CN104909424A - Method for treatment of high concentration ammonia nitrogen in monosodium glutamate wastewater - Google Patents
Method for treatment of high concentration ammonia nitrogen in monosodium glutamate wastewater Download PDFInfo
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Abstract
Belonging to the field of sewage treatment, the invention discloses a method for treatment of ammonia nitrogen in monosodium glutamate wastewater, and relates to a method for treatment of high concentration ammonia nitrogen in pesticide wastewater. According to the method, a prepared organic composite denitrification agent modified magnesium aluminum iron hydrotalcite magnetic nano-adsorption material and an adhesive are prepared into a thick liquid according to a mass ratio of 1:5, the thick liquid is applied to an adsorption rod surface layer, after drying under a ventilation state, the adsorption rod is placed in an adsorption tower, pesticide wastewater penetrating fluid flows through, the high concentration ammonia nitrogen in the wastewater is adsorbed, and after saturation, the adsorption material surface layer ages, under the action of an external magnetic field and water flow scouring, the adsorption material surface layer sheds layer upon layer, and finally the content of ammonia nitrogen in the wastewater is determined. The method provided by the invention realizes modification of the adsorption material, needs no regeneration, and finally the ammonia nitrogen concentration in the discharged wastewater is below 0.8mg/L, the removal rate reaches over 99.99%, and secondary pollution to the environment is not caused.
Description
Technical field
The present invention discloses a kind of process gourmet powder waste water middle and high concentration ammonia nitrogen method, belongs to sewage treatment area.
Background technology
Gourmet powder waste water mainly comes from the washes that extracts various equipment in the fermented waste fluid after monosodium glutamate or ion-exchange tail washings, production process and various disinfected wastewaters etc., outward appearance is brown, ammonia nitrogen concentration in waste water reaches about 10000mg/L, wherein the COD of fermented waste fluid is especially up to 60-80g/L, huge threat is existed to environment, wherein nitrosamine is a kind of strong carcinogen, totally unfavorable to HUMAN HEALTH.
Because gourmet powder waste water ammonia and nitrogen components is complicated, cause traditional denitrification effect not good, method practical at present has break point chlorination, selective ion exchange method, air stripping method and vaporizing extract process etc., as traditional steaming nitrogen method adopts water vapor as termite, make the equilibrium vapor pressure of ammonia on Cyclic Rings water liquid level be greater than the dividing potential drop of ammonia nitrogen in thermal barrier, thus reach the object of denitrogenation, the method is simple, denitrification process is stable, but cost is high, especially secondary pollution is caused to air.
Summary of the invention
The technical problem that the present invention mainly solves: there is ammonia emission in conjunction with blow-off method in high-concentration ammonia nitrogenous wastewater treating processes for current organic composite denitrfying agent, cause secondary environmental pollution problem, provide a kind of organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite nano magnetic adsorptive material, absorption high-concentration ammonia nitrogen in waste water, and saturated after can aging sorbing material top layer, under externally-applied magnetic field and current scour effect, realize the renewal of sorbing material, without the need to regeneration.
In order to solve the above problems, the technical solution adopted in the present invention is: a kind of process gourmet powder waste water middle and high concentration ammonia nitrogen method, is characterized in that organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material preparation process is:
(1) magnesium-aluminum-iron hydrotalcite preparation: take 4.7 ~ 11.6g magnesium nitrate, 3.2 ~ 7.8g aluminum nitrate respectively, 4.8 ~ 15.6g iron nitrate is dissolved in 350 ~ 500ml and contains in the ethanol solution of 4.0 ~ 8.4g urea; Stirred at ambient temperature 1h; Pour in hydrothermal reaction kettle and be heated to 140 DEG C, reaction 12 ~ 16h; The room temperature of cooling; With after ethanol and washed with de-ionized water three times at 60 DEG C dry 8h, obtain nano magnalium molten iron talcum;
(2) magnetize: be concentrated hydrochloric acid and the saturated potassium hydroxide solution immersion 6h of 36.5% successively by mass concentration by the nano magnalium molten iron talcum of above-mentioned preparation, be placed in retort furnace, dry at temperature is 105 DEG C, near magnetic field magnetisation;
(3) modification:; Nano magnalium molten iron talc materials after pickling, alkali leaching and magnetization is immersed in 15 ~ 40g organic composite denitrfying agent, stirs 15 ~ 45min;
(4) dry: by modified nano magnalium molten iron talc materials washed with de-ionized water 3 sections, dry under nitrogen protection condition;
(5) activate: at temperature is 800 DEG C ~ 900 DEG C, calcine 4 ~ 6h.
