CN104086048A - Treatment method for nitrogen-containing wastewater in iron and steel industry - Google Patents
Treatment method for nitrogen-containing wastewater in iron and steel industry Download PDFInfo
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- CN104086048A CN104086048A CN201410354961.2A CN201410354961A CN104086048A CN 104086048 A CN104086048 A CN 104086048A CN 201410354961 A CN201410354961 A CN 201410354961A CN 104086048 A CN104086048 A CN 104086048A
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Abstract
The invention discloses a treatment method for nitrogen-containing wastewater in iron and steel industry, which comprises a CMBR technology. The treatment method comprises the following specific steps of: (1) introducing nitrogen-containing wastewater into the CMBR reaction tank by a regulating tank, adding a carbon source and monopotassium phosphate, and keeping dissolved oxygen to 0.2-0.5mg/L; (2) introducing mixed liquor which reacts for 16 hours in the step 1 into an active sludge separator, exhausting the separated sludge into a sludge storage tank, or introducing the separated sludge into the CMBR reaction tank for continuously reacting, exhausting clear liquor to the clear water tank for storage, and determining recycling amount and exhausting amount according to practical conditions. The treatment method disclosed by the invention is integrated with anoxic treatment, aerobic treatment, settling, concentrating and separating, so that floor area is greatly reduced, and process flow is shortened; and water quality of membrane permeate is stable, and reaches first-grade requirements of Steel Industrial Water Pollutant Discharge Standards.
Description
Technical field
The present invention relates to industrial sewage process field, particularly a kind of steel industry nitrogenous effluent treatment method.
Background technology
When steel industry is produced, can use a large amount of nitric acid, these nitric acid overwhelming majority can be converted into nitrate, then enters Waste Water Treatment, thereby has caused waste water total nitrogen to exceed standard.
The method of this class waste water of existing processing adopts " anoxic+aerobic+precipitation " method, specifically, under anoxia condition, add carbon source, microcosmic salt as nutrition agent, utilize the biological degradation of denitrifying bacterium, remove the nitric nitrogen in waste water, anoxic pond water outlet enters Aerobic Pond, by aerobic microbiological, removes residue carbon source, and then outputted aerobic water enters settling tank and carries out mud-water separation, supernatant liquor qualified discharge, bottom mud enters concentration basin and improves solid content, then carries out mechanical dehydration, and mud cake outward transport is disposed; Facts have proved, there is following shortcoming in this method: (1) sludge loading is low, and floor space is large, needs to build many group anoxic pond, Aerobic Pond, settling tank, concentration basin; (2) microorganism is easily along with water outlet is run off, and treatment effect is unstable.Waste water is when different ponds body flows, and a large amount of microorganisms are carried in water outlet meeting secretly, and the microbial biomass of single pond body declines, thereby affects the removal of Pollutants in Wastewater; (3) settling tank mud-water separation weak effect.The concentration of active sludge and water are very approaching, adopt the method for gravity settling to be beneficial to isolating active mud and water, thereby affect effluent quality; (3) utilization of carbon source rate is not high.Traditional technology is easily excessive when adding carbon source, must adopt aerobic process guarantee water outlet COD stably reaching standard; (4) complex treatment process, level of automation is low, and running maintenance difficulty is larger.
Self-stip concentrates membrane bioreaction technology (CMBR), that a kind of membrane separation technique and circulating carrier biomembrance process (biochemical technology) of utilizing vibrates overclocking the wastewater efficient treatment technology of on-line cleaning and the combination of highdensity plywood biodegradation technique, can be widely used in life, Industrial Wastewater Treatment, the denitrogenation processing that is applied to nitrate in steel industry waste water, has not yet to see report.
Summary of the invention
For the problems referred to above, a kind of steel industry nitrogenous effluent treatment method is provided, by microbiological treatment, the nitric nitrogen in waste water is controlled in 15mg/L, improve stability and the efficiency of wastewater treatment, the present invention is achieved in that
A steel industry nitrogenous effluent treatment method, comprises CMBR technology, it is characterized in that, comprises the following steps:
(1) nitrogenous effluent is introduced in CMBR reaction tank and reacted 0.5 ~ 16h by equalizing tank, add carbon source and potassium primary phosphate, keep dissolved oxygen at 0.2-0.5mg/L;
(2) the reacted mixed solution of step 1 is introduced in sludge separator, as required, by the mud after separation or enter sludge storage pool, or introduced CMBR reaction tank and continue reaction, clear liquid discharging to clean water basin store, and according to practical situation, determine reuse amount and quantity discharged.
