions to control water quality. Although this will increase production, it will also reduce the quality and market price of aquaculture targets.

Therefore, an aspect of the present invention is to provide a water treatment method which mainly utilizes a submerged aquatic plant purification tank to treat treated water to reduce algae in the water to be treated, and before the submerged aquatic plant purification tank, The treatment water is treated by the deoxidation tank to enhance the effect of the submerged aquatic plant purification tank to reduce the algae in the water to be treated. In this way, the water treatment method can reduce the concentration of algae in the water to be treated without using chemicals.

According to the above object of the present invention, a water treatment method is proposed. This water treatment method is suitable for purifying a water to be treated. The water treatment method mainly comprises a first treatment step of treating the treated water with a deoxidation tank, wherein a porous filter material is arranged inside the deoxidation tank, and a cover plate is arranged on the top of the deoxidation tank. After the first processing step, a second processing step is performed on the treated water by using a submerged aquatic plant purification tank, wherein the submerged aquatic plant purification tank is provided with a porous filter layer and at least a first aquatic plant.

According to an embodiment of the invention, the deoxidizing tank comprises a floating plate, and the floating plate suspends at least one porous filter material.

According to an embodiment of the invention, the cover plate comprises a first heat shield.

According to an embodiment of the invention, the porous filter material comprises a contact filter, a flow biocontact filter, a honeycomb type cross-wave contact filter, a floating biofilter or a combination thereof.

According to an embodiment of the invention, the porous filter layer comprises gravel, waste tire chips, slag, fly ash, river sand, anthracite, activated carbon, waste concrete blocks, marble, waste bricks or combinations thereof.

According to an embodiment of the present invention, the water treatment method is further included before the first processing step, using a free surface flow type aquatic plant purification tank to perform a pretreatment step on the treated water, wherein the free surface flow type aquatic plant A soil layer and at least one second aquatic plant are disposed inside the purification tank.

According to an embodiment of the present invention, the deoxidation tank and the submerged aquatic plant purification tank are connected by a first connecting water pipe, and the deoxidizing tank and the free surface flowing aquatic plant purification tank are separated by a The second connecting water pipe is in communication, wherein the outlet end of the second connecting water pipe is higher than the inlet end of the first connecting water pipe.

According to an embodiment of the present invention, the water treatment method further comprises: before the preceding processing step, using a front aeration tank to treat the treated water for another pre-treatment step, wherein the first aeration tank is provided with a first diffusion gas. a disk, and the first air diffuser is in communication with a first air compression pump.

According to an embodiment of the invention, the top of the previous aeration tank is covered with a visor.

According to an embodiment of the present invention, the water treatment method further comprises: after the second processing step, performing a third processing step on the treated water by using a rear aeration tank, wherein the second aeration tank is provided with a second The air disc is connected, and the second air disc is in communication with a second air compression pump.

Please refer to FIG. 1 and FIG. 2 , which are respectively a schematic diagram of a system architecture of a water treatment system and a flow chart of a water treatment method according to an embodiment of the present invention. In the present embodiment, the water treatment method 200 can be performed in the water treatment system 100. This water treatment method 200 can be applied to aquaculture, industrial wastewater treatment or domestic wastewater treatment. If the water treatment method 200 is used in aquaculture, the water to be treated is the water in the culture pond.

As shown in FIG. 1, in one embodiment, the water treatment system 100 primarily includes a deoxygenation tank 110 and a submersible aquatic plant purification tank 120. The submerged aquatic plant purification tank 120 is connected to the deoxidation tank 110 through the connection water pipe 130 to receive the water to be treated from the deoxidation tank 110.

In one embodiment, when the water treatment method 200 is performed, the first treatment step 210 may be performed on the treated water using the deoxidation tank 110 of the water treatment system 100. A porous filter 112 is disposed inside the deoxidizing tank 110. In some embodiments, the porous filter material 112 can be a contact filter with a total surface area of 280 m ² /m ³ and a void ratio greater than 99%, a flowable biological contact filter having a total surface area of 800 m ² /m ³ , voids 98.7% of the honeycomb type cross-wave contact type filter material, floating biological filter material with a void ratio of 91 to 97% or various combinations of the foregoing various materials. Because the porous filter material 112 has a large overall surface area and a high void ratio, it is well suited for providing microbial epidemics to the water to be treated. In this way, the amount of microorganisms in the water to be treated can be increased to facilitate the consumption of dissolved oxygen in the water to be treated by the microorganisms. Therefore, the amount of dissolved oxygen of the water to be treated flowing through the deoxidizing tank 110 can be reduced.