Described organic composite denitrfying agent is two carbaryls, oxysuccinic acid, ethylene-acetic acid ethyl ester three kinds of materials, counts in mass ratio, 15% ~ 20% 2 carbaryl, 20% ~ 70% oxysuccinic acid, 10% ~ 65% ethylene-acetic acid ethyl ester.
A kind of process gourmet powder waste water middle and high concentration ammonia nitrogen method, is characterized in that embody rule method is:
(1) by the organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material prepared and tackiness agent in mass ratio 4:1 be made into viscous fluid, viscous fluid spray gun is evenly sprayed on polytetrafluoroethylplastic plastic sheet top layer, every layer of plastic sheet thickness is 7 ~ 15cm;
(2) by sprayed viscous fluid plastic sheet under ventilation state after dry 5 ~ 20min, vertical superposition is placed in adsorption tower, superimposed layer height is 18 ~ 45cm, the alternate space height of interlayer is 24 ~ 70cm, ammonia nitrogen concentration is allowed to be that the gourmet powder waste water of 3000 ~ 10000mg/L flows through in adsorption tower, flow rate control 12 ~ 25m
3/ h, the residence time is 35 ~ 48min;
(3) organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material absorption ammonia nitrogen, along with absorption is constantly tending towards saturated, viscous fluid starts aging, occurs coming off layer by layer;
(4) under the souring of gourmet powder waste water current, aging nano adsorption material top layer is fallen at the bottom of tower, and is separated under additional the action of a magnetic field.
Described tackiness agent is by weight ratio: 42 parts of polyvinyl alcohol, 18 parts of carboxymethyl starch, 20 parts of Graphenes and 20 parts of water glass.
Principle of the present invention is: it is large that magnesium-aluminum-iron hydrotalcite material has specific surface area, belong to mesoporous material material, to ammonia nitrogen in waste water, there is absorption property through organic composite denitrfying agent is modified, the more important thing is, adding of organic composite denitrfying agent, can come off layer by layer voluntarily after sorbing material absorption ammonia nitrogen can be made to reach capacity, realize the renewal on sorbing material surface, again adsorb the ammonia nitrogen in high density in waste water, and the residue after coming off is separated with externally-applied magnetic field effect in current scour.
The invention has the beneficial effects as follows:
(1) ammonia can not be produced and enter air also without precipitating generation, can not secondary environmental pollution being caused;
(2) can come off layer by layer voluntarily after the hydrotalcite of modification adsorbs ammonia nitrogen, without the need to regeneration;
(3) ammonia nitrogen removal frank is high, and in final last wastewater measurement water outlet, ammonia-nitrogen content is below 0.02mgL, and clearance reaches more than 99.99%.
