CN105000713A - Desulfurization wastewater treatment system and desulfurization wastewater treatment method - Google Patents
Desulfurization wastewater treatment system and desulfurization wastewater treatment method Download PDFInfo
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- CN105000713A CN105000713A CN201510431419.7A CN201510431419A CN105000713A CN 105000713 A CN105000713 A CN 105000713A CN 201510431419 A CN201510431419 A CN 201510431419A CN 105000713 A CN105000713 A CN 105000713A
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Abstract
The present invention discloses a desulfurization wastewater treatment system and a desulfurization wastewater treatment method. The desulfurization wastewater treatment system comprises: a wastewater buffer pool, wherein the water inlet is connected with the outlet of an apparatus for producing desulfurization wastewater; a sludge pressing device, wherein the input end and the water outlet of the wastewater buffer pool are connected; a multi-stage treatment pool, wherein the water inlet is connected with the water outlet of the sludge pressing device; a clarification pool, wherein the water inlet is connected with the water outlet of the multi-stage treatment pool; and a pH value re-adjusting box, wherein the water inlet is connected with the clear water outlet on the upper portion of the clarification pool. The invention further provides a wastewater treatment method adopting the system. According to the present invention, the wastewater treatment method is particularly suitable for pellet flue gas wet desulphurization wastewater, the process is simple, the solid content in the system is low, the operating cost is reduced while the desulfurization by-product gypsum and the slow-release fertilizer can be recycled, and the final effluent meets the national discharge standard.
Description
Technical field
The present invention relates to field of waste water treatment, particularly relate to a kind of desulfurization wastewater treatment system and method, this system and method is particularly suitable for the waste water that pelletizing smoke-gas wet desulfurization produces.
Background technology
Find after deliberation, the discharge of sulfide is main relevant with coal-burning power plant and steel industry, and the application of pelletizing flue gas desulfurization technique is the Main Means that steel industry controls sulfide emission, is control sulfurous gas (SO
2) important channel of quantity discharged.At present, domestic large-scale steel mill increases sulfur removal technology mostly, carries out pelletizer desulfurization, reduces SO
2discharge.And Chinese large-sized iron and steel enterprise more and more payes attention to the research of pelletizing flue gas desulfurization technique, flue gas desulfurization has now become the indispensable important component part of pelletizing plant, proposes new requirement and standard thus to the development of China's iron and steel cause.
Current sulfur method generally has desulfurization after desulfurization and burning in desulfurization before burning, burning, and the flue gas desulfurization after burning is control SO at present
2the Main Means polluted.Wherein wet desulfurization of flue gas by limestone-gypsum method technique is in conjunction with prior art vortex impingement method desulfation dust-extraction device, and can integrate desulfurization except fine dust, desulfuration efficiency is greater than 95%, and mercury removal efficiency is greater than 80%.In smoke-gas wet desulfurization process, usual needs discharge a part of filtrate water as desulfurization wastewater, to maintain the balance of the chlorion of serum recycle system, fluorinion concentration and material, avoid desulphurization system absorb salinity in slurries and suspended impurity concentration more and more higher with the accumulation of working time, thus alleviate the corrosion to absorption tower system and structure.Wet flue gas desulfurization waste water is mainly derived from the knockout drum underflow (mainly gypsum dehydration and cleaning system) of gypsum rotational flow station and vacuum belt dewaterer, and the principal character of waste water is as follows:
(1) waste water presents slightly acidic, and pH value is 4.0 ~ 6.0;
(2) solid content is higher, 10000 ~ 12000mg/l, as gypsum particle, SiO
2, Al and Fe oxyhydroxide;
(3) ammonia-nitrogen content is high, 900 ~ 1700mg/l;
(4) the heavy metal kind of trace is complicated, as Hg, As, Cr, Cd etc., is much wherein require the strict first kind pollutent controlled in national environmental standard;
(5) inorganic salt content is higher, as vitriol, muriate etc.
Analyzed by waste water quality, in known waste water, the content of each material is all considerably beyond the outer emission standard of waste water, discharges after therefore needing to process waste water again.Pelletizing wastewater desulfurized by fume wet must consider removal efficiency and the degree of above pollutent simultaneously.
