CN116022947A - Eel breeding wastewater treatment system and method - Google Patents
Eel breeding wastewater treatment system and method Download PDFInfo
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- CN116022947A CN116022947A CN202210728379.2A CN202210728379A CN116022947A CN 116022947 A CN116022947 A CN 116022947A CN 202210728379 A CN202210728379 A CN 202210728379A CN 116022947 A CN116022947 A CN 116022947A
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Abstract
The invention belongs to the field of resource recycling and environmental protection, and particularly relates to a system and a method for treating eel culture wastewater. The method mainly comprises two main working procedures of oxidation and adsorption dephosphorization of the cultivation wastewater, wherein the oxidation mainly comprises the steps of removing ammonia nitrogen in the wastewater and converting organic phosphorus in the wastewater into phosphate radicals; the adsorption dephosphorization is to adsorb phosphate radical in the wastewater on a filter material, so that ammonia nitrogen in the treated water body is less than or equal to 1mg/L and total phosphorus is less than or equal to 0.2mg/L; when the invention is adopted to treat eel breeding wastewater, the treatment cost is less than or equal to 0.2 yuan/ton, and the treatment cost is low; has the advantages that 1: when the eel culture wastewater is treated, only the wastewater flows through the filtering adsorption tower, special operation and management are not needed, and the operation is simple; 2: sludge is not generated; 3: the phosphorus adsorbed on the adsorption filter material can recover more than 90% of phosphorus resources through desorption elution and precipitation.
Description
Technical Field
The invention belongs to the field of resource recycling and environmental protection, and particularly relates to a system and a method for treating eel culture wastewater.
Background
COD of eel breeding wastewater Cr About 20 to 30mg/L, BOD 5 About 5-15 mg/L, ammonia nitrogen about 0.5-3 mg/L, total nitrogen about 1-15 mg/L, total phosphorus about 0.5-2 mg/L, the main pollutants are ammonia nitrogen and total phosphorus. If the eel culture wastewater is directly discharged to the environment, nitrogen and phosphorus in surrounding water bodies exceed standards, and the water bodies are eutrophicated, so that the eel culture wastewater must be treated. The method for treating ammonia nitrogen in eel breeding wastewater comprises a physical method, a chemical method and a biological method. Physical methods include reverse osmosis, distillation, soil irrigation and other treatment technologies; chemical method contains ion exchange, ammonia stripping, break point chlorination, incineration, chemical precipitation, catalytic cracking, electrodialysis, electrochemistry and other treatment technologies; biological methods include algae cultivation, biological nitrification, immobilized biotechnology and other treatment technologies. The total phosphorus treatment method in eel culture wastewater comprises chemical precipitation method, electrolytic method, microorganism method, water biological method, physical adsorption method, soil treatment method, membrane technology treatment method, etc. The microbiological, chemical precipitation and physical adsorption processes are the mainstream dephosphorization processes. Although the ammonia nitrogen and the total phosphorus in the wastewater have successful treatment methods, at present, no successful or mature treatment device and method for eel breeding wastewater exist. The biochemical method has large investment and large occupied area, and carbon sources are not required to be added continuously during operation, so that the treatment cost is high; the precipitation method has high treatment cost and also generates a large amount of sludge; therefore, with the development of eel farming industry, an economical and practical eel farming wastewater treatment device and method are urgently needed.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a system and a method for treating eel culture wastewater.
The invention is realized by the following technical scheme:
a treatment system of eel culture wastewater mainly comprises an oxidation device and an adsorption dephosphorization device:
the oxidation device comprises a reaction tank (tank), a dosing tank, a metering dosing pump, a pipeline mixer and a sewage lifting pump, wherein the dosing tank is communicated with a tee joint on a water inlet pipe of the reaction tank (tank) through the metering dosing pump, the tee joint on the water inlet pipe is arranged in front of the pipeline mixer and is communicated with a water inlet of the reaction tank (tank) through the sewage lifting pump, the tee joint and the pipeline mixer, a water inlet of the sewage lifting pump is communicated with a wastewater regulating tank, a water inlet of the reaction tank (tank) is communicated with a water distributor arranged at the bottom of the reaction tank, and a water outlet at the top of the reaction tank is communicated with a water inlet of the adsorption dephosphorization device; the pipeline mixer is used for uniformly mixing the medicine added into the pipeline with the wastewater;
the adsorption dephosphorization device comprises a lift pump, a water inlet valve, a water inlet tee joint, a filtering adsorption tower (barrel), a lower supporting plate, supporting filler, an adsorption filler, an upper supporting plate, a water outlet tee joint and a water outlet valve, wherein the water inlet valve and the water inlet tee joint are sequentially communicated with a water inlet of the filtering adsorption tower (barrel); the water inlet of the water inlet valve is communicated with the water outlet of the oxidation device reaction tank through a lift pump, the water outlet of the water inlet valve is communicated with one water inlet of a water inlet tee joint, the other water inlet of the water inlet tee joint is communicated with the water outlet of a backwash valve of a backwash desorption device, the water outlet of the water inlet tee joint is communicated with the water inlet of a filtration adsorption tower (barrel), the water inlet of the filtration adsorption tower (barrel) is communicated with a water distributor in the filtration adsorption tower (barrel), a lower support plate is arranged at the bottom of the filtration adsorption tower, support filler is arranged above the lower support plate, adsorption filler is filled above the support filler, an upper support plate is arranged at the top of the adsorption filler, the top of the filtration adsorption tower (barrel) is provided with a water outlet, the water outlet is connected with one water inlet of a backwash desorption device, one water outlet of the water outlet tee joint is communicated with a backwash recovery liquid outlet valve, and the other water outlet valve of the water outlet tee joint is communicated with a drain pipe.
The adsorption filler filled in the filtering adsorption tower is special filler for iron-based oxyhydroxide phosphorus adsorption.
The supporting filler filled in the filtering adsorption tower (barrel) is smooth stone.
In an embodiment of the invention, preferably, the eel culture sewage treatment system further comprises a backwash desorption device, wherein the backwash desorption device comprises a backwash liquid storage tank, a backwash pump, a backwash liquid water inlet valve, a filter adsorption tower (barrel), a water outlet tee joint, a backwash liquid water outlet valve and a backwash desorption liquid storage tank, the backwash pump and the backwash liquid water inlet valve are sequentially communicated, the backwash liquid water inlet valve is communicated with one water inlet of a water inlet tee joint of the adsorption dephosphorization device and is communicated with a water inlet of the filter adsorption tower (barrel) through a water outlet of the water inlet tee joint, a water outlet of the filter adsorption tower (barrel) is communicated with a water inlet of the water outlet tee joint, one water outlet of the water outlet tee joint is communicated with a water outlet valve, and the backwash liquid water outlet valve is communicated with the desorption liquid storage tank.
