CN102464425B - Two-stage coagulation and biological co-processing technology of PVC acid-alkali wastewater - Google Patents
Two-stage coagulation and biological co-processing technology of PVC acid-alkali wastewater Download PDFInfo
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- CN102464425B CN102464425B CN 201010533707 CN201010533707A CN102464425B CN 102464425 B CN102464425 B CN 102464425B CN 201010533707 CN201010533707 CN 201010533707 CN 201010533707 A CN201010533707 A CN 201010533707A CN 102464425 B CN102464425 B CN 102464425B
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Abstract
The invention discloses a two-stage coagulation and biological co-processing technology of PVC acid-alkali wastewater, comprising the following steps of: adjusting pH value of the PVC acid-alkali wastewater to be processed to 8.5-9.5, and adding 0.3-1.2% of a coagulant and 0.01-0.03% of a coagulant aid; adjusting the pH value to 9.5-10.5, and adding 0.3-0.6% of a coagulant and 0.01-0.03% of a coagulant aid; successively carrying out a first-stage biological treatment and a second-stage biological treatment on the PVC acid-alkali wastewater which has undergone the two-stage coagulation treatment; then carrying out solid-liquid separation and finally discharging the processed PVC acid-alkali wastewater. According to the invention, the technology solves the problems of no solid-liquid separation and internal sludge backflow. The possibility of independent application of a single device is increased. Land occupation and investment are minimized. Operation cost is reduced. The problem of sludge backflow can be solved in one device and the processing effect is more stable and reliable. The operation is convenient and maintenance is simple.
Description
Technical field
The present invention relates to the high saliniferous acidic and alkaline waste water of chemical industry treatment process field, relate in particular to a kind of collaborative biological treatment of classification coagulation of the PVC of being used for acidic and alkaline waste water.
Background technology
Igelite in the chemical industry (PVC) has good anti-corrosion, be difficult for by corrosion such as concentrated hydrochloric acid, phosphoric acid, hydrogen fluoride, concentrated bases, and it is stable in most of acid-base salt solution.Characteristics such as the PVC acidic and alkaline waste water has supersalinity, is difficult to biological degradation, complicated component, in the processing reuse process of PVC acidic and alkaline waste water, if adopt conventional biological treatment or coagulating treatment technology to be difficult to reach treatment effect preferably separately, and processing efficiency is low, power consumption is high, make the treatment project of a lot of type enterprises or similar dirty waste water feel the difficulty of sewage disposal, and difficult processing cost of bearing.
In order to guarantee that the water quality of discharging water body reaches certain standard, consider expenses such as investment and running cost simultaneously, biological treatment is first-selected treatment technology and method.Biological treatment will reduce insoluble COD content just must or create anaerobism, anoxic, zone such as aerobic in the space of reactor on the time, ensure the required hydraulic detention time of biodegradability of difficult degradation COD, prolongs the time of its acidication.Some technology reached more than 48 hours, and capital cost and working cost are all higher.
Summary of the invention
The two-stage coagulation that the invention provides a kind of PVC of being used for acidic and alkaline waste water is handled and the biological treatment process combined, has improved inorganic substance and organic clearance in the PVC acidic and alkaline waste water.
A kind of PVC acidic and alkaline waste water two-stage coagulation and biological synergetic treatment process comprise the steps:
(1) two-stage coagulation is handled:
First step coagulating treatment:
Add alkali lye in pending PVC acidic and alkaline waste water, the pH value of regulating the PVC acidic and alkaline waste water adds 0.3%～1.2% coagulating agent FeSO to 9-10
4With 0.01%～0.03% coagulant aids PAM (polyacrylamide, Polyacrylamide).
