CN103435986A - Method for preparing degradable mulching film from excess activated sludge and mulching film - Google Patents
Method for preparing degradable mulching film from excess activated sludge and mulching film Download PDFInfo
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- CN103435986A CN103435986A CN2013103870859A CN201310387085A CN103435986A CN 103435986 A CN103435986 A CN 103435986A CN 2013103870859 A CN2013103870859 A CN 2013103870859A CN 201310387085 A CN201310387085 A CN 201310387085A CN 103435986 A CN103435986 A CN 103435986A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
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Abstract
The invention relates to the technical fields of waste recycling and environmental protection, and discloses a method for preparing a degradable mulching film from excess activated sludge and a mulching film product prepared through the method. According to the invention, a large proportion of sludge and a proper proportion of fibers, adhesive, lubricant and desulfurizer are used as raw materials, the preparation process is improved, no formaldehyde is used, and the disposable degradable mulching film material is prepared through high-temperature pressure forming; and the mulching film material has favorable biodegradability and excellent mechanical property, and conforms to related sanitary standards. According to the invention, the raw materials are simple and accessible; and the process is simple, easy to control and easy to realize industrial production, solves the sludge disposal problem, reduces environmental pollution caused by waste plastic products and has wide application prospects.
Description
Technical field
The present invention relates to changing waste into resources and utilize environmental technology field, more specifically, relate to a kind of method of the standby degradable mulch of residual actived sludge and mulch film product prepared of utilizing.
Background technology
At present, China adopts biological process as the Wastewater Treated by Activated Sludge Process sanitary sewage more.Microbial Communities in Activated Sludge self also increases in breeding when purifying waste water, and must regularly discharge, with the supply that maintains oxygen in Sewage treatment systems and the balance of processing power.These residual active sludges of discharging must be administered.Current treatment process can't meet environmental protection and processed continuously needs, and the recycling of residual active sludge is imperative.
The essential property of residual active sludge: containing organism many, character is unstable, it is smelly easily to degenerate; In mud, the content of hazardous contaminant is high, and in wastewater treatment process, many objectionable impuritiess are enriched in mud; Moisture percentage in sewage sludge is high, is gel-like texture, is difficult for dehydration; Containing more nutrient for plants, fertilizer efficiency is arranged; The objectionable constituent such as organic pollutant that simultaneously also contain the heavy metals such as a large amount of pathogenic agent, parasitic ovum and copper, arsenic, lead, zinc, aluminium, mercury and difficult degradation.
By the compost of mud, landfill, mummification and heat treated and final the utilization, be called the disposal of mud.Conventional disposal options comprises landfill, the row sea, agricultural and burn, very unfortunate, cause again for the second time and pollute when processing excess sludge: (1) sanitary landfill, after mummification, mud and domestic garbage mixing transport the landfill yard processing to, simple to operate, investment cost is less, processing costs is lower, do not need to add separately equipment, strong adaptability, but it has taken a large amount of land resources, the mud poor stability, the generation odour can rot, the easy polluted underground water of moisture seepage and Sludge landfill cost of disposal in mud improve year by year, the treatment technology standard-required of sanitary landfill is more and more higher, it is more and more less that Sludge landfill is disposed proportion.In Europe, excess sludge is many with municipal wastes mixing landfill, but is downtrending year by year, and the ratio of U.S.'s Sludge landfill also just progressively descends, and Sludge landfill has been forbidden in many areas even.In China, landfill remains topmost sludge treating method, and most the employing mixed landfill.(2) Ocean dumping have advantages of simple to operate, do not need special treatment device, can have a strong impact on the marine eco-environment but mud enters ocean, European Union determines after 31 days December in 1998 to forbid mud row sea; Various countries also start to forbid to Ocean dumping mud successively.(3) need mud is carried out to the During High-Temperature Composting processing before making fertilizer, therefore, except needing to add subsequent processing device as stack turner etc., also need the place that provides larger.Sludge manure must meet " pollutent control criterion in agricultural mud " in addition, and the factor that affects its popularization is possible cause pathogenic agent diffusion and heavy metal contamination.Therefore various countries have successively put into effect agricultural sludge heavy-metal permissible concentration standard and the strict innoxious requirement of health, and unit surface mud usage quantity is limited.Directly impose on the issuable detrimentally affect in farmland for reducing or eliminating mud, need be controlled and mud is carried out to pre-treatment the influent quality of Sewage Plant.(4) utilize the high temperature oxidation combustion reactions, under the condition of excess air, the material such as whole organic matters, pathogenic agent that makes mud is in 850～1100 ℃ of lower oxidations, pyrolysis and thoroughly destroyed.This method occupation of land is little, processing is quick, treatment capacity is large, lime-ash after burning directly enters landfill yard after according to heavy metal content, it being processed, also can be used as material of construction or pave the way etc., but this method investment is large, need purchase the sludge incineration specific equipment, operation and maintenance cost is high, can produce the highly toxic substances such as dioxin during burning, contaminate environment.