The traditional Waste Water Treatment in this field is see Fig. 1, desulfurization wastewater process many employings physicochemical manner, desulfurization wastewater takes from the knockout drum underflow of gypsum rotational flow station and vacuum belt dewaterer, use calcium hydroxide adjust ph to 7.0 ~ 9.0 with case 11 during waste water enters, make the heavy metal in waste water, fluorion remove with the form of precipitation simultaneously; By in and case 11 waste water out flow into reaction box 12 and generate zunsober and copper sulfide precipitation by adding organosulfur; Then reaction box 12 connects flocculation tanks 13, in flocculation tanks 13, add flocculation agent and coagulant aids, makes the suspended substance comparing dispersion in waste water form oarse-grained flocs unit; Waste water containing macrobead flocs unit directly enters settler 14 concentration basin and is precipitated at the bottom of pond, in being back to by sub-fraction concentrated solution out bottom settling pond 14 and case 11 as crystal seed, all the other carry out spoil disposal; Settler 14 supernatant liquid enters pH readjustment case 15 and uses hydrochloric acid to carry out the adjustment of pH value; Last desulfurization wastewater qualified discharge.A large amount of weak points is there is: first in this desulfuration waste water treatment process, a large amount of gypsum enters the process of spoil disposal, decrease the utilization of the recyclable resource of gypsum, add solid loading amount and the failure rate of Waste Water Treatment, thus the normal operation of influential system; Secondly, in desulfurization wastewater treating processes, the medicament kind that needs add is various and pharmaceutical quantities large, improves dosing cost, also can affect wastewater effluent water quality on the contrary not up to standard, and running cost increases; Again, be deposited to the gypsum can recycled in the concentrated solution at the bottom of pond in settling pond and can only transport outward landfill because of the interpolation of a large amount of medicament, cause the waste of resource.Based on above reason, the treatment process of pelletizing wastewater desulfurized by fume wet also needs to update.
Summary of the invention
For the defect of prior art, the object of the present invention is to provide a kind of desulfurization wastewater treatment system.
Another object of the present invention is to the treatment process that a kind of desulfurization wastewater is provided.This treatment process is particularly useful for pelletizing wastewater desulfurized by fume wet, and treatment scheme of the present invention is simple, and system solid content is low, recyclable desulfurizing byproduct gypsum and slow-release compound fertilizer while realizing reducing running cost, and final discharge of wastewater meets national standard.
To achieve these goals, present invention employs following technical scheme:
A kind of desulfurization wastewater treatment system, comprises waste water Buffer Pool, sludge pressing equipment, multiple-stage treatment pond, settling pond, pH adjusts back case, wherein:
Described waste water Buffer Pool, water inlet with produce the device of desulfurization wastewater and export and be connected, for collecting desulfurization wastewater and regulating the water yield of described waste water Buffer Pool water outlet;
Described sludge pressing equipment, input terminus is connected with described waste water Buffer Pool water outlet, described sludge pressing is become mud cake for the mud removed in desulfurization wastewater;
Described multiple-stage treatment pond, water inlet is connected with the water outlet of described sludge pressing equipment, carries out physical chemistry process for the waste water that receives from described sludge pressing equipment;
Described settling pond, water inlet is connected with described multiple-stage treatment pond water outlet, carries out solid-liquid separation for the waste water that receives from described multiple-stage treatment pond to waste water; Concentrated solution outlet bottom described settling pond is connected that with described waste water Buffer Pool described for part concentrated solution is back to the crystal seed of described waste water Buffer Pool as described desulfurization wastewater;
Described pH adjusts back case, and water inlet is connected with described settling pond top clear water output, carries out pH regulator for the clear water that receives from described settling pond.
In above-mentioned desulfurization wastewater treatment system, as a kind of preferred implementation, concentrated solution outlet bottom described settling pond is also connected with the input terminus of described sludge pressing equipment, is delivered to described sludge pressing equipment with remaining described concentrated solution after being back to described waste water Buffer Pool.
