Acrylonitrile-containing fermentation wastewater treatment process

A technology for fermented wastewater and treatment process, which is applied in multi-stage water treatment, water/sewage treatment, water treatment parameter control, etc. It can solve the problems of low aerobic biochemical efficiency and difficult treatment of fermented wastewater, and achieve the goal of avoiding biochemical efficiency Impact, efficient operation, high processing efficiency

Inactive Publication Date: 2019-08-27
NANJING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems of high difficulty in treating acrylonitrile-containing fermentation wastewater and low subsequent aerobic biochemical efficiency, the present invention provides a two-stage hydrolytic acidification-anaerobic treatment method for treating acrylonitrile-containing fermentation wastewater, which can overcome the problems in wastewater The presence of acrylonitrile affects the treatment of high-concentration complex organic matter, and the treatment efficiency is high

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  • Acrylonitrile-containing fermentation wastewater treatment process
  • Acrylonitrile-containing fermentation wastewater treatment process
  • Acrylonitrile-containing fermentation wastewater treatment process

Examples

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Embodiment 1

[0034] The water quality indicators of the wastewater in this embodiment are as follows: the COD concentration in the wastewater is 5000 mg / L, the ammonia nitrogen concentration is 300 mg / L, the total phosphorus concentration is 35 mg / L, the acrylonitrile concentration is 2000 mg / L, and the pH value is about 7. figure 1 Be the flow chart of process of the present invention, as figure 1 As shown, the specific processing steps are as follows:

[0035] 1) First, add the wastewater to calcium hydroxide solution for coagulation and precipitation, the suspended solids are reduced to 250mg / L, and the COD is reduced to 2000mg / L. The ORP of the reactor is 30mv; the hydraulic retention time is controlled at 8h.

[0036] 2) Treat the wastewater treated in step 1) in an anaerobic reactor, control the ORP of the reactor in the treatment stage to be -100mv, and control the hydraulic retention time to 16h.

[0037]3) The waste water treated in step 2) is treated in a two-phase anaerobic re...

Embodiment 2

[0043] The wastewater quality indicators of this embodiment are as follows. The COD concentration in the wastewater is 4000 mg / L, the ammonia nitrogen concentration is 240 mg / L, the total phosphorus concentration is 30 mg / L, the acrylonitrile concentration is 1600 mg / L, and the pH value is about 7.

[0044] The specific steps of the treatment process of this wastewater in the present embodiment are as follows:

[0045] 1) First, add ferrous sulfate to the wastewater for coagulation and precipitation, reduce the concentration of suspended solids to 200mg / L, and reduce the concentration of COD to 1500mg / L, export the supernatant after coagulation and precipitation for hydrolysis and acidification treatment, and control the hydrolysis in the treatment stage The ORP of the acidification reactor is 50mv, and the hydraulic retention time is controlled at 4h.

[0046] 2) Treating the wastewater treated in step 1) in an anaerobic reactor, controlling the ORP of the reactor in the trea...

Embodiment 3

[0052] The wastewater quality indicators of this embodiment are as follows. The COD concentration in the wastewater is 4500 mg / L, the ammonia nitrogen concentration is 250 mg / L, the total phosphorus concentration is 25 mg / L, the acrylonitrile concentration is 1700 mg / L, and the pH value is about 7.

[0053] The specific steps of the treatment process of this wastewater in the present embodiment are as follows:

[0054] 1) First, add polyferron to the wastewater for coagulation and precipitation, the concentration of suspended solids is reduced to 180mg / L, and the concentration of COD is reduced to 1700mg / L, and the supernatant after coagulation and precipitation is exported for hydrolysis and acidification treatment, and the hydrolysis and acidification in the treatment stage is controlled The ORP of the reactor is -50mv; the hydraulic retention time is controlled at 5h.

[0055] 2) Treat the wastewater treated in step 1) in an anaerobic reactor, control the ORP of the reactor...

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Abstract

The invention discloses an acrylonitrile-containing fermentation wastewater treatment process and belongs to the field of wastewater treatment. The process comprises the following steps: 1) firstly, carrying out hydrolytic acidification treatment on wastewater; 2) carrying out anaerobic reaction treatment on the wastewater treated in the step 1); 3) sequentially carrying out hydrolytic acidification and anaerobic reaction treatment on the wastewater treated in the step 2); and 4) carrying out aerobiotic biochemical treatment on the wastewater treated in the step 3). In the step 3), a two-phaseanaerobic reactor is adopted for treatment, and a hydrolytic acidification reactor and an anaerobic reactor are serially connected by using the two-phase anaerobic reactor. According to the process,a two-stage hydrolytic acidification-anaerobic treatment method is adopted to treat acrylonitrile-containing fermentation wastewater, influence of acrylonitrile in the wastewater upon treatment of high-concentration complex organic matters is avoided, the treatment efficiency is high, and up-to-standard emission of treated wastewater is met.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and more specifically relates to a process for treating fermented waste water containing acrylonitrile. Background technique [0002] Acrylonitrile is a polar organic compound that is easily soluble in water. When the concentration in water is higher than 400mg / L, it can significantly inhibit the metabolism of microorganisms; when the concentration is between 50 and 400mg / L, the inhibitory effect is relatively weak , can be slowly degraded by microorganisms in the form of co-metabolism; when the concentration is 20-50 mg / L, it can effectively degrade acrylonitrile pollutants in wastewater by domesticating anaerobic or aerobic microorganisms. Acrylonitrile is a colorless, bitter almond-like highly toxic organic cyanide with high toxicity and potential genotoxicity. It is one of the important harmful pollutants in the environment. It not only destroys the water ecosystem, but also endangers hum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F9/14C02F101/38
CPCC02F1/5245C02F3/30C02F2101/38C02F2209/04C02F2209/08C02F2209/10C02F2209/14C02F2209/44C02F2301/08
Inventor 张炜铭吕路汪林花铭潘丙才
Owner NANJING UNIV
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