Research shows, contain abundant available stock in mud, PHA (polyhydroxyalkanoates as the bio-degradable plastics raw material, PHA), PHA is nearly more than the 20 years bioabsorbable polymer materials that develop rapidly, polyester in a kind of cell synthesized by microorganism, it is generally acknowledged fully biodegradable plastic raw materials, its physicochemical property is very close with now widely used common plastics, be the ideal substitute of petrochemical complex synthetic plastics, thereby become the focus of studying in recent years both at home and abroad.
The method that PHA is produced in research and development at present mainly contains bacterium pure culture and residual active sludge fermented by mixed bacterium, and the former has realized industrialized production.The bacterium pure culture is by the screening high-yield strains or builds genetic engineering bacterium, through the industrial fermentation tank, produce, but its complex process, cost is high, the residual active sludge fermented by mixed bacterium is compared techniques such as having lacked sterilizing with pure culture, reduced investment, and the cost of production function and management aspect, organic solvent extraction and purifying cost are higher but process remains indispensable.
For above problem, the PHA in how on the basis reduced production costs, utilizing residual active sludge, the new way of opening up a sewage sludge harmlessness tallied with the national condition, minimizing, stabilization, recycling treatment is the problem of our institute's facing.
Summary of the invention
The technical problem to be solved in the present invention is a kind of brand-new residual active sludge resource utilization scheme of inventing for the deficiency of existing residual active sludge processing and utilizing technology, the invention provides a kind of method of utilizing the standby degradable mulch of residual actived sludge, simple possible, be easy to promote.
Another technical problem that the present invention will solve is to provide the mulch film product that described preparation method prepares, and is the degradable mulch film of disposable use.
Purpose of the present invention is achieved through the following technical solutions:
A kind of method of utilizing the standby degradable mulch of residual actived sludge is provided, comprises the following steps: the pH value of S1. conditioning of mud raw material is neutral, oven dry sludge dewatering to water content in 40 ~ 70%(weight percentage) scope obtain the mud powder;
S2. filamentary material is pulverized, sieved, the boiling post-drying of coming unstuck is collected; S3. filamentary material and sizing agent, lubricant and desulfurization that mud powder S1 prepared, S2 collect
Agent mixes and obtains mixture, adjusts the mixture moisture content in 50% ~ 60% scope;
S4. mixture high-temperature pressurizing moulding S3 prepared, obtain degradable mulch;
Wherein, the weight percent of the shared all raw materials of various raw materials that above-mentioned steps adopts consists of: mud: 45 ~ 70%, and fiber: 15 ~ 30%, sizing agent: 15 ~ 30%, lubricant: 0 ~ 5%, sweetening agent: 0 ~ 5%.
As preferably, the weight percent of the shared all raw materials of various raw materials that above-mentioned steps adopts consists of: dirt
Mud: 50 ~ 65%, fiber: 15 ~ 25%, sizing agent: 15 ~ 25%, lubricant: 1 ~ 3%, sweetening agent: 1 ~ 3%.
The weight percent of the shared all raw materials of various raw materials that more preferably, above-mentioned steps adopts consists of:
Mud: 57%, fiber: 20%, sizing agent: 19%, lubricant: 2%, sweetening agent: 2%.