In the embodiment of the invention, more preferably, the eel culture sewage treatment system,
the device comprises a desorption liquid delivery pump, a phosphorus precipitating agent storage tank, a metering dosing pump, a phosphorus recovery tee joint, a pipeline mixer, a phosphorus recovery reaction tank (tank), a phosphorus precipitating tank and a clean water tank, wherein the inlet of the desorption liquid delivery pump is connected with the water outlet of the backwash desorption liquid storage tank, the water outlet of the desorption liquid delivery pump is connected with one inlet of the phosphorus recovery tee joint, the outlet of the phosphorus recovery tee joint is connected with the inlet of the phosphorus recovery reaction tank (tank) through the pipeline mixer, and the other inlet of the phosphorus recovery tee joint is communicated with the phosphorus precipitating agent storage tank through the metering dosing pump; the outlet of the phosphorus recovery reaction tank (tank) is connected with the inlet of the phosphorus sedimentation tank, the water outlet of the phosphorus recovery reaction tank (tank) is connected with the phosphorus sedimentation tank, the water outlet of the phosphorus sedimentation tank is connected with the inlet of the clean water tank, and the outlet of the clean water tank is connected with the drain pipe.
Furthermore, the eel culture sewage treatment system also comprises an eel culture sewage regulating tank in front of the oxidation device, and the eel culture sewage regulating tank is used for regulating water quantity and balancing water quality.
The eel culture sewage treatment method is characterized by comprising the following steps of:
(1) Oxidation of eel culture sewage: the eel breeding sewage to be treated is collected in a sewage regulating tank, pumped into an oxidation device 100 by a sewage lifting pump 160, added with 10-12% commodity sodium hypochlorite according to 50-200 ml/L, uniformly mixed by a pipeline mixer 150, and enters a reaction tank (pot) 110 for oxidation reaction, so that ammonia nitrogen in the sewage is oxidized into nitrogen.
NH 4 + + NaClO —→ NH 2 Cl + H 2 O + Na + (monochloramine)
NH 2 Cl + NaClO —→ NHCl 2 + H 2 O + Na + (dichloramine)
2NH 2 Cl +NaClO—→ N 2 ↑+ 3HCl + H 2 O+Na + (Denitrification primary reaction)
General reaction formula:
2NH 4 + + 3NaClO —→N 2 ↑+ 3HCl + H 2 O+3Na +
the method has the outstanding advantages that the addition amount of sodium hypochlorite and the homogenization of the flow rate can be controlled correctly, so that all ammonia nitrogen in the wastewater is reduced to zero, and the wastewater can be disinfected. For eel breeding wastewater with ammonia nitrogen concentration lower than 2mg/L, the method is economical. Meanwhile, organic phosphorus and polyphosphoric acid are oxidized into phosphate radicals, and oxidized sewage enters the eel culture sewage filtering and adsorbing dephosphorization device 200.
(2) Filtering, adsorbing and dephosphorizing eel culture sewage: opening an eluent water inlet valve 212 and a water outlet valve 219, closing a backwash water inlet valve 223 and a backwash water outlet valve 224, feeding the eel culture sewage oxidized in the step (1) into a filtering adsorption tower (barrel) 210, enabling the sewage to flow out from bottom to top, adsorbing phosphate anions in the sewage by an adsorbent to remove phosphorus in the sewage, and discharging the clear water after phosphorus removal into a natural water body after metering through a water outlet of the filtering adsorption tower (barrel) 210 and the water outlet valve 219.
The filter adsorption tower (barrel) 210 is filled with a special filler for phosphorus adsorption, wherein the special filler for phosphorus adsorption is iron oxyhydroxide, has extremely strong selective adsorption capacity for phosphorus in neutral water, and can rapidly desorb the adsorbed phosphorus when the pH value changes to a strong base. The total phosphorus in the effluent is less than or equal to 0.1mg/L, and the phosphorus removal rate is 95 to 99.5 percent.
Equation (adsorption reaction):
Fe-OOH+H 2 PO 4 - = Fe-O-HPO 4 - +H 2 O
(3) The method of eluting out the phosphate adsorbed in the adsorption filler by using the backwash desorption device is to open the backwash liquid water inlet valve 223 and the backwash liquid outlet valve 224, close the eluent water inlet valve 212 and the effluent valve 219, pump 2-10% sodium hydroxide solution stored in the backwash liquid storage tank 221 into the filtration adsorption tower (barrel) 210 through the backwash pump 222 for repeated cleaning, so that the phosphate adsorbed in the adsorption filler is converted into sodium phosphate to flow out and store in the backwash desorption liquid storage tank 225.
(4) When the adsorption saturation of phosphorus reaches 80-90%, a desorption liquid delivery pump 231 and a metering dosing pump 233 are started to clean the phosphorus adsorption filling material, so that phosphate adsorbed in the filling material is desorbed and flows out along with elution to be stored in a phosphorus sedimentation tank (237); after the desorption is completed, washing the mixture to be neutral by using clear water, and thus completing the regeneration of the adsorption filling; the eluent is 1-5% sodium hydroxide solution.
Reaction formula (desorption reaction):
Fe-O-HPO 4 - +3OH - = Fe-OOH+PO 4 3- +OH - +H 2 O
the method for recovering phosphorus in the backwash desorption liquid by the phosphorus recovery device is that backwash desorption liquid stored in a backwash desorption liquid storage tank 225 is pumped into a phosphorus recovery reaction tank, a phosphorus precipitator is added, phosphate radical in the recovery liquid reacts with calcium ions to generate calcium phosphate precipitate, and the calcium phosphate precipitate is separated by precipitation and dried to obtain recovered calcium phosphate.
Pumping the phosphorus eluent stored in the phosphorus recovery liquid storage tank into a precipitation reaction tank, starting a dosing pump, pumping the calcium hydroxide saturated solution stored in the phosphorus precipitant storage tank (232) into the reaction tank to react to generate calcium phosphate precipitate, pumping the calcium phosphate precipitate into the phosphorus precipitation tank to precipitate, and obtaining the recovered calcium phosphate as the precipitate.
Reaction formula (precipitation crystallization reaction):
PO 4 3- +3/2Ca(OH) 2 = 1/2Ca 3 （PO 4 ） 2 +3OH -
the principle of the phosphorus removal of the cultivation wastewater is as follows:
the reaction equation for adsorption, desorption and phosphorus resource recovery is as follows:
removing phosphorus in sewage (adsorption reaction)
Fe-OOH+H 2 PO 4 - = Fe-O-HPO 4 - +H 2 O
Regeneration of adsorbents (desorption reactions)
Fe-O-HPO 4 - +3OH - = Fe-OOH+PO 4 3- +OH - +H 2 O
Phosphorus resource recovery (flocculation crystallization reaction)
PO 4 3- +3/2Ca(OH) 2 = 1/2Ca 3 （PO 4 ） 2 +3OH -
The phosphorus precipitant is a clarified saturated calcium hydroxide solution or a 5-25% calcium chloride solution.
