CN108328789A - A kind of synchronous method for removing sulfate and ammonia nitrogen in smelting wastewater - Google Patents
A kind of synchronous method for removing sulfate and ammonia nitrogen in smelting wastewater Download PDFInfo
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- CN108328789A CN108328789A CN201810088240.XA CN201810088240A CN108328789A CN 108328789 A CN108328789 A CN 108328789A CN 201810088240 A CN201810088240 A CN 201810088240A CN 108328789 A CN108328789 A CN 108328789A
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- ammonia nitrogen
- sulfate
- smelting wastewater
- removal
- filtrate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F7/00—Aeration of stretches of water
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
Abstract
A kind of synchronous method for removing sulfate and ammonia nitrogen in smelting wastewater, the present invention relates to the methods of sulfate and ammonia nitrogen in removal smelting wastewater.The present invention is to solve the smelting wastewater intractability of existing containing sulfate, ammonia nitrogen and metal ion is big, the high technical problem of operating cost.This method：After smelting wastewater is pre-processed twice with sodium hydroxide solution, adds calcium hydroxide and carry out chemical precipitation, most remove the ammonia nitrogen in waste water through stripping afterwards, realize the synchronous removal of sulfate, ammonia nitrogen, metal ion.After smelting wastewater has the method processing of the present invention, the removal rate of sulfate is up to 99.99%, and the removal rate of ammonia nitrogen is up to 99.52%, and the removal rates of total dissolved solidss is up to 98.23%.The investment of this method is small, operating cost is low, can be used for wastewater treatment and recycles.
Description
Technical field
The present invention relates to the methods of sulfate and ammonia nitrogen in removal smelting wastewater, belong to field of industrial waste water treatment.
Background technology
Water is indispensable resource in human survival, production activity, with the growth, expanding economy and people of population
People's improvement of living standard, the mankind are increasing to the demand of water resource.But water resource is a kind of limited irreplaceable
Precious resources.In China, shortage of water resources has become a common problem, and the pollution of water resource makes this problem more
Add serious.The waste water of containing sulfate and ammonia nitrogen is will produce in metal wet smelting process, simultaneously because the complicated component of ore, leads
It causes to contain other metal ions, such as sodium, magnesium, calcium, zinc, manganese in containing sulfate and ammonia nitrogen waste water simultaneously.Waste water is in acidity, wherein
Pollutant exist in the form of an ion, if direct emission water body can cause the serious pollution of water body.
Complex compound is generated since the ammonia nitrogen of smelting wastewater can be reacted with metal ion, while zinc hydroxide is both sexes hydrogen-oxygen
Compound can be dissolved in acid or be dissolved in alkali, increase the intractability of smelting wastewater.The common processing method of high-salt wastewater
Including ion exchange, reverse osmosis, electrodialysis etc., that there are equipment investments when these methods handle the sulfate in smelting wastewater is big,
The problem that operating cost is high, maintenance cost is high.The processing method of existing high-salt wastewater also has evaporative crystallization method, this processing side
The operating cost of method is also high.The conventional treatment method of high ammonia-nitrogen wastewater has blow-off method, zeolite deamination method, break point chlorination method etc.,
These methods are only capable of the ammonia nitrogen in removal waste water, then invalid for the ammonia of complexing, and the operating cost of latter two method is high.
Invention content
The present invention is to solve the smelting wastewater intractability of existing containing sulfate, ammonia nitrogen and metal ion is big, fortune
The costly technical problem of row, and a kind of synchronous method for removing sulfate and ammonia nitrogen in smelting wastewater is provided.
The method of sulfate and ammonia nitrogen, carries out according to the following steps in the synchronous removal smelting wastewater of the present invention：
One, 1 is pre-processed：Sodium hydroxide solution is added into smelting wastewater so that the pH of waste water reaches 9~10, there is hydrogen-oxygen
Compound precipitation generates, and hydroxide is precipitated and removed, obtains filtrate by filtering；
Two, 2 are pre-processed：Sodium hydroxide solution is continuously added in the filtrate obtained to step 1 so that the pH of filtrate is 12
~13, there is hydroxide precipitation to generate, stand, the hydroxide of lower layer is precipitated into removal, obtains supernatant；
Three, chemical precipitation：Solid calcium hydroxide is added in the supernatant obtained to step 2 so that hydroxide in supernatant
A concentration of 29.5~30.5g/L of calcium has calcium sulfate precipitation generation, and calcium sulfate precipitation is removed, obtains filtrate by filtering；
Four, stripping is handled：20~25min is aerated in the filtrate obtained to step 3, the place of smelting wastewater is completed in water outlet
Reason.