As shown in FIG. 1, in an embodiment, the interior of the deoxidizing tank 110 is more selectively provided with a floating plate 114. Since the water to be treated enters the deoxidizing tank 110, the floating plate 114 floats on the water surface. Therefore, the floating plate 114 can be used to hang the porous filter material 112, and can block the air on the water surface, so that the air oxygen in the air is less likely to dissolve into the water. Although the porous filter material 112 can also be hung by a fixing bracket (not shown), if it is hung by a fixed bracket, the effect of blocking air cannot be achieved.

Further, as shown in FIG. 1, in an embodiment, the top portion of the deoxidizing tank 110 may also selectively cover the cover plate 116. Thereby, the barrier of the cover plate 116 makes it difficult for air to enter the deoxidation tank 110, and at the same time, the oxygen in the air is not easily dissolved into the water. In one embodiment, the cover plate 116 can be, for example, a one-piece insulation panel or only partially insulated. In this way, the cover plate 116 including the heat insulating structure can block sunlight in addition to blocking air. Therefore, if the water treatment system 100 is installed outdoors, the cover plate 116 including the heat insulation structure can be used to block the exposure of the sunlight, so that the temperature of the water in the deoxidation tank 110 is not excessively high. In addition, the cover plate 116 including the heat insulating structure can also make algae difficult to perform photosynthesis, thereby inhibiting algae growth.

Next, as shown in FIGS. 1 and 2, the second treatment step 220 is performed on the treated water by the submerged flow aquatic plant purification tank 120 of the water treatment system 100. The submerged aquatic plant purification tank 120 is internally provided with a porous filter layer 122 and at least a first aquatic plant 124. The porous filter material layer 122 may comprise gravel having an average particle diameter of 1.0 to 10.0 cm and a porosity of 0.35 to 0.60, and may also include waste tire slicing, slag, fly ash, river sand, anthracite, activated carbon, waste concrete block, marble, waste. Bricks or various combinations of the various materials described above. This porous filter layer 122 is available for first aquatic plants 124 to grow. The first aquatic plant 124 can be dominated by aqueous aquatic plants such as reed, cattail, rush or coin grass. The first aquatic plant 124 can also shield the sunlight by removing the nutrient salt or heavy metal in the water to be treated by ingestion, thereby facilitating the creation of an environment suitable for denitrifying bacteria for denitrification.

In addition, roots, stems or leaves of the first aquatic plant 124 may also form a humic layer (not shown) in the porous filter layer 122. The humus layer can produce ion exchange or redox to remove nutrients such as nitrite nitrogen, nitrate nitrogen and phosphate. Moreover, the humus layer in the porous filter layer 122 can also create an anaerobic environment, which can facilitate the denitrification of the denitrifying bacteria, thereby reducing the nitrate nitrogen in the water to be treated.

Briefly, the submerged aquatic plant purification tank 120 creates an environment suitable for denitrification, ion exchange or redox, thereby reducing nutrient salts such as nitrite nitrogen, nitrate nitrogen, and phosphate. In addition, too much nutrients such as nitrite nitrogen, nitrate nitrogen and phosphate in water are important causes of excessive algae in the water. Therefore, algae in the water to be treated can be reduced by denitration, ion exchange or redox in the submerged aquatic plant purification tank 120. On the other hand, since the deoxidizing tank 110 can reduce the amount of dissolved oxygen in the water to be treated, the biochemical action performed in the submerged aquatic plant purification tank 120 can be enhanced. The aforementioned biochemical effects mainly refer to denitrification, but there are also other microorganisms' metabolism. Certain metabolic processes of microorganisms can also remove contaminants.

That is, the water treatment method 200 mainly utilizes the submerged aquatic plant purification tank 120, and the second treatment step 220 is performed to reduce the algae in the water to be treated, and the deoxidation tank 110 is utilized before the second treatment step 220. The treated water is subjected to a first processing step 210 to enhance the effect of reducing algae in the water to be treated in the second processing step 220.