Second stage coagulating treatment: in through the PVC acidic and alkaline waste water after the first step coagulating treatment, add alkali lye, regulate PVC acidic and alkaline waste water pH value to 10-11, add 0.3%～0.6% coagulating agent PAC (polymerize aluminum chloride, Polyaluminium Chloride) and 0.01%～0.03% coagulant aids HCA (positively charged ion coagulant aids-polymerization dimethyl diallyl ammonium chloride) or PAM, the organic monomer that is difficult to remove under low pH is separated out from the PVC acidic and alkaline waste water;
Wherein said coagulating agent, coagulant aids all are to be benchmark with pending PVC acidic and alkaline waste water total mass, add by mass percentage.
Described alkali lye is generally adopted the chemical plant waste lye NaOH that concentration is 2～10g/L, or mass percent concentration is 3～8% liming alkali lye.
Can according to circumstances filter after first step coagulating treatment is finished, filtrate (through the PVC acidic and alkaline waste water after the first step coagulating treatment) enters second stage coagulating treatment then.
(2) biological treatment:
To carry out first step biological treatment and second stage biological treatment through the PVC acidic and alkaline waste water that two-stage coagulation is handled successively; Carry out the PVC acidic and alkaline waste water discharging after solid-liquid separation will be handled then.
Can according to circumstances filter after two-stage coagulation is finished dealing with, filtrate (through the PVC acidic and alkaline waste water of two-stage coagulation processing) enters biological treatment then.
The first step biological treatment work period is 3 hours;
The second stage biological treatment work period is 5 hours, and wherein water inlet (aeration) is 2.5 hours, and solid-liquid separation 2 hours precipitates 0.5 hour.
Wherein said first step biological treatment is to utilize active sludge that waste water is handled.
The biological treatment of the described second stage is to utilize swimming biofilm packing and active sludge that waste water is handled.As preferably, utilize aerated conduit to carry out aeration during the biological treatment of the described second stage.
Described swimming biofilm packing can adopt the commercially available prod, the Biofringe biologic packing material (BF) that for example adopts Japanese NET Co., Ltd. to provide, long 520mm, D 100mm, specific surface area 3410m
2/ m
3, constitute by acrylic fibers, be the radioactivity linear structure.
After carrying out described solid-liquid separation, the PVC acidic and alkaline waste water after obtaining mud and handling, and this mud still has certain activity, as preferably, is back to first step biological treatment stage to major general's part mud and reuses.
In the biological treatment process of step (2), adopt biological treatment tank, as preferably, the biological treatment tank that the present invention adopts is by the annular internal partition wall and be in the outer partition wall of its peripheral annular and surround, wherein internal partition wall institute area surrounded is inner biotic district, and the zone between outer partition wall and the internal partition wall is the outside biotic district of annular.
Be full of active sludge in the inner biotic district, be used for described first step biological treatment, dividing plate is stamped at top, inner biotic district, and the dividing plate that sewage water inlet pipe passes the top enters in the inner biotic district, and extends to bottom, inner biotic district.
In the outside biotic district swimming biofilm packing and active sludge are housed, are used for the biological treatment of the described second stage, the bottom in the outside biotic district is provided with aerated conduit.
The internal partition wall top is provided with water outlet, when inner biotic district liquid level reaches this water outlet, and can be by the water outlet overflow to outside biotic district.Internal partition wall bottom is provided with flashboard, is communicated with in inner biotic district and the outside biotic district when flashboard is opened.
In the outside biotic district of annular, mark off the subregion, be used to carry out described solid-liquid separation, but be open between settling section and the outside biotic district, be provided with the honeycomb inclined-tube filler in the settling section, can improve processing power and speed as settling section.
The outer partition wall top adjacent with settling section is provided with water outlet, when the waste water liquid level after the processing in the outer settling section reaches this water outlet, discharges biological treatment tank by water outlet.
The outer partition wall top base adjacent with settling section is provided with mud return line, mud return line is drawn biological treatment tank from the bottom of settling section, lead to inner biotic district then, the top, biotic district extend in the inner biotic district internally, and extends to bottom, inner biotic district.
