CN115947454A - Method for efficiently and biologically denitrifying and deodorizing pig-raising wastewater based on anaerobic ammonia oxidation - Google Patents
Method for efficiently and biologically denitrifying and deodorizing pig-raising wastewater based on anaerobic ammonia oxidation Download PDFInfo
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Abstract
The invention discloses a method for efficiently and biologically denitrifying and deodorizing pig-raising wastewater based on anaerobic ammonia oxidation, which comprises the steps of conveying the pig-raising wastewater into an anaerobic reaction tank for reaction, wherein a filler containing anaerobic ammonia oxidizing bacteria is arranged in the anaerobic reaction tank, sludge and supernatant are obtained through reaction, and the supernatant is pumped into a next process tank for shortcut nitrification and denitrification; the components of the filler comprise: iron-lignin complex, sodium alginate/chitosan microspheres and sodium propionate. The invention optimizes the biological denitrification reaction process, obviously reduces the COD concentration and the ammonia nitrogen concentration of the treated effluent compared with the traditional method, and has good denitrification and deodorization effects.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a method for efficiently and biologically denitrifying and deodorizing pig wastewater based on anaerobic ammonia oxidation.
Background
Pig, beef and mutton are important vegetable basket products for urban and rural residents in China, in recent years, china increases the agricultural development strength, pork is used as an important strategic material, the next step of capacity increase is continued, a large amount of excrement and urine is produced in the live pig breeding process, if the pig is not treated, the pig is discharged into the environment, and the ecological environments such as surface water quality, soil and the like are seriously influenced; the live pig breeding wastewater has the characteristics of low carbon-nitrogen ratio, large water quality and quantity fluctuation and the like, so that the difficulty of wastewater treatment is further increased; meanwhile, live pig breeding enterprises have large market volatility, so the anaerobic ammonia oxidation technology, which is an environment-friendly technology with low investment cost and low operating cost, is an urgent need technology for the live pig breeding enterprises.
The anaerobic ammonia oxidation process has the following advantages: 1. deamination is realized in the anaerobic process, so that the aerobic aeration oxygen demand is saved, and energy conservation and emission reduction are realized; 2. the aerobic ammonia nitrogen load is reduced, the adding amount of alkali is saved, the adding amount of a medicament is saved, and the operating cost is saved; 3. the volume of an aerobic system is reduced, and one-time investment and construction cost is saved; 4. and an additional carbon source is not required to be added, so that the adding of the medicament is further saved, and the operating cost is saved.
Disclosure of Invention
The invention provides a method for efficiently and biologically denitrifying and deodorizing pig wastewater based on anaerobic ammonia oxidation, which comprises the following steps: conveying the pig raising wastewater into an anaerobic reaction tank for reaction, wherein a filler containing anaerobic ammonium oxidation bacteria is arranged in the anaerobic reaction tank, sludge and supernatant are obtained through reaction, and the supernatant is pumped into a next process tank for shortcut nitrification and denitrification; the components of the filler comprise: the iron-lignin composite comprises an iron-lignin composite, sodium alginate/chitosan microspheres and sodium propionate, wherein the preparation method of the iron-lignin composite comprises the following steps:
(1) Preparing an aqueous solution of lignosulfonate and an aqueous solution of sodium borohydride in ethanol, adding ferrous chloride into the aqueous solution of lignosulfonate, and stirring the solution for 8-10 hours after the addition is finished; then dropwise adding the ethanol water solution of sodium borohydride into the solution under the stirring state until no bubbles are generated, filtering to obtain filtrate and a solid phase, and washing and drying the solid phase by deionized water to obtain a solid phase A;
(2) Adding ferric chloride into the filtrate, and stirring the solution for 40-60 min after the addition is finished; after stirring, carrying out reduced pressure concentration, and evaporating the solution to obtain a solid phase B;
(3) And mixing the solid phase A and the solid phase B to obtain the iron-lignin complex.
