CN110104830B - Combined process for treating heavy metal content of biogas slurry for irrigating tea garden - Google Patents
Combined process for treating heavy metal content of biogas slurry for irrigating tea garden Download PDFInfo
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- CN110104830B CN110104830B CN201910420239.7A CN201910420239A CN110104830B CN 110104830 B CN110104830 B CN 110104830B CN 201910420239 A CN201910420239 A CN 201910420239A CN 110104830 B CN110104830 B CN 110104830B
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/20—Liquid fertilisers
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/529—Processes or devices for preparing lime water
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention discloses a combined process for treating heavy metal content in biogas slurry for irrigating a tea garden, which is implemented step by step to remove the heavy metal content in the biogas slurry step by step, and particularly, lead ions are removed by adding ferrous sulfate; the plant ash is added subsequently, so that the pH value can be adjusted to gradually increase from acidity to a range of 7-9, heavy metal ions such as nickel, chromium and zinc are gradually precipitated, the potassium content in the biogas slurry can be increased, the potassium absorption of tea trees is promoted, the plant ash is flocculent in the biogas slurry and is combined with the precipitate after the precipitate appears, the precipitate is favorably deposited, and the filtration is convenient; and finally, the pH value is adjusted by using quicklime, so that the pH value can be further increased, and conditions are created for removing copper ions. After the pH value is adjusted for many times, the pH value is applied to a tea garden, so that the aim of removing heavy metal ions is fulfilled, the acid soil of the tea garden can be preliminarily improved, and the situation that the tea garden soil is over-acidified to hinder the growth of tea trees is avoided.
Description
Technical Field
The invention belongs to the technical field of resource environment protection, and particularly relates to a combined process for treating heavy metal content in biogas slurry for irrigating a tea garden.
Background
With the development of livestock and poultry breeding industry, the livestock and poultry breeding in China generally has the characteristics of large breeding amount and large excrement amount, and the biogas engineering becomes a mainstream mode for recycling and harmless treatment of the livestock and poultry breeding excrement. The biogas slurry is a high-quality and high-efficiency organic fertilizer, contains rich organic matters, nitrogen, phosphorus, potassium nutrients and other beneficial mineral elements, and is the most economic and effective treatment mode for farmland utilization.
In order to prevent livestock and poultry diseases, improve the utilization rate of feed and promote the growth of animals, a large amount of heavy metal preparations are widely added into animal feed, but the utilization rate of heavy metals of livestock and poultry is extremely low, and most of the heavy metals are discharged out of bodies along with excrement, so that biogas slurry after anaerobic digestion contains a large amount of heavy metals such as copper, zinc, arsenic, barium and the like. After the biogas slurry is applied to farmlands for a long time, heavy metal in soil is accumulated, heavy metal in plants is enriched, and finally human health is harmed through a food chain. Heavy metal pollution exists in a water body-soil-animal and plant ecosystem and is one of the more common pollutions at present. It is easily bioaccumulated, cannot be biodegraded, and has a bioamplification effect, and the toxicity is determined not only by the total amount but also by the occurrence of the form. Therefore, the research on the method for removing the heavy metals in the biogas slurry is an urgent need to solve the problem of guaranteeing the safety of the biogas slurry in agriculture.
At present, the heavy metal removing mode in the biogas slurry is mostly an adsorption mode, for example, the CN201410067758.7 patent is adopted, and the adsorption mode is low in cost and convenient in obtaining mode, so that the effect of removing the heavy metal can be well achieved.
However, although the content of heavy metals can be reduced by adsorbing the heavy metals in the biogas slurry by using cheap and easily available agricultural wastes, the content of organic matters in the biogas slurry is also adsorbed due to multi-stage adsorption while the heavy metals in the biogas slurry are adsorbed, especially the content of organic matters which contain a large amount of nutrients but are insoluble in the biogas slurry is remained in the adsorbate after multiple times of adsorption, so that the heavy metals in the biogas slurry can not be effectively recycled, and huge waste of resources is caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a simple, feasible and low-cost combined process for treating the heavy metal content of biogas slurry in a tea garden.