Referring again to Figures 1 and 2, the water treatment system 100 more selectively includes a free surface flow aquatic plant purification tank 140, depending on the application requirements. The free surface flow type aquatic plant purification tank 140 can communicate with the deoxidation tank 110 through the connection water pipe 150, and the water to be treated is transferred from the free surface flow type aquatic plant purification tank 140 to the deoxidation tank 110. Thus, in another embodiment, the water treatment method 200 may further perform a pre-treatment step 230 on the treated water using the free surface flowable aquatic plant purification tank 140 prior to the first processing step 210.

As shown in FIG. 1, the free surface flow type aquatic plant purification tank 140 is internally provided with a soil layer 142 and at least a second aquatic plant 144. Among them, the soil layer 142 can be planted by the second aquatic plants 144. Since the soil layer 142 is a fixed substance with a high surface area, and the nitrifying bacteria are in the process of reproduction, there is a tendency to adhere to the appearance of the fixed object. Therefore, the soil layer 142 can also facilitate the attachment of nitrifying bacteria, thereby effectively increasing the proliferation of nitrifying bacteria. Since the nitrifying bacteria are subjected to nitrification, the ammonia nitrogen in the water to be treated can be removed. Therefore, a soil layer 142 is provided in the free surface flow type aquatic plant purification tank 140, mainly to provide an environment suitable for the proliferation of nitrifying bacteria, thereby facilitating the reduction of ammonia nitrogen by nitrification. The aforementioned nitrifying bacteria mainly include microorganisms such as Nitrosomonas and Nitrobacter.

In the free surface flow type aquatic plant purification tank 140, the uptake of the second aquatic plant 144 can reduce nutrient salts and heavy metals in the water to be treated. In some embodiments, the second aquatic plant 144 can comprise at least one aqueous aquatic plant and/or at least one floating aquatic plant. Among them, the water-borne aquatic plants can be, for example, reed, rush, cattail, pennisetum, windmill grass or pelt. The water-borne aquatic plants mainly transmit a small amount of oxygen to the soil layer 142 at the bottom of the free surface flow type aquatic plant purification tank 140, and locally strengthen the nitrification, but the remaining area of the soil layer 142 is still in an anaerobic state. It is beneficial for denitrification. As for the floating aquatic plants, for example, it is a bag lotus, a water hibiscus or a duckweed. The floating aquatic plants mainly have a better shielding effect on sunlight, and thus have better effects on the inhibition of algae and the improvement of nitrification efficiency.

In addition, the rhizome or soil at the bottom of the second aquatic plant 144 can also reduce the organic matter or nitrogenous pollutants in the water to be treated by mineralization, nitrification, denitrification and assimilation of organic matter, and can also reduce microorganisms in water. . Among them, the effect of reducing organic matter or nitrogen-containing contaminants is mainly achieved by microorganisms attached to the rhizome or soil of the second aquatic plant 144. Although microbes in a suspended state can achieve this effect, the contribution of suspended microorganisms is relatively low. The reduction of the efficacy of the microorganism is achieved by the action of precipitation, adsorption, etc. of the root system of the second aquatic plant 144.

In addition, in the pre-treatment step 230, the suspended solids, nutrient salts and microorganisms in the water to be treated can also be reduced by mechanisms such as physical sedimentation, adsorption or filtration in the free surface flow type plant purification tank 140. At the same time, it can also reduce the pathogens by the radiation of sunlight and the predation of protozoa.

Referring again to FIGS. 1 and 2, the water treatment system 100 can optionally include the front aeration tank 160 according to actual needs. The front aeration tank 160 can communicate with the free surface flow type aquatic plant purification tank 140 through the connection water pipe 170, and the water to be treated is transferred from the front aeration tank 160 to the free surface flow type aquatic plant purification tank 140. Thus, in yet another embodiment, the water treatment method 100 may perform another pre-treatment step 240 with the pre-aeration tank 160 to treat the water prior to the pre-treatment step 230.