The preparation method of the sodium alginate/chitosan microspheres comprises the following steps: preparing an aqueous solution of sodium alginate, preparing an aqueous solution of chitosan-acetic acid, adding calcium chloride into the aqueous solution of chitosan-acetic acid, stirring the solution for 20-30 min, then dropwise adding the aqueous solution of sodium alginate into the aqueous solution of chitosan-acetic acid under a stirring state, quickly stirring the solution for more than 20min after the addition is finished, then carrying out solid-liquid separation, washing a solid phase with deionized water, and drying to obtain the sodium alginate/chitosan microspheres.
Further, the filler comprises the following components in parts by weight: 20-30 parts of iron-lignin compound, 6-15 parts of sodium alginate/chitosan microspheres and 1-3 parts of sodium propionate.
Further, in the aqueous solution of lignosulfonate, the concentration of lignosulfonate is 6-10 g/L, in the aqueous solution of sodium borohydride, the volume fraction of ethanol is 40-50%, and the concentration of sodium borohydride is 10-16 g/L.
Further, the volume ratio of the added mass of the ferrous chloride to the aqueous solution of the lignosulfonate is that the ferrous chloride/the aqueous solution of the lignosulfonate = 20-30 g/L.
Further, in the step (2), the mass ratio of the added iron chloride to the mass of the lignosulfonate used for preparing the aqueous solution of lignosulfonate is iron chloride: lignosulfonate = 1.
Further, the mass percent of sodium alginate in the sodium alginate aqueous solution is 2%, the mass percent of chitosan in the chitosan-acetic acid aqueous solution is 0.2-0.3%, and the mass percent of acetic acid is 1-2%.
Further, the mass of the added calcium chloride is 1/50 of the mass of the aqueous solution of the chitosan-acetic acid.
Further, dropwise adding the aqueous solution of sodium alginate into the aqueous solution of chitosan-acetic acid according to the mass ratio of the aqueous solution of chitosan-acetic acid: aqueous solution of sodium alginate =2 to 3.
Therefore, the beneficial effects of the invention are as follows: the invention optimizes the biological denitrification reaction process, obviously reduces the COD concentration and the ammonia nitrogen concentration of the treated effluent compared with the traditional method, and has good denitrification and deodorization effects.
Detailed Description
The following is a detailed description with reference to examples:
example 1
A method for efficiently and biologically denitrifying and deodorizing pig wastewater based on anaerobic ammonia oxidation comprises the following steps: conveying the pig raising wastewater into an anaerobic reaction tank for reaction, wherein a filler containing anaerobic ammonium oxidation bacteria is arranged in the anaerobic reaction tank, sludge and supernatant are obtained through reaction, and the supernatant is pumped into a next process tank for shortcut nitrification and denitrification; the components of the filler comprise: the iron-lignin composite comprises an iron-lignin composite, sodium alginate/chitosan microspheres and sodium propionate, wherein the iron-lignin composite comprises the following components in parts by weight: 20 parts of iron-lignin compound, 6 parts of sodium alginate/chitosan microspheres and 1 part of sodium propionate.
The preparation method of the iron-lignin compound comprises the following steps:
(1) Preparing an aqueous solution of lignosulfonate and an aqueous ethanol solution of sodium borohydride, wherein the concentration of the lignosulfonate in the aqueous solution of lignosulfonate is 6g/L, the volume fraction of ethanol in the aqueous ethanol solution of sodium borohydride is 40%, and the concentration of the sodium borohydride is 10g/L; adding ferrous chloride into the aqueous solution of the lignosulfonate, wherein the ratio of the added mass of the ferrous chloride to the volume of the aqueous solution of the lignosulfonate is that the ferrous chloride/the aqueous solution of the lignosulfonate =20g/L; stirring the solution for 8 hours at a speed of 50r/min after the feeding is finished; then dropwise adding the ethanol water solution of sodium borohydride into the solution under the stirring state until no bubbles are generated, filtering to obtain filtrate and a solid phase, and washing and drying the solid phase by deionized water to obtain a solid phase A;
(2) Adding ferric chloride into the filtrate, wherein the mass ratio of the added ferric chloride to the lignosulfonate used for preparing the aqueous solution of lignosulfonate is ferric chloride: lignosulfonate = 1; stirring the solution for 50min at a speed of 40r/min after the feeding is finished; after stirring, carrying out reduced pressure concentration, and evaporating the solution to obtain a solid phase B;
(3) And mixing the solid phase A and the solid phase B to obtain the iron-lignin complex.