The purpose of the invention is realized by the following technical scheme:
a combined process for treating heavy metal content in biogas slurry used for irrigating a tea garden comprises the following steps:
s1: separating the anaerobic fermentation biogas slurry by a solid-liquid separation device, then flowing into a reaction tank, stirring the biogas slurry, standing, after the biogas slurry is stably layered, respectively sampling in a clear water layer and an organic matter layer, wherein the clear water layer and the organic matter layer are respectively sampled at not less than three times according to the depth, and determining the heavy metal density at each sampling point;
s2: according to the distribution of the volume of the biogas slurry in the reaction tank and the depth of the sampling point, the density of heavy metals in the biogas slurry is calculated:
wherein, a1、a2、a3The adjustment parameters are adjusted to be between 0.3 and 0.5,
a1”、a2”、a3"is an adjusting parameter with the value of 0.5-0.7,
ρ1、ρ2、ρ3respectively measuring the heavy metal density of each sampling point of the clear water layer;
V1、V2、V3the volumes of the clear water layer corresponding to the sampling points are respectively;
ρ”1ρ”2ρ”3respectively measuring the heavy metal density of each sampling point of the organic matter layer;
V1”、V2”、V3"the volumes corresponding to the sampling points of the organic substance layer respectively;
v is the total volume of the biogas slurry;
s3: according to the mass ratio of ferrous sulfate to lead content of 10-20: 1, adding ferrous sulfate into the reaction tank according to the feed ratio, fully stirring for 2-3 h, and filtering precipitates by using a filter screen;
s4: continuously adding ferrous sulfate into the reaction tank according to the feeding ratio of the ferrous sulfate to chromium being 10-20: 1, the feeding ratio of the ferrous sulfate to nickel being 5-8: 1, the feeding ratio of the ferrous sulfate to zinc being 5-8: 1 and the feeding ratio of the ferrous sulfate to copper being 5-8: 1, gradually adding plant ash, adjusting the pH value to 7-9: 1, fully stirring, and filtering precipitates by using a filter screen for 2-3 hours;
s5: continuously adding quicklime to adjust the pH value to 9-11, fully stirring for 2-3 h, and filtering precipitates by using a filter screen.
Further, step S2 after using the filter screen to filter the precipitate, sample the natural pond liquid, drip BaCl into the natural pond liquid of sample2The step S3 is carried out when the white precipitate is generated, otherwise, ferrous sulfate is continuously added, and the filter screen is used for filtering and precipitating after the full stirringThe mixture was precipitated and sampled again, and the operation was repeated.
Further, the steam is used for heating to 30-50 ℃ in the steps S3 and S4.
Furthermore, the filter mesh diameter in the steps S3, S4 and S5 is less than or equal to 0.425 mm.
Further, the ferrous sulfate in the steps S2 and S3 has a chemical formula of FeSO4·7H2And the solid of O is added for multiple times.
Further, the steps S3 and S4 are performed while stirring sufficiently, by blowing air using an air compressor.
The invention has the beneficial effects that:
1) the heavy metal content in the biogas slurry is removed step by a step implementation mode, and specifically, lead ions are removed by adding ferrous sulfate; the plant ash is added subsequently, so that the pH value can be adjusted to gradually increase from acidity to a range of 7-9, heavy metal ions such as nickel, chromium and zinc are gradually precipitated, the potassium content in the biogas slurry can be increased, the potassium absorption of tea trees is promoted, the plant ash is flocculent in the biogas slurry and is combined with the precipitate after the precipitate appears, the precipitate is favorably deposited, and the filtration is convenient; and finally, the pH value is adjusted by using quicklime, so that the pH value can be further increased, and conditions are created for removing copper ions. After the pH value is adjusted for many times, the pH value is applied to a tea garden, so that the aim of removing heavy metal ions is fulfilled, the acid soil of the tea garden can be preliminarily improved, and the situation that the tea garden soil is over-acidified to hinder the growth of tea trees is avoided.