In above-mentioned desulfurization wastewater treatment system, as a kind of preferred implementation, described multiple-stage treatment pond comprises one-level coagulation basin and two-stage coagulation pond, described one-level coagulation basin, water inlet is connected with the water outlet of described sludge pressing equipment, for controlling the ammonia nitrogen value in waste water; Described two-stage coagulation pond, water inlet is connected with described one-level coagulation basin water outlet, for removing suspended substance and heavy metal ion class impurity in waste water; Described two-stage coagulation pond water outlet is connected with the water inlet of described settling pond.
In above-mentioned desulfurization wastewater treatment system, as a kind of preferred implementation, described desulfurization wastewater treatment system also comprises multiple dosing tank, is connected respectively with described multiple-stage treatment pond, for adding medicament needed for wastewater treatment in described multiple-stage treatment pond.
In above-mentioned desulfurization wastewater treatment system, as a kind of preferred implementation, described desulfurization wastewater treatment system also comprises waste water lifting pump, is arranged between described waste water Buffer Pool and described sludge pressing equipment, for being pumped in described sludge pressing equipment by the waste water of described waste water Buffer Pool.
In above-mentioned desulfurization wastewater treatment system, as a kind of preferred implementation, described sludge pressing equipment is plate-and-frame filter press.
A kind of method for treating desulfurized wastewater, comprises the steps:
Wastewater collection step: desulfurization wastewater is collected in waste water Buffer Pool, and the aquifer yield regulating described waste water Buffer Pool water outlet;
Solids is removed and gypsum recycling step: the waste water of waste water Buffer Pool is introduced sludge pressing equipment to remove mud (solids) in desulfurization wastewater by required flow, and mud is delivered directly to through squeezing the mud cake obtained the recycling that resource is carried out in gypsum storehouse;
The physical chemistry treatment step of waste water, the water outlet after described sludge pressing equipment enters in multiple-stage treatment pond, then respectively to adding required medicament in described multiple-stage treatment pond to remove various impurity in waste water and harmful element;
Solid-liquid separation step, the water outlet processed in described multiple-stage treatment pond is introduced in settling pond, solid-liquid separation is realized by gravity settling, the clear water on described settling pond top flows into pH and to adjust back in case and to regulate pH to emission standard, described settling pond bottom be back to crystal seed as described desulfurization wastewater in described waste water Buffer Pool containing a throw out concentrated solution part, part is discharged containing throw out concentrated solution in addition.
In method for treating desulfurized wastewater of the present invention, as a kind of preferred implementation, described be back to described waste water Buffer Pool after remainingly described be transported to described sludge pressing equipment containing throw out concentrated solution and carry out dewatering and the recovery of mud, the waste water deviate from enters described multiple-stage treatment pond and carries out subsequent disposal.
In method for treating desulfurized wastewater of the present invention, as a kind of preferred implementation, in the physical chemistry treatment step of described waste water, first, water outlet after described sludge pressing equipment enters in one-level coagulation basin, in described one-level coagulation basin, add the ammonia nitrogen value that phosphoric acid salt (such as ammonium phosphate) and magnesium salts (such as magnesium chloride or magnesium sulfate) control in waste water be not more than 8mg/L, the throw out magnesium ammonium phosphate obtained is recovered utilization as slow-release compound fertilizer; Afterwards, the water outlet through described one-level coagulation basin enters two-stage coagulation pond, in described two-stage coagulation pond, add milk of lime, organosulfur, flocculation agent, and regulates waste water ph to alkalescence, to remove suspended substance in waste water, heavy metal ion impurities and fluorion.Preferably, in the waste water in described two-stage coagulation pond, the concentration of described milk of lime is 6wt%-20wt%; The concentration of described organosulfur is 1wt%-25wt%; The concentration of described flocculation agent is 0.13wt%-0.2wt%; More preferably, the concentration of described flocculation agent is 0.13wt%; In described two-stage coagulation pond, the pH value of waste water is adjusted to 8.8 ~ 9.5; Preferably, the order of addition of described milk of lime, organosulfur and flocculation agent is followed successively by milk of lime, organosulfur, flocculation agent, and this order of addition is conducive to effective removal of suspended substance in waste water, heavy metal ion impurities and fluorion.
In method for treating desulfurized wastewater of the present invention, as a kind of preferred implementation, in described solid-liquid separation step, regulate described waste water ph to 6-9, regulate the reagent of described waste water ph to be hydrochloric acid.
