CN108503188A - A kind of processing of deeply dehydrating sludge and its additive recovery method - Google Patents
A kind of processing of deeply dehydrating sludge and its additive recovery method Download PDFInfo
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- CN108503188A CN108503188A CN201810390673.0A CN201810390673A CN108503188A CN 108503188 A CN108503188 A CN 108503188A CN 201810390673 A CN201810390673 A CN 201810390673A CN 108503188 A CN108503188 A CN 108503188A
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- sludge
- supersaturated solution
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a kind of processing of deeply dehydrating sludge and its additive recovery methods, according to parts by weight, pending mud is mixed for 100 parts at ambient temperature with solid inorganic salt or its supersaturated solution, it mixes and stands 10 30min after mixed 10~30min, wherein the addition of solid inorganic salt or its supersaturated solution is 10% the 50% of sludge weight；Then mixing sludge is separated by solid-liquid separation using mechanism filter-pressing mode, recycles after the filtrate isolated is concentrated to give supersaturated solution and reuses.Deep dehydration method for sludge of the present invention can make sludge carry out deep dehydration on the basis of not adding toxic harmful chemicals, not increasing energy consumption substantially and do not increase new equipment, have higher economic benefit, social environment benefit and larger market application prospect.
Description
Technical field
The invention belongs to environmental projects and technical field of sludge treatment, and in particular to a kind of deep dehydration method for sludge and its
Additive recovery method.
Background technology
In recent years, China achieves significant progress in terms of sewage disposal, and urban wastewater treatment firm plays wherein
Vital effect alleviates the water pollution crisis in China to a certain extent.However, the sludge that sewage disposal process generates
Problem also becomes increasingly conspicuous.Industrial-Enterprises in China sewage treatment plant also plays extremely important during alleviating water pollution crisis simultaneously
Effect, resulting industrial sludge problem also becomes increasingly conspicuous.Sludge contain a large amount of hardly degraded organic substances, heavy metal, other
Possible poisonous and harmful substance and pathogenic microorganism and worm's ovum etc., if serious secondary pollution will be caused by not dealing carefully with.
Excess sludge, i.e., the sludge generated after sewage disposal, most important feature are exactly moisture content height, even as high as
99%, realize that sludge reduction most direct method is exactly the moisture effectively removed in sludge.Due to organic matter in sludge and water
The presence of interaction causes dewatering performance of sludge very poor, directly carries out mechanical dehydration, and moisture content of the cake is still up to 80% or so,
This is well below China's solid refuse standard of landfill, therefore the moisture content for reducing sludge seems particularly critical (hereafter described sludge
Sludge for aqueous 80% or so).
Currently, common mud dewatering method has oven drying method, Fenton reagent method, hydro-thermal method etc..Oven drying method is using heating
Method make a kind of method that the moisture in sludge is quickly evaporated, although dehydration efficiency is high, dewatered sludge is aqueous
Rate can drop to very low, but invest larger, and operating cost is higher, the volatile organic matter of generation to surrounding environment influence compared with
Greatly.In Fenton reagent method and various derivative Fenton reagent methods, core concept is to be aoxidized extracellular polymeric with oxide
Realize effective dehydration, the disadvantage is that effectively reducing moisture percentage in sewage sludge to reach, Fenton reagent input amount is relatively large, causes cost
Relatively large therefore relatively fewer in commercial Application at present, Fenton reagent method is relatively more in sewage disposal stage.In hydro-thermal method
In, by heating sludge in confined conditions, organic matter in sludge is promoted to hydrolyze to water under certain temperature and pressure
Xiang Zhong destroys activated sludge floc structure to reach, improves a kind of method of dewatering performance of sludge, ordinary circumstance, with temperature
Raising, dewatering performance of sludge can improve, and common temperature range is at 150 degree~200 degree.Partial monopoly reports addition part
The scheme of inorganic salts progress deeply dehydrating sludge, CN 103663920A, CN 105314815A and CN 102108003A,
Matter is that Cabase compound carries out sludge dewatering.Such as microwave method, ultrasonic method, steam explosion method in other schemes reported at present
Deng still distant apart from real industrial applications distance although can effectively carry out sludge dewatering in these methods.
Invention content
The problems such as low for above-mentioned existing sludge dewatering efficiency, issuable secondary environmental pollution, the present invention provide one
The method that kind carries out sludge dewatering at normal temperatures and pressures, dehydration rate is high, at low cost, and industrial applications rate is high.