2) Because heavy metal ion is attached to on the organic matter of big granule mostly in natural pond liquid, consequently not evenly distributed in natural pond liquid, after stewing, heavy metal ion's distribution and degree of depth positive correlation but nonlinear correlation, when measuring heavy metal ion's content, adopt clear water layer and organic matter layer to take a sample respectively, the calculated result and the accommodate coefficient of a plurality of sampling points combine, the accuracy of measuring result has been revised, both reached the effect of practicing thrift and getting rid of heavy metal ion raw materials, add too much other ions when having avoided getting rid of heavy metal ion again.
3) According to the invention, the heavy metal ions are settled, and the sediment is treated in a filtering manner, so that the situation of resource waste caused by absorption of heavy metal ions and adsorption of a large amount of organic matter content in an adsorption manner is avoided, and the process is simple, economic and effective.
4) The added iron ions can be combined with the heavy metal ions to form complex ferrite to be deposited together, so that the heavy metal components brought by the added reaction substances are avoided, and the treatment mode is safe.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1:
a combined process for treating heavy metal content in biogas slurry used for irrigating a tea garden comprises the following steps:
s1: separating the anaerobic fermentation biogas slurry by a solid-liquid separation device, then flowing into a reaction tank, stirring the biogas slurry, standing, after the biogas slurry is stably layered, respectively sampling in a clear water layer and an organic matter layer, sampling three parts of the clear water layer and the organic matter layer according to the depth, and measuring the heavy metal density of each sampling point;
s2: according to the distribution of the volume of the biogas slurry in the reaction tank and the depth of the sampling point, the density of heavy metals in the biogas slurry is calculated:
wherein, a1、a2、a3Respectively taking the values of 0.3, 0.4 and 0.5;
a1”、a2”、a3"takes values of 0.5, 0.6 and 0.7 respectively,
ρ1、ρ2、ρ3respectively taking out of clear water layerMeasuring the heavy metal density of a sampling point;
V1、V2、V3respectively the volume above the first sampling point in the clear water layer, the volume between the second sampling point and the first sampling point and the residual volume of the clear water layer;
ρ”1ρ”2ρ”3respectively measuring the heavy metal density of each sampling point of the organic matter layer;
V1”、V2”、V3"the volume above the first sampling point in the organic substance layer, the volume between the second sampling point and the first sampling point, and the remaining volume of the organic substance layer;
v is the total volume of the biogas slurry;
s3: according to the mass ratio of ferrous sulfate to lead content of 20:1, adding ferrous sulfate into the reaction tank, fully stirring for 2-3 h, filtering precipitates by using a filter screen, sampling biogas slurry, and dripping BaCl into the sample2If the precipitate is generated, the next step is carried out, if the precipitate is not generated, ferrous sulfate is continuously added, the mixture is fully stirred and filtered, and then the sampling operation is carried out;
s4: continuously adding ferrous sulfate into the reaction tank according to the feeding ratio of the ferrous sulfate to chromium being 20:1, the feeding ratio of the ferrous sulfate to nickel being 8:1, the feeding ratio of the ferrous sulfate to zinc being 8:1 and the feeding ratio of the ferrous sulfate to copper being 8:1, gradually adding plant ash, adjusting the pH value to 7-9, fully stirring, and filtering precipitates by using a filter screen for 2-3 hours;
s5: continuously adding quicklime to adjust the pH value to 9-11, fully stirring for 2-3 h, and filtering precipitates by using a filter screen.
FeSO is selected as ferrous sulfate in the process4·7H2When the solid O is added, 2/3 of ferrous sulfate is added firstly, and the rest 1/3 of ferrous sulfate is added after the reaction is fully carried out.
In this example, first, in the case where plant ash is not added, the biogas slurry is in an acidic condition, and Cr is present6+Is firstly made of Fe2+Reduction to Cr3+: with SO4 2-With Pb2+The ions are combined to generate white precipitate, and lead ions are removed.
Then adding plant ash to adjust the pH value to be alkaline so as to lead Cr in the plant ash to be3+、Fe3+And Fe2+Coprecipitation occurs:
Fe2++2OH－——Fe(OH)2
Fe3++3OH－——Fe(OH)3
6Fe(OH)2+O2——2FeO·Fe2O3+6H2O
3FeO·Fe2O3+Cr3+——Fe3+[Fe2+·Fe3+ (1－x)·Cr3+x]O4
Cr6+finally, the ferrite is generated and then is settled.