It is de-that the preferred municipal wastewater of described mud, food processing wastewater, paper mill effluent biological treatment process produce
Sewage sludge or be rich in the above-mentioned mud of PHA (PHA) after domestication; One or more in the preferred rice-straw fibre of described fiber, bagasse, wood chip, the leaf of bamboo, cotton seed hulls, old cotton, leaf of Semen Maydis or Chinese medicine slag, adopt when multiple, and the ratio of mixing is not done strict restriction; One or more in described sizing agent preferably polyethylene alcohol, resol, urea-formaldehyde resin or modified starch, adopt when multiple, and the ratio of mixing is not done strict restriction; One or both of the preferred barium stearate of described lubricant or Magnesium Stearate, while adopting two kinds, the ratio of mixing is not done strict restriction; Described sweetening agent preferential oxidation calcium.Preferably, S1 adopts sodium hydroxide, hydrochloric acid soln conditioning of mud pH value to be neutral.Preferably the pH value of conditioning of mud is 6 ~ 8.The preferred 1M of the concentration of hydrochloric acid soln.
Preferably, described the sieving of S2 preferably crossed 5 ~ 10 mesh sieves.
Preferably, the bake out temperature of the described oven dry of S2 is preferably 80 ~ 90 ℃.
Preferably, the Heating temperature of the described high-temperature pressurizing of S4 is that 90 ~ 120 ℃, heat-up time are 1.5 ~ 2h, presses
Power is 24.5 ~ 29.4 MPa.
The present invention provides the disposable degradable mulch film that adopts described preparation method to prepare simultaneously.
The invention has the beneficial effects as follows:
The invention solves the recycling problem of utilizing residual active sludge, the problem of environmental pollution that the mud secondary pollution that especially prior art exists causes, and successfully prepare the disposable degradable mulch film of excellent property,
Reach the purpose of environmental protection and energy saving.
The present invention adopts the mud of vast scale and the fiber of suitable proportion, sizing agent, lubricant and sweetening agent are as raw material, the present invention selects the residual active sludge with gluing effect, select the fiber of proper ratio, make its performance filler and suitable crosslinked action, sizing agent is except bringing into play its gluing effect, after described sizing agent and mud are mixed, also can play mildew-resistant, waterproof action, delay the degradation time of finished product, described lubricant increases the plasticity-of material of the present invention, make the easily demoulding after high-pressure molding, the sweetening agent calcium oxide is the fixing element sulphur of free state in mud on the one hand, free heavy metal element in simultaneously can also passivation mud, make it become insoluble heavy metallic salt, calcium oxide also has the deodorization and sterilization effect in addition, stop finished product by the microorganism fast degradation.The most important thing is, under scientific and reasonable preparation process condition, not only by the recycling sludge utilization, and obtained a kind of mulch film product with excellent tensile strength and excellent ultimate compression strength, excellent combination property.
Because add formaldehyde to mud is crosslinked important help to be arranged, prior art is utilized mud preparation recycling product, often use formaldehyde, but formaldehyde is unfavorable for environmental protection.The present invention has creatively improved technique, first with highly basic or strong acid, adjust mud and be neutral, again by the extremely very rational moisture content scope of sludge dewatering, blend fiber, sizing agent, again adjust the moisture content scope of mixture after lubricant and sweetening agent etc., for the product of follow-up preparation process and final excellent lays the first stone, go out suitable high-temperature pressurizing processing condition in conjunction with the long-term a large amount of experimental summary of the present invention, in the preparation condition gentleness, prepare degradable mulch under shorter condition of time, overcome the fraud place of prior art use formaldehyde, obtained significant progress.
Starting material of the present invention are simple and easy to get; preparation technology is simple; be easy to control; workable, be easy to suitability for industrialized production and good economic benefit is arranged, by the difficult problem of the sludge disposal of method solution cheaply; the disposable degradable mulch film prepared; the alternative current disposable agricultural mulching of gained mulch film, reduce the pollution of waste plastic goods to environment, has broad application prospects and important environment protection meaning.
