CN105836961A - Method for treating high concentration formaldehyde waste water - Google Patents
Method for treating high concentration formaldehyde waste water Download PDFInfo
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- CN105836961A CN105836961A CN201510781430.6A CN201510781430A CN105836961A CN 105836961 A CN105836961 A CN 105836961A CN 201510781430 A CN201510781430 A CN 201510781430A CN 105836961 A CN105836961 A CN 105836961A
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Abstract
The invention discloses a method for treating high concentration formaldehyde waste water. The method comprises pretreatment on waste water and microbial anaerobic and aerobic treatment. Through a reasonable design of the high concentration formaldehyde waste water treatment method, the whole method achieves a low cost and good effects and aims at high concentration waste water pretreatment so that high concentration formaldehyde-caused damage to organisms is prevented.
Description
Technical field
The application relates to a kind of method of wastewater treatment, particularly to a kind of method processing high-concentration formaldehyde wastewater, belongs to environmental technology field.
Background technology
Formaldehyde be a kind of colourless, have the gas of intense stimulus type abnormal smells from the patient.Soluble in water, alcohol and ether.35～40% formalin be called formalin.Formaldehyde is a kind of important Organic Ingredients, is mainly used in plastics industry, synthetic fibers, leather industry, medicine, dyestuff and wood adhesive production process etc..Therefore, in the synthesis technique with formaldehyde as raw material, inevitable containing a certain amount of formaldehyde in waste water.
And the kilometer technique of formaldehyde waste water is generally divided into physico-chemical process and bioanalysis, wherein physico-chemical process includes Fenton method, photocatalytic oxidation, wet oxidation process, chlorine oxidation process, electrochemical process etc., but in actual industrial production, the above-mentioned several physico-chemical process of simple employing process formaldehyde waste water, and its processing cost is higher.Comparatively speaking, Biochemical method formaldehyde waste water cost is relatively low, but this technology the most not very maturation, therefore, need a kind of mature and stable, formaldehyde-containing effluent treating process of cost savings badly, especially for high-concentration formaldehyde wastewater.
Summary of the invention
It is an object of the invention to provide a kind of method processing high-concentration formaldehyde wastewater, with the disposal methods high-concentration formaldehyde wastewater of the present invention, there is the advantages such as low cost, high efficiency, shock resistance, system stability.
The above-mentioned purpose of the present invention is achieved through the following technical solutions:
Thering is provided a kind of method processing high-concentration formaldehyde wastewater, it comprises the steps of:
A described high-concentration formaldehyde wastewater is sent into collecting-tank and is entered pretreatment pool after regulating water quality, the water yield by (), filtered by iron filings layer wherein and carry out pretreatment.Wherein, arranging iron filings layer in pretreatment pool so that dissolve substantial amounts of ferrous ion in waste water, in order in follow-up anaerobic pond, ferrous ion can be with S produced by anaerobic reaction2-reaction generates precipitation, to eliminate S2-impact on microorganism, it is ensured that being smoothed out of anaerobic reaction.
B waste water in step (a) is passed through distribution reservoir by (), in distribution reservoir, the mixture of sodium hydroxide and calcium hydroxide is added by distribution reservoir medicament add-on system, making its pH value be adjusted to 6.5-7.5, in wherein said mixture, the mol ratio of sodium hydroxide and calcium hydroxide is 1:2-2:1.Medicament is the mixture of sodium hydroxide and calcium hydroxide, wherein sodium hydroxide act as regulate pH, and the acting as it and react generation formose with oxymethylene polymerization of calcium hydroxide, and formose is easier to biological decomposition, and control both ratios, in the range of further the mass concentration of control calcium hydroxide and formaldehyde is 0.05-0.5, and control temperature best results in 50-100 DEG C.It addition, for ensureing that in distribution reservoir, substance reaction is abundant, can arrange blender in distribution reservoir, preferably anchor formula stirring paddle, rotating speed controls at 50-100r/min, secondly, PH detection device can be set in distribution reservoir and monitor the pH change of distribution reservoir at any time, in order to control the input of medicament.
C waste water in step (b) is passed through anaerobic pond and carries out anaerobic treatment by ().
D waste water in step (c) is passed through in Aerobic Pond and carries out Aerobic Process for Treatment by ().
E waste water in step (d) is passed through second pond and carries out precipitation process by (), and make the sludge reflux in second pond to distribution reservoir, anaerobic pond and Aerobic Pond, and wherein return sludge ratio controls at 0.2-1.5.Sludge reflux is relatively conventional in this area, but is all by the sludge reflux in second pond to anaerobic pond in prior art or/and Aerobic Pond, and in the present invention creative by the sludge reflux in second pond to distribution reservoir.
