CN109851179B - Acrolein production wastewater treatment process - Google Patents
Acrolein production wastewater treatment process Download PDFInfo
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- CN109851179B CN109851179B CN201910279905.XA CN201910279905A CN109851179B CN 109851179 B CN109851179 B CN 109851179B CN 201910279905 A CN201910279905 A CN 201910279905A CN 109851179 B CN109851179 B CN 109851179B
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Abstract
The invention discloses a treatment process of acrolein production wastewater, which is characterized by comprising the following steps: the method combines an improved Fenton deep oxidation method and an activated sludge method, wherein the control parameters of the improved Fenton deep oxidation include that the pH value of inlet water is 3.0-4.0, the flocculation pH value is the pH value after natural reaction and is 2.5-3.5, and the pH value of wastewater treated by the activated sludge method is adjusted to 6.5-7.5 after flocculation is completed. The invention adopts the improved Fenton reagent method to eliminate toxic and harmful pollutants, thereby meeting the conditions of the activated sludge method, and having small occupied area of the whole process, small one-time investment and low treatment cost.
Description
Technical Field
The invention relates to an industrial wastewater treatment process, in particular to a treatment process of acrolein production wastewater.
Background
In the acrolein production, propylene, air and steam (water) are respectively metered according to the process requirement proportion and enter a mixer, preheated and then enter an oxidation reactor, catalytic oxidation reaction is carried out at 300-400 ℃, cooled and then enter an acid washing tower, acrylic acid in reaction gas is washed by water and then enters an absorption tower, low-temperature cooling water is used for absorbing acrolein generated by the reaction, and excessive air and carbon oxides are discharged from the top of the absorption tower; preheating the acrolein water solution, then feeding the preheated acrolein water solution into an analytical tower for distillation, and collecting fractions at the temperature of 52-53 ℃ to obtain finished product acrolein. The waste water containing acrolein, acrylic acid and the like discharged by distillation is the waste water in the acrolein production.
The industrial treatment method of the acrolein wastewater mainly comprises the following three methods: activated sludge process, direct combustion process and wet oxidation process. Because the acrolein wastewater has complex composition, strong acidity and high organic matter content (COD is 10000 mg/L-40000 mg/L), the treatment is difficult.
Although the activated sludge process is a common process with the least investment and the most economical use, it has two fatal drawbacks in the treatment of acrolein wastewater: firstly, the waste water contains a large amount of toxic and harmful pollutants to microorganisms, so that the microorganisms cannot survive; secondly, the organic pollutants with high concentration cannot be accepted, and a large amount of water is needed to dilute the organic pollutants to proper concentration, so that the occupied area of the structure is very large.
The direct combustion method comprises the following steps: because the concentration of combustible substances in the acrolein wastewater is low, a large amount of fuel oil needs to be consumed, otherwise, the concentration pretreatment is needed. The main organic component of the acrolein wastewater is low-boiling-point substances, the concentration pretreatment is not easy to carry out, and the operation is difficult, so the cost is high.
Wet oxidation method: theoretically possible, and practically applicable, but the investment in one time is too large for acrolein waste water with water amount up to 600 t/d.
Therefore, the treatment process of the acrolein production wastewater, which has the advantages of small occupied area, small one-time investment and low treatment cost, is very necessary.
Disclosure of Invention
The invention aims to provide a treatment process of acrolein production wastewater, which does not need to dilute high-concentration organic pollutants, adopts an improved Fenton reagent method to eliminate toxic and harmful pollutants so as to meet the conditions of an activated sludge method, and has the advantages of small occupied area, low one-time investment and low treatment cost.
The technical scheme of the invention is as follows: a treatment process of acrolein production wastewater is characterized in that: the method combines an improved Fenton deep oxidation method and an activated sludge method, wherein the control parameters of the improved Fenton deep oxidation include that the pH of inlet water is 3.0-4.0, the flocculation pH is the pH after natural reaction and is 2.5-3.5, and the pH of wastewater treated by the activated sludge method is adjusted to 6.5-7.5 after flocculation is completed.
In the invention, alkali is added into the middle water tank before entering ESBG for treatment.
According to the invention, the pH of inlet water is changed from 2.5-3.5 to 3.0-4.0 by improving the control parameter of Fenton deep oxidation, the pH is not adjusted before flocculation, and the pH is directly 2.5-3.5 after natural reaction, so that organic iron Fe (C) plays a role in flocculationiOj)n(wherein i<5、j<10) And hydration products of ferric iron [ Fe (H)2O）n（OH）6-nWherein n =0, 1, 2, 3, 4, 5, 6, and adjusting the pH to 6.5 to 7.5 after completion of the flocculation.