During biological treatment tank work, the PVC acidic and alkaline waste water of handling through two-stage coagulation enters the inner biotic district from the top by sewage water inlet pipe, water outlet by the internal partition wall top after finishing dealing with drains in the outside biotic district, progress into settling section after externally finishing dealing with in the biotic district and carry out sedimentation, and the waste water that is in after the processing on upper strata is discharged biological treatment tank by the water outlet at outer partition wall top, a mud part that is in lower floor is passed through mud return line, row reuses in inner biotic district, and a part is discarded by the branch road discharging of mud return line.
Inner biotic district utilizes top spacer to seal, and forms the anaerobic zone in the treating processes, the open setting in outside biotic district, and a large amount of aeration, and when flowing out outward, along with the increase of dissolved oxygen content, the experience anoxic has arrived oxygen condition to waste water by interior.
Certainly, for the whole process that realizes carrying out a biological disposal upon, biological treatment tank also can other forms of the prior art.
The invention solves in the past the problem that self no solid-liquid separation and inner mud reflux, increased the possibility of the independent utility of single assembly, reduced and taken up an area of and investment, reduced running cost.Owing in a device, just can solve the problem that mud refluxes, also can obtain simultaneously comparatively accurately and the control that is more prone to, make treatment effect more stable.
The present invention has adopted the swimming biofilm packing, bigger increase biomass, and make biology have more activity, biophase is also more rich and varied.
There is a certain distance in the present invention to the application of the dirty waste water of different quality, be particularly suitable for the processing of the trade effluent of difficult for biological degradation, generally can improve processing efficiency 18%～30%, than not with the device of solid-liquid separation and internal reflux, can reduce working cost 5%～13%, reduce investment 8%～12%; And treatment effect is stable more and reliable, easy to operate, safeguards simple.
The present invention is used for the obvious processing effect of PVC acidic and alkaline waste water, can effectively reduce investment and processing costs, and removal effect is stable, especially better to the processing of hard-degraded substance in the waste water.Compare with uniprocessing, can improve processing efficiency 20%～27%, reduce processing costs 12%.‘
Embodiment
Embodiment 1
Adding mass percent concentration and be 6% liming alkali lye in certain produces PVC acidic and alkaline waste water in the chemical enterprise of PVC, to regulate the pH value scope of waste water be 9-10, and add 0.6% coagulating agent FeSO
4With 0.03% coagulant aids PAM;
Carry out second stage coagulating treatment then: add mass percent concentration once more and be 6% liming alkali lye and regulate waste water ph to 10-11, and add 0.4% coagulating agent PAC and 0.02% coagulant aids HCA (positively charged ion coagulant aids), the organic monomer that is difficult to remove under low pH is separated out from waste water.
Wherein coagulating agent, coagulant aids all are to be benchmark with pending PVC acidic and alkaline waste water total mass, add by mass percentage.
To enter the biotic district, inside of annular biological treatment tank through the PVC acidic and alkaline waste water that two-stage coagulation is handled, and utilize active sludge to carry out first step biological treatment, its work period is 4 hours; Enter the outside biotic district of the annular that is in periphery, inner biotic district after the processing, utilize swimming biofilm packing and active sludge to carry out second stage biological treatment, its work period is 4 hours (water inlet, aerations 2.5 hours, solid-liquid separation 2 hours, precipitate 0.5 hour), enter settling section in the outside biotic district at last, under the honeycomb inclined-tube effect, carry out solid-liquid separation, the back up to standard after testing discharging of PVC acidic and alkaline waste water after isolated liquid phase is promptly handled, isolated solid phase sludge is partly refluxed to the recycling of first step biological treatment stage.
The present invention utilizes two biotic active sludge and microbial film associated treatment, enter settling section again and carry out solid-liquid separation, can give full play to the removal effect of biological flocculation adsorption to particulate state and colloidal material, reach at short notice and to realize removing the purpose that mainly contains organic pollutants and total phosphorus, total nitrogen, and sludge yield is few, and running cost and investment cost are all lower.
