CN108358311B - Method for enhancing wastewater anaerobic biological phosphorus removal by biochar coupling micro-current - Google Patents
Method for enhancing wastewater anaerobic biological phosphorus removal by biochar coupling micro-current Download PDFInfo
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- CN108358311B CN108358311B CN201810100234.1A CN201810100234A CN108358311B CN 108358311 B CN108358311 B CN 108358311B CN 201810100234 A CN201810100234 A CN 201810100234A CN 108358311 B CN108358311 B CN 108358311B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2813—Anaerobic digestion processes using anaerobic contact processes
Abstract
The invention discloses a method for enhancing the phosphorus removal of wastewater anaerobes by biochar coupling micro-current, belonging to the technical field of wastewater treatment; according to the method, anaerobic sludge of an urban sewage treatment plant is inoculated into phosphorus-containing wastewater to be treated, then biochar is added, the mixture is stirred and uniformly mixed, the pH value of the wastewater is adjusted, the current intensity of a reaction system is controlled through an external voltage-stabilizing constant-current power supply, and anaerobic digestion is carried out at 15-35 ℃; under the action of biochar coupled micro-current, the anaerobic microorganisms convert phosphate into gaseous hydrogen phosphide to escape from a water body, so that the total phosphorus content entering a subsequent biochemical unit is reduced, and the biological phosphorus removal effect of the anaerobic-anoxic-aerobic biochemical treatment system is obviously improved.
Description
Technical Field
The invention relates to a method for enhancing the phosphorus removal of anaerobic organisms in wastewater by biochar coupling micro-current, belonging to the technical field of wastewater treatment.
Background
In recent years, the production and consumption of chemical fertilizers, pesticides and phosphorus-containing detergents in China are rapidly increased, the eutrophication of water bodies caused by phosphorus pollution is becoming serious, and the 'water bloom' and the 'red tide' near the sea in lakes occur and become more and more severe. The eutrophication of water body has already endangered agriculture and fishery, and simultaneously has great threat to the drinking water sanitation and food safety. The control of phosphorus pollution mainly adopts chemical methods and biological methods. Chemical agents are required to be added in the chemical phosphorus removal method, a large amount of chemical sludge is generated, and the treatment cost is quite expensive; in contrast, the biological phosphorus removal process is more economical. The traditional biological phosphorus removal process is based on the principles of anaerobic phosphorus release and aerobic phosphorus absorption of phosphorus-accumulating bacteria, and finally realizes the removal of phosphorus in a water body through sludge discharge.
At present, phosphorus removal is still a hotspot and difficulty in the water treatment industry, the development of new technologies is concerned, and new technologies such as denitrifying phosphorus removal, enhanced biological phosphorus removal and the like are continuously emerging. The prior patent application CN 104828939A discloses a method for producing phosphine by multistage phosphorus removal of phosphorus-containing organic wastewater, which comprises an anaerobic reactor, a microbial fuel cell and a microbial electrolytic cell which are sequentially connected, and the multistage phosphorus removal and the phosphine production are realized through two reaction units of anaerobic fermentation and the microbial electrolytic cell, so that the phosphorus removal efficiency is improved, the purity of the produced phosphine is higher, the process is complicated, and the regulation and control of system parameters are difficult. The prior patent application CN 106365309A discloses a method for removing phosphorus and recovering phosphorus from phosphorus-containing sewage by anaerobic organisms, which achieves the aim of removing phosphorus by controlling the organic load of a sewage system and enriching phosphate reducing bacteria by the phosphorus load and converting phosphate in the sewage into phosphine by utilizing the phosphate reducing bacteria; phosphine is a gaseous form of phosphorus circulation, and wastewater phosphorus removal is realized through the release of gaseous phosphine, and the research is increasingly paid attention to; no phosphorus removal process disclosure related to the present application is known.
Disclosure of Invention
The invention provides a method for strengthening wastewater anaerobic biological phosphorus removal by biochar coupling micro-current, which is based on the principle of microorganism anaerobic metabolism, adopts a biochar coupling micro-current mode to promote phosphate in a water body to obtain electrons more easily so as to be converted into phosphine, and escapes from the water body to improve the biological phosphorus removal effect of the wastewater; the biochar can be prepared from waste biomass, can realize resource utilization of biomass waste while efficiently removing phosphorus biologically, and has obvious environmental, social and economic benefits.