The eel culture wastewater treatment system has the following beneficial effects:
1. the eel breeding wastewater is treated only comprising two main processes of oxidization and filtration adsorption of the breeding wastewater, wherein the oxidization mainly comprises the steps of removing ammonia nitrogen in the wastewater and converting organic phosphorus in the wastewater into phosphate radicals; the filtering and adsorbing process is to adsorb phosphate radical in the waste water onto the filtering material to make ammonia nitrogen in the treated water body less than or equal to 1mg/L and total phosphorus less than or equal to 0.2mg/L;
2. when the invention is adopted to treat eel breeding wastewater, the treatment cost is less than or equal to 0.2 yuan/ton, and the treatment cost is low;
3. when the method is used for treating eel culture wastewater, only the wastewater flows through the filtering adsorption tower, special operation and management are not needed, and the operation is simple;
4. sludge is not generated;
5. the phosphorus adsorbed on the adsorption filter material can recover more than 90% of phosphorus resources through desorption elution and precipitation.
Drawings
FIG. 1 is a process flow diagram of a treatment system of the present invention;
FIG. 2 is a schematic diagram of the treatment system of the oxidizer of the present invention;
FIG. 3 is a schematic diagram of a treatment system of the adsorption dephosphorization apparatus of the present invention;
FIG. 4 is a schematic diagram of a treatment system of a backwash desorption apparatus of the present invention;
FIG. 5 is a schematic diagram of a treatment system for a phosphorus recovery device of the present invention;
FIG. 6 is a schematic diagram of the wastewater dephosphorization operation of the present invention;
FIG. 7 is a diagram showing the effect of the steps of the apparatus and method of the present invention;
FIG. 8 is a graph showing the index of water inflow and standard reaching index of water outflow of the eel breeding wastewater to be treated according to the apparatus and method of the present invention in example 1;
FIG. 9 is a graph showing pollutant index data of oxidized eel culture wastewater using the apparatus and method of the present invention in example 1;
FIG. 10 is a graph of index data of effluent after phosphorus removal by adsorption using the apparatus and method of the present invention in example 1;
FIG. 11 is a graph showing the index of water inflow and standard reaching index of water outflow of eel breeding wastewater to be treated according to the apparatus and method of the present invention in example 2;
FIG. 12 is a graph showing pollutant index data of oxidized eel culture wastewater using the apparatus and method of the present invention in example 2;
FIG. 13 is a graph of index data of effluent after phosphorus removal by adsorption using the apparatus and method of the present invention in example 2;
FIG. 14 is a graph showing the index of water inflow and standard of water outflow of the eel culture wastewater to be treated according to the apparatus and method of the present invention in example 3;
FIG. 15 is a graph showing pollutant index data of oxidized eel culture wastewater using the apparatus and method of the present invention in example 3;
FIG. 16 is a graph of the index data of the effluent after phosphorus removal by adsorption using the apparatus and method of the present invention in example 3.
The specific embodiment is as follows:
referring to fig. 1 to 6, a system for treating eel culture wastewater mainly comprises an oxidation device 100 and an adsorption dephosphorization device 200:
the oxidation device 100 comprises a reaction tank (tank) 110, a dosing tank 120, a metering dosing pump 130, a pipeline mixer 150 and a sewage lifting pump 160, wherein the dosing tank 120 is communicated with a tee joint 140 on a water inlet pipe of the reaction tank (tank) 110 through the metering dosing pump 130, the tee joint 140 on the water inlet pipe is arranged in front of the pipeline mixer 150, is communicated with a water inlet of the reaction tank (tank) 110 through the sewage lifting pump 160, the tee joint 140 and the pipeline mixer 150, a water inlet of the sewage lifting pump 160 is communicated with a wastewater regulating tank (not shown in the figure), a water inlet 111 of the reaction tank (tank) 110 is communicated with a water distributor 170 arranged at the bottom of the reaction tank (tank) 110, and a water outlet 112 at the top of the reaction tank (tank) 110 is communicated with a water inlet of the adsorption dephosphorization device 200; the pipe mixer 150 is used for uniformly mixing the medicine added into the pipe with the wastewater;
the adsorption dephosphorization device 200 comprises a lift pump 211, a water inlet valve 212, a water inlet tee joint 213, a filtering adsorption tower (barrel) 210, a lower supporting plate 214, supporting fillers 215, an adsorption filler 216, an upper supporting plate 217, a water outlet tee joint 218 and a water outlet valve 219, wherein the water inlet valve 212 and the water inlet tee joint 213 are sequentially communicated with a water inlet of the filtering adsorption tower (barrel) 210; the water inlet of the water inlet valve 212 is communicated with the water outlet of the reaction tank (pot) 110 of the oxidation device 100 through a lift pump 211, the water outlet of the water inlet valve 212 is communicated with one water inlet of a water inlet tee 213, the other water inlet of the water inlet tee 213 is communicated with the water outlet of a backwash valve 223 of a backwash desorption device 220, the water outlet of the water inlet tee 213 is communicated with the water inlet of a filtration adsorption tower (barrel) 210, the water inlet of the filtration adsorption tower (barrel) 210 is communicated with a water distributor 170 in the filtration adsorption tower (barrel) 210, a lower support plate 214 is arranged at the bottom of the filtration adsorption tower (barrel) 210, a support filler 215 is arranged above the lower support plate 214, an adsorption filler 216 is filled above the support filler 215, an upper support plate 217 is arranged at the top of the adsorption filler 216, the top of the filtration adsorption tower (barrel) 210 is provided with a water outlet, the water outlet is connected with one water inlet of a water outlet tee 218, the water outlet of the water outlet tee 218 is communicated with a water outlet 219, the other water outlet of the water outlet tee 218 is communicated with a backwash liquid outlet valve 224, and the water outlet valve 219 is not shown in the water outlet valve (figure).
The adsorption packing 216 filled in the filter adsorption tower (barrel) 210 is a special packing for iron-based oxyhydroxide phosphorus adsorption.
The supporting packing 215 packed in the filtering and adsorbing tower (tub) 210 is smooth stone.