The present invention and the smelting wastewater processing method of existing containing sulfate, ammonia nitrogen and metal ion are compared, and are had as follows
Advantage：
1) the synchronous removal of sulfate, ammonia nitrogen, metal ion can be realized：The present invention is molten by adding sodium hydroxide first
Liquid makes the metal ion in waste water generate hydroxide precipitation removal, and the removal of metal ion also dissociates the ammonia nitrogen of complexing
Come, good basis is laid for the removal of follow-up ammonia nitrogen；Then calcium hydroxide is added, it is made to generate sulfuric acid with the sulfate in waste water
Calcium precipitate, and filtration treatment precipitates；The ammonia nitrogen in blow-off method removal waste water is finally used, realizes sulfate, ammonia nitrogen, metal ion
Synchronous removal.After smelting wastewater is using the method processing of the present invention, the removal rate of sulfate is up to 99.99%, the removal of ammonia nitrogen
Rate is up to 99.52%, and the removal rates of total dissolved solidss (TDS) is up to 98.23%.
2) operating cost is low：Present invention employs pretreatment+chemical precipitation+blow-off methods to handle smelting wastewater, medicament expense
It is low, it is only necessary to add a small amount of sodium hydroxide and calcium hydroxide.Low energy consumption, and two-step method and chemical precipitation step are stirred
It mixes and the operation of the stripping of stripping processing step is low energy consumption operation.
3) it invests small：Present invention employs pretreatment+chemical precipitation+blow-off methods to handle smelting wastewater, and technological process is simple,
Hydraulic detention time is short, and auxiliary device is few, and floor space is small, therefore investment is substantially reduced.
4) using water wisely：After smelting wastewater is processed by the invention, sulfate, ammonia nitrogen and metal ion in water outlet etc.
Concentration significantly reduces, and water outlet disclosure satisfy that reuse requirement, realize recycling for waste water.
The smelting wastewater intractability that the present invention efficiently solves containing sulfate, ammonia nitrogen and metal ion is big, running cost
With height, the big problem of equipment investment realizes the efficient removal of sulfate, ammonia nitrogen, metal ion, the cycle profit of primary wastewater
With being conducive to promote and apply.
Description of the drawings
Fig. 1 is the removal effect figure for testing the progress sulfate in 1 with processing；
Fig. 2 is the removal effect figure for testing the progress ammonia nitrogen in 1 with processing；
Fig. 3 is the removal effect figure for testing the carry out total dissolved solidss in 1 with processing.
Specific implementation mode
Specific implementation mode one：The method of sulfate and ammonia nitrogen in the synchronous removal smelting wastewater of present embodiment, by with
Lower step carries out：
One, 1 is pre-processed：Sodium hydroxide solution is added into smelting wastewater so that the pH of waste water reaches 9~10, there is hydrogen-oxygen
Compound precipitation generates, and hydroxide is precipitated and removed, obtains filtrate by filtering；
Two, 2 are pre-processed：Sodium hydroxide solution is continuously added in the filtrate obtained to step 1 so that the pH of filtrate is 12
~13, there is hydroxide precipitation to generate, stand, the hydroxide of lower layer is precipitated into removal, obtains supernatant；
Three, chemical precipitation：Solid calcium hydroxide is added in the supernatant obtained to step 2 so that hydroxide in supernatant
A concentration of 29.5~30.5g/L of calcium has calcium sulfate precipitation generation, and calcium sulfate precipitation is removed, obtains filtrate by filtering；
Four, stripping is handled：20~25min is aerated in the filtrate obtained to step 3, the place of smelting wastewater is completed in water outlet
Reason.
Specific implementation mode two：The present embodiment is different from the first embodiment in that sodium hydroxide solution in step 1
Mass percentage concentration be 10~12%；It is other same as the specific embodiment one.
Specific implementation mode three：The present embodiment is different from the first and the second embodiment in that in step 1 waste water pH
Reach 9.5；It is other the same as one or two specific embodiments.