Embodiment
Preparation method
First take respectively 4.7 ~ 11.6g magnesium nitrate, 3.2 ~ 7.8g aluminum nitrate, 4.8 ~ 15.6g iron nitrate is dissolved in 350 ~ 500ml and contains in the ethanol solution of 4.0 ~ 8.4g urea, stirred at ambient temperature 1h, pour in hydrothermal reaction kettle and be heated to 140 DEG C, reaction 12 ~ 16h, the room temperature of cooling, with after ethanol and washed with de-ionized water three times at 60 DEG C dry 8h, obtain nano magnalium molten iron talcum, be concentrated hydrochloric acid and the saturated potassium hydroxide solution immersion 6h of 36.5% successively by mass concentration by the nano magnalium molten iron talcum of above-mentioned preparation, be placed in retort furnace, dry at temperature is 105 DEG C, near magnetic field magnetisation, will through pickling, alkali leaching and the nano magnalium molten iron talc materials after magnetizing immerse in 15 ~ 40g organic composite denitrfying agent, stir 15 ~ 45min, by modified nano magnalium molten iron talc materials washed with de-ionized water 3 sections, dry under nitrogen protection condition, 4 ~ 6h is calcined at temperature is 800 DEG C ~ 900 DEG C, described organic composite denitrfying agent is two carbaryls, oxysuccinic acid, ethylene-acetic acid ethyl ester three kinds of materials, count in mass ratio, 15% ~ 20% 2 carbaryl, 20% ~ 70% oxysuccinic acid, 10% ~ 65% ethylene-acetic acid ethyl ester, by the organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material prepared and tackiness agent in mass ratio 4:1 be made into viscous fluid, viscous fluid spray gun is evenly sprayed on polytetrafluoroethylplastic plastic sheet top layer, every layer of plastic sheet thickness is 7 ~ 15cm, by sprayed viscous fluid plastic sheet under ventilation state after dry 5 ~ 20min, vertical superposition is placed in adsorption tower, superimposed layer height is 18 ~ 45cm, the alternate space height of interlayer is 24 ~ 70cm, ammonia nitrogen concentration is allowed to be that the gourmet powder waste water of 3000 ~ 10000mg/L flows through in adsorption tower, flow rate control 12 ~ 25m
3/ h, the residence time is 35 ~ 48min, organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material absorption ammonia nitrogen, along with absorption is constantly tending towards saturated, viscous fluid starts aging, occurs coming off layer by layer, under the souring of gourmet powder waste water current, aging nano adsorption material top layer is fallen at the bottom of tower, and is separated under additional the action of a magnetic field, and described tackiness agent is by weight ratio: 42 parts of polyvinyl alcohol, 18 parts of carboxymethyl starch, 20 parts of Graphenes and 20 parts of water glass.
Application method
First by the organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material prepared and tackiness agent in mass ratio 4:1 be made into viscous fluid, viscous fluid spray gun is evenly sprayed on polytetrafluoroethylplastic plastic sheet top layer, every layer of plastic sheet thickness is 7 ~ 15cm, by sprayed viscous fluid plastic sheet under ventilation state after dry 5 ~ 20min, vertical superposition is placed in adsorption tower, superimposed layer height is 18 ~ 45cm, the alternate space height of interlayer is 24 ~ 70cm, ammonia nitrogen concentration is allowed to be that the gourmet powder waste water of 3000 ~ 10000mg/L flows through in adsorption tower, flow rate control 12 ~ 25m
3/ h, the residence time is 35 ~ 48min, organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material absorption ammonia nitrogen, along with absorption is constantly tending towards saturated, viscous fluid starts aging, occurs coming off layer by layer, under the souring of gourmet powder waste water current, aging nano adsorption material top layer is fallen at the bottom of tower, and is separated under additional the action of a magnetic field, and described tackiness agent is by weight ratio: 42 parts of polyvinyl alcohol, 18 parts of carboxymethyl starch, 20 parts of Graphenes and 20 parts of water glass.