In method for treating desulfurized wastewater of the present invention, as a kind of preferred implementation, in described solids removal and gypsum recycling step, in described waste water, the clearance of mud (i.e. solids) is 80% ~ 90%.
In method for treating desulfurized wastewater of the present invention, as a kind of preferred implementation, described sludge pressing equipment is plate-and-frame filter press.
In terms of existing technologies, the present invention has following beneficial effect:
(1) first inventive desulfurization waste water treatment process squeezes through sludge pressing equipment, after squeezing, solid content in waste water significantly reduces, and not only makes the solid loading amount of Waste Water Treatment and failure rate greatly reduce, and improves the work-ing life of system; And can be delivered directly to the recycling of gypsum storehouse through squeezing the mud cake obtained, the resource recovery of gypsum is up to 80 ~ 90%.
(2) further, the present invention carries out ammonia nitrogen removal in one-level coagulation basin, the magnesium ammonium phosphate produced can be recycled as slow-release compound fertilizer in this pond;
(3) the present invention use coagulation basin replace by and three headers that forms of case, reaction box and flocculation tanks, decreases the floor space of whole Waste Water Treatment, decrease operation cost of investment simultaneously, and whole technical process is simple, be easy to realization.
(4) desulfurization wastewater first can make the chemical feeding quantity of whole Waste Water Treatment decrease more than 80% through sludge pressing equipment, and the removal efficiency of Waste Water Treatment is up to more than 95%.
Accompanying drawing explanation
Fig. 1 is traditional desulfurization wastewater treatment system process flow sheet;
Fig. 2 is the schematic diagram of desulfurization wastewater treatment system provided by the invention.
Wherein, shown in figure, description of reference numerals is as follows: 1, waste water Buffer Pool; 2, waste water transferpump; 3, plate-and-frame filter press; 4, one-level coagulation basin; 5, two-stage coagulation pond; 6, settling pond; 7, pH adjusts back case; 11, in and case; 12, reaction box; 13, flocculation tanks; 14, settler; 15, pH adjusts back case.
Embodiment
In order to understand the present invention better, below in conjunction with accompanying drawing, embodiment is adopted to further illustrate technical scheme of the present invention and effect thereof.
As shown in Figure 2, desulfurization wastewater treatment system of the present invention comprises the waste water Buffer Pool 1, sludge pressing equipment, multiple-stage treatment pond, settling pond 6 and the pH that connect successively and adjusts back case 7.Below above parts are illustrated one by one.
Waste water Buffer Pool 1, includes the mouth of a river and water outlet, and its water inlet is connected with the outlet producing desulfurization wastewater device, for collecting desulfurization wastewater and regulating the aquifer yield of described waste water Buffer Pool water outlet, is beneficial to follow-up steady running.The outlet of described generation desulfurization wastewater device can be that the overflow port of gypsum rotational flow station is or/and the knockout drum underflow of vacuum belt dewaterer.In order to ensure the waste water water yield that exports in waste water Buffer Pool and quality better, be provided with whipping appts and liquidometer in waste water Buffer Pool 1, the water outlet of waste water Buffer Pool 1 is provided with flow control valve.
Sludge pressing equipment, comprise waste water input terminus, waste water output terminal and mud cake output terminal, waste water input terminus is connected with waste water Buffer Pool 1 water outlet, in order to successfully the waste water in waste water Buffer Pool is delivered in sludge pressing equipment, also be provided with waste water lifting pump 2 between, waste water can remove most mud or solids in waste water through sludge pressing equipment, preferably can remove 80% ~ 90% mud, and the sludge pressing of removal can also be become mud cake by this sludge pressing equipment, in this mud cake, the overwhelming majority is gypsum, it can be delivered directly to the recycling that resource is carried out in gypsum storehouse.This sludge pressing equipment is preferably plate-and-frame filter press 3, as shown in Figure 2.First waste water significantly can reduce the solid content in waste water through sludge pressing equipment, not only make the solid loading amount of Waste Water Treatment and failure rate greatly reduce, and improve the work-ing life of system.