The technical content of the invention is as follows:
(1) inoculating sludge in an anaerobic tank of an urban sewage treatment plant into an anaerobic reactor containing phosphorus-containing wastewater to be treated, wherein the sludge concentration (MLSS) of mixed liquor in the anaerobic reactor is 3000-7000 mg/L, then adding biochar, and stirring to uniformly mix the biochar;
(2) adjusting the pH value of the mixture in the anaerobic reactor in the step (1) to 6.5-7.5, then placing an inert positive electrode plate and an inert negative electrode plate in the anaerobic reactor, and controlling the current intensity to be 30-80 mA by an external voltage-stabilizing constant-current power supply;
(3) and (3) carrying out anaerobic digestion on the mixture in the anaerobic reactor in the step (2) at 15-35 ℃, continuously introducing nitrogen from the bottom of the anaerobic reactor, releasing phosphine by anaerobic microorganisms under the action of biochar coupling micro-current and escaping with carrier gas, reducing the total phosphorus content in the original wastewater, and realizing the dephosphorization of the wastewater.
In the step (1), the biochar is one or more of coconut shell biochar, corn straw biochar and bamboo scrap biochar; the biochar is prepared by placing a biomass material in a muffle furnace, heating to 500-700 ℃ at a speed of 15-25 ℃/min under the condition of taking nitrogen as protective gas, carbonizing for 2-3 h, cooling to near room temperature, soaking for 30min by using 0.1-0.3 mol/L HCl, washing by using deionized water until washing liquor is neutral, and drying at 80 ℃ until constant weight is achieved.
The adding amount of the biochar in the step (1) is 0.5-1.5 kg/m3And treating the phosphorus-containing wastewater.
And (4) in the step (3), the anaerobic digestion time is 36-72 h.
The flow rate of nitrogen introduced in the step (3) is 2 multiplied by 10-3 ~4×10-3 m/s。
The invention has the following advantages:
1) the invention releases the phosphine through the anaerobic reactor to obviously reduce the total phosphorus of the mixed waste liquid, thereby realizing the purpose of removing phosphorus by anaerobic organisms in the waste water; compared with the traditional biological phosphorus removal process of anaerobic phosphorus release, aerobic phosphorus absorption and sludge discharge, the process has the advantages of simple process, short period and obvious phosphorus removal effect;
2) the biochar prepared by using biomass waste materials such as coconut shells, corn straws and the like has the characteristics of moderate specific gravity, good deodorization effect, more electronegative functional groups and the like, and has no biological toxic or side effect;
3) under the condition of biochar coupling micro-current, the electron donor reduced by phosphate is more sufficient, and the consumption of a carbon source is reduced; the biological carbon mediation further enhances the phosphate electron obtaining capability, and the wastewater anaerobic biological phosphorus removal effect is more obvious.
Detailed Description
The present invention is described in detail with reference to the following specific examples, which are carried out on the premise of the technical solution of the present invention, and the detailed implementation manner and the specific operation process are given, but the protection scope of the present invention is not limited to the contents.
Example 1
Inoculating sludge in an anaerobic tank of an urban sewage treatment plant into phosphorus-containing wastewater, wherein the sludge concentration of mixed liquor in an anaerobic reactor is 5060 mg/L; after the mixture is subjected to ultrasonic crushing, the total phosphorus concentration of the mixture is measured to be 520 mg/L; with coconutTaking shell as raw material, heating to 700 deg.C at 15 deg.C/min in muffle furnace under nitrogen as protective gas, carbonizing for 2 hr, cooling to near room temperature, soaking the obtained carbon-based material in 0.3mol/L HCl for 2 hr, washing with deionized water until the washing liquid is neutral, oven drying at 80 deg.C to constant weight to obtain coconut shell charcoal, wherein the adding amount of charcoal is 1.5kg/m3Phosphorus-containing wastewater to be treated;
adding coconut shell biochar into the inoculated wastewater, uniformly stirring, adjusting the pH value to 7.0, then placing inert positive and negative electrode plates into a reactor, and adjusting the output voltage of an external voltage-stabilizing constant-current power supply to stably maintain the current intensity in the reactor at a 60mA level; placing the anaerobic reactor in a constant-temperature water bath shaking table at 25 ℃, sealing the reactor, and controlling the flow rate to be 4 multiplied by 10-3 m/s, continuously blowing nitrogen from the bottom of the reactor through an air inlet pipe, and discharging generated phosphine along with carrier gas through an air outlet pipe; after 72h of anaerobic digestion, the total phosphorus content in the digestive juice was determined.