Embodiment
Further describe the present invention below in conjunction with specific embodiment.The test method of using in following embodiment if no special instructions, is ordinary method; The material used, reagent etc. if no special instructions, are reagent and the material that can obtain from commercial channels.Embodiment 1 the present embodiment mud is the municipal residual active sludge that is taken from Guangzhou municipal wastewater factory, without the direct centrifuge dehydration of domestication to water ratio approximately 80%, be neutral (the pH value is 7 left and right) by sodium hydroxide, hydrochloric acid soln (1M) conditioning of mud pH value, further dry (preferably 80 ~ 100 ℃ of bake out temperatures) and dewater to water content in 40 ~ 70% scope, obtain the mud powder; Rice-straw fibre was pulverized after 5 ~ 10 mesh sieves routinely to alkaline process to come unstuck after drying and collects; By mud powder, rice-straw fibre, polyvinyl alcohol, barium stearate, calcium oxide, be 61: 17: 18 by weight: the ratio mixing of 2: 2 is sent in stirrer and is mixed, and adjusts the mixture moisture content in 50% ~ 60% scope; Taking out mixture is that 90 ~ 120 ℃, heat-up time are that under 1.5 ~ 2h processing condition, pressurization (pressure is 24.5 ~ 29.4 MPa) moulding obtains the disposable degradable mulch film that utilizes residual actived sludge standby in Heating temperature.Embodiment 2 the present embodiment mud are taken from the municipal sludge of Guangzhou municipal wastewater factory, through conventional acclimation method, (be that the scarce phosphorus of nitrogen stress only adds carbon source, adopt the SBR system) obtain being rich in the residual active sludge of PHA (PHA concentration is dry cell weight more than 60%) after domestication, centrifugal treating is to water ratio approximately 80%, be neutral by sodium hydroxide, hydrochloric acid soln (1M) conditioning of mud pH value, further drying and dewatering in 40 ~ 70% scope, obtains the mud powder to water content;
Rice-straw fibre was pulverized after 5 ~ 10 mesh sieves routinely to alkaline process to come unstuck after drying and collects; By mud powder, rice-straw fibre, polyvinyl alcohol, barium stearate, calcium oxide by weight in 57: 20: 19: the ratio mixing of 2: 2, send in stirrer and mix, it is 50% ~ 60% scope that baking mixture makes its moisture content; Then taking out mixture is that 90 ~ 120 ℃, heat-up time are that under 1.5 ~ 2h processing condition, pressurization (pressure is 24.5 ~ 29.4 MPa) moulding obtains the disposable degradable mulch film that utilizes residual actived sludge standby in Heating temperature.Embodiment 3 the present embodiment mud are the mud that is taken from Guangzhou municipal wastewater factory, obtain being rich in the residual active sludge of PHA (PHA concentration is dry cell weight more than 60%) after the domestication of conventional acclimation method, centrifugal treating is to water ratio approximately 80%, be neutral by sodium hydroxide, hydrochloric acid soln (1M) conditioning of mud pH value, further drying and dewatering in 40 ~ 70% scope, obtains the mud powder to water content; Wood fiber was pulverized after 5 ~ 10 mesh sieves routinely to alkaline process to come unstuck after drying and collects; By mud powder, wood fiber, polyvinyl alcohol, Magnesium Stearate, calcium oxide, be 56: 18: 22 by weight: the ratio mixing of 2: 2 is sent in stirrer and is mixed, and it is 50% ~ 60% scope that baking mixture makes its moisture content; Then taking out in Heating temperature is that 90 ~ 120 ℃, heat-up time are that under 1.5 ~ 2h processing condition, pressurization (pressure is 24.5 ~ 29.4 MPa) moulding utilizes the standby disposable degradable mulch film of residual actived sludge.Embodiment 4 the present embodiment mud are the residual active sludge that is taken from Guangzhou food processing plant, without the direct centrifugal treating of domestication to water ratio approximately 80%, be neutral by sodium hydroxide, hydrochloric acid soln (1M) conditioning of mud pH value, further drying and dewatering to water content in 40 ~ 70% scope; Caulis Sacchari sinensis fiber was pulverized after 5 ~ 10 mesh sieves routinely to alkaline process to come unstuck after drying and collects; By mud powder, Caulis Sacchari sinensis fiber, resol, Magnesium Stearate, calcium oxide weight ratio in 53: 25: 18: the ratio of 2: 2 is mixed to send in stirrer and is mixed, and it is 50% ~ 60% scope that baking mixture makes its moisture content; Then taking out in Heating temperature is that 90 ~ 120 ℃, heat-up time are that under 1.5 ~ 2h processing condition, pressurization (pressure is how many 24.5 ~ 29.4 MPa) moulding utilizes the standby disposable degradable mulch film of residual actived sludge.