Multiple-stage treatment pond, water inlet is connected with the waste water output terminal of sludge pressing equipment, carries out physical chemistry process for the waste water that receives from described sludge pressing equipment to this waste water; Multiple-stage treatment pond can be that multiple treating pond is connected successively, realizes different wastewater treatment objects in these treating ponds respectively.Such as multiple-stage treatment pond can be during namely tradition uses three headers and case, reaction box and flocculation tanks, to realize the removal to heavy metal ions in wastewater, fluorion, mercury ion and colloidal solid etc. respectively.
In the present invention, in order to reduce floor space, preferably, described multiple-stage treatment pond is the one-level coagulation basin 4 and two-stage coagulation pond 5 that are connected successively; One-level coagulation basin 4, water inlet is connected with the waste water output terminal of sludge pressing equipment, for controlling the ammonia nitrogen value in waste water; Two-stage coagulation pond 5, water inlet is connected with one-level coagulation basin 4 water outlet, for removing suspended substance and heavy metal ion impurities and fluorion in waste water; Two-stage coagulation pond 4 water outlet is connected with the water inlet of settling pond 6.More preferably, be provided with two dosing tanks above one-level coagulation basin 4, be respectively phosphoric acid salt dosing tank and magnesium salts dosing tank, these two medicine-chests are all connected with one-level coagulation basin 4, for quantitatively adding corresponding medicament to one-level coagulation basin 4.Be provided with three dosing tanks above two-stage coagulation pond 5, be respectively lime milk dosing case, organosulfur dosing tank and flocculation agent dosing tank, these three dosing tanks are all connected with two-stage coagulation pond 5, for quantitatively adding corresponding medicament to two-stage coagulation pond 5.In the present invention, one-level coagulation basin 4 and two-stage coagulation pond 5 can be Conventional waste water treating ponds, are equipped with whipping appts in each pond.
Settling pond 6, include the mouth of a river, top clear water output and bottom containing sedimentary concentrated solution relief outlet, see Fig. 2, settling pond 6 water inlet is connected with two-stage coagulation pond 5 water outlet, carries out solid-liquid separation for the waste water that receives from two-stage coagulation pond 5 by the mode of gravity settling to waste water; Concentrated solution outlet bottom described settling pond is connected that with waste water Buffer Pool 1 partial concentration liquid is back to the crystal seed of waste water Buffer Pool 1 as desulfurization wastewater; Remaining concentrated solution can be discharged, preferably, concentrated solution relief outlet bottom settling pond 6 is also connected with the input terminus of sludge pressing equipment, remaining concentrated solution is delivered to sludge pressing equipment, particularly, remaining concentrated solution (containing throw out) is transported in plate-and-frame filter press 3 and dewaters.
PH adjusts back case 7, and water inlet is connected with settling pond 6 top clear water output, carries out pH regulator for the clear water that receives from settling pond 6.
Inventive desulfurization method of wastewater treatment, preferably adopts desulfurization wastewater treatment system shown in Fig. 2, comprises the following steps:
Wastewater collection step: be collected into by desulfurization wastewater in waste water Buffer Pool 1, by the shock absorption of wastewater disposal basin, makes treatment system can run with stable flow.Particularly, whipping appts and liquidometer is provided with in waste water Buffer Pool 1, the water outlet of waste water Buffer Pool 1 is provided with flow control valve, by wastewater flow in Flow-rate adjustment valve regulation waste water Buffer Pool, mixed by the waste water of whipping appts by collection, the liquid level of waste water in waste water Buffer Pool is understood, to be replenished in waste water Buffer Pool by waste water in time by liquidometer.
Solids is removed and gypsum recycling step: by waste water transferpump 2, the water outlet of waste water Buffer Pool 1 is introduced sludge pressing equipment to remove solids (i.e. mud) in desulfurization wastewater by required flow, is delivered directly to through squeezing the mud cake obtained the recycling that resource is carried out in gypsum storehouse; In waste water described in this step, the clearance of solids can reach 80% ~ 90%; Needed for waste water Buffer Pool 1 water outlet, flow is corresponding with the specification of used sludge pressing equipment.
