CN105236613A - Method for treating phosphorus-containing wastewater by using desulfurization wastewater sludge - Google Patents
Method for treating phosphorus-containing wastewater by using desulfurization wastewater sludge Download PDFInfo
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- CN105236613A CN105236613A CN201510651763.7A CN201510651763A CN105236613A CN 105236613 A CN105236613 A CN 105236613A CN 201510651763 A CN201510651763 A CN 201510651763A CN 105236613 A CN105236613 A CN 105236613A
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Abstract
The invention discloses a method for treating phosphorus-containing wastewater by using desulfurization wastewater sludge. The method includes the following steps: step S1, carrying out precipitation, coagulation and sedimentation treatment on desulfurization wastewater, and generating the desulfurization wastewater sludge; step S2, separating the desulfurization wastewater sludge from a liquid phase, and dehydrating; step S3, adding the desulfurization wastewater sludge after dehydration into the phosphorus-containing wastewater; and step S4, stirring the wastewater after mixing, allowing to stand and layer, and allowing the supernatant to be effluent and discharged. With use of the characteristic that the desulfurization wastewater sludge mostly comprises Ca<2+> insoluble substances and colloid materials, phosphorus of the high-concentration phosphorus-containing wastewater is efficiently removed, the waste is used for treating the waste, a large amount of cost is saved, and waste recycling increases the output value. In addition, heavy metals in the desulfurization wastewater after sulfide precipitation form precipitates extremely difficult to dissolve, the stability is good, the release quantity to water is extremely low in the process of phosphorus removal, and the problem of secondary pollution does not appear.
Description
Technical field
The invention belongs to sewage treatment area, relate to a kind of method of sewage dephosphorization, particularly relate to a kind of method utilizing desulfurization wastewater sludge treatment phosphorus-containing wastewater.
Background technology
Power industry is fast-developing with China economic construction, and has made tremendous contribution for the development of national economy, becomes the mainstay industry of China's Economic development.But coal-burning power plant produces a large amount of containing SO because of coal-fired
2flue gas, be one of major reason causing China's air environmental pollution.Coal-fired plant flue gas process often adopts wet desulphurization, ensures reliability and the security of desulphurization system from flue gas desulphurization system China and foreign countries row partial desulfurization waste water.Desulfurization wastewater is slightly acidic, suspension object height, and particle is tiny, main containing dust and desulfurization product; Muriate containing solubility and fluorochemical, nitrate etc., also have the heavy metal ion such as deliquescent Hg, Pb, Ni, As, Cd, Cr, wherein much belong in national environmental standard and require the strict first kind pollutent controlled, this is that the process of waste water adds very large difficulty.The process of desulfurization wastewater is by adding alkali neutralization, and adds Na
2s, makes most of heavy metal precipitation remove; Adding flocculation agent and coagulant aids again makes colloid and suspended particle cohesion occur and assemble, outer row after settling pond solid-liquid separation.Therefore, desulfurization wastewater mud can be produced in desulfurization wastewater treating processes, mostly be the flocs unit precipitations such as insoluble calcium precipitation, heavy metal oxide precipitation and colloid.
Phosphorus is one of pollutent main in municipal effluent, and be also the major reason causing body eutrophication, phosphorus-containing wastewater directly discharges and will cause serious water pollution.The particularly process of high-density phosphorus sewage, due to the restriction that waste water quality characteristic and carbon source supply, adopts traditional enhanced biological phosphorus removal technique to be difficult to reach ideal effect; If adopt chemical dephosphorization technology, then face again the higher problem of reagent cost.Therefore, seek suitable low cost chemistry dephosphorization technique, just become the hot issue of current high-density phosphorus sewage treatment area.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method utilizing desulfurization wastewater sludge treatment phosphorus-containing wastewater, effectively can solve the dephosphorization problem that power plant desulfurization waste removes problem and high-density phosphorus sewage.
The present invention solves the problems of the technologies described above the technical scheme adopted to be to provide a kind of method utilizing desulfurization wastewater sludge treatment phosphorus-containing wastewater, comprise the steps: step S1: desulfurization wastewater to be precipitated, coagulation and settlement treatment, generate desulfurization wastewater mud; Step S2: described desulfurization wastewater mud is separated with liquid phase, and dewaters; Step S3: add the desulfurization wastewater mud after dehydration in phosphorus-containing wastewater; Step S4: after mixed sewage is stirred stratification, supernatant liquor can Chinese effluent.
