CN1122781A - Dinitrodiazophenol industrial wastewater treatment - Google Patents

Abstract

In the technology, the methods of the chemical flocculatin and the oxidation-reduction are used. The prodn. process involves neutral reaction, air and light exposition, anaerobic treatment, coupled reaction, coagulation settling, oxidation-reduction, alkali-out, fine filtration, and magnetization. Advantages: waste treatment by using waste, easy management, low energy cost, good effect, no secondary pollution, meeting with the drainage demands, and suited to fired-process industry waste water treatment.

Description

Dinitrodiazophenol industrial wastewater treatment

The present invention relates to the processing of waste water, particularly the improvement technology of dinitrodiazophenol trade effluent.

A large amount of acid waste water and the alkaline waste waters of discharging in initiating equipment dinitrodiazophenol (DDNP) production process, contain a large amount of multiple harmful substances, colourity is up to 1～40,000 times, the pH value of acid waste water is 2-4, the pH value of alkaline waste water is 12～14, oxybenzene compound content height, its molecular linkage is difficult to break removal.In the prior art, alkaline waste water is handled with heating evaporation or spontaneous evaporation, slow evaporation, the energy consumption height, long processing period does not adapt to the processing of waste discharge amount in producing at all; Acid waste water is handled with charcoal absorption, though the purification and decoloration effect is arranged, objectionable impurities is removed not exclusively.Gac is easily saturated, and effectively life cycle is short, changes frequently, and regeneration of activated carbon is handled the energy consumption height, and expense is big, the running cost costliness of wastewater treatment, and inconvenience is promoted the use of.(as nitro-diazophenol wasted water treatment process, number of patent application: 931118328) though effect is good, the energy consumption height has the chlorine secondary pollution to the processing of electrolytic flocculation oxidation reduction process, and handling working cost is about 30 yuan of ton waste water, administers producer and is difficult to accept.

The objective of the invention is to overcome the shortcoming of prior art, a kind of dinitrodiazophenol industrial wastewater treatment is provided, the treatment of wastes with processes of wastes against one another cuts down the consumption of energy and handles working cost, the easy handling management, and regulation effect is good, non-secondary pollution.Adapt to the processing, the particularly improvement of dinitrodiazophenol trade effluent of firer's trade effluent.