The preparation method of the sodium alginate/chitosan microspheres comprises the following steps: preparing an aqueous solution of sodium alginate, and preparing an aqueous solution of chitosan-acetic acid, wherein the mass percent of sodium alginate in the aqueous solution of sodium alginate is 2%, the mass percent of chitosan in the aqueous solution of chitosan-acetic acid is 0.2%, and the mass percent of acetic acid in the aqueous solution of chitosan-acetic acid is 1%; adding calcium chloride into the aqueous solution of the chitosan-acetic acid, wherein the mass of the added calcium chloride is 1/50 of that of the aqueous solution of the chitosan-acetic acid; stirring the solution for 20min at the speed of 50r/min, then dropwise adding the sodium alginate aqueous solution into the chitosan-acetic acid aqueous solution under the stirring state, and dropwise adding the sodium alginate aqueous solution into the chitosan-acetic acid aqueous solution according to the mass ratio of the chitosan-acetic acid aqueous solution: aqueous solution of sodium alginate = 2; and (3) rapidly stirring the solution for 20min at a speed of 100r/min after the addition is finished, then carrying out solid-liquid separation, washing a solid phase by using deionized water, and drying to obtain the sodium alginate/chitosan microspheres.
Example 2
A method for efficiently and biologically denitrifying and deodorizing pig wastewater based on anaerobic ammonia oxidation comprises the following steps: conveying the pig raising wastewater into an anaerobic reaction tank for reaction, wherein a filler containing anaerobic ammonium oxidation bacteria is arranged in the anaerobic reaction tank, treated sludge and supernatant are obtained through reaction, and the supernatant is pumped into a next process tank for shortcut nitrification and denitrification; the components of the filler comprise: the iron-lignin composite comprises an iron-lignin composite, sodium alginate/chitosan microspheres and sodium propionate, wherein the iron-lignin composite comprises the following components in parts by weight: 24 parts of iron-lignin compound, 10 parts of sodium alginate/chitosan microspheres and 2 parts of sodium propionate.
The preparation method of the iron-lignin compound comprises the following steps:
(1) Preparing an aqueous solution of lignosulfonate and an aqueous ethanol solution of sodium borohydride, wherein the concentration of the lignosulfonate in the aqueous solution of lignosulfonate is 8g/L, the volume fraction of ethanol in the aqueous ethanol solution of sodium borohydride is 40%, and the concentration of the sodium borohydride is 12g/L; adding ferrous chloride into the aqueous solution of the lignosulfonate, wherein the ratio of the added mass of the ferrous chloride to the volume of the aqueous solution of the lignosulfonate is that the ferrous chloride/the aqueous solution of the lignosulfonate =20g/L; stirring the solution for 8 hours at a speed of 50r/min after the feeding is finished; then dropwise adding the ethanol water solution of sodium borohydride into the solution under the stirring state until no bubbles are generated, filtering to obtain filtrate and a solid phase, and washing and drying the solid phase by deionized water to obtain a solid phase A;
(2) Adding ferric chloride into the filtrate, wherein the mass ratio of the added ferric chloride to the lignosulfonate used for preparing the aqueous solution of lignosulfonate is ferric chloride: lignosulfonate = 1; stirring the solution for 50min at a speed of 40r/min after the feeding is finished; after stirring, carrying out reduced pressure concentration, and evaporating the solution to obtain a solid phase B;
(3) And mixing the solid phase A and the solid phase B to obtain the iron-lignin complex.