Preferably, add carbon source and potassium primary phosphate in the present invention in step 1 in step 1, the mass ratio that makes carbon in nitrogenous effluent, nitrogen, phosphorus is 100:(25 ∽ 5): (5 ~ 1).
Preferably, carbon source described in step 1 of the present invention is methyl alcohol.
Preferably, sludge separator is vibration-type membrane separating machine described in step 2 step 2 of the present invention, uses PVDF/PTFE organic membrane, membrane pore size 10 ~ 100nm, operating pressure 3-5bar, vibrational frequency 50HZ, Oscillation Amplitude 12-17mm.
Different from existing steel mill cold rolling wastewater denitrification treatment process, the technology that employing CMBR biological denitrificaion of the present invention combines with active sludge separating machine, collection anoxic, aerobic, precipitate, concentrate, be located away from one, greatly reduced floor space, shortened technical process, CMBR reaction tank, under the condition of additional carbon, by the biological degradation of active sludge, is removed the total nitrogen in water, active sludge separating machine carries out feed separation work by organic ultra-filtration membrane, all microorganisms and suspended substance can not see through film, thereby can not cause the loss of microorganism, be conducive to improve reaction tank biomass, diaphragm is by the reciprocal high-frequency vibration of special machine device, there is the precision of removal high, processing power is large, automatically clean, the advantage of Automatic Control, can accurately control carbon source dosage, not remaining carbon source produces, the sludge concentration of biological reaction tank can reach above (other techniques are generally 3 ~ 5g/L) the permeate water conditioning of 15g/L, reach < < Iron And Steel Industry water emission standard > > (GB13456-2012) requirement, the present invention adopts sludge separator to omit traditional settling tank and concentration basin, can make system simplification, saves space and operation, reduces investment and working cost.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention process flow diagram.
Embodiment
Below by concrete example, technical scheme of the present invention is described further.
Embodiment 1 adopts method of the present invention to process the high concentration nitrogen-containing waste water that cold rolling workshop section of certain steel mill discharges.
(1) waste water that cold rolling workshop section of Jiang Mou steel mill discharges is introduced equalizing tank, measures total average nitrogen concentration 600mg/L in water, COD mean concns 40mg/L, and PH is between 6 ~ 9.
(2) nitrogenous effluent is introduced in CMBR reaction tank, it is 1600mg/L that methyl alcohol adds concentration, and potassium primary phosphate adds concentration 24 mg/L; Denitrification rates 0.06kgNO3-N ∕ (kgMLSSd); Sludge loading 15g/L; In pond, establish diving mixer and carry out mix and blend, residence time 16h hour;
(3) mixed solution of CMBR reaction tank being discharged is introduced in sludge separator, and in the present embodiment, active sludge separating machine is vibration-type membrane separating machine, uses PVDF/PTFE organic membrane, membrane pore size 50nm, membrane flux 200L/ (m
2h), operating pressure 3-5bar, vibrational frequency 50HZ, Oscillation Amplitude 13mm.
In concrete operations, the time of reacting in nitrogenous effluent introducing CMBR reaction tank is set as between 0.5-16h according to particular case; Vibration-type membrane separating machine PVDF/PTFE organic membrane aperture can be chosen in the scope of 10 ~ 100nm, and Oscillation Amplitude is in the scope of 12-17mm.
Sludge storage pool after separation is entered to sludge storage pool, clear liquid discharging to clean water basin store, according to practical situation, determine reuse amount and quantity discharged, the total average nitrogen concentration of active sludge separating machine water outlet is 8mg/L, COD mean concns is 16mg, and water outlet meets the standard of < < Iron And Steel Industry water emission standard > > (GB13456-2012) defined.
The above embodiment has only expressed embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some improvement, these improve and all belong to protection scope of the present invention.