The present invention is achieved in that and adopts chemical flocculation and oxidation reduction process, the treatment of wastes with processes of wastes against one another, its technological process is: (1) puts into the neutralization reaction pond with the acid waste water and the alkaline waste water that are produced in the production process, store 3～5 days and carry out neutralization reaction, the waste water composition is simplified, for the treatment process of back creates conditions.After the neutralization reaction, the waste water pH value is 10～11, and its composition tends towards stability.(2) waste water after the neutralization reaction is emitted (extracting out or the outflow of the natural discrepancy in elevation with pump), the stepped appearance aerating apparatus of flowing through carries out natural aeration, exposure, flows into airtight anaerobic pond again, anaerobic treatment 5-10 days.The aerating apparatus of flowing through makes oxygen level increase in the waste water, and partial oxidation reaction takes place, and reduces COD, BOD.Make the hydroxyl in its thing dinitrophenol(DNP) that mainly develops the color (OH) be oxidized to dinitrobenzene formic acid.COD, BOD in anaerobic treatment degraded part organic solid thing, the reduction waste water.(3) waste water after the anaerobic treatment is sent into (taking out or the discharging of the natural discrepancy in elevation) coupled reaction pond and active sludge and carried out coupled reaction with pump.Active sludge is analysed process and is obtained by coagulating sedimentation, redox, alkali, and its consumption is 10～20% of a processed wastewater volume, and optimum value is 18%.When adding active sludge the limit edged stir, stirring velocity＜30 rev/min, stirring velocity progressively slows down.Active sludge adds the back to be continued slowly to stir one minute, and natural sedimentation is 2-4 hours again, and clear liquid is sent into the processing that coagulative precipitation tank descends operation, mud is after the pressure filter press filtration, mud cake is put the drying bed mummification into, and the plaster after the mummification is recycled after the pyrolysis processing through 80～300 ℃ of dry thermal crackings.After coupled reaction is handled, the colourity of waste water, COD, BOD, objectionable impurities clearances such as sulfide reach 25%, and pH value is reduced to about 9, and the condensation product in the waste water forms big molecular grouping precipitation.(4) waste water and clear liquid after the coupled reaction is sent into (taking out or the outflow of the natural discrepancy in elevation) coagulative precipitation tank with pump, the highly efficient composite coagulant for industrial wastewater treatment of adding 8～10 ‰, the limit edged stirs, stirring velocity＜30 rev/min, stirring velocity progressively slows down, and filling finishes and continues slowly to stir 2-3 minutes, and natural sedimentation is 2-4 hours again, clear liquid is sent into the redox pond, and the active sludge suction activated sludge tank that is settled out is standby.After coagulating sedimentation was handled, the pH value of waste water reduced to 3～4, and objectionable impurities clearances such as colourity, COD, BOC, sulfide reach more than 95%.(5) waste water and clear liquid that coagulating sedimentation is gone out is sent into and is carried out the redox processing in the redox pond.Lay iron filings or ferric oxide in the redox pond, evenly lay, the degree of depth that lays is lower than 0.2～0.3 meter of the processed water surface, and the redox treatment time is 24～72 hours, Best Times 48 hours.Clear liquid after the redox is sent into alkali analyse the pond, high for chroma in waste water, the highly efficient composite coagulant for industrial wastewater treatment of adding 0.8～1.2 ‰ is sent into alkali again and is analysed the pond after decolouring and handling, and it is standby that throw out is sent into activated sludge tank.Handle through redox, the pH value of waste water rises to 5～6.(6) waste water and clear liquid after redox is handled is sent into (taking out or the natural discrepancy in elevation flows into pump) alkali and is analysed and carry out alkali in the pond and analyse processing, add alkaline agent, as: lime, carbide slag, sodium hydroxid, add-on are pressed the pH value of waste water and are determined, every raising pH value 1 adds lime 0.2～0.3kg/ rice ³Waste water makes the pH value of waste water reach 6～9.8-12 rev/mins of limit edged stirring, stirring velocitys, natural sedimentation is 6～8 hours then.It is standby that throw out is sent into activated sludge tank.(7) with pump alkali being analysed clear liquid in the pond inserts smart filter tower and carries out the essence filter and handle.Smart filter tower is interior from being filled with quartz sand, lime carbonate, coking coal, charcoal down.Smart elimination removes remaining suspended substance.(8) magnetization is handled, and the clear liquid that essence the leaches magnetizing system of flowing through is handled, and handles the back qualified discharge.Magnetizing system is provided with the annular permanent magnet, and magnetizing field is 8000～15000 Gausses.Magnetization is handled and is removed remaining iron ion and heavy metal ion in the waste water.

The present invention has following characteristics: (1) utilizes active sludge to carry out coupled reaction and handles, and utilizes waste iron filing, ferric oxide to carry out redox and handles, and utilize lime, carbide slag to carry out alkali and analyse processing, the treatment of wastes with processes of wastes against one another, raw material is easy to get; (2) working cost of processing waste water is cheap, and running cost only is 1/3 of an electrolytic oxidation reduction method, and 1/10 of active carbon adsorption is handled running cost and is lower than 10 yuan of/ton waste water; (3) energy consumption is low, and Pyrogentisinic Acid's compound carries out the pyrolysis reuse to sludge ash again with the coprecipitated removal of coacervation in the governance process, has avoided the electrolytic flocculation oxidation reduction process big shortcoming of electrolysis device processes waste water current consumption; (4) regulation effect is good, and objectionable impurities is removed fully, to the environment non-secondary pollution, can reach GB8978-88 " national sewage comprehensive emission standard " and GB4278-84 " dinitrodiazophenol industrial pollutants wastewater discharge standard "; (5) convenient operation and management.The improvement of suitable firer's trade effluent (as DDNP waste water) is used.On this technology basis, change the prescription of coagulating agent, also be applicable to the improvement of papermaking, process hides, printing and dyeing and other chemical engineering industry waste water.