The preparation method of the sodium alginate/chitosan microspheres comprises the following steps: preparing an aqueous solution of sodium alginate, and preparing an aqueous solution of chitosan-acetic acid, wherein the mass percent of sodium alginate in the aqueous solution of sodium alginate is 2%, the mass percent of chitosan in the aqueous solution of chitosan-acetic acid is 0.2%, and the mass percent of acetic acid in the aqueous solution of chitosan-acetic acid is 1%; adding calcium chloride into the aqueous solution of the chitosan-acetic acid, wherein the mass of the added calcium chloride is 1/50 of that of the aqueous solution of the chitosan-acetic acid; stirring the solution for 20min at the speed of 50r/min, then dropwise adding the sodium alginate aqueous solution into the chitosan-acetic acid aqueous solution under the stirring state, and dropwise adding the sodium alginate aqueous solution into the chitosan-acetic acid aqueous solution according to the mass ratio of the chitosan-acetic acid aqueous solution: aqueous solution of sodium alginate = 2; and (3) rapidly stirring the solution for 20min at a speed of 100r/min after the addition is finished, then carrying out solid-liquid separation, washing a solid phase by using deionized water, and drying to obtain the sodium alginate/chitosan microspheres.
Example 3
A method for efficiently and biologically denitrifying and deodorizing pig wastewater based on anaerobic ammonia oxidation comprises the following steps: conveying the pig raising wastewater into an anaerobic reaction tank for reaction, wherein a filler containing anaerobic ammonium oxidation bacteria is arranged in the anaerobic reaction tank, sludge and supernatant are obtained through reaction, and the supernatant is pumped into a next process tank for shortcut nitrification and denitrification; the components of the filler comprise: the iron-lignin composite comprises an iron-lignin composite, sodium alginate/chitosan microspheres and sodium propionate, wherein the iron-lignin composite comprises the following components in parts by weight: 27 parts of iron-lignin compound, 13 parts of sodium alginate/chitosan microspheres and 2 parts of sodium propionate.
The preparation method of the iron-lignin compound comprises the following steps:
(1) Preparing an aqueous solution of lignosulfonate and an aqueous ethanol solution of sodium borohydride, wherein the concentration of the lignosulfonate in the aqueous solution of lignosulfonate is 8g/L, the volume fraction of ethanol in the aqueous ethanol solution of sodium borohydride is 50%, and the concentration of the sodium borohydride is 14g/L; adding ferrous chloride into the aqueous solution of the lignosulfonate, wherein the ratio of the added mass of the ferrous chloride to the volume of the aqueous solution of the lignosulfonate is that the ferrous chloride/the aqueous solution of the lignosulfonate =30g/L; stirring the solution for 8 hours at a speed of 50r/min after the feeding is finished; then dropwise adding the ethanol water solution of sodium borohydride into the solution under the stirring state until no bubbles are generated, filtering to obtain filtrate and a solid phase, and washing and drying the solid phase by deionized water to obtain a solid phase A;
(2) Adding ferric chloride into the filtrate, wherein the mass ratio of the added ferric chloride to the lignosulfonate used for preparing the aqueous solution of lignosulfonate is ferric chloride: lignosulfonate = 1; stirring the solution for 50min at a speed of 40r/min after the feeding is finished; after stirring, carrying out reduced pressure concentration, and evaporating the solution to obtain a solid phase B;
(3) And mixing the solid phase A and the solid phase B to obtain the iron-lignin complex.
The preparation method of the sodium alginate/chitosan microspheres comprises the following steps: preparing an aqueous solution of sodium alginate, and preparing an aqueous solution of chitosan-acetic acid, wherein the mass percent of sodium alginate in the aqueous solution of sodium alginate is 2%, the mass percent of chitosan in the aqueous solution of chitosan-acetic acid is 0.3%, and the mass percent of acetic acid is 2%; adding calcium chloride into the aqueous solution of the chitosan-acetic acid, wherein the mass of the added calcium chloride is 1/50 of that of the aqueous solution of the chitosan-acetic acid; stirring the solution for 20min at the speed of 50r/min, then dropwise adding the sodium alginate aqueous solution into the chitosan-acetic acid aqueous solution under the stirring state, and dropwise adding the sodium alginate aqueous solution into the chitosan-acetic acid aqueous solution according to the mass ratio of the chitosan-acetic acid aqueous solution: aqueous solution of sodium alginate = 3; and (3) rapidly stirring the solution for 20min at a speed of 100r/min after the addition is finished, then carrying out solid-liquid separation, washing a solid phase by using deionized water, and drying to obtain the sodium alginate/chitosan microspheres.