The invention adopts the improved Fenton reagent method to eliminate toxic and harmful pollutants, thereby meeting the conditions of the activated sludge method, and having small occupied area of the whole process, small one-time investment and low treatment cost.
Drawings
FIG. 1 is a process flow diagram of a conventional Fenton deep oxidation + activated sludge process;
FIG. 2 is a process flow diagram of the present invention.
Detailed Description
The invention is illustrated in detail in the following by the examples and figures:
as can be seen from fig. 1 and 2, the process flow of the present invention is substantially the same as that of the conventional Fenton deep oxidation + activated sludge process, and the equipment used is the same, except for the control parameters of the Fenton deep oxidation.
The conventional Fenton deep oxidation and activated sludge method comprises the following process flows: adjusting the pH value of the wastewater from the adjusting tank to about 3.0 in a pre-acidification tank, adding ferrous iron and hydrogen peroxide in a certain proportion according to the total amount of the wastewater according to the COD concentration of the wastewater, reacting for a certain time (such as 2 hours), adding alkali in a PAM adding tank to adjust the pH value to 6.5-7.5, adding a PAM coagulant aid for flocculation and precipitation, and allowing the supernatant to enter a subsequent activated sludge section for biochemical treatment.
The process flow of the invention is as follows: adjusting the pH value of the wastewater from the adjusting tank to 3.0-4.0 in a pre-acidification tank, adding ferrous iron and hydrogen peroxide in a certain proportion according to the total amount of the wastewater according to the COD concentration of the wastewater, reacting for a certain time (such as 2 hours), adding a PAM coagulant aid in a flocculation tank under the condition of pH (generally 2.5-3.5) after natural reaction for flocculation, carrying out sludge-water separation in a sedimentation tank, adding alkali into a clear water tank to adjust the pH value to 6.5-7.5, and carrying out biochemical treatment in a subsequent activated sludge section.
The invention relates to a treatment process of acrolein production wastewater, which is characterized by comprising the following steps: the improved Fenton deep oxidation and activated sludge method is combined, the control parameters of the improved Fenton deep oxidation include that the pH of inlet water is 3.0-4.0, the flocculation pH is natural reaction pH and is 2.5-3.5, and the pH is adjusted to 6.5-7.5 after flocculation is finished.
According to the invention, the pH of inlet water is changed from 2.5-3.5 to 3.0-4.0 by improving the control parameter of Fenton deep oxidation, the pH is not adjusted before flocculation, and the pH is directly the pH of natural reaction of 2.5-3.5, so that organic iron Fe (C) plays a role in flocculationiOj)n(wherein i<5、j<10) And hydration products of ferric iron [ Fe (H)2O）n（OH）6-nWherein n =0, 1, 2, 3, 4, 5, 6, and adjusting the pH to 6.5 to 7.5 after completion of the flocculation.
The conventional Fenton deep oxidation and activated sludge method is adopted to treat acrolein production wastewater, the effluent color is reddish brown, the COD of the final effluent is seriously exceeded, the effluent is seriously polluted with mud, the anaerobic section of the biochemical unit basically has no effect, a large amount of reddish brown sludge exists at the bottom after the operation for a period of time, a large amount of bubbles are generated in the operation process of the aerobic part, activated sludge zoogloea is slightly dispersed into reddish brown, and SV30 is less than 10%; when the method is used for treating the acrolein production wastewater, the biochemical unit operates normally, the effluent reaches the standard, and the appearance is clear and transparent.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (2)
1. A treatment process of acrolein production wastewater is characterized in that: the organic COD of the acrolein production wastewater is 10000 mg/L-40000 mg/L, the treatment process combines an improved Fenton deep oxidation method and an activated sludge method, the control parameter of the improved Fenton deep oxidation is that the pH of inlet water is 3.0-4.0, the flocculation pH is the pH after natural reaction, namely2.5 to 3.5, the flocculation is organic acid iron Fe (C)iOj)nAnd the hydration product of ferric iron Fe (H)2O）n（OH）6-nWherein i is<5、j<10，Fe（H2O）n（OH）6-nWherein n =0, 1, 2, 3, 4, 5, 6; and after the flocculation is finished, adjusting the pH of the wastewater treated by the activated sludge method to 6.5-7.5.
2. The process for treating acrolein production wastewater according to claim 1, wherein: alkali is added into the intermediate water pool before entering the EGSB for treatment.
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