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A method for strengthening the hydrolysis and acidification of chemical wastewater

A technology for hydrolysis and acidification of chemical wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficult survival of microorganisms, low efficiency of hydrolysis and acidification, long residence time, etc. , to achieve the effect of being beneficial to hydrolysis and acidification, shortening the residence time, and reducing the amount of alkali addition

Inactive Publication Date: 2017-06-06
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the single hydrolysis and acidification method for the pretreatment of chemical wastewater that is difficult to biodegrade can only improve the biodegradability of wastewater to a limited extent, especially for highly toxic wastewater, where microorganisms are not easy to survive, the time for film formation is long, the efficiency of hydrolysis and acidification is low, and the residence time is long.

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  • A method for strengthening the hydrolysis and acidification of chemical wastewater

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Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 As shown, a method for strengthening the hydrolysis and acidification of chemical wastewater, the specific steps are:

[0038] ①Take 30L of ion exchange resin wastewater (COD is 8067mg / L, B / C is 0.15, pH=8.78) into the adjustment tank, the wastewater pH=8.78 is within the range of 4.5-9.5, no need to adjust the pH, directly inject the hydrolytic acidification bacteria (taken from the secondary sedimentation tank of urban sewage treatment plant) and the enhanced hydrolytic acidification reactor of multi-metal catalytic contact packing, the reinforced hydrolytic acidification packing bag 15kg in the reactor, the hydrolytic acidification bacteria 100g (dry weight) in the reactor, add 30mL H 2 o 2 (30%) solution, add sodium persulfate 5g, under the condition of slight aeration (0.5mg / L) and stirring (250rpm), carry out strengthening hydrolysis acidification reaction, reaction is carried out at 25 ℃.

[0039] ②After 6 hours of first-level enhanced hydrolys...

Embodiment 2

[0044] Such as figure 1 As shown, a method for strengthening the hydrolysis and acidification of chemical wastewater, the specific steps are:

[0045] ①Take 30L of wastewater from a pesticide factory (COD is 15670mg / L, B / C is 0.15, pH is 8.9) into the adjustment tank, the pH of the wastewater is 8.9 within the range of 4.5-9.5, no need to adjust the pH, and it is directly injected with hydrolytic acidification Bacteria (taken from the secondary sedimentation tank of urban sewage treatment plant) and multi-metal catalytic contact packing in the enhanced hydrolytic acidification reactor, the hydrolytic acidification bacteria in the reactor are 100g (dry weight), the enhanced micro-electrolysis filler pack in the reactor is 15kg, and 30mL h 2 o 2 (30%) solution, add sodium persulfate 8g, under the condition of slight aeration (0.8mg / L) and stirring (250rpm), carry out strengthening hydrolysis acidification reaction, reaction is carried out at 25 ℃.

[0046] ②The primary enhanc...

Embodiment 3

[0051] Such as figure 1 As shown, a method for strengthening the hydrolysis and acidification of chemical wastewater, the specific steps are:

[0052] ①Take 30L of wastewater from a printing and dyeing factory (COD is 8560mg / L, B / C is 0.18, pH is 12.75) into the regulating tank, the wastewater pH=12.75 is not within the range of 4.5-9.5, and the concentration is 4mol / l of H 2 SO 4 Adjust the pH to 8.15, and inject the wastewater into the enhanced hydrolytic acidification reactor containing hydrolytic acidification bacteria (taken from the secondary sedimentation tank of the urban sewage treatment plant) and multi-metal catalytic contact packing after adjustment. Endohydrolytic acidification bacteria 100g (dry weight), add 30mL H 2 o 2 (30%) solution, (without adding persulfate), under the conditions of micro-aeration (0.8mg / L) and stirring (250rpm), the enhanced hydrolysis acidification reaction was carried out at 25°C.

[0053] ② First-level enhanced hydrolysis and acidif...

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Abstract

The invention provides a method for strengthened hydrolytic acidification of chemical industry wastewater. The method is characterized by comprising the following steps: (1) detecting the pH value of the chemical industry wastewater, directly going to the next step if the pH value is 4.5-9.5, and adjusting the pH value to 4.5-9.5 if the pH value is not 4.5-9.5; (2) injecting the chemical industry wastewater into a strengthened hydrolytic acidification reactor containing hydrolytic acidification bacteria and polymetal catalytic contact filler, and carrying out strengthened hydrolytic acidification reaction under the conditions of aerating and stirring; and (3) after the reaction ends, adding a flocculant for flocculating settling for obtaining supernatant, detecting a B / C value, returning to the step (2) if the B / C value does not reach the standards, and going to subsequent aerobic biochemical reaction after the B / C value reaches the standards. According to the method provided by the invention, a strengthened hydrolytic acidification filler bag is added into the traditional hydrolytic acidification system and can carry out micro-electrolysis under acidic conditions, so that the removal of difficultly-degradable substances is facilitated, hydrolytic acidification is facilitated, the B / C value of yielding water can reach 0.3-0.6, and the removal ratio of COD (Chemical Oxygen Demand) can reach over 35%.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for improving the biodegradability of high-concentration refractory biodegradable chemical wastewater by strengthening hydrolysis and acidification. Background technique [0002] With the rapid development of my country's industry, more and more wastewater is discharged, and the pollution of the water environment is becoming more and more serious; especially the wastewater from the pesticide, metallurgy, electroplating and printing and dyeing industries, the wastewater is difficult to biodegrade, low in biodegradability, Due to the characteristics of high toxicity and high salt content, the direct discharge of this wastewater will cause great damage to the water environment. Hydrolytic acidification is an important detoxification pretreatment stage in the biochemical treatment of industrial wastewater, which determines the efficiency of subseq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 李响薛顺利张文娟陈红薛罡韩闯刘亚男高品
Owner DONGHUA UNIV
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