As shown in FIG. 1, a diffuser disk 162 is disposed inside the front aeration tank 160, and the diffuser disk 162 is in communication with the air compression pump 164. Thus, the air compression pump 164 can supply air to the air diffusing disk 162, and the air diffusing disk 162 can be used to manufacture minute air bubbles to increase the contact area between the air and the water to be treated, thereby increasing the dissolution of the water to be treated. Oxygen content. In this way, the nitrification performed in the free surface flow type aquatic plant purification tank 140 can be enhanced, thereby enhancing nitrification and thereby improving the effect of reducing the ammonia nitrogen concentration. In addition to this, the effect of removing suspended solids in the free surface flow type aquatic plant purification tank 140 can be enhanced by gas floating action.

It is worth mentioning that Ulken pointed out in 1963 that at 25 ° C, the oxygen uptake rate of nitrite in the dark is 1.22 times that of 4000 Lux, and that of nitrate bacteria is 1.5 times. In addition, Hooper & Terry also believed that the reaction rate of nitrification in the dark was high in 1973, and the activity of nitric acid was significantly inhibited when the light was stronger than 200 watt (420 Lux). Therefore, in order to enhance the nitrification, as shown in FIG. 1, in an embodiment, a visor 166 for shielding sunlight may be disposed on the top of the front aeration tank 160. In one embodiment, the visor 166 can be, for example, a one-piece insulating panel or only partially insulated. In this way, the light shielding plate 166 including the heat insulating structure can also prevent the water temperature of the water to be treated in the front exposure tank 160 from being excessively high. On the other hand, the denitrifying bacteria or the nitrifying bacteria mentioned in the present embodiment are naturally present in the water to be treated, and need not be additionally added.

In addition, in an embodiment, the front aeration tank 160 may further include a water inlet pipe 167 and a submersible motor 168. The water to be treated is pumped to the front aeration tank 160 through the inlet pipe 167 and the outlet end of the submersible motor 168.

Referring again to FIGS. 1 and 2, the water treatment system 100 more preferably includes a rear aeration tank 180. The aeration tank 180 can communicate with the submerged aquatic plant purification tank 120 through the connecting water pipe 182 to receive the water to be treated from the submerged aquatic plant purification tank 120. Therefore, in a further embodiment, the water treatment method 200 can further perform the third processing step 250 on the treated water using the post-aeration tank 180 after the second processing step 220.

Thereafter, an aeration disc 184 may be disposed inside the aeration tank 180, and the diffuser disc 184 is in communication with the air compression pump 186. In this way, air is supplied to the air diffusing plate 184 by the air compression pump 186, thereby increasing the amount of dissolved oxygen in the water to be treated. Therefore, if the water treatment method 200 is applied to the aquaculture industry, the amount of dissolved oxygen in the culture pond can be adjusted by the third treatment step 250 to meet the needs of aquaculture. In addition, after the water to be treated passes through the third treatment step 250, it becomes the treated water.

In other embodiments, as shown in FIG. 1, the water treatment system 100 further includes a water level control tank 190. The water level control tank 190 can receive the treated water from the rear aeration tank 180 through the through holes 192. In the water treatment system 100, the position of the through hole 192 in which the rear aeration tank 180 communicates with the water level control tank 190 is lower than the outlet end of the water tube 182, and the outlet 194 of the water level control tank 190 is higher than the through hole 192. In this way, the water levels of the submerged aquatic plant purification tank 120, the deoxidation tank 110, the free surface flow type aquatic plant purification tank 140, and the front aeration tank 160 can be controlled to be approximately the same as the outlet 194 of the water level control tank 190. The height of the tank can be such that the water level of each of the aforementioned tanks is not too low, so that the water level is too low to prevent the microorganisms of the first aquatic plant 124, the second aquatic plant 144 or the water to be treated from dying. Further, since the position of the through hole 192 is lower than the outlet end of the water pipe 182, the phenomenon of short flow can be avoided. In addition, as shown in FIG. 1, in an embodiment, the outlet 194 of the water level control tank 190 is provided with an outlet pipe 196, and the outlet pipe 196 is provided with a valve 198. In this way, by adjusting the opening degree of the valve 198, the water level in the water level control tank 190 can be finely adjusted, so that the water level of each of the above slots can be finely adjusted.