Example 1
First 4.7g magnesium nitrate is taken respectively, 3.2g aluminum nitrate, 4.8g iron nitrate is dissolved in 350ml and contains in the ethanol solution of 4.0g urea, stirred at ambient temperature 1h, pour in hydrothermal reaction kettle and be heated to 140 DEG C, reaction 12h, the room temperature of cooling, to use after ethanol and washed with de-ionized water three times dry 8h at 60 DEG C again, obtain nano magnalium molten iron talcum, by the nano magnalium molten iron talcum of above-mentioned preparation successively with mass concentration be 36.5% concentrated hydrochloric acid and saturated potassium hydroxide solution soak 6h be placed in retort furnace, dry at temperature is 105 DEG C, then near magnetic field magnetisation, again will through pickling, alkali leaching and the nano magnalium molten iron talc materials after magnetizing immerse in 15g organic composite denitrfying agent, wherein wrap 2.25g containing two carbaryls, 3g oxysuccinic acid, 9.75g ethylene-acetic acid ethyl ester, stir 15min, again by modified nano magnalium molten iron talc materials washed with de-ionized water 3 sections, at temperature is 800 DEG C, 4h is calcined after drying under nitrogen protection condition, by the organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material prepared and tackiness agent in mass ratio 4:1 be made into viscous fluid, viscous fluid spray gun is evenly sprayed on polytetrafluoroethylplastic plastic sheet top layer, every layer of plastic sheet thickness is 7cm, by sprayed viscous fluid plastic sheet under ventilation state after dry 5min, vertical superposition is placed in adsorption tower, superimposed layer height is 18cm, the alternate space height of interlayer is 24cm, ammonia nitrogen concentration is allowed to be that the gourmet powder waste water of 3000mg/L flows through in adsorption tower, flow rate control 12m
3/ h, the residence time is 35min, organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material absorption ammonia nitrogen, along with absorption is constantly tending towards saturated, viscous fluid starts aging, occur coming off layer by layer, under the souring of gourmet powder waste water current, aging nano adsorption material top layer is fallen at the bottom of tower, and is separated under additional the action of a magnetic field, in last wastewater measurement water outlet, ammonia-nitrogen content is below 0.02mg/l, and clearance reaches more than 99.99%.
Example 2
First 11.6g magnesium nitrate is taken respectively, 7.8g aluminum nitrate, 15.6g iron nitrate is dissolved in 500ml and contains in the ethanol solution of 8.4g urea, stirred at ambient temperature 1h, pour in hydrothermal reaction kettle and be heated to 140 DEG C, reaction 16h, the room temperature of cooling, to use after ethanol and washed with de-ionized water three times dry 8h at 60 DEG C again, obtain nano magnalium molten iron talcum, by the nano magnalium molten iron talcum of above-mentioned preparation successively with mass concentration be 36.5% concentrated hydrochloric acid and saturated potassium hydroxide solution soak 6h be placed in retort furnace, dry at temperature is 105 DEG C, then near magnetic field magnetisation, again will through pickling, alkali leaching and the nano magnalium molten iron talc materials after magnetizing immerse in 20g organic composite denitrfying agent, wherein comprise 4g bis-carbaryl, 4g oxysuccinic acid, 12g ethylene-acetic acid ethyl ester, stir 45min, again by modified nano magnalium molten iron talc materials washed with de-ionized water 3 sections, at temperature is 900 DEG C, 6h is calcined after drying under nitrogen protection condition, by the organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material prepared and tackiness agent in mass ratio 4:1 be made into viscous fluid, viscous fluid spray gun is evenly sprayed on polytetrafluoroethylplastic plastic sheet top layer, every layer of plastic sheet thickness is 8cm, by sprayed viscous fluid plastic sheet under ventilation state after dry 20min, vertical superposition is placed in adsorption tower, superimposed layer height is 45cm, the alternate space height of interlayer is 70cm, ammonia nitrogen concentration is allowed to be that the gourmet powder waste water of 10000mg/L flows through in adsorption tower, flow rate control 25m
3/ h, the residence time is 48min, organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material absorption ammonia nitrogen, along with absorption is constantly tending towards saturated, viscous fluid starts aging, occur coming off layer by layer, under the souring of gourmet powder waste water current, aging nano adsorption material top layer is fallen at the bottom of tower, and is separated under additional the action of a magnetic field, in last wastewater measurement water outlet, ammonia-nitrogen content is below 0.02mg/L, and clearance reaches more than 99.99%.