The device further comprises a backwash desorption device 220, wherein the backwash desorption device 220 comprises a backwash liquid storage tank 221, a backwash pump 222, a backwash liquid water inlet valve 223, a filtration adsorption tower (barrel) 210, a water outlet tee joint 218, a backwash liquid water outlet valve 224 and a backwash desorption liquid storage tank 225, the backwash liquid storage tank 221, the backwash pump 222 and the backwash liquid water inlet valve 223 are sequentially communicated, the backwash liquid water inlet valve 223 is communicated with one water inlet of the water inlet tee joint 213 of the adsorption dephosphorization device 200 and is communicated with the water inlet of the filtration adsorption tower (barrel) 210 through the water outlet of the water inlet tee joint 213, the water outlet of the filtration adsorption tower (barrel) 210 is communicated with the water inlet of the water outlet tee joint 218, one water outlet of the water outlet tee joint 218 is communicated with the water outlet valve 219, the other water outlet is communicated with the backwash liquid water outlet valve 224, and the backwash liquid water outlet valve 224 is communicated with the desorption liquid storage tank 225.
The device also comprises a phosphorus recovery device 230, wherein the phosphorus recovery device 230 is composed of a desorption liquid delivery pump 231, a phosphorus precipitator storage tank 232, a metering dosing pump 233, a phosphorus recovery tee joint 234, a pipeline mixer 235, a phosphorus recovery reaction tank (tank) 236, a phosphorus precipitation tank 237 and a clean water tank 238, the inlet of the desorption liquid delivery pump 231 is connected with the water outlet of the backwash desorption liquid storage tank 225, the water outlet of the desorption liquid delivery pump 231 is connected with one inlet of the phosphorus recovery tee joint 234, the outlet of the phosphorus recovery tee joint 234 is connected with the inlet of the phosphorus recovery reaction tank (tank) 236 through the pipeline mixer 235, and the other inlet of the phosphorus recovery tee joint 234 is communicated with the phosphorus precipitator storage tank 232 through the metering dosing pump 233; the water outlet of the phosphorus recovery reaction tank (tank) 236 is connected with the phosphorus sedimentation tank 237, the outlet of the phosphorus recovery reaction tank (tank) 236 is connected with the inlet of the phosphorus sedimentation tank 237, the water outlet of the phosphorus sedimentation tank 237 is connected with the inlet of the clean water tank 238, and the outlet of the clean water tank 238 is connected with a drain pipe (not shown in the figure).
Furthermore, the eel culture sewage treatment system is characterized by further comprising an eel culture sewage regulating tank in front of the oxidation device, and the eel culture sewage regulating tank is used for regulating water quantity and balancing water quality.
The eel culture sewage treatment method is characterized by comprising the following steps of:
(1) Oxidation of eel culture sewage: the eel breeding sewage to be treated is collected in a sewage regulating tank, pumped into an oxidation device 100 by a sewage lifting pump 160, added with 10-12% commodity sodium hypochlorite according to 50-200 ml/L, uniformly mixed by a pipeline mixer 150, and enters a reaction tank (pot) 110 for oxidation reaction, so that ammonia nitrogen in the sewage is oxidized into nitrogen.
NH 4 + + NaClO —→ NH 2 Cl + H 2 O + Na + (monochloramine)
NH 2 Cl + NaClO —→ NHCl 2 + H 2 O + Na + (dichloramine)
2NH 2 Cl +NaClO—→ N 2 ↑+ 3HCl + H 2 O+Na + (Denitrification primary reaction)
General reaction formula:
2NH 4 + + 3NaClO —→N 2 ↑+ 3HCl + H 2 O+3Na +
the method has the outstanding advantages that the addition amount of sodium hypochlorite and the homogenization of the flow rate can be controlled correctly, so that all ammonia nitrogen in the wastewater is reduced to zero, and the wastewater can be disinfected. For eel breeding wastewater with ammonia nitrogen concentration lower than 2mg/L, the method is economical. Meanwhile, organic phosphorus and polyphosphoric acid are oxidized into phosphate radicals, and oxidized sewage enters the eel culture sewage filtering and adsorbing dephosphorization device 200.
(2) Filtering, adsorbing and dephosphorizing eel culture sewage: opening an eluent water inlet valve 212 and a water outlet valve 219, closing a backwash water inlet valve 223 and a backwash water outlet valve 224, feeding the eel culture sewage oxidized in the step (1) into a filtering adsorption tower (barrel) 210, enabling the sewage to flow out from bottom to top, adsorbing phosphate anions in the sewage by an adsorbent to remove phosphorus in the sewage, and discharging the clear water after phosphorus removal into a natural water body after metering through a water outlet of the filtering adsorption tower (barrel) 210 and the water outlet valve 219.
The filter adsorption tower (barrel) 210 is filled with a special filler for phosphorus adsorption, wherein the special filler for phosphorus adsorption is iron oxyhydroxide, has extremely strong selective adsorption capacity for phosphorus in neutral water, and can rapidly desorb the adsorbed phosphorus when the pH value changes to a strong base. The total phosphorus in the effluent is less than or equal to 0.1mg/L, and the phosphorus removal rate is 95 to 99.5 percent.
Equation (adsorption reaction):
Fe-OOH+H 2 PO 4 - = Fe-O-HPO 4 - +H 2 O
(3) The method of eluting out the phosphate adsorbed in the adsorption filler by using the backwash desorption device is to open the backwash liquid water inlet valve 223 and the backwash liquid outlet valve 224, close the eluent water inlet valve 212 and the effluent valve 219, pump 2-10% sodium hydroxide solution stored in the backwash liquid storage tank 221 into the filtration adsorption tower (barrel) 210 through the backwash pump 222 for repeated cleaning, so that the phosphate adsorbed in the adsorption filler is converted into sodium phosphate to flow out and store in the backwash desorption liquid storage tank 225.
(4) When the adsorption saturation of phosphorus reaches 80-90%, a desorption liquid delivery pump 231 and a metering dosing pump 233 are started to clean the phosphorus adsorption filling material, so that phosphate adsorbed in the filling material is desorbed and flows out along with elution to be stored in a phosphorus sedimentation tank (237); after the desorption is completed, washing the mixture to be neutral by using clear water, and thus completing the regeneration of the adsorption filling; the eluent is 1-5% sodium hydroxide solution.
Reaction formula (desorption reaction):
Fe-O-HPO 4 - +3OH - = Fe-OOH+PO 4 3- +OH - +H 2 O
the method for recovering phosphorus in the backwash desorption liquid by the phosphorus recovery device is that backwash desorption liquid stored in a backwash desorption liquid storage tank 225 is pumped into a phosphorus recovery reaction tank, a phosphorus precipitator is added, phosphate radical in the recovery liquid reacts with calcium ions to generate calcium phosphate precipitate, and the calcium phosphate precipitate is separated by precipitation and dried to obtain recovered calcium phosphate, and the principle is shown in figure 6.
