Waste water treating process of salt-containing propenoic acid and/or salt-containing propylene ester

A treatment method and wastewater treatment technology, which is applied in the direction of neutralization water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as unstable operation of biological treatment systems, and achieve reduced treatment cost, energy consumption reduction effect

Inactive Publication Date: 2008-12-31
北京中科国益环保工程有限公司
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Problems solved by technology

[0012] Due to the high composition of acrylic acid and its ester wastewater, it contains a large amount of SO 4 2- And formaldehyde and other substances that have a strong inhibitory and toxic effect on microbial growth, so the biological treatment system has the disadvantage of unstable operation, and it is necessary to add growth substrates to promote microbial growth, and add a large amount of lime to neutralize the pH of wastewater

Method used

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  • Waste water treating process of salt-containing propenoic acid and/or salt-containing propylene ester
  • Waste water treating process of salt-containing propenoic acid and/or salt-containing propylene ester
  • Waste water treating process of salt-containing propenoic acid and/or salt-containing propylene ester

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Embodiment

[0039] An example is given below for description, so that those skilled in the art can more clearly understand the technical features and effects of the present invention.

[0040] The waste water volume and water quality data that present embodiment adopts are as follows:

[0041]

[0042]

[0043] Note: waste water 1-acrylic acid waste water; waste water 2-acrylate waste water;

[0044] The specific indicators of wastewater are:

[0045] COD 40000mg / LSO 4 2- 3500mg / L

[0046] NO 3 - 1000mg / L salt content 20000mg / L

[0047] According to the requirements of the National Comprehensive Wastewater Discharge Standard (GB8978-1996), after wastewater treatment, it can achieve indicators that are superior to the existing first-level standards:

[0048] COD<40mg / L, pH 6-8.

[0049] Since the wastewater has a certain change in water quality and quantity, if it directly enters the biological treatment system, it will have a certain impact on the subsequent treatment syst...

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Abstract

A method for treating the wastewater bearing salt of acrylic acid and/or acrylic ester comprises the following steps: A, the wastewater bearing salt of acrylic acid and/or acrylic ester is filtered through a layer of iron filing for pretreatment, with the hydraulic retention time reaching 2.0-5.0 hours; B, alkali is added to the pretreated wastewater to enable the pH value to reach 8-9; C, then, anaerobic granular sludge is added for anaerobic biological treatment; D, aerobic biological treatment is followed; E, the wastewater is then precipitated to get suspended solids removed so as to enable the drainage to reach discharge standards; F, the sludge precipitated in the step E is returned to the step D to rejoin the aerobic biological treatment. The invention enables pretreatment for acrylic acid and acrylic ester wastewater with high salt content (especially with high content of SO42-), as well as formaldehyde and other substances poisoning micro-organisms, so as to reduce the poisoning effect to the follow-up treatment due to vast amount of SO42- and formaldehyde existing in the wastewater, so that the follow-up biological treatment can go on smoothly.

Description

technical field [0001] The invention relates to a method for treating organic chemical wastewater, in particular to a method for treating wastewater containing salt-containing acrylic acid and / or salt-containing propylene ester. Background technique [0002] At present, the main treatment methods for wastewater with high concentration of acrylic acid and its acrylic esters at home and abroad are incineration and catalytic wet oxidation. Although these two treatment methods have good treatment effects, their energy consumption is high. [0003] 1) Incineration method [0004] The acidic wastewater produced by the acrylic acid production unit and the alkaline wastewater produced by the acrylic ester production unit are stored separately, mixed in the neutralization tank after being preheated, and neutralized with sodium hydroxide, and the neutralized wastewater is heated and entered into the distillation tower for use The steam is heated and concentrated, and part of the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/66C02F3/28C02F3/02C02F1/52
CPCY02W10/10
Inventor 李开明李安学杨庆丰么士平车爱玮景永强
Owner 北京中科国益环保工程有限公司
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