Example 3
First 10.5g magnesium nitrate is taken respectively, 6.7g aluminum nitrate, 15.4g iron nitrate is dissolved in 450ml and contains in the ethanol solution of 7.5g urea, stirred at ambient temperature 1h, pour in hydrothermal reaction kettle and be heated to 140 DEG C, reaction 13.5h, the room temperature of cooling, to use after ethanol and washed with de-ionized water three times dry 8h at 60 DEG C again, obtain nano magnalium molten iron talcum, by the nano magnalium molten iron talcum of above-mentioned preparation successively with mass concentration be 36.5% concentrated hydrochloric acid and saturated potassium hydroxide solution soak 6h be placed in retort furnace, dry at temperature is 105 DEG C, then near magnetic field magnetisation, again will through pickling, alkali leaching and the nano magnalium molten iron talc materials after magnetizing immerse in 40g organic composite denitrfying agent, wherein comprise 6.8g bis-carbaryl, 16.8g oxysuccinic acid, 16.4g ethylene-acetic acid ethyl ester, stir 27min, again by modified nano magnalium molten iron talc materials washed with de-ionized water 3 sections, at temperature is 860 DEG C, 4.3.h is calcined after drying under nitrogen protection condition, by the organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material prepared and tackiness agent in mass ratio 4:1 be made into viscous fluid, viscous fluid spray gun is evenly sprayed on polytetrafluoroethylplastic plastic sheet top layer, every layer of plastic sheet thickness is 7 ~ 15cm, by sprayed viscous fluid plastic sheet under ventilation state after dry 5 ~ 20min, vertical superposition is placed in adsorption tower, superimposed layer height is 18 ~ 45cm, the alternate space height of interlayer is 24 ~ 70cm, ammonia nitrogen concentration is allowed to be that the gourmet powder waste water of 3000 ~ 10000mg/L flows through in adsorption tower, flow rate control 12 ~ 25m
3/ h, the residence time is 35 ~ 48min, organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material absorption ammonia nitrogen, along with absorption is constantly tending towards saturated, viscous fluid starts aging, occur coming off layer by layer, under the souring of gourmet powder waste water current, aging nano adsorption material top layer is fallen at the bottom of tower, and is separated under additional the action of a magnetic field, in last wastewater measurement water outlet, ammonia-nitrogen content is below 0.02mg/l, and clearance reaches more than 99.99%.
Claims (4)
1. process a gourmet powder waste water middle and high concentration ammonia nitrogen method, it is characterized in that organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material preparation process is:
(1) magnesium-aluminum-iron hydrotalcite preparation: take 4.7 ~ 11.6g magnesium nitrate, 3.2 ~ 7.8g aluminum nitrate respectively, 4.8 ~ 15.6g iron nitrate is dissolved in 3505 ~ 00ml and contains in the ethanol solution of 4.0 ~ 8.4g urea; Stirred at ambient temperature 1h; Pour in hydrothermal reaction kettle and be heated to 140 DEG C, reaction 12 ~ 16h; The room temperature of cooling; With after ethanol and washed with de-ionized water three times at 60 DEG C dry 8h, obtain nano magnalium molten iron talcum;
(2) magnetize: be concentrated hydrochloric acid and the saturated potassium hydroxide solution immersion 6h of 36.5% successively by mass concentration by the nano magnalium molten iron talcum of above-mentioned preparation, be placed in retort furnace, dry at temperature is 105 DEG C, near magnetic field magnetisation;
(3) modification:; Nano magnalium molten iron talc materials after pickling, alkali leaching and magnetization is immersed in 15 ~ 40g organic composite denitrfying agent, stirs 15 ~ 45min;
(4) dry: by modified nano magnalium molten iron talc materials washed with de-ionized water 3 sections, dry under nitrogen protection condition;
(5) activate: at temperature is 800 DEG C ~ 900 DEG C, calcine 4 ~ 6h.
2. one processes gourmet powder waste water middle and high concentration ammonia nitrogen method according to claim 1, it is characterized in that: described organic composite denitrfying agent is two carbaryls, oxysuccinic acid, ethylene-acetic acid ethyl ester three kinds of materials, count in mass ratio, 15% ~ 20% 2 carbaryl, 20% ~ 70% oxysuccinic acid, 10% ~ 65% ethylene-acetic acid ethyl ester.