F waste water in step (e) is passed through reaction tank by (), add ferrous sulfate by the medicament add-on system of reaction tank, and be passed through chlorine in reaction tank.Find by the supernatant in second pond is detected, it can not meet emission request not yet, and be to realize the emission request in accordance with national regulation further, the invention devise secondary precipitation process herein, and through substantial amounts of research, we find that using ferrous sulfate is coagulant in common ferric flocculant, and it is aided with chlorine as flocculation aid effect far better than other kinds of ferrum system or Al-based coagulant.
G waste water in step (f) is passed through sedimentation tank by (), wherein the sludge settling in sedimentation tank and anaerobic pond is pooled to sludge-tank further so that mud is carried out following process process, and the supernatant in sedimentation tank is then passed through clear water reserviors；
Wherein, the waste water content of formaldehyde being passed through in step (a) be 10000-20000mg/L, pH be 5-6, COD content be 1000-5000100mg/L；And the content of formaldehyde in clear water reserviors is 6-9 less than 1mg/L, pH in step (g), COD content is less than or equal to 100mg/L.
Wherein, also needing to add nutritive salt in step (b) in distribution reservoir, described nutritive salt is the mixture of carbamide and sodium dihydrogen phosphate, and wherein carbamide addition is 20-40mg/L, and the addition of sodium dihydrogen phosphate is 4-8ml/L.Through the interpolation of above-mentioned nutritive salt, so that C:N:P=100:5-10:1-2 in waste water.
Wherein, described distribution reservoir is equipped with steam-heating system, and the temperature controlling distribution reservoir is 70-100 DEG C.
Wherein, having combination biologic packing material in Aerobic Pond, described biologic packing material includes the big plastic hoop of double-round, and its outer ring is hydroformylation fiber, and inner ring is flakes plastics.Outer ring fibre bundle is uniformly distributed, and inner ring is except biofilm, moreover it is possible to cutting bubble, significantly improves transfer rate and the utilization rate of oxygen so that the Organic substance in water obtains processing more efficiently.
Wherein, the sludge reflux controlling second pond enters anaerobic pond, to keep the pH of anaerobic pond to control at 5.5-7.5.
Wherein, the subsequent treatment in step (g) is pressure filter filter pressing, and makes the supernatant of sludge-tank and the pressing filtering liquid of pressure filter be back in collecting-tank after mixing.
Wherein, also including step (h) after step (g), described step (h) is to use bi-membrane method to process further the waste water in clear water reserviors.
Wherein, described double films are the micro-filtration membrane and reverse osmosis membrane being sequentially connected with.The bi-membrane method using micro-filtration membrane and reverse osmosis membrane filters, and can separate waste water and desalination, and water quality is further enhanced, it is possible to achieve waste water recycling, and real realizes zero-emission.
Wherein, by the effluent recycling in part Aerobic Pond to distribution reservoir, to reduce the process load of anaerobic system.
Beneficial effects of the present invention:
The present invention by processing the appropriate design of technique to high-concentration formaldehyde wastewater, whole technique is made to have the advantages that low cost, effect are good, pretreatment especially for high-concentration waste water, the high concentration making formaldehyde is difficult to destroy the processing procedure of bioanalysis PARA FORMALDEHYDE PRILLS(91,95), and the effluent quality processed through this method reaches " integrated wastewater discharge standard " (GB8978-1996) first discharge standard..Concrete, (1) arranges iron filings layer in pretreatment pool, and ferrous ion can generate precipitation, to eliminate the S2-impact on microorganism, it is ensured that being smoothed out of anaerobic reaction with S2-reaction produced by anaerobic reaction.(2) by the appropriate design to sludge reflux so that system reaches optimum state.(3) by arranging reaction tank and sedimentation tank in second pond, it is ensured that the treatment effect of waste water, emission request is met.(4) by arranging bi-membrane method filtration after clear water reserviors so that water quality is further enhanced, it is possible to achieve waste water recycling, and real realizes zero-emission.
Accompanying drawing explanation
The present invention is further described in conjunction with the accompanying drawings and embodiments:
Fig. 1 is schematic appearance of the present invention
Fig. 2 is top view of the present invention
Detailed description of the invention
Embodiment 1:
The present embodiment uses the high-concentration formaldehyde wastewater in certain chemical plant to test as waste water sample, and before and after process, each component content of waste water sample is as shown in table 1,2.