Pumping the phosphorus eluent stored in the phosphorus recovery liquid storage tank into a precipitation reaction tank, starting a dosing pump, pumping the calcium hydroxide saturated solution stored in the phosphorus precipitant storage tank (232) into the reaction tank to react to generate calcium phosphate precipitate, pumping the calcium phosphate precipitate into the phosphorus precipitation tank to precipitate, and obtaining the recovered calcium phosphate as the precipitate.
Reaction formula (precipitation crystallization reaction):
PO 4 3- +3/2Ca(OH) 2 = 1/2Ca 3 （PO 4 ） 2 +3OH -
the principle of the phosphorus removal of the cultivation wastewater is as follows:
the reaction equation for adsorption, desorption and phosphorus resource recovery is as follows:
removing phosphorus in sewage (adsorption reaction)
Fe-OOH+H 2 PO 4 - = Fe-O-HPO 4 - +H 2 O
Regeneration of adsorbents (desorption reactions)
Fe-O-HPO 4 - +3OH - = Fe-OOH+PO 4 3- +OH - +H 2 O
Phosphorus resource recovery (flocculation crystallization reaction)
PO 4 3- +3/2Ca(OH) 2 = 1/2Ca 3 （PO 4 ） 2 +3OH -
The phosphorus precipitant is a clarified saturated calcium hydroxide solution or a 5-25% calcium chloride solution.
When the system and the method of the invention are used for treating eel breeding wastewater, the treatment effect of each step is shown in figure 7.
The effluent indexes of the eel culture wastewater to be treated after being treated by two steps of oxidization, filtration and adsorption are as follows: ammonia nitrogen is less than or equal to 1.0mg/L, and total phosphorus is less than or equal to 0.2mg/L.
Example 1
500 tons/day eel culture wastewater treatment system:
referring to fig. 2 to 3, the system for treating eel culture wastewater provided in this embodiment includes an oxidation apparatus 100 and a filtering and adsorbing dephosphorizing apparatus 200.
The oxidation apparatus 100 includes a reaction tank (pot) 110 having a volume of 5m 3 The volume of the dosing tank 120 is 0.1m 3 The dosing tank 120 is communicated with a tee joint 140 on a water inlet pipe of the reaction tank 110 through the dosing pump 130, the tee joint 140 on the water inlet pipe is arranged in front of the pipeline mixer 150, a water inlet of the sewage lift pump 160 is communicated with a wastewater regulating tank, the sewage lift pump 160, the tee joint 140 and the pipeline mixer 150 are communicated with a water inlet 111 of the reaction tank 110, the water inlet 111 of the reaction tank 110 is communicated with a water distributor 170 arranged at the bottom of the reaction tank 110, and a water outlet 112 at the top of the reaction tank 110 is communicated with a water inlet of the filtering and adsorbing device 200; the pipe mixer 150 is used for uniformly mixing the medicine added into the pipe with the wastewater;
the adsorption dephosphorization device 200 comprises a lift pump 211, a water inlet valve 212, a water inlet tee joint 213, a filtering adsorption tower (barrel) 210, the specification is phi 2.6m, the height is 4.25 m, and the tank capacity is 20m 3 The lower support plate 214, the support packing 215, the adsorption packing 216, the upper support plate 217, the water outlet tee 218 and the water outlet valve 219, the water inlet valve 212 and the water inlet tee 213 are sequentially communicated with the water inlet of the filtering adsorption tower (barrel) 210. The water inlet of the lifting pump 211 is communicated with the water outlet 112 of the reaction tank 110 of the oxidation device 100, the water outlet of the water inlet valve 212 is communicated with one water inlet of the water inlet tee 213, the other water inlet of the water inlet tee 213 is communicated with the water outlet of the backwash liquid water inlet valve 223 of the backwash desorption device 220, the water outlet of the water inlet tee 213 is communicated with the water inlet of the filtration adsorption tower (barrel) 210, the water inlet of the filtration adsorption tower (barrel) 210 is communicated with the water distributor 170 in the filtration adsorption tower (barrel) 210, the bottom of the adsorption tower 210 is provided with a lower support plate 214, andthe support packing 215 is installed to lower backup pad 214 top, support packing 216 is packed to support packing 215 top, upper backup pad 217 is installed at the adsorption packing 216 top, the top of filtration adsorption tower (bucket) 210 is provided with the delivery port, the delivery port is connected with the water inlet of play water tee bend 218, a delivery port and the water outlet valve 219 intercommunication of play water tee bend 218, another delivery port and backwash desorption liquid play water valve 224 intercommunication of play water tee bend 218, play water valve 219 and drain pipe intercommunication.
In this example, the index of water inflow and the index of water outflow reaching standards of eel breeding wastewater to be treated are shown in figure 8.
The eel culture wastewater treatment method adopted in the embodiment sequentially comprises two steps of oxidization and filtration and adsorption, and specifically:
the eel breeding wastewater to be treated is collected in a rare earth wastewater regulating tank, the breeding wastewater is pumped into a reaction tank (pot) 110 by a sewage lifting pump 160, and 10-12% of commodity sodium hypochlorite is added according to the addition ratio of 50ml/L, and is uniformly mixed by a pipeline mixer 150, and enters the reaction tank (pot) 110 for oxidation reaction.
The pollutant index of the oxidized eel culture wastewater is shown in figure 9.
As can be seen from FIG. 9, the oxidation device 100 of the eel culture wastewater treatment system can oxidize ammonia nitrogen in wastewater from 1mg/L to less than 0.5mg/L, and the total phosphorus concentration is unchanged after oxidation treatment.
The oxidized cultivation wastewater is pumped into the phosphorus filtering and adsorbing device 200, and the flow is 21m 3 The index of the effluent after filtration and adsorption is shown in figure 10.
As can be seen from the figure 10, after the eel culture wastewater is treated by two steps of oxidization and filtration adsorption, ammonia nitrogen in the discharged water is less than or equal to 0.5mg/L, total phosphorus is less than or equal to 0.2mg/L, and the ammonia nitrogen and total phosphorus indexes of the discharged water meet class III water indexes corresponding to the table 1 of the surface water environment quality standard (GB 3838-2002).
Example 2
1000 ton/day eel breeding wastewater treatment system
Referring to fig. 2 to 3, the system for treating eel culture wastewater provided in this embodiment includes an oxidation apparatus 100 and a filtering and adsorbing dephosphorizing apparatus 200.