Meanwhile, setting a blank control of conventional anaerobic digestion of sludge without adding biochar and external micro-current, wherein the blank control is consistent with the working conditions of the experimental group; after 72 hours of anaerobic digestion, the total phosphorus removal rates of the blank group and the test group are respectively 10.5 percent and 28.6 percent, and the phosphorus removal effect of the biochar coupled micro-current anaerobic biochemical reaction system is good.
Example 2
Inoculating sludge in an anaerobic tank of an urban sewage treatment plant to phosphorus-containing wastewater, wherein the concentration of the sludge in mixed liquor in an anaerobic reactor is 6960mg/L, and the total phosphorus concentration is 670 mg/L; heating bamboo scraps as raw materials in a muffle furnace at a speed of 20 ℃/min to 600 ℃ under the condition of taking nitrogen as protective gas, carbonizing for 2.5h, cooling to near room temperature, soaking the obtained carbon-based material in 0.2mol/L HCl for 2h, washing with deionized water until the washing liquid is neutral, and drying at 80 ℃ to constant weight to obtain the bamboo scrap biochar, wherein the adding amount of the biochar is 1.0kg/m3Phosphorus-containing wastewater to be treated;
adding bamboo sawdust biochar into the inoculated wastewater, uniformly stirring and adjusting the pH value to 7.5, and stably maintaining the current intensity in the reactor at 50 mA; placing the reactor in a 35 deg.C constant temperature water bath shaking table, sealing the reactor, and controlling the flow rate at 3 × 10-3 m/s, continuously blowing nitrogen from the bottom of the reactor through an air inlet pipe, and discharging generated phosphine along with carrier gas through an air outlet pipe; after anaerobic digestion for 60h, the total phosphorus content in the digestive juice is determined.
Setting a blank control of conventional sludge anaerobic digestion without adding biochar and external micro-current, wherein the blank control is consistent with the working condition of a test group; after anaerobic digestion is carried out for 60 hours, the total phosphorus removal rates of the blank group and the test group are respectively 9.7 percent and 25.2 percent, and the phosphorus removal effect of the biochar coupled micro-current anaerobic biochemical reaction system is good.
Example 3
Inoculating sludge in an anaerobic tank of an urban sewage treatment plant to phosphorus-containing wastewater, wherein the concentration of the sludge in mixed liquor in an anaerobic reactor is 3120mg/L, and the total phosphorus concentration is 426 mg/L; taking a mixture of bamboo scraps and corn straws (the mass ratio is 1: 1) as a raw material, heating to 500 ℃ at a speed of 25 ℃/min in a muffle furnace under the condition of taking nitrogen as protective gas, carbonizing for 3 hours, cooling to near room temperature, soaking the obtained carbon-based material for 2 hours by using 0.1mol/L HCl, washing by using deionized water until the washing liquid is neutral, and drying to constant weight at a temperature of 80 ℃ to obtain biochar, wherein the adding amount of the biochar is 0.5kg/m3Phosphorus-containing wastewater to be treated;
adding biochar into the inoculated wastewater, uniformly stirring and adjusting the pH value to 6.5, and stably maintaining the current intensity in the reactor at 30 mA; placing the reactor in a 15 deg.C constant temperature water bath shaking table, sealing the reactor, and controlling the flow rate at 2 × 10-3 m/s, continuously blowing nitrogen from the bottom of the reactor through an air inlet pipe, and discharging generated phosphine along with carrier gas through an air outlet pipe; after anaerobic digestion for 36h, the total phosphorus content in the digestive juice was determined.