Example 4
A method for efficiently and biologically denitrifying and deodorizing pig wastewater based on anaerobic ammonia oxidation comprises the following steps: conveying the pig raising wastewater into an anaerobic reaction tank for reaction, wherein a filler containing anaerobic ammonium oxidation bacteria is arranged in the anaerobic reaction tank, sludge and supernatant are obtained through reaction, and the supernatant is pumped into a next process tank for shortcut nitrification and denitrification; the components of the filler comprise: the iron-lignin composite comprises an iron-lignin composite, sodium alginate/chitosan microspheres and sodium propionate, wherein the iron-lignin composite comprises the following components in parts by weight: 30 parts of iron-lignin compound, 15 parts of sodium alginate/chitosan microspheres and 3 parts of sodium propionate.
The preparation method of the iron-lignin compound comprises the following steps:
(1) Preparing a lignosulfonate water solution and a sodium borohydride ethanol water solution, wherein the lignosulfonate water solution has the lignosulfonate concentration of 10g/L, the sodium borohydride ethanol water solution has the ethanol volume fraction of 50% and the sodium borohydride concentration of 16g/L; adding ferrous chloride into the aqueous solution of the lignosulfonate, wherein the ratio of the added mass of the ferrous chloride to the volume of the aqueous solution of the lignosulfonate is that the ferrous chloride/the aqueous solution of the lignosulfonate =30g/L; stirring the solution for 8 hours at a speed of 50r/min after the feeding is finished; then dropwise adding the ethanol water solution of sodium borohydride into the solution under the stirring state until no bubbles are generated, filtering to obtain filtrate and a solid phase, and washing and drying the solid phase by deionized water to obtain a solid phase A;
(2) Adding ferric chloride into the filtrate, wherein the mass ratio of the added ferric chloride to the lignosulfonate used for preparing the aqueous solution of lignosulfonate is ferric chloride: lignosulfonate = 1; stirring the solution for 50min at 40r/min after the feeding is finished; after stirring, concentrating under reduced pressure, and evaporating the solution to dryness to obtain a solid phase B;
(3) And mixing the solid phase A and the solid phase B to obtain the iron-lignin complex.
The preparation method of the sodium alginate/chitosan microspheres comprises the following steps: preparing an aqueous solution of sodium alginate, and preparing an aqueous solution of chitosan-acetic acid, wherein the mass percent of sodium alginate in the aqueous solution of sodium alginate is 2%, the mass percent of chitosan in the aqueous solution of chitosan-acetic acid is 0.3%, and the mass percent of acetic acid is 2%; adding calcium chloride into the aqueous solution of the chitosan-acetic acid, wherein the mass of the added calcium chloride is 1/50 of that of the aqueous solution of the chitosan-acetic acid; stirring the solution for 20min at the speed of 50r/min, then dropwise adding the sodium alginate aqueous solution into the chitosan-acetic acid aqueous solution under the stirring state, and dropwise adding the sodium alginate aqueous solution into the chitosan-acetic acid aqueous solution according to the mass ratio of the chitosan-acetic acid aqueous solution: aqueous solution of sodium alginate = 3; and (3) rapidly stirring the solution for 20min at a speed of 100r/min after the addition is finished, then carrying out solid-liquid separation, washing a solid phase by using deionized water, and drying to obtain the sodium alginate/chitosan microspheres.
Comparative example 1
A method for comparison: conveying the pig raising wastewater into an anaerobic reaction tank for reaction, wherein a filler containing anaerobic ammonium oxidation bacteria is arranged in the anaerobic reaction tank, treated sludge and supernatant are obtained through reaction, and the supernatant is pumped into a next process tank for shortcut nitrification and denitrification; the components of the filler of this comparative example included: the sodium alginate/chitosan microspheres and the sodium propionate comprise the following components in parts by weight: 10 parts of sodium alginate/chitosan microspheres and 2 parts of sodium propionate.