3. process a gourmet powder waste water middle and high concentration ammonia nitrogen method, it is characterized in that embody rule method is:
(1) by the organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material prepared and tackiness agent in mass ratio 4:1 be made into viscous fluid, viscous fluid spray gun is evenly sprayed on polytetrafluoroethylplastic plastic sheet top layer, every layer of plastic sheet thickness is 7 ~ 15cm;
(2) by sprayed viscous fluid plastic sheet under ventilation state after dry 5 ~ 20min, vertical superposition is placed in adsorption tower, superimposed layer height is 18 ~ 45cm, the alternate space height of interlayer is 24 ~ 70cm, ammonia nitrogen concentration is allowed to be that the wastewater from chemical industry of 3000 ~ 10000mg/L flows through in adsorption tower, flow rate control 12 ~ 25m
3/ h, the residence time is 35 ~ 48min;
(3) organic composite denitrfying agent modification magnesium-aluminum-iron hydrotalcite magnetic nano adsorption material absorption ammonia nitrogen, along with absorption is constantly tending towards saturated, viscous fluid starts aging, occurs coming off layer by layer;
(4) under the souring of chemical industry monosodium glutamate current, aging nano adsorption material top layer is fallen at the bottom of tower, and is separated under additional the action of a magnetic field.
4. a kind of method processing wastewater from chemical industry middle and high concentration ammonia nitrogen according to claim 3, is characterized in that: described tackiness agent is by weight ratio: 42 parts of polyvinyl alcohol, 18 parts of carboxymethyl starch, 20 parts of Graphenes and 20 parts of water glass.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107628680A (en) * | 2017-11-09 | 2018-01-26 | 浙江亲水园生物科技有限公司 | A kind of use in waste water treatment water purification agent and its production method and its application method |
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| CN101962208A (en) * | 2010-10-28 | 2011-02-02 | 上海工程技术大学 | Magnesium-aluminum-iron hydrotalcite, preparation method and application thereof as coadsorbent |
| CN102107930A (en) * | 2011-01-06 | 2011-06-29 | 南京大学 | Underground water nitrogen-fixation remediation filtering material and preparation method thereof |
| CN102502909A (en) * | 2011-11-01 | 2012-06-20 | 同济大学 | Method of using magnesium-aluminum-iron ternary hydrotalcite-like to remove perchlorate in water |
| CN102674515A (en) * | 2012-05-18 | 2012-09-19 | 上海大学 | Method for regulating, controlling and forming hydrotalcite-like compound deep treatment leachate tail water |
| JP2013017928A (en) * | 2011-07-08 | 2013-01-31 | Ihi Corp | Wastewater treatment method, and wastewater treatment apparatus |
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2015
- 2015-05-25 CN CN201510270521.3A patent/CN104909424A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101962208A (en) * | 2010-10-28 | 2011-02-02 | 上海工程技术大学 | Magnesium-aluminum-iron hydrotalcite, preparation method and application thereof as coadsorbent |
| CN102107930A (en) * | 2011-01-06 | 2011-06-29 | 南京大学 | Underground water nitrogen-fixation remediation filtering material and preparation method thereof |
| JP2013017928A (en) * | 2011-07-08 | 2013-01-31 | Ihi Corp | Wastewater treatment method, and wastewater treatment apparatus |
| CN102502909A (en) * | 2011-11-01 | 2012-06-20 | 同济大学 | Method of using magnesium-aluminum-iron ternary hydrotalcite-like to remove perchlorate in water |
| CN102674515A (en) * | 2012-05-18 | 2012-09-19 | 上海大学 | Method for regulating, controlling and forming hydrotalcite-like compound deep treatment leachate tail water |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107628680A (en) * | 2017-11-09 | 2018-01-26 | 浙江亲水园生物科技有限公司 | A kind of use in waste water treatment water purification agent and its production method and its application method |
| CN107628680B (en) * | 2017-11-09 | 2020-01-10 | 浙江亲水园生物科技有限公司 | Water purifying agent for wastewater treatment and production method and use method thereof |
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Application publication date: 20150916 |