Adding quicklime to continuously adjust the pH, sequentially generating ferrite by Ni ions, Zn ions and Cu ions in an alkaline environment to be settled, and directly removing the ferrite by filtering.
The change in the content of heavy metals was determined as follows (using ICP-MS):
as can be seen from Table 1, the removal rate of the heavy metal content of the biogas slurry after treatment is over 70%, particularly the removal rate of Pb and Cu is over 80%, and the heavy metal pollution caused by the fertilizing stage of the biogas slurry is effectively avoided.
Example two:
a combined process for treating heavy metal content in biogas slurry used for irrigating a tea garden comprises the following steps:
s1: separating the anaerobic fermentation biogas slurry by a solid-liquid separation device, then flowing into a reaction tank, stirring the biogas slurry, standing, after the biogas slurry is stably layered, respectively sampling four parts of clear water layer and organic matter layer, and measuring the heavy metal density of each sampling point;
s2: according to the distribution of the volume of the biogas slurry in the reaction tank and the depth of the sampling point, the density of heavy metals in the biogas slurry is calculated:
wherein, a1、a2、a3、a3Respectively taking the values of 0.3, 0.35, 0.4 and 0.45;
a1”、a2”、a3”、a4"take the value of 0.5, 0.55, 0.6, 0.65 respectively;
ρ1、ρ2、ρ3、ρ4respectively measuring the heavy metal density of each sampling point of the clear water layer;
V1、V2、V3、V4respectively the volume above the first sampling point in the clear water layer, the volume between the second sampling point and the first sampling point, the volume between the third sampling point and the second sampling point, and the residual volume of the clear water layer
ρ”1ρ”2ρ”3ρ”4Respectively measuring the heavy metal density of each sampling point of the organic matter layer;
V1”、V2”、V3”、V4"the volume above the first sampling point in the organic matter layer, the volume between the second sampling point and the first sampling point, the volume between the third sampling point and the second sampling point, and the residual volume of the organic matter layer;
v is the total volume of the biogas slurry;
s3: according to the mass ratio of ferrous sulfate to lead content of 15:1, adding ferrous sulfate into the reaction tank, heating the mixture to 40 ℃ by using steam, blowing air into the reaction tank, fully stirring the mixture for 2 to 3 hours, filtering precipitates by using a filter screen, sampling biogas slurry, and dripping BaCl into the sample2If the precipitate is generated, the next step is carried out, if the precipitate is not generated, ferrous sulfate is continuously added, the mixture is fully stirred and filtered, and then the sampling operation is carried out;
s4: continuously adding ferrous sulfate into the reaction tank according to the feeding ratio of the ferrous sulfate to chromium being 15:1, the feeding ratio of the ferrous sulfate to nickel being 6:1, the feeding ratio of the ferrous sulfate to zinc being 6:1 and the feeding ratio of the ferrous sulfate to copper being 8:1, gradually adding plant ash, adjusting the pH value to 9, heating the mixture to 40 ℃ by using steam, blowing air, and filtering precipitates by using a filter screen after fully stirring for 2-3 hours;
s5: continuously adding quicklime to adjust the pH value to 11, heating to 40 ℃ by using steam, blowing air, fully stirring for 2-3 h, and filtering precipitates by using a filter screen.