The oxidation apparatus 100 includes a reaction tank (pot) 110 having a volume of 10m 3 The volume of the dosing tank 120 is 0.2m 3 The dosing tank 120 is communicated with a tee joint 140 on a water inlet pipe of the reaction tank 110 through the dosing pump 130, the tee joint 140 on the water inlet pipe is arranged in front of the pipeline mixer 150, the tee joint 140 and the pipeline mixer 150 are communicated with a water inlet of the reaction tank 110 through the sewage lifting pump 160), the water inlet of the sewage lifting pump 160 is communicated with a wastewater regulating tank, the water inlet 111 of the reaction tank 110 is communicated with a water distributor 170 arranged at the bottom of the reaction tank, and the water outlet 112 at the top of the reaction tank is communicated with a water inlet of the adsorption dephosphorization device 200; the pipe mixer 150 is used for uniformly mixing the medicine added into the pipe with the wastewater;
the adsorption dephosphorization device 200 comprises a lift pump 211, a water inlet valve 212, a water inlet tee joint 213, a filtering adsorption tower (barrel) 210, the specification is phi 3.6m, the height is 5.0 m, and the tank capacity is 45m 3 The water inlet valve 212 and the water inlet tee joint 213 are sequentially communicated with the water inlet of the filtering adsorption tower (barrel) 210, the water inlet of the lifting pump 211 is communicated with the water outlet 112 of the reaction tank 110 of the oxidation device 100, the water outlet of the water inlet valve 212 is communicated with one water inlet of the water inlet tee joint 213, the other water inlet of the water inlet tee joint 213 is communicated with the water outlet of the backwash liquid water inlet valve 223 of the backwash desorption device 220, the water outlet of the water inlet tee joint 213 is communicated with the water inlet of the filtering adsorption tower (barrel) 210, the water inlet of the filtering adsorption tower (barrel) 210 is communicated with the water distributor 170 of the filtering adsorption tower (barrel) 210, the lower support plate 214 is installed at the bottom of the adsorption tower 210, the supporting filler 215 is installed above the lower support plate 214, the adsorbing filler 216 is filled above the supporting filler 215, the upper support plate 217 is installed at the top of the adsorption filler (216), the top of the filtering adsorption tower (barrel) 210 is provided with the water outlet, and the water outlet is connected with the water inlet of the water outlet tee joint 218One water outlet of the water outlet tee 218 is communicated with a water outlet valve 219, the other water outlet of the water outlet tee 218 is communicated with a backwash desorption liquid outlet valve 224, and the water outlet valve 219 is communicated with a drain pipe.
In this embodiment, preferably, the eel culture sewage treatment system further includes a backwash desorption device 220, where the backwash desorption device 220 includes a backwash liquid storage tank 221, a backwash pump 222, a backwash liquid water inlet valve 223, a filtration adsorption tower (barrel) 210, a water outlet tee 218, a backwash liquid water outlet valve 224, and a backwash desorption liquid storage tank 225, the backwash liquid storage tank 221, the backwash pump 222, and the backwash liquid water inlet valve 223 are sequentially connected, the backwash liquid water inlet valve 223 is connected with one water inlet of the water inlet tee 213 of the adsorption dephosphorization device 200 and is connected with the water inlet of the filtration adsorption tower (barrel) 210 through the water outlet of the water inlet tee 213, the water outlet of the filtration adsorption tower (barrel) 210 is connected with the water inlet of the water outlet tee 218, one water outlet of the water outlet tee 218 is connected with the water outlet valve 219, the other water outlet is connected with the backwash liquid water outlet valve 224, and the backwash liquid water outlet valve 224 is connected with the backwash desorption liquid storage tank 225.
In the embodiment of the invention, more preferably, the eel culture sewage treatment system further comprises a phosphorus recovery device 230, wherein the phosphorus recovery device 230 is composed of a desorption liquid delivery pump 231, a phosphorus precipitator storage tank 232, a metering and dosing pump 233, a phosphorus recovery tee 234, a pipeline mixer 235, a phosphorus recovery reaction tank (tank) 236, a phosphorus precipitator 237 and a clean water tank 238, the inlet of the desorption liquid delivery pump 231 is connected with the water outlet of the backwash desorption liquid storage tank 225, the water outlet of the desorption liquid delivery pump 231 is connected with one inlet of the phosphorus recovery tee 234, and the outlet of the phosphorus recovery tee 234 is connected with the inlet of the phosphorus recovery reaction tank (tank) 236 through the pipeline mixer 235; the other inlet of the phosphorus recovery tee 234 is connected with a phosphorus precipitant storage tank 232 through a metering and dosing pump 233, the outlet of a phosphorus recovery reaction tank (tank) 236 is connected with the inlet of a phosphorus sedimentation tank 237, the water outlet of the phosphorus sedimentation tank 237 is connected with the inlet of a clean water tank 238, and the outlet of the clean water tank 238 is connected with a drain pipe.
In this embodiment, the index of water inflow and the index of water outflow reaching standards of eel culture wastewater to be treated are shown in figure 11.
The eel culture wastewater treatment method adopted in the embodiment sequentially comprises two steps of oxidization and filtration and adsorption, and specifically:
the eel breeding wastewater to be treated is collected in a rare earth wastewater regulating tank, the breeding wastewater is pumped into a reaction tank (pot) 110 by a sewage lifting pump 160, and 10-12% of commodity sodium hypochlorite is added according to 200ml/L, and is uniformly mixed by a pipeline mixer 150, and enters the reaction tank (pot) 110 for oxidation reaction.
The pollutant index of the oxidized eel culture wastewater is shown in figure 12.
As can be seen from FIG. 12, the oxidation device 100 of the eel culture wastewater treatment system can oxidize ammonia nitrogen in wastewater from 3mg/L to less than 1.0mg/L, and the total phosphorus concentration is unchanged after oxidation treatment.
The oxidized cultivation wastewater is pumped into the phosphorus filtering and adsorbing device 200, and the flow is 42m 3 The index of the effluent after filtration and adsorption is shown in figure 13.
As can be seen from the figure 13, after the eel culture wastewater is treated by two steps of oxidization and filtration adsorption, ammonia nitrogen in the discharged water is less than or equal to 1.0mg/L, total phosphorus is less than or equal to 0.2mg/L, and the ammonia nitrogen and total phosphorus index of the discharged water meet the class III water index corresponding to the surface water environment quality standard (GB 3838-2002) table 1.
Backwash desorption (regeneration of filter adsorption packing): by metering, when the adsorption dephosphorization is close to saturation, the adsorption dephosphorization device 200 is closed, the backwash desorption device 220 is started, 5-20% sodium hydroxide solution is pumped in to soak for 2 hours, the sodium hydroxide solution is pumped out after 2 hours and stored in the backwash desorption liquid storage tank 225, and the filtration adsorption tower (barrel) 210 pumped out the sodium hydroxide solution is washed with clean water until the pH value is 6-9 for reuse.