The above-mentioned method utilizing desulfurization wastewater sludge treatment phosphorus-containing wastewater, wherein, described step S1 comprises: first in desulfurization wastewater, add lime and neutralize, and improves pH value and preliminary precipitation part heavy metal; Then Na is added
2s makes residual gravity metal form precipitation; Adding flocculation agent and coagulant aids again makes the colloidal solid in described desulfurization wastewater and suspended particle cohesion occur and assemble, and through the sedimentation of predetermined for some time, produces desulfurization wastewater mud.
The above-mentioned method utilizing desulfurization wastewater sludge treatment phosphorus-containing wastewater, wherein, adds the desulfurization wastewater mud after described dehydration by the dosage of 0.1 ~ 15g/L in described step S3 in described phosphorus-containing wastewater.
The above-mentioned method utilizing desulfurization wastewater sludge treatment phosphorus-containing wastewater, wherein, adds the desulfurization wastewater mud after dehydration by the dosage of 2 ~ 3g/L in described step S3 in phosphorus-containing wastewater.
The above-mentioned method utilizing desulfurization wastewater sludge treatment phosphorus-containing wastewater, wherein, the positive phosphorus content of described phosphorus-containing wastewater is 10 ~ 500mg/L.
The above-mentioned method utilizing desulfurization wastewater sludge treatment phosphorus-containing wastewater, wherein, mixed sewage agitator is stirred 0.5 ~ 5h by described step S4, and after standing 0.25 ~ 2h layering, supernatant liquor can Chinese effluent.
The above-mentioned method utilizing desulfurization wastewater sludge treatment phosphorus-containing wastewater, wherein, the agitator in described step S4 is six agitators, and the speed range of described agitator is per minute 50 ~ 100 turns, and churning time is 2 ~ 3h.
The present invention contrasts prior art following beneficial effect: the method utilizing desulfurization wastewater sludge treatment phosphorus-containing wastewater provided by the invention, utilizes desulfurization wastewater mud mostly to be Ca
2+indissoluble thing and the feature of colloidality material efficiently remove the phosphorus of high-density phosphorus sewage, the handling problems of power plant desulfurization waste and the dephosphorization problem of high-density phosphorus sewage can be solved, the treatment of wastes with processes of wastes against one another, had both saved great amount of cost, and realizing again refuse reuse increases the output value.In addition, the heavy metal in desulfurization wastewater forms the throw out of pole indissoluble after sulfide precipitation, good stability, minimum to burst size in water in dephosphorization process, there will not be the problem of secondary pollution.
Accompanying drawing explanation
Fig. 1 is the process schematic that the present invention utilizes desulfurization wastewater sludge treatment phosphorus-containing wastewater;
Fig. 2 is the phosphor-removing effect schematic diagram that the present invention utilizes desulfurization wastewater sludge treatment phosphorus-containing wastewater.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the process schematic that the present invention utilizes desulfurization wastewater sludge treatment phosphorus-containing wastewater.
Refer to Fig. 1, the method utilizing desulfurization wastewater sludge treatment phosphorus-containing wastewater provided by the invention, comprises the steps:
Step S1: to precipitate desulfurization wastewater, coagulation and settlement treatment, generates desulfurization wastewater mud;
Step S2: described desulfurization wastewater mud is separated with liquid phase, and dewaters;
Step S3: add the desulfurization wastewater mud after described dehydration in described phosphorus-containing wastewater;
Step S4: after mixed sewage is stirred stratification, supernatant liquor can Chinese effluent.
The present invention gets the mud after dehydration, joins in high-density phosphorus sewage with different dosage, regulates its hydraulics, after certain hour hybrid reaction, leaves standstill and makes deposit seeds thing and supernatant liquor solid-liquid separation, and discharge water outlet, reclaims solid precipitation; After utilizing desulfurization wastewater process, mud mostly is the feature of calcium salt indissoluble thing and colloidality material, the phosphorus in high-density phosphorus sewage is removed by chemisorption, effectively can solve the removal problem of power plant desulfurization wastewater sludge and the dephosphorization problem of high-density phosphorus sewage, can be coal-burning power plant and phosphorus-containing wastewater process saving great amount of cost every year, there is significant economy and environment benefit.
Provide a specific embodiment below, test and carry out on six agitators, comprise the following steps:
The first step: secure ph is 5.03, positive phosphorus concentration is the solution containing phosphate of 169.6mg/L.
Second step: add lime and neutralize in desulfurization wastewater, improve pH value, preliminary precipitation part heavy metal, adds Na
2s, makes most heavy metal form precipitation.Adding flocculation agent and coagulant aids again makes colloidal solid and suspended particle cohesion occur and assemble, and through sedimentation after a while, produces a large amount of desulfurization wastewater mud.