Table 1 processes front effluent quality index
Effluent quality index after table 2 process
| pH | CODCr | BOD5 | SS | Formaldehyde |
| 6～9 | ≤100mg/L | ≤20mg/L | ≤70mg/L | ≤1.0mg/L |
The present embodiment step is as follows:
A formaldehyde waste water is sent into collecting-tank and is entered pretreatment pool after regulating water quality, the water yield by (), filtered by iron filings layer wherein and carry out pretreatment.Wherein, arranging iron filings layer in pretreatment pool so that dissolve substantial amounts of ferrous ion in waste water, in order in follow-up anaerobic pond, ferrous ion can be with S produced by anaerobic reaction2-Reaction generates precipitation, to eliminate S2-Impact on microorganism, it is ensured that being smoothed out of anaerobic reaction.
nullB waste water in step (a) is passed through distribution reservoir by ()，In distribution reservoir, the mixture of sodium hydroxide and calcium hydroxide is added by distribution reservoir medicament add-on system，Its pH value is made to be adjusted to about 7.0，In wherein said mixture, the mol ratio of sodium hydroxide and calcium hydroxide is 1:2，In the range of further the mass concentration of control calcium hydroxide and formaldehyde is 0.05-0.5，And steam-heating system is set outside distribution reservoir，With strict temperature control at 92 DEG C，Wherein，For ensureing that in distribution reservoir, substance reaction is abundant，Anchor agitator can be set in distribution reservoir，Rotating speed controls at 50-100r/min，And arrange in distribution reservoir PH detection device monitor at any time distribution reservoir pH change，To control the input of medicament，Need to add nutritive salt in distribution reservoir simultaneously，Nutritive salt is the mixture of carbamide and sodium dihydrogen phosphate，Wherein carbamide addition is 20-40mg/L，The addition of sodium dihydrogen phosphate is 4-8ml/L.
C waste water in step (b) is passed through anaerobic pond and carries out anaerobic treatment by (), to reduce the COD content in waste water, the pollutant in clear liquid are decomposed into sulphion the S with the generation in step (a) by microbiological anaerobic2-reaction generates precipitation, to eliminate S2-impact on microorganism, it is ensured that being smoothed out of anaerobic reaction, and mud is transported in follow-up sludge-tank.
D waste water in step (c) is passed through in Aerobic Pond and carries out Aerobic Process for Treatment by (), obtain supernatant in the organic wastewater containing aerobic strain after hybrid reaction, and by the effluent recycling in part Aerobic Pond to distribution reservoir.Having combination biologic packing material in Aerobic Pond, it includes the big plastic hoop of double-round, and its outer ring is hydroformylation fiber, and inner ring is flakes plastics.
E waste water in step (d) is passed through second pond and carries out precipitation process by (), and make the sludge reflux in second pond to distribution reservoir, anaerobic pond and Aerobic Pond, wherein return sludge ratio controls about 1, and control the sludge reflux of backflow to the flow-rate ratio in distribution reservoir, anaerobic pond, Aerobic Pond, so that the pH of anaerobic pond controls at 5.5-7.5.
F waste water in step (e) is passed through reaction tank by (), add ferrous sulfate by the medicament add-on system of reaction tank, and be passed through chlorine in reaction tank.
G waste water in step (f) is passed through sedimentation tank by (), wherein the sludge settling in sedimentation tank and anaerobic pond is pooled to sludge-tank further so that mud to carry out pressure filter filter pressing process, and be back in collecting-tank after making the supernatant of sludge-tank and the pressing filtering liquid mixing of pressure filter, the supernatant in sedimentation tank is then passed through clear water reserviors.
Embodiment 2
Step (a)-(g) participates in embodiment 1, as different from Example 1, for realizing the treatment effect of waste water further, bi-membrane method can be used to process the waste water in clear water reserviors, it is the micro-filtration membrane and reverse osmosis membrane being sequentially connected with, wherein micro-filtration membrane is multichannel ceramic membrane, and aperture is 0.5 microns, and reverse osmosis membrane uses polyamide membrane.
The foregoing is only highly preferred embodiment of the present invention, be not limited to the present invention.Any modification, equivalent substitution and improvement etc. done within all principles in the present invention and spirit, should be included in protection scope of the present invention.