It is worth mentioning that, as shown in Fig. 1, in order to avoid the problem that short water flows in the free surface flow type aquatic plant purification tank 140, the deoxidation tank 110 or the submerged aquatic plant purification tank 120, the water to be treated may be avoided. The aforementioned short-flow problem will affect the effectiveness of each of the aforementioned slots. Therefore, in some embodiments, the outlet end of the connecting water pipe 170 is lower than the inlet end of the connecting water pipe 150; the outlet end of the connecting water pipe 150 is higher than the inlet end of the connecting water pipe 130; and the outlet end of the connecting water pipe 130 is lower than The inlet end of the water pipe 182 is joined.

On the other hand, as shown in FIG. 1, in some embodiments, the bottom of the front aeration tank 160, the deoxidizing tank 110 or the rear aeration tank 180 may be of an inverted ladder type. As a result, it will help to collect suspended solids in the water to be treated.

Furthermore, in order to facilitate the discharge of the soil collected at the bottom of each of the grooves, as shown in FIG. 1 , in some embodiments, the front aeration tank 160, the deoxidation tank 110 and the rear aeration tank 180 may be respectively provided. The drain pipe, that is, the drain pipes 169, 118 and 188 presented in Fig. 1. Wherein, the inlet ends of the respective drain pipes are located at the bottom of each tank, and the outlet ends of the respective drain pipes are located outside the respective tanks.

Further, if any of the grooves in the front aeration tank 160, the free surface flow type aquatic plant purification tank 140, the deoxidation tank 110, the submerged flow aquatic plant purification tank 120 or the rear aeration tank 180 is damaged. In order to facilitate the maintenance of the damaged tank separately, as shown in Fig. 1, in some embodiments, valves 172, 152 may be provided on the connecting water pipes 170, 150, 130 and 182 for connecting the adjacent two grooves, respectively. 132 and 189.

In summary, referring to FIG. 1 and FIG. 2 again, the water treatment method 200 mainly utilizes the denitration performed by the submerged aquatic plant purification tank 120 in the second treatment step 220 to reduce the water to be treated. Nitrate nitrogen to achieve the effect of inhibiting algae proliferation. In addition, before the second processing step 220, the first treatment step 210 is performed on the water to be treated by the deoxidation tank 110, thereby reducing the amount of dissolved oxygen in the water to be treated, thereby strengthening the operation in the submerged aquatic plant purification tank 120. The denitration enhances the efficacy of reducing the algae in the water to be treated in the second treatment step 220.

Furthermore, if the concentration of ammonia nitrogen in the water to be treated is high, an additional pretreatment step 230 may be performed on the water to be treated before the first treatment step 210 to utilize the nitrification performed in the free surface flow aquatic plant purification tank 140. To reduce the ammonia nitrogen concentration.

In addition, the water treatment method 200 can further perform another pre-treatment step 240 by using the front aeration tank 160 before the pre-treatment step 230, thereby increasing the dissolved oxygen amount in the water to be treated to enhance the purification of the free-flowing aquatic plants. Nitrification in the tank 140, thereby enhancing the effect of reducing the concentration of ammonia nitrogen.

In addition, if the amount of dissolved oxygen in the water to be treated is to be increased, the water treatment method 200 may further use the post-aeration tank 180 to treat the treated water for a third treatment step 250 to increase the dissolved oxygen amount after the second treatment step 220. Therefore, the water treatment method 200 can perform various combinations of the foregoing steps as needed.

It should be noted that if the sequence of the water treatment method 200 is reversed, the first processing step 210 and the second processing step 220 can only convert the nitrate nitrogen produced by the nitrification in the water to be treated into nitrogen, and the ammonia nitrogen in the water to be treated passes. Process step 230 converts the ammonia nitrogen to nitrate nitrogen. This in turn increases the nitrate nitrogen of the water to be treated, and provides sufficient nutrients to cause the algae to proliferate and the water quality to deteriorate. Therefore, the order of the steps of the water treatment method 200 cannot be reversed.

As is apparent from the above embodiments, one of the advantages of the water treatment method of the present invention is that the growth of algae can be suppressed without using a chemical agent. Therefore, it is well suited for use in growing organic aquaculture.

It can be seen from the above embodiments that another advantage of the water treatment method of the present invention is that the treatment of the treated water by the deoxidation tank is performed before the submerged flow aquatic plant purification tank to enhance the denitration, thereby improving the reduction of nitric acid. The effect of salt nitrogen.