The present invention further describes below with reference to accompanying drawing and embodiment:

Fig. 1 is a process flow sheet.

Embodiment handles dinitrodiazophenol (DDNP) trade effluent, and its technological process is: (1) puts into the neutralization reaction pond with acid waste water and alkaline waste water, stores 4 days and carries out neutralization reaction, makes its stable components, and pH value reaches 10～11.(2) waste water after the neutralization reaction is emitted (natural discrepancy in elevation outflow), the stepped appearance aerating apparatus of flowing through carries out natural aeration, exposure, increases the oxygen level in the waste water, makes the hydroxyl in its thing dinitrophenol(DNP) that mainly develops the color (OH) be oxidized to dinitrobenzene formic acid.Waste water behind the exposure aeration flows into airtight anaerobic pond, anaerobic treatment 7 days, and degraded part organic solid thing reduces COD, BOD in the waste water.(3) waste water after the anaerobic treatment is put into (natural discrepancy in elevation inflow) coupled reaction pond, carried out coupled reaction with active sludge.The consumption of active sludge is 18% of a processed wastewater volume, when adding active sludge the limit edged stir, stirring velocity＜30 rev/min, and progressively slow down, add the back and continue to stir one minute, natural sedimentation is 3.5 hours again, with pump clear liquid is drawn into coagulative precipitation tank, mud is after the pressure filter press filtration, mud cake is put the drying bed mummification into, and the plaster after the mummification is through 80～300 ℃ of dry thermal crackings, and the plaster after the pyrolysis processing is used for manufacture waste-water treatment efficient compound coagulant.In the coupled reaction process, because yin, yang ionic both sexes effect in the active sludge makes its condensation product form big molecular grouping precipitation.Pressure filter is made by oneself by our company.(4) waste water and clear liquid after the coupled reaction is put into (the natural discrepancy in elevation is put into) coagulative precipitation tank, added 8 ‰ highly efficient composite coagulant for industrial wastewater treatment, the limit edged stirs, stirring velocity＜30 rev/min, and stirring velocity progressively slows down.Filling finishes, and continues to stir 2 minutes, and natural sedimentation is 3 hours again.Clear liquid is used pump suction redox pond, and the active sludge suction activated sludge tank that is settled out is standby.Coagulating treatment reduces the suspension micelle surface potential in the waste water, by the mutual coagulation of dispersion state phase, catch the synergy coagulation by absorption of electric field bridge formation and net and precipitate, the pH value of waste water reduces to 3～4, and objectionable impurities clearances such as colourity, COD, BOC, sulfide reach more than 95%.(5) waste water and clear liquid that coagulating sedimentation is gone out is put into (utilizing the nature discrepancy in elevation to put into) redox pond and is carried out redox and handle.Lay in the pond waste iron filing (car bits, mill bits, shavings all can), the degree of depth that lays is lower than 0.3 meter in pond mouth, redox processing 48 hours.Add the processing of decolouring of 1 ‰ highly efficient composite coagulant for industrial wastewater treatment again, clear liquid is analysed the pond with pump suction alkali and is handled, and it is standby that throw out is sent into activated sludge tank.Through redox reaction, the pH value of waste water rises to 5～6.(6) carry out alkali and analyse processing.Alkali is analysed and is added alkaline agent (can gather materials on the spot, select lime, carbide slag or sodium hydroxid for use) in the pond, and add-on is pressed the pH value of waste water and determined that every raising pH value 1 adds lime 0.2kg/ rice ³Waste water makes the pH value of waste water reach 6～9 (must improve the pH value 1～2 of waste water).The limit adds that the alkaline agent limit is stirred, stirring velocity 8-12 is changeed minute.Then, natural sedimentation 6～8 hours, clear liquid is handled with the smart filter of the smart filter tower of pump suction, and it is standby that throw out is sent into activated sludge tank.(7) smart filter is handled, and removes remaining suspended substance.Be filled with quartz sand, lime carbonate, coking coal, charcoal from bottom to top in the smart filter tower.(8) magnetization is handled, and removes remaining iron ion and heavy metal ion.Magnetizing system is provided with the annular permanent magnet, and magnetic field is 12000 Gausses.Handle qualified discharge through magnetization.Each reaction tank internal surface uses glass reinforced plastic to build to strengthen resistance to acids and bases, takes out the Non-blinding pump that pump that waste water uses is all selected acid and alkali-resistance for use, and agitator is selected the stepless speed regulation agitator for use.