One-level coagulation basin 4 treatment step: first, the water outlet after described sludge pressing equipment enters in one-level coagulation basin 4, then in one-level coagulation basin 4, adds phosphoric acid salt and magnesium salts by dosing tank, the Mg in waste water
2+, PO
4 3-and NH
4 +can magnesium ammonium phosphate sediment be generated, and ammonium ion is separated from water.Especially when the ratio of the amount of substance of Mg, N and P three is Mg:N:P=1.2:1:1.02, sedimentation effect is best, the ammonia nitrogen value that can effectively control in waste water is not more than 8mg/L, and the magnesium ammonium phosphate sediment obtained again can as slow-release compound fertilizer effective recycling;
Two-stage coagulation pond 5 treatment step: the water outlet through one-level coagulation basin 4 enters two-stage coagulation pond, milk of lime, organosulfur and flocculation agent is added again in two-stage coagulation pond 5, regulate waste water ph to 8.8 ~ 9.5, to remove suspended substance in waste water, heavy metal ion impurities and fluorion.In the waste water in described two-stage coagulation pond, the concentration of described milk of lime is 6wt%-20wt% (such as 7wt%, 10wt%, 12wt%, 15wt%, 17wt%, 19wt%); The concentration of described organosulfur is 1wt%-25wt% (such as 2wt%, 5wt%, 9wt%, 12wt%, 15wt%, 19wt%, 22wt%, 24wt%); The concentration of described flocculation agent is 0.13wt%-0.2wt% (such as 0.15wt%, 0.17wt%, 0.18wt%, 0.19wt%); Preferably, described flocculation agent is concentration is 0.13wt%.Preferably, in the charging box being furnished with stirrer, the order of addition of described milk of lime, organosulfur and flocculation agent is followed successively by milk of lime, organosulfur and flocculation agent, and this order of addition is conducive to effective removal of suspended substance in waste water, heavy metal ion impurities and fluorion.Described flocculation agent is that flocculation agent is commonly used in this area, such as polyacrylamide etc.Described organosulfur can be the flocculation agent that this area is commonly used, such as organosulfur heavy metal chelant DTCR (dithiocar-bamate), TMT15.
Solid-liquid separation step, two-stage coagulation pond 5 water outlet is introduced precipitation in settling pond 6, inside establish mud scraper, solid-liquid separation is realized by gravity settling, the clear water on described settling pond top flows into pH and adjusts back in case, described settling pond bottom be back to crystal seed as described desulfurization wastewater in described waste water Buffer Pool 1 containing a sedimentary concentrated solution part, processed is carried out in being expelled in plate-and-frame filter press 3 containing sedimentary concentrated solution in addition, waste water subsequently enters one-level coagulation basin 4, two-stage coagulation pond 5 and settling pond and pH adjust back case to carry out subsequent disposal, the maximized like this recovery achieving solids of the present invention and mud, in whole treating processes, available solids produces invariably.Preferably, what be back to described waste water Buffer Pool 1 is 10-30% containing sedimentary concentrated solution cumulative volume containing the volume of sedimentary concentrated solution.
PH readjustment case 7 water-quality test: flow into pH by the clear water on settling pond 6 top and adjust back in case 7, adjusts back in case 7 at pH and regulates waste water ph to 6 ~ 9 with hydrochloric acid, and the water entering pH readjustment case meets the outer row's standard of national waste water after measured, recycles.
Embodiment
As shown in Figure 2, present embodiments provide a 2*120 ten thousand tons/year of pelletizer smoke-gas wet desulfurization system wastewater treatment and reuse engineerings, desulfurization wastewater water quality parameter before treatment is as shown in table 1.
Water quality before and after the process of table 1 the present embodiment pelletizing wet flue gas desulfurization waste water
| Project | Unit | Before process | After process |
| Temperature | ℃ | 45-55 | 20-30 |
| PH value | - | 4.0-6.0 | 6.0-9.0 |
| Solid content | mg/l | 10000-12000 | ≤50 |
| Ammonia nitrogen | mg/l | 900-1700 | ≤8 |
| Heavy metal ion | mg/l | 700-1100 | - |
| Mg 2+ | mg/l | 300-1000 | - |
The concrete treatment process of waste water is as follows:
(1) flue gas desulfurization waste-water enters 25m
3waste water Buffer Pool, by collect desulfurization wastewater regulate the aquifer yield of described waste water Buffer Pool water outlet keep constant, wastewater effluent amount is 25m
3/ h.