3rd step: by desulfurization wastewater mud and liquid phase separation, and dewater.
4th step: respectively with 0.1,0.2,0.3,0.4,0.5,0.9,1.3,1.7, the dosage of 2g adds desulfurization wastewater mud in the high-density phosphorus sewage of 150mL;
5th step: arranging rotating speed is 80rpm, stirs 3h, leaves standstill after 15min and gets supernatant liquid, measures former water and water outlet pH and positive phosphorus concentration.
As shown in Figure 2, when desulfurization wastewater mud dosage is 2.7g/L, water outlet positive phosphorus concentration 5.92mg/L, pH are 7.13, and positive tp removal rate reaches 96.51%.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little amendment and perfect, therefore protection scope of the present invention is when being as the criterion of defining with claims.
Claims (7)
1. utilize a method for desulfurization wastewater sludge treatment phosphorus-containing wastewater, it is characterized in that, comprise the steps:
Step S1: to precipitate desulfurization wastewater, coagulation and settlement treatment, generates desulfurization wastewater mud;
Step S2: described desulfurization wastewater mud is separated with liquid phase, and dewaters;
Step S3: add the desulfurization wastewater mud after described dehydration in phosphorus-containing wastewater;
Step S4: after mixed sewage is stirred stratification, supernatant liquor can Chinese effluent.
2. utilize the method for desulfurization wastewater sludge treatment phosphorus-containing wastewater as claimed in claim 1, it is characterized in that, described step S1 comprises: first in desulfurization wastewater, add lime and neutralize, and improves pH value and preliminary precipitation part heavy metal; Adding flocculation agent and coagulant aids again makes the colloidal solid in described desulfurization wastewater and suspended particle cohesion occur and assemble, and through the sedimentation of predetermined for some time, produces desulfurization wastewater mud.
3. utilize the method for desulfurization wastewater sludge treatment phosphorus-containing wastewater as claimed in claim 1, it is characterized in that, in described step S3, in described phosphorus-containing wastewater, add the desulfurization wastewater mud after described dehydration by the dosage of 0.1 ~ 15g/L.
4. utilize the method for desulfurization wastewater sludge treatment phosphorus-containing wastewater as claimed in claim 3, it is characterized in that, in described step S3, in phosphorus-containing wastewater, add the desulfurization wastewater mud after dehydration by the dosage of 2 ~ 3g/L.
5. the method utilizing desulfurization wastewater sludge treatment phosphorus-containing wastewater as described in claim 3 or 4, is characterized in that, the positive phosphorus content of described phosphorus-containing wastewater is 10 ~ 500mg/L.
6. utilize the method for desulfurization wastewater sludge treatment phosphorus-containing wastewater as claimed in claim 1, it is characterized in that, mixed sewage agitator is stirred 0.5 ~ 5h by described step S4, and after standing 0.25 ~ 2h layering, supernatant liquor can Chinese effluent.
7. utilize the method for desulfurization wastewater sludge treatment phosphorus-containing wastewater as claimed in claim 6, it is characterized in that, the agitator in described step S4 is six agitators, and the speed range of described agitator is per minute 50 ~ 100 turns, and churning time is 2 ~ 3h.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100065505A1 (en) * | 2006-10-24 | 2010-03-18 | Poul Erik Bundgaard Jensen | Apparatus and Method for Removal of Ammonia from a Medium |
| CN101993169A (en) * | 2009-08-18 | 2011-03-30 | 宝山钢铁股份有限公司 | Treatment method of sintering flue gas desulphurization wastewater |
| CN104370364A (en) * | 2014-11-18 | 2015-02-25 | 上海电力学院 | Method for enhancing nitration and phosphorus removal through co-treatment |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100065505A1 (en) * | 2006-10-24 | 2010-03-18 | Poul Erik Bundgaard Jensen | Apparatus and Method for Removal of Ammonia from a Medium |
| CN101993169A (en) * | 2009-08-18 | 2011-03-30 | 宝山钢铁股份有限公司 | Treatment method of sintering flue gas desulphurization wastewater |
| CN104370364A (en) * | 2014-11-18 | 2015-02-25 | 上海电力学院 | Method for enhancing nitration and phosphorus removal through co-treatment |
Non-Patent Citations (1)
| Title |
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| 陈毅忠等: "自来水厂脱水铝污泥对水中磷的吸附去除研究", 《中国给水排水》 * |
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