To achieve the goals above, technical scheme is as follows：A kind of processing of deeply dehydrating sludge and its additive
Recovery method, the method for carrying out sludge dewatering as additive using inorganic salts or its supersaturated solution, steps are as follows：
1) it at normal temperatures and pressures, according to parts by weight, is added and adds in 100 parts of the pending mud of moisture content 80~85%
Add agent, being slowly stirred 10-30min makes it be sufficiently mixed, and stands 10-30min and obtain mixing sludge, and the additive is inorganic
Salt solid or its supersaturated solution, wherein the addition of additive is the 10%-50% of pending mud weight, wherein described
Inorganic salts are that ammonium nitrate, ammonium chloride, zinc chloride, ammonium formate and ammonium thiocyanate are one such or several；
2) mixing sludge that step 1) obtains is imported in filter-pressing device and is carried out dehydrating, obtained filtrate and dehydration is dirty
Mud；
3) filtrate that step 2) obtains is imported in evaporator after being evaporated concentration until appearance is muddy in filtrate and is stopped,
Cloudy filtrates are recycled to recycle as recycling inorganic salts supersaturated solution；
Further, filter-pressing device used is plate and frame filter press.
Further, mixing sludge is imported before filter-pressing device is carried out dehydrating and can be wanted according to filter press in the step 2)
Ask addition recycling inorganic salts supersaturated solution sludge agitation pulp, the additive amount of the inorganic salts supersaturated solution is to wait locating
Manage the 10%~20% of sludge weight.
Compared with prior art, the present invention has the following advantages：The deeply dehydrating sludge of the present invention and additive recycling side
Method is fairly simple, using existing sludge press filtration system and concentration and evaporation system, be directly added into sludge inorganic salts solid or
Its supersaturated solution is sufficiently stirred mixing, then directly carries out being separated by solid-liquid separation acquisition filter cake and filtrate, dehydration does not increase solid
Fixed investment；Simple for process, economic risk is small；Can be used as the secondary use of additive after filtrate recycling concentration, reduce sludge dewatering at
This, and the non-secondary pollution in entire dehydration, while additive of the present invention is general industry product, is easy to buy, price is low
It is honest and clean；The deeply dehydrating sludge and additive recovery method of the present invention carries out at normal temperatures and pressures, and dehydration rate is high, at low cost, has
Very strong industrial applications foreground.
Specific implementation mode
Detailed specific description is done to the present invention with reference to specific embodiment, sludge of the present invention is municipal sludge
Or industrial sludge, additive are common industrial goods, are easy to buy, it is cheap.
Embodiment 1：Under normal temperature and pressure, according to parts by weight, 100 parts of 85% industrial sludge of moisture content (pesticide sludge) is taken,
20 parts of solid ammonium nitrate is added, is slowly stirred 10min, and stand 20min, mixing sludge is made；Add the ammonium nitrate of recycling
10 parts of supersaturated solution uses plate and frame filter press filter-press dehydration after being thoroughly mixed, obtain the pesticide sludge that moisture content is 45%
Filter cake and filtrate are recycled filtrate and are stopped after carrying out concentration in triple effect multi-stage evaporator until there is muddiness in filtrate, recycles
Cloudy filtrates are as recycling ammonium nitrate supersaturated solution in case the later stage is reused, wherein in recycling ammonium nitrate supersaturated solution
The rate of recovery of ammonium nitrate is 40% (in terms of ammonium nitrate solid).
Embodiment 2：Under normal temperature and pressure, according to parts by weight, 100 parts of 80% industrial sludge of moisture content (pesticide sludge) is taken,
50 parts of solid ammonium chloride is added, is slowly stirred 30min, and stand 30min, mixing sludge is made；Add the ammonium chloride of recycling
20 parts of supersaturated solution uses plate and frame filter press filter-press dehydration after being thoroughly mixed, obtain the pesticide sludge that moisture content is 38%
Filter cake and filtrate are recycled filtrate and are stopped after carrying out concentration in triple effect multi-stage evaporator until there is muddiness in filtrate, recycles
Cloudy filtrates are as recycling ammonium chloride supersaturated solution in case the later stage is reused, wherein in recycling ammonium chloride supersaturated solution
The rate of recovery of ammonium chloride is 50% (in terms of chloride solid).
Embodiment 3：Under normal temperature and pressure, according to parts by weight, 85% industrial sludge of moisture content (polyurethane sludge) 100 is taken
Part, 30 parts of solid ammonium thiocyanate is added, is slowly stirred 20min, and stand 10min, mixing sludge is made；Add the sulphur of recycling
20 parts of ammonium cyanate supersaturated solution uses plate and frame filter press filter-press dehydration after being thoroughly mixed, obtain moisture content be 45% it is poly-
Urethane sludge filter cake and filtrate are recycled filtrate and are stopped after carrying out concentration in triple effect multi-stage evaporator until there is muddiness in filtrate
Only, recycling cloudy filtrates are used as recycling ammonium thiocyanate ammonium supersaturated solution in case the later stage is reused, wherein recycling ammonium thiocyanate
The rate of recovery of ammonium thiocyanate is 50% (in terms of ammonium thiocyanate solid) in ammonium supersaturated solution.