Inner biotic district utilizes top spacer to seal, and forms the anaerobic zone in the treating processes, the open setting in outside biotic district, and a large amount of aeration, and when flowing out outward, along with the increase of dissolved oxygen content, the experience anoxic has arrived oxygen condition to waste water by interior.
Handle and biological treatment by two-stage coagulation, PVC acidic and alkaline waste water index changes as follows:
PVC acidic and alkaline waste water before handling: COD 600mg/L; BOD
5200mg/L; SS 200mg/L; Total hardness 3000mg/L; Total alkalinity 750mg/L; Colourity 30;
PVC acidic and alkaline waste water after the processing: COD 60mg/L; BOD
510mg/L; SS 200mg/L; Total hardness 450mg/L; Total alkalinity 350mg/L; Colourity 15.
Embodiment 2
Adding mass percent concentration in the dyeing waste water in certain printing and dyeing enterprise and be 4% liming alkali lye, to regulate the pH value scope of waste water be 8-9, and add 0.6% coagulating agent FeSO
4With 0.03% coagulant aids PAM;
Carry out second stage coagulating treatment then: add mass percent concentration once more and be 6% liming alkali lye and regulate waste water ph to 10-11, and add 0.4% coagulating agent PAC and 0.02% coagulant aids HCA (positively charged ion coagulant aids), the organic monomer that is difficult to remove under low pH is separated out from waste water.
Wherein coagulating agent, coagulant aids all are to be benchmark with pending PVC acidic and alkaline waste water total mass, add by mass percentage.
Dyeing waste water enters annular biological treatment tank through coagulating treatment and carries out the biological synergetic processing, at first enters inner biotic district, utilizes active sludge to carry out first step biological treatment, and its work period is 3 hours; Enter the outside biotic district of the annular that is in periphery, inner biotic district after the processing, utilize swimming biofilm packing and active sludge to carry out second stage biological treatment, its work period is 5 hours (water inlet, aerations 2.5 hours, solid-liquid separation 2 hours, precipitate 0.5 hour), enter settling section in the outside biotic district at last, under the honeycomb inclined-tube effect, carry out solid-liquid separation, the back up to standard after testing discharging of waste water after isolated liquid phase is promptly handled, isolated solid phase sludge is partly refluxed to the recycling of first step biological treatment stage.
Handle and biological treatment by two-stage coagulation, the waste water index changes as follows:
Waste water before handling: COD 100mg/L; BOD525mg/L; SS 70mg/L; PH 6～9; Colourity 40;
Waste water after the processing: COD 25mg/L; BOD510mg/L; SS 8mg/L; PH 6.5～8.5; Colourity 15.
Claims (7)
1. PVC acidic and alkaline waste water two-stage coagulation and biological synergetic treatment process is characterized in that, comprise the steps:
(1) two-stage coagulation is handled:
First step coagulating treatment:
The pH value of regulating pending PVC acidic and alkaline waste water is to 8.5-9.5, adds 0.3%～1.2% coagulating agent and 0.01%～0.03% coagulant aids;
Second stage coagulating treatment: regulate PVC acidic and alkaline waste water pH value after the first step coagulating treatment to 9.5-10.5, add 0.3%～0.6% coagulating agent and 0.01%～0.03% coagulant aids;
Wherein said coagulating agent, coagulant aids all are to be benchmark with pending PVC acidic and alkaline waste water total mass, add by mass percentage;
(2) biological treatment:
To carry out first step biological treatment and second stage biological treatment through the PVC acidic and alkaline waste water that two-stage coagulation is handled successively; Carry out the PVC acidic and alkaline waste water discharging after solid-liquid separation will be handled then,
Wherein, in described first step coagulating treatment and the second stage coagulating treatment, coagulating agent is FeSO4;
In the first step coagulating treatment, coagulant aids is PAM;
In the coagulating treatment of the second stage, coagulant aids is HCA or PAM.