The preparation method of the sodium alginate/chitosan microspheres comprises the following steps: preparing an aqueous solution of sodium alginate, and preparing an aqueous solution of chitosan-acetic acid, wherein the mass percent of sodium alginate in the aqueous solution of sodium alginate is 2%, the mass percent of chitosan in the aqueous solution of chitosan-acetic acid is 0.2%, and the mass percent of acetic acid is 1%; adding calcium chloride into the aqueous solution of the chitosan-acetic acid, wherein the mass of the added calcium chloride is 1/50 of that of the aqueous solution of the chitosan-acetic acid; stirring the solution for 20min at the speed of 50r/min, then dropwise adding the sodium alginate aqueous solution into the chitosan-acetic acid aqueous solution under the stirring state, and dropwise adding the sodium alginate aqueous solution into the chitosan-acetic acid aqueous solution according to the mass ratio of the chitosan-acetic acid aqueous solution: aqueous solution of sodium alginate = 2; and (3) rapidly stirring the solution for 20min at a speed of 100r/min after the addition is finished, then carrying out solid-liquid separation, washing a solid phase by using deionized water, and drying to obtain the sodium alginate/chitosan microspheres.
Comparative example 2
A method for comparison: conveying the pig raising wastewater into an anaerobic reaction tank for reaction, wherein a filler containing anaerobic ammonium oxidation bacteria is arranged in the anaerobic reaction tank, sludge and supernatant are obtained through reaction, and the supernatant is pumped into a next process tank for shortcut nitrification and denitrification; the components of the filler of this comparative example included: the iron-lignin compound and the sodium propionate comprise the following components in parts by weight: 24 parts of iron-lignin compound and 2 parts of sodium propionate.
The preparation method of the iron-lignin compound comprises the following steps:
(1) Preparing a lignosulfonate water solution and a sodium borohydride ethanol water solution, wherein the lignosulfonate water solution has the lignosulfonate concentration of 8g/L, the sodium borohydride ethanol water solution has the ethanol volume fraction of 40% and the sodium borohydride concentration of 12g/L; adding ferrous chloride into the aqueous solution of the lignosulfonate, wherein the ratio of the added mass of the ferrous chloride to the volume of the aqueous solution of the lignosulfonate is that the ferrous chloride/the aqueous solution of the lignosulfonate =20g/L; stirring the solution for 8 hours at a speed of 50r/min after the feeding is finished; then dropwise adding the ethanol water solution of sodium borohydride into the solution under the stirring state until no bubbles are generated, filtering to obtain filtrate and a solid phase, and washing and drying the solid phase by deionized water to obtain a solid phase A;
(2) Adding ferric chloride into the filtrate, wherein the mass ratio of the added ferric chloride to the lignosulfonate used for preparing the aqueous solution of lignosulfonate is ferric chloride: lignosulfonate = 1; stirring the solution for 50min at 40r/min after the feeding is finished; after stirring, concentrating under reduced pressure, and evaporating the solution to dryness to obtain a solid phase B;
(3) And mixing the solid phase A and the solid phase B to obtain the iron-lignin complex.
Comparative example 3
A method for comparison: conveying the pig raising wastewater into an anaerobic reaction tank for reaction, wherein a filler containing anaerobic ammonium oxidation bacteria is arranged in the anaerobic reaction tank, treated sludge and supernatant are obtained through reaction, and the supernatant is pumped into a next process tank for shortcut nitrification and denitrification; the components of the filler comprise: the iron-lignin composite comprises an iron-lignin composite, sodium alginate/chitosan microspheres and sodium propionate, wherein the iron-lignin composite comprises the following components in parts by weight: 24 parts of iron-lignin compound, 10 parts of sodium alginate/chitosan microspheres and 2 parts of sodium propionate.