Embodiment 5
The present embodiment mud is the mud that is taken from Guangzhou food processing plant, obtain being rich in the residual active sludge of PHA (PHA concentration is dry cell weight more than 60%) after the domestication of conventional acclimation method, centrifugal treating is to water ratio approximately 80%, be neutral by sodium hydroxide, hydrochloric acid soln (1M) conditioning of mud pH value, further drying and dewatering in 40 ~ 70% scope, obtains the mud powder to water content;
Old cotton fiber was pulverized after 5 ~ 10 mesh sieves routinely to alkaline process to come unstuck after drying and collects;
By mud powder, old cotton fiber, polyvinyl alcohol, barium stearate, calcium oxide weight ratio in 55: 17: 24: the ratio of 2: 2 is mixed to send in stirrer and is mixed, and it is 50% ~ 60% scope that baking mixture makes its moisture content; Then taking out in Heating temperature is that 90 ~ 120 ℃, heat-up time are pressurization (pressure is 24.5 ~ 29.4 MPa) moulding utilization residue disposable degradable mulch film prepared by victory mud of living under 1.5 ~ 2h processing condition.
Embodiment 6
The present embodiment mud is for being taken from paper mill, Guangzhou mud, obtain being rich in the residual active sludge of PHA (PHA concentration is dry cell weight more than 60%) after the domestication of conventional acclimation method, centrifugal treating is to water ratio approximately 80%, be neutral by sodium hydroxide, hydrochloric acid soln (1M) conditioning of mud pH value, further drying and dewatering in 40 ~ 70% scope, obtains the mud powder to water content; The Chinese medicine slag fiber was pulverized after 5 ~ 10 mesh sieves routinely to alkaline process to come unstuck after drying and collects;
By mud powder, Chinese medicine slag fiber, polyvinyl alcohol, barium stearate, calcium oxide weight ratio in 59: 19: 18: the ratio of 2: 2 is mixed to send in stirrer and is mixed, and it is 50% ~ 60% scope that baking mixture makes its moisture content; Then taking out in Heating temperature is that 90 ~ 120 ℃, heat-up time are that under 1.5 ~ 2h processing condition, pressurization (pressure is 24.5 ~ 29.4 MPa) moulding utilizes the standby disposable degradable mulch film of residual actived sludge.
Embodiment 7 the present embodiment mud are taken from the residual active sludge in paper mill, Guangzhou, without the direct centrifugal treating of domestication to water ratio approximately 80%, be neutral by sodium hydroxide, hydrochloric acid soln (1M) conditioning of mud pH value, further drying and dewatering in 40 ~ 70% scope, obtains the mud powder to water content; Leaf of bamboo fiber was pulverized after 5 ~ 10 mesh sieves routinely to alkaline process to come unstuck after drying and collects; By mud powder, leaf of bamboo fiber, polyvinyl alcohol, barium stearate, calcium oxide, be 60: 18: 18 by weight: the ratio mixing of 2: 2 is sent in stirrer and is mixed, and it is 50% ~ 60% scope that baking mixture makes its moisture content; Then taking out in Heating temperature is that 90 ~ 120 ℃, heat-up time are that under 1.5 ~ 2h processing condition, pressurization (pressure is 24.5 ~ 29.4 MPa) moulding utilizes the standby disposable degradable mulch film of residual actived sludge.