(2) enter the waste water of sludge pressing equipment plate-and-frame filter press through squeezing effect, remove the mud of in waste water about 85%, sludge pressing is directly delivered to gypsum storehouse and recycles after becoming mud cake.
(3) enter one-level coagulation basin from plate-and-frame filter press waste water out and carry out ammonia nitrogen removal, by adding ammonium phosphate and magnesium sulfate, thus formation magnesium ammonium phosphate sediment, the ammonium phosphate wherein added and the mol ratio of magnesium sulfate are 1.02:1.2, ammonia nitrogen value in waste water is controlled be not more than 8mg/l, and using the magnesium ammonium phosphate that obtains as slow-release compound fertilizer effective recycling.
(4) waste water flowed out from one-level coagulation basin enters two-stage coagulation pond, for regulating the pH value of waste water and removing heavy metal in waste water, suspended substance and fluorion, milk of lime, organosulfur and flocculation agent is added successively in two-stage coagulation pond, after the pH value of waste water is risen to about 9, heavy metal ion a large amount of in waste water all precipitates with the form of oxyhydroxide.Wherein, in the waste water in described two-stage coagulation pond, the concentration of described milk of lime is 10wt%; The concentration of described organosulfur TMT15 is 1wt%; The concentration of described flocculation agent is 0.13wt%.
(5) solid-liquid separation is carried out after the waste water come by two-stage coagulation pond enters settling pond, ensure that the suspended substance of efflux wastewater reaches outer row standard≤50mg/L, directly top clear water being discharged into pH after solid-liquid separation adjusts back in case, making the pH value of waste water control between about 7 by adding hydrochloric acid, processing rear discharge up to standard.Waste water quality after the method process is see table 1.
The desulfurization wastewater treatment system of the present embodiment is compared with conventional waste water disposal system, when waste water outer drained entirely up to standard, greatly reduce solid loading amount and failure rate in waste water, operation and repair and maintenance reduce 80% ~ 90%, the chemical feeding quantity of system decreases 80%, and the removal efficiency of Waste Water Treatment is up to more than 95%, add the utilization ratio of recyclable resource gypsum simultaneously, decrease pollutent to the discharge in environment.
Above embodiment is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field without departing from the spirit and scope of the present invention; can make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. a desulfurization wastewater treatment system, is characterized in that, comprises waste water Buffer Pool, sludge pressing equipment, multiple-stage treatment pond, settling pond, pH adjust back case, wherein:
Described waste water Buffer Pool, water inlet with produce the device of desulfurization wastewater and export and be connected, for collecting desulfurization wastewater and regulating the water yield of described waste water Buffer Pool water outlet;
Described sludge pressing equipment, input terminus is connected with described waste water Buffer Pool water outlet, described sludge pressing is become mud cake for the mud removed in desulfurization wastewater;
Described multiple-stage treatment pond, water inlet is connected with the water outlet of described sludge pressing equipment, carries out physical chemistry process for the waste water that receives from described sludge pressing equipment;
Described settling pond, water inlet is connected with described multiple-stage treatment pond water outlet, carries out solid-liquid separation for the waste water that receives from described multiple-stage treatment pond to waste water; Concentrated solution outlet bottom described settling pond is connected that with described waste water Buffer Pool described for part concentrated solution is back to the crystal seed of described waste water Buffer Pool as described desulfurization wastewater;
Described pH adjusts back case, and water inlet is connected with described settling pond top clear water output, carries out pH regulator for the clear water that receives from described settling pond.
2. desulfurization wastewater treatment system according to claim 1, it is characterized in that, concentrated solution outlet bottom described settling pond is also connected with the input terminus of described sludge pressing equipment, is delivered to described sludge pressing equipment with remaining described concentrated solution after being back to described waste water Buffer Pool.