The content change of the heavy metal is determined as follows:
the foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A combined process for treating heavy metal content in biogas slurry used for irrigating a tea garden is characterized in that: comprises the following steps:
s1: separating the anaerobic fermentation biogas slurry by a solid-liquid separation device, then flowing into a reaction tank, stirring the biogas slurry, standing, after the biogas slurry is stably layered, respectively sampling in a clear water layer and an organic matter layer, wherein the clear water layer and the organic matter layer are respectively sampled at not less than three times according to the depth, and determining the heavy metal density at each sampling point;
s2: according to the distribution of the volume of the biogas slurry in the reaction tank and the depth of the sampling point, the density of heavy metals in the biogas slurry is calculated:
wherein, a1、a2、a3The adjustment parameters are adjusted to be between 0.3 and 0.5,
a1″、a2″、a3"is an adjusting parameter with a value between 0.5 and 0.7,
ρ1、ρ2、ρ3respectively measuring the heavy metal density of each sampling point of the clear water layer;
V1、V2、V3the volumes of the clear water layer corresponding to the sampling points are respectively;
ρ1″ρ2″ρ3"the heavy metal density measurements at each sampling point of the organic layer;
V1″、V2″、V3"volume corresponding to each sampling point of the organic layer;
v is the total volume of the biogas slurry;
s3: according to the mass ratio of ferrous sulfate to lead content of 10-20: 1, adding ferrous sulfate into the reaction tank according to the feed ratio, fully stirring for 2-3 h, and filtering precipitates by using a filter screen;
s4: continuously adding ferrous sulfate into the reaction tank according to the feeding ratio of the ferrous sulfate to chromium being 10-20: 1, the feeding ratio of the ferrous sulfate to nickel being 5-8: 1, the feeding ratio of the ferrous sulfate to zinc being 5-8: 1 and the feeding ratio of the ferrous sulfate to copper being 5-8: 1, gradually adding plant ash, adjusting the pH value to 7-9, fully stirring, and filtering precipitates by using a filter screen for 2-3 hours;
s5: continuously adding quicklime to adjust the pH value to 9-11, fully stirring for 2-3 h, and filtering precipitates by using a filter screen.
2. The combined process for treating biogas slurry heavy metal content in an irrigated tea garden of claim 1, wherein: step S2 is that after filtering the precipitate by using a filter screen, sampling the biogas slurry, and dripping BaCl into the sampled biogas slurry2And (5) entering step S3 if the white precipitate is generated, otherwise, continuously adding ferrous sulfate, fully stirring, filtering the precipitate by using a filter screen, sampling again, and repeating the operation.
3. The combined process for treating biogas slurry heavy metal content in an irrigated tea garden of claim 1, wherein: in the steps S3 and S4, steam is used for heating to 30-50 ℃.
4. The combined process for treating biogas slurry heavy metal content in an irrigated tea garden of claim 1, wherein: the filter mesh diameter in the steps S3, S4 and S5 is less than or equal to 0.425 mm.
5. The combined process for treating biogas slurry heavy metal content in an irrigated tea garden of claim 1, wherein: the ferrous sulfate in the steps S2 and S3 has a chemical formula of FeSO4·7H2And the solid of O is added for multiple times.
6. The combined process for treating biogas slurry heavy metal content in an irrigated tea garden of claim 1, wherein: air is blown in using an air compressor while sufficiently stirring in the steps S3 and S4.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010112A (en) * | 2010-09-27 | 2011-04-13 | 南京宏博环保实业有限公司 | Method for treating livestock wastes |
| CN106315800A (en) * | 2016-08-25 | 2017-01-11 | 周荣 | Method for treating high-concentration chromium-containing wastewater through precipitation assisted with plants |
| CN107522321A (en) * | 2017-09-26 | 2017-12-29 | 湖北大学 | The application of the method and recovered liquid of suspension and toxic heavy metal and recovered liquid in a kind of removal biogas slurry |
| CN107601705A (en) * | 2017-09-26 | 2018-01-19 | 湖北大学 | A kind of combination stalk method removes the method and recovered liquid of suspension and toxic heavy metal and the application of recovered liquid in biogas slurry |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010112A (en) * | 2010-09-27 | 2011-04-13 | 南京宏博环保实业有限公司 | Method for treating livestock wastes |
| CN106315800A (en) * | 2016-08-25 | 2017-01-11 | 周荣 | Method for treating high-concentration chromium-containing wastewater through precipitation assisted with plants |
| CN107522321A (en) * | 2017-09-26 | 2017-12-29 | 湖北大学 | The application of the method and recovered liquid of suspension and toxic heavy metal and recovered liquid in a kind of removal biogas slurry |
| CN107601705A (en) * | 2017-09-26 | 2018-01-19 | 湖北大学 | A kind of combination stalk method removes the method and recovered liquid of suspension and toxic heavy metal and the application of recovered liquid in biogas slurry |
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