The preparation method of the iron-lignin compound comprises the following steps: preparing a lignosulfonate water solution and a sodium borohydride ethanol water solution, wherein the lignosulfonate water solution has the lignosulfonate concentration of 8g/L, the sodium borohydride ethanol water solution has the ethanol volume fraction of 40% and the sodium borohydride concentration of 12g/L; adding ferrous chloride into the aqueous solution of the lignosulfonate, wherein the volume ratio of the added ferrous chloride to the aqueous solution of the lignosulfonate is that the ferrous chloride/the aqueous solution of the lignosulfonate =20g/L; stirring the solution for 8 hours at a speed of 50r/min after the feeding is finished; then, the aqueous ethanol solution of sodium borohydride was added dropwise to the solution under stirring until no bubble was generated, and filtration was performed to obtain a filtrate and a solid phase, and the solid phase was washed with deionized water and dried to obtain a solid phase a as the iron-lignin complex of the present comparative example.
The preparation method of the sodium alginate/chitosan microspheres comprises the following steps: preparing an aqueous solution of sodium alginate, and preparing an aqueous solution of chitosan-acetic acid, wherein the mass percent of sodium alginate in the aqueous solution of sodium alginate is 2%, the mass percent of chitosan in the aqueous solution of chitosan-acetic acid is 0.2%, and the mass percent of acetic acid in the aqueous solution of chitosan-acetic acid is 1%; adding calcium chloride into the aqueous solution of the chitosan-acetic acid, wherein the mass of the added calcium chloride is 1/50 of that of the aqueous solution of the chitosan-acetic acid; stirring the solution for 20min at the speed of 50r/min, then dropwise adding the sodium alginate aqueous solution into the chitosan-acetic acid aqueous solution under the stirring state, and dropwise adding the sodium alginate aqueous solution into the chitosan-acetic acid aqueous solution according to the mass ratio of the chitosan-acetic acid aqueous solution: aqueous solution of sodium alginate = 2; and (3) rapidly stirring the solution for 20min at a speed of 100r/min after the addition is finished, then carrying out solid-liquid separation, washing a solid phase by using deionized water, and drying to obtain the sodium alginate/chitosan microspheres.
Example 5
In the methods described in the above examples and comparative examples, the COD concentration and ammonia nitrogen concentration of the supernatant treated in the anaerobic reaction tank were measured. An anaerobic reaction tank without any filler is used as a control group (except that no filler is added, other condition parameters are the same as those in the example 2), the COD concentration in the test wastewater before treatment is 100mg/L, and the ammonia nitrogen concentration is 100mg/L; the results after the treatments of the respective examples and comparative examples are shown in table 1.
TABLE 1
| Test set | COD concentration (mg/L) | Ammonia nitrogen concentration (mg/L) |
| Control group | 85.3 | 61.8 |
| Example 1 | 66.6 | 21.0 |
| Example 2 | 65.9 | 20.7 |
| Example 3 | 66.1 | 21.3 |
| Example 4 | 66.4 | 21.9 |
| Comparative example 1 | 74.9 | 44.3 |
| Comparative example 2 | 76.3 | 49.2 |
| Comparative example 3 | 69.5 | 37.7 |
As can be seen from Table 1, after the prepared filler is added into the anaerobic reaction tank, the COD concentration and ammonia nitrogen concentration of treated effluent are both obviously reduced, which shows that the method is favorable for improving the sewage treatment effect. The filler prepared by the invention can promote the growth and distribution of the anammox bacteria, and the filler has a certain adsorption effect on pollutants in sewage, so that the denitrification reaction process is easier to carry out, and the denitrification and deodorization activities of the anammox bacteria are improved.
While the technical solutions provided by the present invention have been described in detail above, for a person skilled in the art, according to the ideas of the embodiments of the present invention, there may be changes in the specific implementation manners and application ranges, and in summary, the contents of the present specification should not be construed as limiting the present invention.