Embodiment 4：Under normal temperature and pressure, according to parts by weight, 85% industrial sludge of moisture content (polyurethane sludge) 100 is taken
Part, solid formic acid ammonium and ammonium thiocyanate mixture (mass ratio 1 is added:1) 10 parts, it is slowly stirred 10min, and stand 10min, made
Obtain mixing sludge；The ammonium formate of recycling and 20 parts of the supersaturated solution of ammonium thiocyanate mixture are added, ingredient is filled and is stirred
Plate and frame filter press filter-press dehydration is used afterwards, obtains polyurethane sludge filter cake and the filtrate that moisture content is 55%, recycles filtrate and three
Stop after carrying out concentration until there is muddiness in filtrate in effect multi-stage evaporator, recycling cloudy filtrates are as recycling ammonium formate and sulphur
The supersaturated solution of ammonium cyanate mixture is in case later stage reuse, wherein the mistake of recycling ammonium formate and ammonium thiocyanate mixture
The rate of recovery of ammonium formate and ammonium thiocyanate mixture is recycled in saturated solution (to mix to recycle ammonium formate and ammonium thiocyanate for 45%
Object solid meter).
Embodiment 5：Under normal temperature and pressure, according to parts by weight, 100 parts of 80% municipal sludge of moisture content is taken, solid first is added
50 parts of sour ammonium, is slowly stirred 20min, and stand 30min, and mixing sludge object is made；The ammonium formate supersaturation for adding recycling is molten
10 parts of liquid uses plate and frame filter press filter-press dehydration after being thoroughly mixed, obtain municipal sludge filter cake and the filter that moisture content is 53%
Liquid recycles filtrate and stops after carrying out concentration in triple effect multi-stage evaporator until there is muddiness in filtrate, recycles cloudy filtrates
As recycling ammonium formate supersaturated solution in case the later stage is reused, wherein ammonium thiocyanate in recycling ammonium formate supersaturated solution
The rate of recovery be 40% (in terms of ammonium thiocyanate solid).
Embodiment 6：Under normal temperature and pressure, according to parts by weight, 100 parts of 85% municipal sludge of moisture content is taken, zinc chloride is added
30 parts of supersaturated solution is slowly stirred 30min and stands 10min, and mixing sludge object is made；Then use plate and frame filter press press filtration de-
Water obtains municipal sludge filter cake and the filtrate that moisture content is 58%, recycles filtrate and is concentrated in triple effect multi-stage evaporator
Until stopping after appearance is muddy in filtrate, recycling cloudy filtrates are as recycling zinc chloride supersaturated solution in case later stage repetition makes
With, wherein the rate of recovery of zinc chloride is 30% (in terms of zinc chloride solid) in recycling zinc chloride supersaturated solution.
Embodiment 7：Under normal temperature and pressure, according to parts by weight, 100 parts of 80% municipal sludge of moisture content is taken, solid nitre is added
Sour ammonium and ammonium chloride mixt (mass ratio 1:1) it 10 parts, is slowly stirred 10min and stands 20min, mixing sludge is made；Again plus
Enter to recycle 20 parts of ammonium nitrate and ammonium chloride mixt supersaturated solution, plate and frame filter press filter-press dehydration used after being thoroughly mixed,
Obtain moisture content be 42% municipal sludge filter cake and filtrate, recycle filtrate and carried out in triple effect multi-stage evaporator concentration until
Occur in filtrate it is muddy after stop, recycling cloudy filtrates as recycling ammonium nitrate and ammonium chloride mixt supersaturated solution in case after
Phase is reused, wherein time of ammonium nitrate and ammonium chloride mixt in recycling ammonium nitrate and ammonium chloride mixt supersaturated solution
Yield 35% (in terms of ammonium nitrate and ammonium chloride mixt solid).
Embodiment 8：Under normal temperature and pressure, according to parts by weight, 100 parts of 80% municipal sludge of moisture content is taken, solid nitre is added
10 parts of sour ammonium is slowly stirred 10min and stands 10min, and mixing sludge is made；Then plate and frame filter press press filtration is used, is obtained aqueous
Rate is filter cake and the filtrate of 50% municipal sludge, recycles filtrate and carries out concentration in triple effect multi-stage evaporator until going out in filtrate
Stop after existing muddiness, recycling cloudy filtrates are as recycling ammonium nitrate supersaturated solution in case the later stage is reused, wherein recycle nitre
The rate of recovery 28% of ammonium nitrate in sour ammonium supersaturated solution (in terms of ammonium nitrate solid).