Embodiment 8
The present embodiment mud is taken from the municipal sludge of Guangzhou municipal wastewater factory, through conventional acclimation method, (be that the scarce phosphorus of nitrogen stress only adds carbon source, adopt the SBR system) obtain being rich in the residual active sludge of PHA (PHA concentration is dry cell weight more than 60%) after domestication, centrifugal treating is to water ratio approximately 80%, be neutral by sodium hydroxide, hydrochloric acid soln (1M) conditioning of mud pH value, further drying and dewatering in 35% left and right, obtains the mud powder to water content;
Rice-straw fibre was pulverized after 5 ~ 10 mesh sieves routinely to alkaline process to come unstuck after drying and collects; By mud powder, rice-straw fibre, polyvinyl alcohol, barium stearate, calcium oxide by weight in 57: 20: 19: the ratio mixing of 2: 2, send in stirrer and mix, it is 65% left and right that baking mixture makes its moisture content; Then taking out mixture is that 80 ℃, heat-up time are that under 1.5 ~ 2h processing condition, pressurization (pressure is 22MPa) moulding can utilize the standby disposable degradable mulch film of residual actived sludge in Heating temperature.But gained mulch film formability is poor, the local moisture content of goods is excessive, fails good crosslinked fusion because temperature is low.Goods are softer, place at normal temperatures after for some time yieldingly, and, with stench flavor, there is pore on surface, poor mechanical property.
Embodiment 9
The disposable degradable mulch film that above-described embodiment 1 ~ 7 obtains, all formaldehydeless detecting.Described disposable degradable mulch film is measured to its tensile strength to be undertaken by GB/T 1040.2-2006 standard, ultimate compression strength is undertaken by GB/T 1935-1991 standard, water-intake rate is undertaken by GB/T 1034-1998 standard, total plate count is undertaken by GB 4789.2-2010 standard, and the intestinal bacteria sum is pressed GB 4789.3-2010.The degradation property experiment is the disposable degradable mulch film that above-described embodiment is prepared, and is placed in respectively normal temperature laboratory environment, indoor open-air atmosphere, is buried in soil and is buried in mud, its integrity of routine observation and weightless situation.And record the time required when the mulch film rate of weight loss reaches 80% left and right.Measurement result is as shown in the table:
Table 1: disposable degradable mulch film indices parameter (unit: month)
Table 2: degradation time (weightless 80 the %s) (unit: the moon) of disposable degradable mulch film in varying environment
From the experimental data of table 1 and table 2, the disposable degradable mulching film stretching intensity that adopts the present invention to prepare and ultimate compression strength are all more than 10.00MP, and total plate count and intestinal bacteria sum are all in safety range, and degradation time is also in desired extent.Wherein in each embodiment, with the disposable degradable mulch film in embodiment 2, embody excellent tensile strength and ultimate compression strength, water-intake rate, total plate count, intestinal bacteria sum minimum,
For optimum embodiment, be applicable to prepare the disposable degradable mulch film.
Carry out the mulch film application test with the above-mentioned embodiment 2 that embodies excellent tensile strength and ultimate compression strength, on embodiment 2 degradable mulchs, spile, by the Plantula Brassicae chinensis seed sowing in aperture soil, fiddle with earth and make it even, before germinateing, water every day, after germinateing, seedling is careful waters, and during Growth of Cabbage, measures by the degraded situation of the temperature of degradable mulch mulching soil (0 ~ 10cm is dark), water-content and degradable mulch, with common ground
Film (polythene material) is example in contrast, and measurement result is as shown in table 3:
Table 3 disposable degradable mulch film application test
In sum, the inventive method is scientific and reasonable, starting material are simple, and preparation technology is simple, are easy to control, workable, production efficiency is high, and the difficult problem by the sludge disposal of method solution cheaply, prepare the disposable degradable mulch film, can partly substitute current disposable plastic mulch film, reduce the pollution of current plastics to environment.The present invention provides new way for the residual active sludge resource utilization, can not only turn waste into wealth, and reduces residue and lives
The environmental pollution that property mud causes, have broad application prospects.