Specific implementation mode four：Hydrogen-oxygen in step 2 unlike one of present embodiment and specific implementation mode one to three
The mass percentage concentration for changing sodium solution is 10~13%；It is other identical as one of specific implementation mode one to three.
Specific implementation mode five：Filtrate in step 2 unlike one of present embodiment and specific implementation mode one to four
PH be 12.5；It is other identical as one of specific implementation mode one to four.
Specific implementation mode six：Supernatant in step 3 unlike one of present embodiment and specific implementation mode one to five
A concentration of 29g/L of calcium hydroxide in liquid；It is other identical as one of specific implementation mode one to five.
With following verification experimental verification beneficial effects of the present invention：
Experiment 1：The method of sulfate and ammonia nitrogen, carries out according to the following steps in the synchronous removal smelting wastewater of this experiment：
One, 1 is pre-processed：Take the smelting wastewater generated in metal wet smelting process, the pollutant of the smelting wastewater and its
A concentration of sulfuric acid with a concentration of 59106.00mg/L, a concentration of 10934.43mg/L of ammonia nitrogen, total dissolved solidss (TDS)
A concentration of 68282.96mg/L；It takes 600mL smelting wastewaters to be added in the beaker of 1000mL, is then added again into beaker a concentration of
10% sodium hydroxide solution, and stir, while the pH value of smelting wastewater in beaker is detected, pH stops adding after being increased to 9.5
Sodium hydroxide solution has hydroxide precipitation to generate, after the hydroxide in smelting wastewater is filtered with filter paper, obtains filtrate；
Detect sulfate radical, ammonia nitrogen and the total dissolved solids in filtrate；
Two, 2 are pre-processed：A concentration of 10% sodium hydroxide solution is continuously added in the filtrate obtained to step 1, and is stirred
It mixes, while detecting the pH value of filtrate, pH stops adding sodium hydroxide solution after being increased to 12, has hydroxide precipitation to generate, quiet
.5h is set to 0, the hydroxide of lower layer is precipitated into removal, obtains supernatant；Detect sulfate radical, ammonia nitrogen and the total dissolving in supernatant
Amount of solid；
Three, chemical precipitation：Solid calcium hydroxide is added in the supernatant obtained to step 2 so that hydroxide in supernatant
A concentration of 29.848g/L of calcium has calcium sulfate precipitation generation, and calcium sulfate precipitation is removed, obtains filtrate by filtering；Detect filtrate
In sulfate radical, ammonia nitrogen and total dissolved solids；
Four, stripping is handled：It is aerated 20min in the filtrate obtained to step 3, is discharged, completes the processing of smelting wastewater；Inspection
Measure sulfate radical, ammonia nitrogen and the total dissolved solids in water.
Sulfate radical content and removal rate in this experiment 1 in each step is as shown in Figure 1, it will be seen from figure 1 that with pre- place
Reason 1, the progress for pre-processing 2, chemical precipitation, the concentration of sulfate radical constantly reduces, after chemical precipitation step, sulfate concentration
5.77mg/L is fallen below from 60000mg/L, the removal rate of sulfate ensure that the removal rate of the sulfate radical of water outlet up to 99.99%.
Ammonia nitrogen and removal rate in this experiment 1 in each step are as shown in Fig. 2, figure it is seen that with pretreatment 1, pre-
The progress of 2, chemical precipitation is handled, the concentration of ammonia nitrogen has reduction trend, but before chemical precipitation processing, the removal effect of ammonia nitrogen is not
Greatly, the removal of ammonia nitrogen is mainly by stripping processing step, and after stripping is handled, the concentration of ammonia nitrogen is fallen below from 10000mg/L
The removal rate of 52.11mg/L, ammonia nitrogen reach 99.52%.
Total dissolved solids and removal rate in this experiment 1 in each step is as shown in figure 3, from figure 3, it can be seen that with pre-
Processing 1, the progress for pre-processing 2, chemical precipitation, the content of total dissolved solidss (TDS) gradually declines, by chemical precipitation step
Afterwards, the removal rate of total dissolved solidss reaches 98.23%.