Claims (8)

1. Dinitrodiazophenol industrial wastewater treatment is characterized in that technological process is:

   (1), the acid waste water and the alkaline waste water that are produced in the production process are put into the neutralization reaction pond, store 3～5 days and carry out neutralization reaction;
2. (2), the waste water of neutralization reaction is emitted, the stepped appearance aerating apparatus of flowing through carries out natural aeration, exposure, flows into airtight anaerobic pond again, anaerobic treatment 5-10 days;
3. (3), the waste water after the anaerobic treatment is sent into the coupled reaction pond and active sludge carries out coupled reaction, active sludge is analysed process and is obtained by coagulating sedimentation, redox, alkali, its consumption is 10～20% of a processed wastewater volume, the limit edged stirs when adding active sludge, stirring velocity＜30 rev/min, after active sludge adds, continue slowly to stir one minute, natural sedimentation is 2～4 hours again, the mud that is settled out is after the pressure filter press filtration, mud cake is put the drying bed mummification into, and the plaster after the mummification is recycled behind 80～300 ℃ of dry thermal crackings;
4. (4), the waste water and clear liquid after the coupled reaction is sent into coagulative precipitation tank, the highly efficient composite coagulant for industrial wastewater treatment of adding 8～10 ‰, the limit edged stirs, stirring velocity＜30 rev/min, filling finishes and continues slowly to stir 2～3 minutes, natural sedimentation is 2～4 hours again, and the active sludge suction activated sludge tank that is settled out is standby;
5. (5), the waste water and clear liquid that coagulating sedimentation is gone out is sent into and is carried out the redox processing in the redox pond, lay iron filings, ferric oxide in the redox pond, the degree of depth that lays is lower than 0.2～0.3 meter of the processed water surface, the redox treatment time is 24～72 hours, Best Times 48 hours, clear liquid after the redox reaction is sent into alkali analyse the pond, high for chroma in waste water, after the highly efficient composite coagulant for industrial wastewater treatment of adding 0.8～1.2 ‰ decolours and handles, send into alkali again and analyse the pond, it is standby that throw out is sent into activated sludge tank;
6. (6), the waste water and clear liquid after redox handled sends into alkali and analyses and carry out alkali in the pond and analyse processing, adds alkaline agent, as: lime, carbide slag, sodium hydroxid, add-on press the pH value of waste water and are determined every raising pH value 1, adding lime 0.2～0.3kg/ rice ³Waste water makes the pH value of waste water reach 6～9,8～12 rev/mins of the stirring of limit edged, stirring velocitys, and natural sedimentation is 6-8 hours then, and it is standby that throw out is sent into activated sludge tank;
7. (7), with pump alkali is analysed the smart filter tower of clear liquid suction in the pond and carries out essence filter and handle, in the smart filter tower from following and be filled with quartz sand, lime carbonate, coking coal, charcoal;
8. (8), magnetization handles, the clear liquid that essence the leaches magnetizing system of flowing through is handled, and handles the back qualified discharge, magnetizing system is provided with the annular permanent magnet, magnetic field is 8000～15000 Gausses.