3. desulfurization wastewater treatment system according to claim 1, it is characterized in that, described multiple-stage treatment pond comprises one-level coagulation basin and two-stage coagulation pond, described one-level coagulation basin, water inlet is connected with the water outlet of described sludge pressing equipment, for controlling the ammonia nitrogen value in waste water; Described two-stage coagulation pond, water inlet is connected with described one-level coagulation basin water outlet, for removing suspended substance and heavy metal ion class impurity in waste water; Described two-stage coagulation pond water outlet is connected with the water inlet of described settling pond.
4. desulfurization wastewater treatment system according to claim 1, it is characterized in that, described desulfurization wastewater treatment system also comprises multiple dosing tank, is connected respectively with described multiple-stage treatment pond, for adding medicament needed for wastewater treatment in described multiple-stage treatment pond.
5. desulfurization wastewater treatment system according to claim 1, it is characterized in that, described desulfurization wastewater treatment system also comprises waste water lifting pump, is arranged between described waste water Buffer Pool and described sludge pressing equipment, for being pumped in described sludge pressing equipment by the waste water of described waste water Buffer Pool.
6. desulfurization wastewater treatment system according to claim 1, it is characterized in that, described sludge pressing equipment is plate-and-frame filter press.
7. a method for treating desulfurized wastewater, is characterized in that, comprises the steps:
Wastewater collection step: desulfurization wastewater is collected in waste water Buffer Pool, and the aquifer yield regulating described waste water Buffer Pool water outlet;
Solids is removed and gypsum recycling step: the waste water of waste water Buffer Pool is introduced sludge pressing equipment to remove mud in desulfurization wastewater by required flow, and mud is delivered directly to through squeezing the mud cake obtained the recycling that resource is carried out in gypsum storehouse;
The physical chemistry treatment step of waste water, the water outlet after described sludge pressing equipment enters in multiple-stage treatment pond, then respectively to adding required medicament in described multiple-stage treatment pond to remove various impurity in waste water and harmful element;
Solid-liquid separation step, the water outlet processed in described multiple-stage treatment pond is introduced in settling pond, solid-liquid separation is realized by gravity settling, the clear water on described settling pond top flows into pH and to adjust back in case and to regulate pH to emission standard, described settling pond bottom be back to crystal seed as described desulfurization wastewater in described waste water Buffer Pool containing a throw out concentrated solution part.
8. method for treating desulfurized wastewater according to claim 7, it is characterized in that, described be back to described waste water Buffer Pool after remainingly described be transported to described sludge pressing equipment containing throw out concentrated solution and carry out dewatering and the recovery of mud, the waste water deviate from enters described multiple-stage treatment pond and carries out subsequent disposal.
9. method for treating desulfurized wastewater according to claim 7, it is characterized in that, in the physical chemistry treatment step of described waste water, first, water outlet after described sludge pressing equipment enters in one-level coagulation basin, the ammonia nitrogen value of adding in described one-level coagulation basin in phosphoric acid salt and magnesium salts control waste water is not more than 8mg/L, and the throw out magnesium ammonium phosphate obtained is recovered utilization as slow-release compound fertilizer; Afterwards, the water outlet through described one-level coagulation basin enters two-stage coagulation pond, in described two-stage coagulation pond, add milk of lime, organosulfur, flocculation agent, and regulates waste water ph to alkalescence, to remove suspended substance in waste water, heavy metal ion impurities and fluorion; Preferably, in the waste water in described two-stage coagulation pond, the concentration of described milk of lime is 6wt%-20wt%; The concentration of described organosulfur is 1wt%-25wt%; The concentration of described flocculation agent is 0.13wt%-0.2wt%; Preferably, the concentration of described flocculation agent is 0.13wt%; In described two-stage coagulation pond, the pH value of waste water is adjusted to 8.8 ~ 9.5; Preferably, the order of addition of described milk of lime, organosulfur and flocculation agent is followed successively by milk of lime, organosulfur, flocculation agent.
10. method for treating desulfurized wastewater according to claim 6, is characterized in that, in described solid-liquid separation step, regulate described waste water ph to 6-9, regulate the reagent of described waste water ph to be hydrochloric acid;
Preferably, in described solids removal and gypsum recycling step, in described waste water, the clearance of solids is 80% ~ 90%;
Preferably, described sludge pressing equipment is plate-and-frame filter press.
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