Experiment 2：The method of sulfate and ammonia nitrogen, carries out according to the following steps in the synchronous removal smelting wastewater of this experiment：
One, 1 is pre-processed：Take the smelting wastewater generated in metal wet smelting process, the pollutant of the smelting wastewater and its
A concentration of sulfuric acid with a concentration of 59106.00mg/L, a concentration of 10934.43mg/L of ammonia nitrogen, total dissolved solidss (TDS)
A concentration of 68282.96mg/L；It takes 600mL smelting wastewaters to be added in the beaker of 1000mL, is then added again into beaker a concentration of
12% sodium hydroxide solution, and stir, while the pH value of smelting wastewater in beaker is detected, pH stops adding hydrogen after being increased to 10
Sodium hydroxide solution has hydroxide precipitation to generate, after the hydroxide in smelting wastewater is filtered with filter paper, obtains filtrate；Inspection
Survey sulfate radical, ammonia nitrogen and the total dissolved solids in filtrate；
Two, 2 are pre-processed：A concentration of 12% sodium hydroxide solution is continuously added in the filtrate obtained to step 1, and is stirred
It mixing, while detecting the pH value of filtrate, pH stops adding sodium hydroxide solution after being increased to 12.5, has hydroxide precipitation to generate,
1h is stood, the hydroxide of lower layer is precipitated into removal, obtains supernatant；Detect sulfate radical, ammonia nitrogen and the total dissolving in supernatant
Amount of solid；
Three, chemical precipitation：Solid calcium hydroxide is added in the supernatant obtained to step 2 so that hydroxide in supernatant
A concentration of 30g/L of calcium has calcium sulfate precipitation generation, and calcium sulfate precipitation is removed, obtains filtrate by filtering；It detects in filtrate
Sulfate radical, ammonia nitrogen and total dissolved solids；
Four, stripping is handled：It is aerated 25min in the filtrate obtained to step 3, is discharged, completes the processing of smelting wastewater；Inspection
Measure sulfate radical, ammonia nitrogen and the total dissolved solids in water.
This experiment 2 is after the processing of two-step method, chemical precipitation and stripping, and the removal rate of sulfate reaches in water outlet
99.98%, the removal rate of ammonia nitrogen reaches 99.64%, and the removal rate of total dissolved solidss reaches 98.78%.
Claims (6)
1. it is a kind of it is synchronous removal smelting wastewater in sulfate and ammonia nitrogen method, it is characterised in that this method according to the following steps into
Row：
One, 1 is pre-processed：Sodium hydroxide solution is added into smelting wastewater so that the pH of waste water reaches 9~10, there is hydroxide
Precipitation generates, and hydroxide is precipitated and removed, obtains filtrate by filtering；
Two, 2 are pre-processed：Sodium hydroxide solution is continuously added in the filtrate obtained to step 1 so that the pH of filtrate is 12~13,
There is hydroxide precipitation to generate, stand, the hydroxide of lower layer is precipitated into removal, obtains supernatant；
Three, chemical precipitation：Solid calcium hydroxide is added in the supernatant obtained to step 2 so that calcium hydroxide in supernatant
A concentration of 29.5~30.5g/L has calcium sulfate precipitation generation, and calcium sulfate precipitation is removed, obtains filtrate by filtering；
Four, stripping is handled：20~25min is aerated in the filtrate obtained to step 3, the processing of smelting wastewater is completed in water outlet.
2. the method for sulfate and ammonia nitrogen in a kind of synchronous removal smelting wastewater according to claim 1, it is characterised in that
The mass percentage concentration of sodium hydroxide solution is 10%~12% in step 1.
3. the method for sulfate and ammonia nitrogen, feature exist in a kind of synchronous removal smelting wastewater according to claim 1 or 2
The pH of waste water reaches 9.5 in step 1.
4. the method for sulfate and ammonia nitrogen, feature exist in a kind of synchronous removal smelting wastewater according to claim 1 or 2
The mass percentage concentration of sodium hydroxide solution is 10%~13% in step 2.
5. the method for sulfate and ammonia nitrogen, feature exist in a kind of synchronous removal smelting wastewater according to claim 1 or 2
The pH of filtrate is 12.5 in step 2.
6. the method for sulfate and ammonia nitrogen, feature exist in a kind of synchronous removal smelting wastewater according to claim 1 or 2
In step 3 in supernatant calcium hydroxide a concentration of 30g/L.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110550780A (en) * | 2019-09-26 | 2019-12-10 | 成都信息工程大学 | Method for treating desulfurization wastewater of thermal power plant based on pretreatment and double-membrane method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20180727 |