2. PVC acidic and alkaline waste water two-stage coagulation as claimed in claim 1 and biological synergetic treatment process, it is characterized in that, described first step biological treatment is to utilize active sludge that waste water is handled, and the biological treatment of the described second stage is to utilize swimming biofilm packing and active sludge that waste water is handled.
3. PVC acidic and alkaline waste water two-stage coagulation as claimed in claim 2 and biological synergetic treatment process is characterized in that, carry out aeration during the biological treatment of the described second stage.
4. PVC acidic and alkaline waste water two-stage coagulation as claimed in claim 3 and biological synergetic treatment process is characterized in that, the first step biological treatment work period is 3 hours; The second stage biological treatment work period is 5 hours.
5. PVC acidic and alkaline waste water two-stage coagulation as claimed in claim 4 and biological synergetic treatment process is characterized in that, filter after first step coagulating treatment is finished, and filtrate enters second stage coagulating treatment then; Filter after second stage coagulating treatment is finished, filtrate enters biological treatment then.
6. PVC acidic and alkaline waste water two-stage coagulation as claimed in claim 5 and biological synergetic treatment process, it is characterized in that, adopt biological treatment tank in the described biological treatment process, this biological treatment tank is by the annular internal partition wall and be in the outer partition wall of its peripheral annular and surround, wherein internal partition wall institute area surrounded is inner biotic district, and the zone between outer partition wall and the internal partition wall is the outside biotic district of annular;
Load active sludge in the inner biotic district, be used for described first step biological treatment, load swimming biofilm packing and active sludge in the outside biotic district, be used for the biological treatment of the described second stage, the bottom in the outside biotic district is provided with aerated conduit;
Externally mark off the subregion in the biotic district as settling section, be used to carry out described solid-liquid separation, be provided with the honeycomb inclined-tube filler in the settling section.
7. PVC acidic and alkaline waste water two-stage coagulation as claimed in claim 6 and biological synergetic treatment process, it is characterized in that, after carrying out described solid-liquid separation, the PVC acidic and alkaline waste water after obtaining mud and handling is back to first step biological treatment stage to major general's part mud and reuses.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010533707 CN102464425B (en) | 2010-11-05 | 2010-11-05 | Two-stage coagulation and biological co-processing technology of PVC acid-alkali wastewater |
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| CN 201010533707 CN102464425B (en) | 2010-11-05 | 2010-11-05 | Two-stage coagulation and biological co-processing technology of PVC acid-alkali wastewater |
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| CN102464425B true CN102464425B (en) | 2013-07-24 |
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| CN103274569B (en) * | 2013-06-05 | 2014-06-11 | 内蒙古乌海化工股份有限公司 | Novel polyvinyl chloride (PVC) mother solution treatment equipment and method |
| CN103524000B (en) * | 2013-10-27 | 2015-06-10 | 新疆中泰化学股份有限公司 | Advanced treatment recycling method of polyvinyl chloride centrifuge mother liquor wastewater |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1417143A (en) * | 2001-11-09 | 2003-05-14 | 中国石油天然气股份有限公司 | ABS sewage treating method |
| CN101327996A (en) * | 2007-06-22 | 2008-12-24 | 宝山钢铁股份有限公司 | Treating process of dilute emulsified oily watewater |
| CN101560038A (en) * | 2009-05-19 | 2009-10-21 | 上海理工大学 | Method and device for treating sewage through synergistic action of activated sludge and biomembrane |
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- 2010-11-05 CN CN 201010533707 patent/CN102464425B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1417143A (en) * | 2001-11-09 | 2003-05-14 | 中国石油天然气股份有限公司 | ABS sewage treating method |
| CN101327996A (en) * | 2007-06-22 | 2008-12-24 | 宝山钢铁股份有限公司 | Treating process of dilute emulsified oily watewater |
| CN101560038A (en) * | 2009-05-19 | 2009-10-21 | 上海理工大学 | Method and device for treating sewage through synergistic action of activated sludge and biomembrane |
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