Phosphorus recovery: pumping the backwash liquid stored in the backwash desorption liquid storage tank 225 into a phosphorus recovery reaction tank (tank) 236 of the phosphorus recovery device 230, metering in a saturated calcium hydroxide solution to react to generate calcium phosphate precipitate, pumping into a phosphorus precipitation tank 237 for precipitation separation, and drying to obtain the recovered calcium phosphate.
Example 3
500 ton/day eel breeding wastewater treatment system
Referring to fig. 2 to 3, the system for treating eel culture wastewater provided in this embodiment includes an oxidation apparatus 100 and an adsorption dephosphorization apparatus 200.
The oxidation apparatus 100 includes a reaction tank (pot) 110 having a volume of 5m 3 The volume of the dosing tank 120 is 0.1m 3 The dosing tank 120 is communicated with a tee joint 140 on a water inlet pipe of the reaction tank 110 through the dosing pump 130, the tee joint 140 on the water inlet pipe is arranged in front of the pipeline mixer 150, the tee joint 140 on the water inlet pipe is communicated with a water inlet of the reaction tank 110 through the sewage lifting pump 160, the tee joint 140 and the pipeline mixer 150, a water inlet of the sewage lifting pump 160 is communicated with a wastewater regulating tank, a water inlet 111 of the reaction tank 110 is communicated with a water distributor 170 arranged at the bottom of the reaction tank, and a water outlet 112 at the top of the reaction tank 110 is communicated with a water inlet of the adsorption dephosphorization device 200; the pipe mixer 150 is used for uniformly mixing the medicines added into the pipe;
the adsorption dephosphorization device 200 comprises a lift pump 211, a water inlet valve 212, a water inlet tee joint 213, a filtering adsorption tower (barrel) 210, the specification is phi 2.6m, the height is 4.25 m, and the tank capacity is 20m 3 The lower support plate 214, the support packing 215, the adsorption packing 216, the upper support plate 217, the water outlet tee 218 and the water outlet valve 219, the water inlet valve 212 and the water inlet tee 213 are sequentially communicated with the water inlet of the filtering adsorption tower (barrel) 210. The water inlet of the lifting pump 211 is communicated with the water outlet 112 of the reaction tank 110 of the oxidation device 100, the water outlet of the water inlet valve 212 is communicated with one water inlet of the water inlet tee 213, the other water inlet of the water inlet tee 213 is communicated with the water outlet of the backwash liquid water inlet valve 223 of the backwash desorption device 220, the water outlet of the water inlet tee 213 is communicated with the water inlet of the filtration adsorption tower (barrel) 210, the water inlet of the filtration adsorption tower (barrel) 210 is communicated with the water distributor 170 of the filtration adsorption tower (barrel) 210, the bottom of the adsorption tower 210 is provided with a lower support plate 214, a support filler 215 is arranged above the lower support plate 214, an adsorption filler 216 is filled above the support filler 215, an upper support plate 217 is arranged at the top of the adsorption filler 216, and the filtration adsorption tower (barrel) 210 is communicated with the water distributor 170Barrel) 210 is provided with a water outlet connected with a water inlet of a water outlet tee (218), one water outlet of the water outlet tee 218 is communicated with a water outlet valve 219, the other water outlet of the water outlet tee 218 is communicated with a backwash desorption liquid water outlet valve 224, and the water outlet valve 219 is communicated with a drain pipe.
In this example, the index of water inflow and the index of water outflow reaching standards of eel culture wastewater to be treated are shown in figure 14.
The eel culture wastewater treatment method adopted in the embodiment sequentially comprises two steps of oxidization and filtration and adsorption, and specifically:
collecting eel breeding wastewater in a rare earth wastewater regulating tank, pumping the breeding wastewater into a reaction tank (110) by a lift pump 160, adding 150ml/L of commercial sodium hypochlorite with the concentration of 10-12%, uniformly mixing the commercial sodium hypochlorite with the commercial sodium hypochlorite by a pipeline mixer, and enabling the commercial sodium hypochlorite to enter the reaction tank (tank) for oxidation reaction.
The pollutant index of the oxidized eel culture wastewater is shown in figure 15.
As can be seen from FIG. 15, the oxidation device 100 of the eel culture wastewater treatment system can oxidize ammonia nitrogen in wastewater from 1.5mg/L to less than 1.0mg/L, and the total phosphorus concentration is unchanged after oxidation treatment.
The oxidized cultivation wastewater is pumped into the phosphorus adsorption and removal device 200, and the flow is 21m 3 The index of the effluent after filtration and adsorption is shown in figure 16.
As can be seen from the figure 16, after the eel culture wastewater is treated by two steps of oxidation and adsorption dephosphorization, ammonia nitrogen of the effluent is less than or equal to 1.0mg/L, total phosphorus is less than or equal to 0.2mg/L, and the ammonia nitrogen and total phosphorus index of the effluent meet class III water indexes corresponding to the surface water environment quality standard (GB 3838-2002) in Table 1.
While the foregoing description illustrates and describes the preferred embodiments of the present invention, as noted above, it is to be understood that the invention is not limited to the forms disclosed herein but is not to be construed as excluding other embodiments, and that various other combinations, modifications and environments are possible and may be made within the scope of the inventive concepts described herein, either by way of the foregoing teachings or by those of skill or knowledge of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (7)
1. A eel culture wastewater treatment system is characterized in that: mainly comprises an oxidation device and an adsorption dephosphorization device:
the oxidation device comprises a reaction tank/tank, a dosing tank, a metering dosing pump, a pipeline mixer and a sewage lifting pump, wherein the dosing tank is communicated with a tee joint on a water inlet pipe of the reaction tank/tank through the metering dosing pump, the tee joint on the water inlet pipe is arranged in front of the pipeline mixer and is communicated with a water inlet of the reaction tank/tank through the sewage lifting pump, the tee joint and the pipeline mixer, a water inlet of the sewage lifting pump is communicated with a wastewater regulating tank, a water inlet of the reaction tank/tank is communicated with a water distributor arranged at the bottom of the reaction tank, and a water outlet at the top of the reaction tank is communicated with a water inlet of the adsorption dephosphorization device; the pipeline mixer is used for uniformly mixing the medicine added into the pipeline with the wastewater;
the adsorption dephosphorization device comprises a lift pump, a water inlet valve, a water inlet tee joint, a filtering adsorption tower/barrel, a lower supporting plate, supporting filler, adsorption filler, an upper supporting plate, a water outlet tee joint and a water outlet valve, wherein the water inlet valve and the water inlet tee joint are sequentially communicated with a water inlet of the filtering adsorption tower/barrel; the water inlet of the water inlet valve is communicated with the water outlet of the oxidation device reaction tank through a lift pump, the water outlet of the water inlet valve is communicated with one water inlet of a water inlet tee joint, the other water inlet of the water inlet tee joint is communicated with the water outlet of a backwash valve of a backwash desorption device, the water outlet of the water inlet tee joint is communicated with the water inlet of a filtration adsorption tower/barrel, the water inlet of the filtration adsorption tower/barrel is communicated with a water distributor in the filtration adsorption tower/barrel, a lower support plate is arranged at the bottom of the adsorption tower, a support filler is arranged above the lower support plate, an adsorption filler is filled above the support filler, an upper support plate is arranged at the top of the adsorption filler, the top of the filtration adsorption tower/barrel is provided with a water outlet, the water outlet is connected with one water inlet of a backwash recovery liquid outlet valve, and the other water outlet of the water outlet tee joint is communicated with a backwash recovery liquid outlet valve.