Claims (9)
1. a method of utilizing the standby degradable mulch of residual actived sludge, is characterized in that, comprises the following steps: the pH value of S1. conditioning of mud raw material is neutral, and oven dry sludge dewatering in 40 ~ 70% scopes, obtains the mud powder to water content;
S2. filamentary material is pulverized, sieved, the boiling post-drying of coming unstuck is collected;
S3. filamentary material and sizing agent, lubricant and desulphurizer mixing that mud powder S1 prepared, S2 collect evenly obtain mixture, adjust the mixture moisture content in 50% ~ 60% scope;
S4. mixture high-temperature pressurizing moulding S3 prepared, obtain degradable mulch;
Wherein, the weight percent of the shared all raw materials of various raw materials that above-mentioned steps adopts consists of: mud: 45 ~ 70%, and fiber: 15 ~ 30%, sizing agent: 15 ~ 30%, lubricant: 0 ~ 5%, sweetening agent: 0 ~ 5%.
2. utilize according to claim 1 the method for the standby degradable mulch of residual actived sludge, it is characterized in that, the weight percent of the shared all raw materials of various raw materials of described employing consists of: mud: 50 ~ 65%, fiber: 15 ~ 25%, sizing agent: 15 ~ 25%, lubricant: 1 ~ 3%, sweetening agent: 1 ~ 3%.
3. utilize according to claim 2 the method for the standby degradable mulch of residual actived sludge, it is characterized in that, the weight percent of the shared all raw materials of various raw materials of described employing consists of: mud: 57%, fiber: 20%, sizing agent: 19%, lubricant: 2%, sweetening agent: 2%.
4. utilize according to claim 1 the method for the standby degradable mulch of residual actived sludge, it is characterized in that, it is 6 ~ 8 that the pH value of described conditioning of mud raw material is neutral pH value.
5. utilize according to claim 1 the method for the standby degradable mulch of residual actived sludge, it is characterized in that, S1 adopts sodium hydroxide, hydrochloric acid soln (1M) conditioning of mud pH value to be neutral.
6. utilize according to claim 1 the method for the standby degradable mulch of residual actived sludge, it is characterized in that, described the sieving of S2 was 5 ~ 10 mesh sieves.
7. utilize according to claim 1 the method for the standby degradable mulch of residual actived sludge, it is characterized in that, the bake out temperature of the described oven dry of S2 is preferably 80 ~ 90 ℃.
8. utilize according to claim 1 the method for the standby degradable mulch of residual actived sludge, it is characterized in that, the Heating temperature of the described high-temperature pressurizing of S4 is that 90 ~ 120 ℃, heat-up time are 1.5 ~ 2h, and pressure is 24.5 ~ 29.4 MPa.
9. the disposable degradable mulch film that the described method of utilizing the standby degradable mulch of residual actived sludge of claim 1 to 8 prepares.
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| CN104530596A (en) * | 2014-12-24 | 2015-04-22 | 浙江理工大学 | Method for producing degradable plastics by using activated sludge |
| CN105647217A (en) * | 2016-03-11 | 2016-06-08 | 朱彩玲 | Method using bagasse to produce degradable plastic wraps |
| CN110557940A (en) * | 2017-03-29 | 2019-12-10 | Scg包装股份有限公司 | Soil covering material with structural layer |
| CN110800572A (en) * | 2019-11-18 | 2020-02-18 | 安徽省舒城县舒丰现代农业科技开发有限责任公司 | Yield-increasing and efficiency-improving asparagus cultivation method |
| CN112300595A (en) * | 2020-11-30 | 2021-02-02 | 甘肃济洋塑料有限公司 | Environment-friendly full-biodegradable mulching film and preparation method thereof |
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| CN85102687A (en) * | 1985-04-03 | 1986-10-01 | 上海市房屋管理科学技术研究所 | Protein plastics made from residual actived sludge |
| CN102079851A (en) * | 2010-11-25 | 2011-06-01 | 华南农业大学 | Disposable degradable material produced by using residual active sludge and preparation method thereof |
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