Claims (9)
1. the method processing high-concentration formaldehyde wastewater, it comprises the steps of:
A described high-concentration formaldehyde wastewater is sent into collecting-tank and is entered after regulating water quality, the water yield by ()
Pretreatment pool, is filtered by iron filings layer wherein and carries out pretreatment；
B waste water in step (a) is passed through distribution reservoir by (), by distribution reservoir medicament add-on system to
Distribution reservoir adds sodium hydroxide and the mixture of calcium hydroxide so that it is pH value is adjusted to 6.5-7.5, its
Described in mixture the mol ratio of sodium hydroxide and calcium hydroxide be 1:2-2:1；
C waste water in step (b) is passed through anaerobic pond and carries out anaerobic treatment by ()；
D waste water in step (c) is passed through in Aerobic Pond and carries out Aerobic Process for Treatment by ()；
E waste water in step (d) is passed through second pond and carries out precipitation process by (), and make in second pond
Sludge reflux to distribution reservoir, anaerobic pond and Aerobic Pond, wherein return sludge ratio controls at 0.2-1.5；
F waste water in step (e) is passed through reaction tank by (), by the medicament add-on system of reaction tank
In reaction tank, add ferrous sulfate, and be passed through chlorine；
G waste water in step (f) is passed through sedimentation tank by (), wherein the mud in sedimentation tank and anaerobic pond
Precipitation is pooled to sludge-tank further so that mud to carry out following process process, and the supernatant in sedimentation tank
Liquid is then passed through clear water reserviors；
Wherein, the waste water content of formaldehyde being passed through in step (a) is that 10000-20000mg/L, pH are
5-6, COD content is 1000-5000100mg/L；And the content of formaldehyde in clear water reserviors in step (g)
It is that 6-9, COD content is less than or equal to 100mg/L less than 1mg/L, pH.
The method of process high-concentration formaldehyde wastewater the most according to claim 1, it is characterised in that
Also needing to add nutritive salt in step (b) in distribution reservoir, described nutritive salt is carbamide and biphosphate
The mixture of sodium, wherein carbamide addition is 20-40mg/L, and the addition of sodium dihydrogen phosphate is
4-8ml/L。
The method of process high-concentration formaldehyde wastewater the most according to claim 1, it is characterised in that institute
The distribution reservoir stated is equipped with steam-heating system, and the temperature controlling distribution reservoir is 70-100 DEG C.
The method of process high-concentration formaldehyde wastewater the most according to claim 1, it is characterised in that good
Having combination biologic packing material in oxygen pond, described biologic packing material includes the big plastic hoop of double-round, and its outer ring is
Hydroformylation fiber, inner ring is flakes plastics.
The method of process high-concentration formaldehyde wastewater the most according to claim 1, it is characterised in that control
The sludge reflux of second pond processed enters anaerobic pond, to keep the pH of anaerobic pond to control at 5.5-7.5.
The method of process high-concentration formaldehyde wastewater the most according to claim 1, it is characterised in that step
Suddenly the subsequent treatment in (g) is pressure filter filter pressing, and makes the supernatant of sludge-tank and the filter pressing of pressure filter
It is back in collecting-tank after liquid mixing.
The method of process high-concentration formaldehyde wastewater the most according to claim 1, it is characterised in that no
Also including step (h) after step (g), described step (h) is that the waste water in clear water reserviors is entered one
Step uses bi-membrane method to process.
The method of process high-concentration formaldehyde wastewater the most according to claim 7, it is characterised in that institute
The double films stated are the micro-filtration membrane and reverse osmosis membrane being sequentially connected with.
9. the method processing high-concentration formaldehyde wastewater described in claim 1, it is characterised in that by part
Effluent recycling in Aerobic Pond is to distribution reservoir, to reduce the process load of anaerobic system.
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| CN201510781430.6A CN105836961A (en) | 2015-11-13 | 2015-11-13 | Method for treating high concentration formaldehyde waste water |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106830260A (en) * | 2017-03-09 | 2017-06-13 | 桂林融通科技有限公司 | One kind removal formaldehyde in waste water inorganic agent |
| CN107140793A (en) * | 2017-07-07 | 2017-09-08 | 贵州翌龙项目工程咨询有限公司 | A kind of method and its integration apparatus for handling formaldehyde waste water |
| CN109928582A (en) * | 2019-04-18 | 2019-06-25 | 南京清元景和环境科技有限公司 | Biological, the chemically composited processing method of formaldehyde-containing wastewater |
| CN112456716A (en) * | 2020-12-06 | 2021-03-09 | 江苏金碧源环保科技有限公司 | Pretreatment method of formaldehyde wastewater |
| CN117247143A (en) * | 2023-09-27 | 2023-12-19 | 江苏蓝淏环保科技有限公司 | Treatment method of polyoxymethylene wastewater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106830260A (en) * | 2017-03-09 | 2017-06-13 | 桂林融通科技有限公司 | One kind removal formaldehyde in waste water inorganic agent |
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| CN117247143A (en) * | 2023-09-27 | 2023-12-19 | 江苏蓝淏环保科技有限公司 | Treatment method of polyoxymethylene wastewater |
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Application publication date: 20160810 |