2. The eel culture wastewater treatment system according to claim 1, wherein: the device comprises a back washing desorption device, and is characterized by further comprising a back washing liquid storage tank, a back washing pump, a back washing liquid water inlet valve, a filtering adsorption tower/barrel, a water outlet tee joint, a back washing liquid water outlet valve and a back washing desorption liquid storage tank, wherein the back washing liquid storage tank, the back washing pump and the back washing liquid water inlet valve are sequentially communicated, the back washing liquid water inlet valve is communicated with one water inlet of the water inlet tee joint of the adsorption dephosphorization device and is communicated with the water inlet of the filtering adsorption tower/barrel through a water inlet tee joint, the water outlet of the filtering adsorption tower/barrel is communicated with the water inlet of the water outlet tee joint, one water outlet of the water outlet tee joint is communicated with a water outlet valve, the other water outlet is communicated with the back washing liquid water outlet valve, and the back washing liquid water outlet valve is communicated with the back washing desorption liquid storage tank.
3. The eel culture wastewater treatment system according to claim 1, wherein: the device comprises a desorption liquid delivery pump, a phosphorus precipitating agent storage tank, a metering dosing pump, a phosphorus recovery tee joint, a pipeline mixer, a phosphorus recovery reaction tank/tank, a phosphorus precipitating tank and a clean water tank, wherein the inlet of the desorption liquid delivery pump is connected with the water outlet of the backwash desorption liquid storage tank, the water outlet of the desorption liquid delivery pump is connected with one inlet of the phosphorus recovery tee joint, the outlet of the phosphorus recovery tee joint is connected with the inlet of the phosphorus recovery reaction tank/tank through the pipeline mixer, and the other inlet of the phosphorus recovery tee joint is communicated with the phosphorus precipitating agent storage tank through the metering dosing pump; the outlet of the phosphorus recovery reaction tank/tank is connected with the inlet of the phosphorus sedimentation tank, the water outlet of the phosphorus recovery reaction tank/tank is connected with the phosphorus sedimentation tank, the water outlet of the phosphorus sedimentation tank is connected with the inlet of the clean water tank, and the outlet of the clean water tank is connected with the drain pipe.
4. The eel culture wastewater treatment system according to claim 1, wherein: the front of the oxidation device also comprises an eel culture sewage regulating tank which is used for regulating water quantity and balancing water quality.
5. The eel culture wastewater treatment system according to claim 1, wherein: the adsorption filler filled in the filtering adsorption tower is special filler for iron-based oxyhydroxide phosphorus adsorption.
6. The eel culture wastewater treatment system according to claim 1, wherein: the supporting filler filled in the filtering adsorption tower/barrel is smooth stone.
7. The eel culture sewage treatment method is characterized by comprising the following steps of:
(1) Oxidation of eel culture sewage: collecting eel culture sewage to be treated in a sewage regulating tank, pumping the sewage into an oxidation device by a sewage lifting pump, adding 10-12% commodity sodium hypochlorite according to 50-200 ml/L, uniformly mixing the sewage by a pipeline mixer, and allowing the sewage to enter a reaction tank (tank) for oxidation reaction to oxidize ammonia nitrogen in the sewage into nitrogen;
(2) Filtering, adsorbing and dephosphorizing eel culture sewage: opening an eluent water inlet valve and a backwash water outlet valve, closing the backwash water inlet valve and the backwash water outlet valve, enabling eel culture sewage oxidized in the step (1) to enter a filtering adsorption tower (barrel), enabling the sewage to flow out from bottom to top, enabling phosphate anions in the sewage to be adsorbed by an adsorbent so as to remove phosphorus in the sewage, and discharging clear water after phosphorus removal into a natural water body after metering through a water outlet and an outlet valve of the filtering adsorption tower/barrel;
the filter adsorption tower/barrel is filled with a special filler for phosphorus adsorption, the special filler for phosphorus adsorption is iron oxyhydroxide, has extremely strong selective adsorption capacity for phosphorus in neutral water, and can rapidly desorb the adsorbed phosphorus when the pH value is changed into strong alkali. The total phosphorus in the effluent is less than or equal to 0.1mg/L, and the phosphorus removal rate is 95 to 99.5 percent;
(3) The method is that a backwash liquid water inlet valve and a backwash liquid water outlet valve are opened, an eluent water inlet valve and an eluent water outlet valve are closed, 2-10% sodium hydroxide solution stored in a backwash liquid storage tank is pumped into a filtering adsorption tower/barrel through a backwash pump for repeated cleaning, so that the phosphate radical adsorbed in the adsorption filler is converted into sodium phosphate to flow out and is stored in a backwash desorption liquid storage tank;
(4) When the adsorption saturation of phosphorus reaches 80-90%, a desorption liquid delivery pump is started to measure a dosing pump, and the phosphorus adsorption filling is cleaned, so that phosphate adsorbed in the filling is desorbed and flows out along with elution to be stored in a phosphorus sedimentation tank; after the desorption is completed, washing the mixture to be neutral by using clear water, and thus completing the regeneration of the adsorption filling; the eluent is 1-5% sodium hydroxide solution;
the method for recovering phosphorus in the backwash desorption liquid by the phosphorus recovery device comprises the steps of pumping the backwash desorption liquid stored in a backwash desorption liquid storage tank into a phosphorus recovery reaction tank, adding a phosphorus precipitant to enable phosphate radicals in the recovery liquid to react with calcium ions to generate calcium phosphate precipitates, and obtaining recovered calcium phosphate through precipitation separation and drying;
pumping the phosphorus eluent stored in a phosphorus recovery liquid storage tank into a precipitation reaction tank, starting a dosing pump, pumping the calcium hydroxide saturated solution stored in a phosphorus precipitant storage tank into the reaction tank to react to generate calcium phosphate precipitate, and pumping the calcium phosphate precipitate into a phosphorus precipitation tank to precipitate, wherein the precipitate is recovered calcium phosphate;
the phosphorus precipitant is a clarified saturated calcium hydroxide solution or a 5-25% calcium chloride solution.
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