Claims (3)
1. a kind of deeply dehydrating sludge processing and its additive recovery method, using inorganic salts or its supersaturated solution as addition
Agent carries out sludge dewatering, and steps are as follows：
1) under normal temperature and pressure, according to parts by weight, additive is added in 100 parts of the pending mud of moisture content 80~85%,
Being slowly stirred 10-30min makes it be sufficiently mixed, and stands 10-30min and obtain mixing sludge, and the additive is solid for inorganic salts
Body or its supersaturated solution, the addition of additive are the 10%-50% of pending mud, wherein the inorganic salts are nitric acid
Ammonium, ammonium chloride, zinc chloride, ammonium formate and ammonium thiocyanate are one such or several；
2) mixing sludge that step 1) obtains is imported in filter-pressing device and is carried out dehydrating, obtain filtrate and dewatered sludge filter
Cake；
3) filtrate that step 2) obtains is imported in evaporator after being evaporated concentration until appearance is muddy in filtrate and is stopped, being recycled
Cloudy filtrates are recycled as recycling inorganic salts supersaturated solution.
2. a kind of deeply dehydrating sludge processing according to claim 1 and its additive recovery method, which is characterized in that institute
It is plate and frame filter press to state filter-pressing device.
3. a kind of deeply dehydrating sludge processing according to claim 1 and its additive recovery method, which is characterized in that institute
It states in step 2) mixing sludge and imports addition recycling inorganic salts supersaturated solution before filter-pressing device is carried out dehydrating and sludge is mixed
Pulpous state is synthesized, the additive amount of the inorganic salts supersaturated solution is the 10%~20% of pending mud weight.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810390673.0A CN108503188A (en) | 2018-04-27 | 2018-04-27 | A kind of processing of deeply dehydrating sludge and its additive recovery method |
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| CN201810390673.0A CN108503188A (en) | 2018-04-27 | 2018-04-27 | A kind of processing of deeply dehydrating sludge and its additive recovery method |
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| CN108503188A true CN108503188A (en) | 2018-09-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112430146A (en) * | 2020-11-06 | 2021-03-02 | 湖北宸扬生物环保科技有限公司 | Method for sludge dewatering and synchronous production of solid-liquid nitrogen fertilizer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5898200A (en) * | 1981-12-03 | 1983-06-10 | Mitsubishi Heavy Ind Ltd | Dehydration of sludge |
| DE10040265A1 (en) * | 2000-08-17 | 2002-03-07 | Schumann Walter | Modular apparatus for removing heavy metals from sludges or waste water comprises a mobile adsorber containing manganese, aluminum or titanium oxide |
| CN102849918A (en) * | 2012-10-09 | 2013-01-02 | 浙江大学 | Treatment method for strengthening dewatering performance of excess activated sludge |
| CN104671623A (en) * | 2015-02-04 | 2015-06-03 | 福建省洋屿化工工贸有限公司 | Osmotic treatment process of municipal sewage sludge |
-
2018
- 2018-04-27 CN CN201810390673.0A patent/CN108503188A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5898200A (en) * | 1981-12-03 | 1983-06-10 | Mitsubishi Heavy Ind Ltd | Dehydration of sludge |
| DE10040265A1 (en) * | 2000-08-17 | 2002-03-07 | Schumann Walter | Modular apparatus for removing heavy metals from sludges or waste water comprises a mobile adsorber containing manganese, aluminum or titanium oxide |
| CN102849918A (en) * | 2012-10-09 | 2013-01-02 | 浙江大学 | Treatment method for strengthening dewatering performance of excess activated sludge |
| CN104671623A (en) * | 2015-02-04 | 2015-06-03 | 福建省洋屿化工工贸有限公司 | Osmotic treatment process of municipal sewage sludge |
Non-Patent Citations (1)
| Title |
|---|
| 全国勘察设计注册工程师环保专业管理委员会、中国环境保护产业协会编: "《注册环保工程师专业考试复习教材 固体废弃物处理处置工程技术与实践 上 第4版》", 31 March 2017, 中国环境出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112430146A (en) * | 2020-11-06 | 2021-03-02 | 湖北宸扬生物环保科技有限公司 | Method for sludge dewatering and synchronous production of solid-liquid nitrogen fertilizer |
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Application publication date: 20180907 |