Claims (4)
1. a steel industry nitrogenous effluent treatment method, comprises CMBR technology, it is characterized in that, comprises the following steps:
(1) nitrogenous effluent is introduced in CMBR reaction tank and reacted 0.5 ~ 16h by equalizing tank, add carbon source and potassium primary phosphate, keep dissolved oxygen at 0.2-0.5mg/L;
(2) the reacted mixed solution of step 1 is introduced in sludge separator, as required, by the mud after separation or enter sludge storage pool, or introduced CMBR reaction tank and continue reaction, clear liquid discharging to clean water basin store, and according to practical situation, determine reuse amount and quantity discharged.
2. a kind of steel industry nitrogenous effluent treatment method according to claim 1, is characterized in that, in step 1, add carbon source and potassium primary phosphate, the mass ratio that makes carbon in nitrogenous effluent, nitrogen, phosphorus is 100:25-5:5-1.
3. a kind of steel industry nitrogenous effluent treatment method according to claim 2, is characterized in that, carbon source described in step 1 is methyl alcohol.
4. according to a kind of described steel industry nitrogenous effluent treatment method of one of claim 1-3, it is characterized in that, described in step 2, sludge separator is vibration-type membrane separating machine, use PVDF/PTFE organic membrane, membrane pore size 10-100nm, operating pressure 3-5bar, vibrational frequency 50HZ, Oscillation Amplitude 12-17mm.
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Citations (7)
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| JP2006167549A (en) * | 2004-12-14 | 2006-06-29 | Kurita Water Ind Ltd | Apparatus and method for treating waste water containing nitrogen compound and inorganic ion |
| US20070241053A1 (en) * | 2006-03-31 | 2007-10-18 | Masayuki Uchida | Method of treating at a high-temperature waste liquid from production plant for hydrocarbons or oxygen-containing compounds |
| CN201276438Y (en) * | 2008-10-10 | 2009-07-22 | 樊利华 | Intelligent ultrasonic vibration membrane biological reaction sewage treatment and reclaimed water recycling apparatu |
| CN102139990A (en) * | 2011-01-21 | 2011-08-03 | 樊利华 | Ultrasonic combined waste water treatment process and system of refuse leachate |
| CN102276122A (en) * | 2011-07-27 | 2011-12-14 | 北京京诚科林环保科技有限公司 | Denitrification process of stainless steel cold rolling mixed acid wastewater |
| CN103708675A (en) * | 2013-12-13 | 2014-04-09 | 广东省环境科学研究院 | Landfill leachate treatment method based on high-frequency vibration membrane |
| CN103833174A (en) * | 2014-03-28 | 2014-06-04 | 文登市西郊热电有限公司 | Device and method for treating high-concentration ammonia nitrogen wastewater |
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2014
- 2014-07-24 CN CN201410354961.2A patent/CN104086048B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006167549A (en) * | 2004-12-14 | 2006-06-29 | Kurita Water Ind Ltd | Apparatus and method for treating waste water containing nitrogen compound and inorganic ion |
| US20070241053A1 (en) * | 2006-03-31 | 2007-10-18 | Masayuki Uchida | Method of treating at a high-temperature waste liquid from production plant for hydrocarbons or oxygen-containing compounds |
| CN201276438Y (en) * | 2008-10-10 | 2009-07-22 | 樊利华 | Intelligent ultrasonic vibration membrane biological reaction sewage treatment and reclaimed water recycling apparatu |
| CN102139990A (en) * | 2011-01-21 | 2011-08-03 | 樊利华 | Ultrasonic combined waste water treatment process and system of refuse leachate |
| CN102276122A (en) * | 2011-07-27 | 2011-12-14 | 北京京诚科林环保科技有限公司 | Denitrification process of stainless steel cold rolling mixed acid wastewater |
| CN103708675A (en) * | 2013-12-13 | 2014-04-09 | 广东省环境科学研究院 | Landfill leachate treatment method based on high-frequency vibration membrane |
| CN103833174A (en) * | 2014-03-28 | 2014-06-04 | 文登市西郊热电有限公司 | Device and method for treating high-concentration ammonia nitrogen wastewater |
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