Claims (8)
1. A method for efficiently and biologically denitrifying and deodorizing pig wastewater based on anaerobic ammonia oxidation is characterized by comprising the following steps: conveying the pig raising wastewater into an anaerobic reaction tank for reaction, wherein a filler containing anaerobic ammonium oxidation bacteria is arranged in the anaerobic reaction tank, treated sludge and supernatant are obtained through reaction, and the supernatant is pumped into a next process tank for shortcut nitrification and denitrification; the components of the filler comprise: the iron-lignin composite comprises an iron-lignin composite, sodium alginate/chitosan microspheres and sodium propionate, wherein the preparation method of the iron-lignin composite comprises the following steps:
(1) Preparing an aqueous solution of lignosulfonate and an aqueous solution of sodium borohydride in ethanol, adding ferrous chloride into the aqueous solution of lignosulfonate, and stirring the solution for 8-10 hours after the addition is finished; then dropwise adding the ethanol water solution of sodium borohydride into the solution under the stirring state until no bubbles are generated, filtering to obtain filtrate and a solid phase, and washing and drying the solid phase by deionized water to obtain a solid phase A;
(2) Adding ferric chloride into the filtrate, and stirring the solution for 40-60 min after the addition is finished; after stirring, concentrating under reduced pressure, and evaporating the solution to dryness to obtain a solid phase B;
(3) Mixing the solid phase A and the solid phase B to obtain the iron-lignin compound;
the preparation method of the sodium alginate/chitosan microspheres comprises the following steps: preparing an aqueous solution of sodium alginate, preparing an aqueous solution of chitosan-acetic acid, adding calcium chloride into the aqueous solution of chitosan-acetic acid, stirring the solution for 20-30 min, then dropwise adding the aqueous solution of sodium alginate into the aqueous solution of chitosan-acetic acid under a stirring state, quickly stirring the solution for more than 20min after the addition is finished, then carrying out solid-liquid separation, washing the solid phase with deionized water, and drying to obtain the sodium alginate/chitosan microspheres.
2. The method for efficient biological denitrification and deodorization of swine wastewater based on anammox as claimed in claim 1, wherein the method comprises the following steps: the filler comprises the following components in parts by weight: 20-30 parts of iron-lignin compound, 6-15 parts of sodium alginate/chitosan microspheres and 1-3 parts of sodium propionate.
3. The method for efficient biological denitrification and deodorization of swine wastewater based on anammox as claimed in claim 1, wherein the method comprises the following steps: in the aqueous solution of the lignosulfonate, the concentration of the lignosulfonate is 6-10 g/L, in the aqueous solution of the sodium borohydride, the volume fraction of ethanol is 40-50%, and the concentration of the sodium borohydride is 10-16 g/L.
4. The method for the efficient biological denitrification and deodorization of swine wastewater based on anammox according to claim 3, wherein the method comprises the following steps: the volume ratio of the added mass of the ferrous chloride to the aqueous solution of the lignosulfonate is that the aqueous solution of the ferrous chloride/the lignosulfonate = 20-30 g/L.
5. The method for efficient biological denitrification and deodorization of swine wastewater based on anammox as claimed in claim 4, wherein: in the step (2), the mass ratio of the added ferric chloride to the lignosulfonate used for preparing the lignosulfonate aqueous solution is ferric chloride: lignosulfonate = 1.
6. The method for efficient biological denitrification and deodorization of swine wastewater based on anammox as claimed in claim 1, wherein the method comprises the following steps: the mass percent of sodium alginate in the sodium alginate aqueous solution is 2%, the mass percent of chitosan in the chitosan-acetic acid aqueous solution is 0.2-0.3%, and the mass percent of acetic acid is 1-2%.
7. The method for efficient biological denitrification and deodorization of swine wastewater based on anammox as claimed in claim 6, wherein: the adding mass of the calcium chloride is 1/50 of the mass of the aqueous solution of the chitosan-acetic acid.
8. The method for the efficient biological denitrification and deodorization of swine wastewater based on anammox according to claim 7, wherein the method comprises the following steps: and (2) dropwise adding the aqueous solution of sodium alginate into the aqueous solution of chitosan-acetic acid in a mass ratio of the aqueous solution of chitosan-acetic acid: aqueous solution of sodium alginate =2 to 3.
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