And setting a blank control of conventional sludge anaerobic digestion without adding biochar and external micro-current, wherein the blank control is consistent with the working condition of the test group. After anaerobic digestion is carried out for 36 hours, the total phosphorus removal rates of the blank group and the test group are respectively 4.2 percent and 19.1 percent, and the phosphorus removal effect of the biochar coupled micro-current anaerobic biochemical reaction system is good.
Example 4
Inoculating sludge in an anaerobic tank of an urban sewage treatment plant to phosphorus-containing wastewater, wherein the sludge concentration of mixed liquor in the anaerobic reactor is 4230mg/L, and the total phosphorus concentration is487 mg/L; taking a mixture of coconut shells and bamboo dust (the mass ratio is 1: 2) as a raw material, heating to 700 ℃ at a speed of 25 ℃/min in a muffle furnace under the condition of taking nitrogen as protective gas, carbonizing for 2h, cooling to near room temperature, soaking the obtained carbon-based material for 2h by using 0.25mol/L HCl, washing by using deionized water until the washing liquid is neutral, and drying to constant weight at a temperature of 80 ℃ to obtain biochar, wherein the adding amount of the biochar is 1.5kg/m3Phosphorus-containing wastewater to be treated;
adding biochar into the inoculated wastewater, uniformly stirring and adjusting the pH value to 6.5, and stably maintaining the current intensity in the reactor at 80 mA; placing the reactor in a 30 deg.C constant temperature water bath shaking table, sealing the reactor, and controlling the flow rate at 3.5 × 10-3 m/s, continuously blowing nitrogen from the bottom of the reactor through an air inlet pipe, and discharging generated phosphine along with carrier gas through an air outlet pipe; after 48h of anaerobic digestion, the total phosphorus content in the digestive juice was determined.
Setting a blank control of conventional sludge anaerobic digestion without adding biochar and external micro-current, wherein the blank control is consistent with the working condition of a test group; after 48 hours of anaerobic digestion, the total phosphorus removal rates of the blank group and the test group are respectively 11.9 percent and 31.3 percent, and the phosphorus removal effect of the biochar coupled micro-current anaerobic biochemical reaction system is good.
Example 5
Inoculating sludge in an anaerobic tank of an urban sewage treatment plant to the phosphorus-containing wastewater, wherein the concentration of the sludge in the mixed liquor in the anaerobic reactor is 6070mg/L, and the total phosphorus concentration is 568 mg/L. Taking a mixture of coconut shells and corn straws (the mass ratio is 3: 1) as a raw material, heating to 600 ℃ at 18 ℃/min in a muffle furnace under the condition of taking nitrogen as protective gas, carbonizing for 3h, cooling to near room temperature, soaking the obtained carbon-based material in 0.15mol/L HCl for 2h, washing with deionized water until the washing liquid is neutral, and drying at 80 ℃ to constant weight to obtain biochar, wherein the adding amount of the biochar is 0.8kg/m3Phosphorus-containing wastewater to be treated;
adding biochar into the inoculated wastewater, uniformly stirring and adjusting the pH value to 6.8, and stably maintaining the current intensity in the reactor at 50 mA; placing the reactor in a constant-temperature water bath shaking table at 20 ℃, sealing the reactor, and controlling the flow rate to be 2.5 multiplied by 10-3 m/s nitrogen is held from the bottom of the reactor through an air inlet pipeContinuously blowing in, and discharging the generated phosphine through an outlet pipe along with the carrier gas; after anaerobic digestion for 60h, the total phosphorus content in the digestive juice is determined.
Setting a blank control of conventional sludge anaerobic digestion without adding biochar and external micro-current, wherein the blank control is consistent with the working condition of a test group; after anaerobic digestion is carried out for 60 hours, the total phosphorus removal rates of the blank group and the test group are respectively 8.4 percent and 23.8 percent, and the phosphorus removal effect of the biochar coupled micro-current anaerobic biochemical reaction system is good.