According to the above embodiments, another advantage of the water treatment method of the present invention is that the water to be treated is treated with the front aeration tank before the pretreatment step of treating the water with the free surface flow type aquatic plant purification tank. A pre-treatment step to enhance nitrification, thereby enhancing the efficacy of reducing ammonia nitrogen concentration.

It can be seen from the above embodiments that another advantage of the water treatment method of the present invention is that it consumes less energy, has low equipment cost, and is easy to operate.

While the present invention has been described above by way of example, it is not intended to be construed as a limitation of the scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100. . . Water treatment system

110. . . Deoxygenation tank

112. . . Porous filter

114. . . Kickboard

116. . . Cover

118. . . Drain pipe

120. . . Submersible aquatic plant purification tank

122. . . Porous filter layer

124. . . First aquatic plant

130. . . Connecting water pipe

132. . . valve

140. . . Free surface flow aquatic plant purification tank

142. . . Soil layer

144. . . Second aquatic plant

150. . . Connecting water pipe

152. . . valve

160. . . Front aeration tank

162. . . Air disc

164. . . Air compression pump

166. . . Shading

167. . . Inflow pipe

168. . . Submersible motor

169. . . Drain pipe

170. . . Connecting water pipe

172. . . valve

180. . . Rear aeration tank

182. . . Connecting water pipe

184. . . Air disc

186. . . Air compression pump

188. . . Drain pipe

189. . . valve

190. . . Water level control slot

192. . . Through hole

194. . . Export

196. . . Outlet pipe

198. . . valve

200. . . method

210. . . step

220. . . step

230. . . step

240. . . step

250. . . step

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

1 is a schematic diagram showing the system architecture of a water treatment system according to an embodiment of the present invention.

2 is a flow chart showing a water treatment method in accordance with an embodiment of the present invention.

200. . . method

210. . . step

220. . . step

230. . . step

240. . . step

250. . . step

Claims (10)

A water treatment method, which is suitable for purifying a water to be treated, and the water treatment method comprises: performing a first treatment step on the water to be treated by using a deoxidation tank, wherein the deoxidation tank is provided with a porous filter material, and the deoxidation a cover plate is disposed at the top of the trough; and after the first processing step, a second processing step is performed on the water to be treated by using a submerged flow aquatic plant purification tank, wherein a porous filter material layer is disposed inside the submerged flow aquatic plant purification tank And at least one first aquatic plant. The water treatment method according to claim 1, wherein the deoxidation tank comprises a floating plate, and the floating plate suspends the at least one porous filter material. The water treatment method of claim 1, wherein the cover plate comprises a first heat shield. The water treatment method of claim 1, wherein the porous filter material comprises a contact filter, a flowable biological contact filter, a honeycomb-type cross-wave contact filter, a floating biofilter, or a combination thereof. The water treatment method according to claim 1, wherein the porous filter layer comprises gravel, waste tire slicing, slag, fly ash, river sand, anthracite, activated carbon, waste concrete block, marble, waste brick, or a combination thereof. The water treatment method according to claim 1, further comprising, before the first processing step, performing a pretreatment step on the water to be treated by using a free surface flow type aquatic plant purification tank, wherein the free surface flow type aquatic plant A soil layer and at least one second aquatic plant are disposed inside the purification tank. The water treatment method according to claim 6, wherein the deoxidation tank and the submerged aquatic plant purification tank are connected by a first connecting water pipe, and the deoxidizing tank and the free surface flowing aquatic plant purification tank The two are connected by a second connecting water pipe, wherein the outlet end of the second connecting water pipe is higher than the inlet end of the first connecting water pipe. The water treatment method according to claim 6, further comprising: before the pre-treatment step, performing a pre-treatment step on the water to be treated by using a front aeration tank, wherein the front aeration tank is internally provided with a first dispersion a gas disk, and the first air diffusion disk is in communication with a first air compression pump. The water treatment method according to claim 8, wherein the top of the front aeration tank is covered with a visor. The water treatment method of claim 8, further comprising the step of: performing a third processing step on the water to be treated by using a post-aeration tank, wherein the rear aeration tank is provided with a second a diffuser disk, and the second air diffuser is in communication with a second air compression pump.