Claims (4)
1. A method for enhancing anaerobic biological phosphorus removal of wastewater by biochar coupling micro-current is characterized by comprising the following steps:
(1) inoculating sludge in an anaerobic tank of an urban sewage treatment plant into an anaerobic reactor containing phosphorus-containing wastewater to be treated, wherein the concentration of the sludge in mixed liquor in the anaerobic reactor is 3000-7000 mg/L, then adding biochar, and stirring to uniformly mix the biochar;
(2) adjusting the pH value of the mixture in the anaerobic reactor in the step (1) to 6.5-7.5, then placing an inert positive electrode plate and an inert negative electrode plate in the anaerobic reactor, and controlling the current intensity to be 30-80 mA by an external voltage-stabilizing constant-current power supply;
(3) and (3) carrying out anaerobic digestion on the mixture in the anaerobic reactor in the step (2) at 15-35 ℃, continuously introducing nitrogen from the bottom of the anaerobic reactor, releasing phosphine by anaerobic microorganisms under the action of biochar coupling micro-current and escaping with carrier gas, reducing the total phosphorus content in the original wastewater, and realizing the dephosphorization of the wastewater.
Introducing nitrogen into the step (3) at the flow rate of 2 multiplied by 10-3 ~4×10-3 m/s。
2. The method for enhancing the phosphorus removal of the anaerobic organisms in the wastewater by the biochar coupled micro-current as claimed in claim 1, which is characterized in that: in the step (1), the biochar is one or more of coconut shell biochar, corn straw biochar and bamboo scrap biochar; the biochar is prepared by placing a biomass material in a muffle furnace, heating to 500-700 ℃ at a speed of 15-25 ℃/min under the condition of nitrogen, carbonizing for 2-3 h, cooling, soaking for 30min by using 0.1-0.3 mol/L HCl, washing by using deionized water until washing liquor is neutral, and drying at 80 ℃ until constant weight is achieved.
3. The method for enhancing the phosphorus removal of the anaerobic organisms in the wastewater by the biochar coupled micro-current as claimed in claim 1, which is characterized in that: the adding amount of the biochar in the step (1) is 0.5-1.5 kg/m3And treating the phosphorus-containing wastewater.
4. The method for enhancing the phosphorus removal of the anaerobic organisms in the wastewater by the biochar coupled micro-current as claimed in claim 1, which is characterized in that: in the step (3), the anaerobic digestion time is 36-72 h.
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| CN2799543Y (en) * | 2005-01-04 | 2006-07-26 | 华南理工大学 | Electrode biomembrane-SBR denitrification and phosphorus-removing equipment |
| CN101781019A (en) * | 2010-01-08 | 2010-07-21 | 河海大学 | Anaerobic dephosphorizing method based on methanation, anaerobic ammonium oxidation and denitrification coupling process |
| CN103130337A (en) * | 2013-01-29 | 2013-06-05 | 清华大学 | Method utilizing charcoal to achieve rural non-point source pollution denitrogenating |
| CN107364948A (en) * | 2017-07-27 | 2017-11-21 | 沈阳建筑大学建筑设计研究院 | Activated sludge fado cathode chamber denitrification dephosphorization produces electricity device |
| KR101811010B1 (en) * | 2016-06-17 | 2017-12-21 | 주식회사 장호 | Device for Treating Waste Water Using Sequencing Batch Reactor with biofilm and filter film |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2799543Y (en) * | 2005-01-04 | 2006-07-26 | 华南理工大学 | Electrode biomembrane-SBR denitrification and phosphorus-removing equipment |
| CN101781019A (en) * | 2010-01-08 | 2010-07-21 | 河海大学 | Anaerobic dephosphorizing method based on methanation, anaerobic ammonium oxidation and denitrification coupling process |
| CN103130337A (en) * | 2013-01-29 | 2013-06-05 | 清华大学 | Method utilizing charcoal to achieve rural non-point source pollution denitrogenating |
| KR101811010B1 (en) * | 2016-06-17 | 2017-12-21 | 주식회사 장호 | Device for Treating Waste Water Using Sequencing Batch Reactor with biofilm and filter film |
| CN107364948A (en) * | 2017-07-27 | 2017-11-21 | 沈阳建筑大学建筑设计研究院 | Activated sludge fado cathode chamber denitrification dephosphorization produces electricity device |
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