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Method for reducing COD (chemical oxygen demand) of permanent violet process wastewater and application of method

A permanent violet and waste water technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of high total nitrogen concentration and poor biodegradability, improve treatment efficiency, save usage, The effect of improving biodegradability

Active Publication Date: 2017-02-22
江苏南大华兴环保科技股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of high COD, total nitrogen concentration, poor biodegradability and the like in the existing permanent violet production wastewater, and the recyclable material triethylamine exists in the wastewater, the present invention provides a method for reducing the COD of the permanent violet process wastewater and Its application, through water quality classification collection, quality separation treatment, adopts a series of treatment methods such as coagulation sedimentation, alkali hydrolysis blow-off, recovery of triethylamine, etc. to remove anionic surfactants, total nitrogen, triethylamine and other substances, and at the same time recover three Ethylamine is reused in the production process; the iron-carbon micro-electrolysis-Fenton oxidation-neutralization precipitation process is carried out at the back end to strengthen wastewater treatment, further reducing the COD concentration and biological toxicity of wastewater, and improving the biodegradability of wastewater

Method used

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  • Method for reducing COD (chemical oxygen demand) of permanent violet process wastewater and application of method
  • Method for reducing COD (chemical oxygen demand) of permanent violet process wastewater and application of method
  • Method for reducing COD (chemical oxygen demand) of permanent violet process wastewater and application of method

Examples

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Embodiment 1

[0041] The comprehensive wastewater quality parameters of a process wastewater producing permanent violet in Yinchuan are as follows: CODcr 4392mg / L, anionic surfactant 202mg / L, total nitrogen 1514mg / L, triethylamine 841mg / L, combined with figure 1 , the present embodiment proposes a method for reducing the COD of permanent violet wastewater, the steps are as follows:

[0042] A. The workshop nitrification and washing wastewater is discharged to the collection pool 1 after secondary sedimentation, and the pH of the nitrification and washing wastewater is adjusted to 12 with an emulsion with a mass fraction of 25% calcium oxide, and 700mg / L of aluminum sulfate is added, and 5mg / L of PAM, after static precipitation in the coagulation sedimentation tank, the supernatant enters the subsequent pH adjustment tank; the COD of the nitrification washing wastewater is reduced from 4800mg / L to 2780mg / L, and the anionic surfactant is reduced from 802mg / L to 371mg / L. Concentration 6645mg / L...

Embodiment 2

[0052] In order to ensure that the permanent violet wastewater produced by a chemical company in Lianyungang, Jiangsu Province meets the requirements of biochemical influent water, and further ensure that the wastewater discharge meets the takeover standard, this example proposes a method for reducing the COD of the permanent violet wastewater. The steps are the same as in Example 1. Among them, in step A, the pH of nitrification and washing wastewater is adjusted to 11 with an emulsion of 33% calcium hydroxide calcium, and 250 mg / L PAC and 2.5 mg / L PAM are added for flocculation and precipitation; in step B, the wastewater is first concentrated and then added The caustic soda adjusts the pH to 13, distills and recovers triethylamine at a constant temperature of 88°C, concentrates the effluent and stratified water into the pH adjustment pool; step C will distill the mother liquor to recover the stratified wastewater produced by the solvent o-dichlorobenzene, Adjust the pH of th...

Embodiment 3

[0057] In order to ensure that the permanent violet wastewater produced by a chemical company in Binhai, Jiangsu meets the biochemical influent requirements, and further ensures that the wastewater discharge meets the takeover standard, this example proposes a method for reducing the COD of the permanent violet wastewater. The steps are the same as in Example 1. Among them, in step A, adjust the pH of nitrification and washing wastewater to 11.5 with an emulsion with a mass fraction of 30% calcium oxide, and add 500 mg / LPAS and 3 mg / L PAM for flocculation and precipitation; in step B, the finished product containing triethylamine is pulled apart The washing wastewater is distilled at a constant temperature of 90°C to adjust the pH to 12 with lye to recover triethylamine; in step C, the stratified wastewater produced by distilling and recovering the solvent o-dichlorobenzene from the mother liquor is distilled with the concentrated lye obtained by drying the triethylamine. The p...

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Abstract

The invention discloses a method for reducing COD (chemical oxygen demand) of permanent violet process wastewater and an application of the method and belongs to the technical field of pigment wastewater treatment. The method comprises the following steps: firstly, process wastewater is collected and treated in a classified manner according to specific pollutants of the wastewater: a nekal-bx-containing nitride washing wastewater is subjected to alkali regulating treatment, a flocculating agent is added for coagulating sedimentation, and an anionic surfactant is removed; layered wastewater produced through solvent o-dichlorobenzene recovery is subjected to alkaline hydrolysis and stripping; high-concentration wastewater containing triethylamine hydrochloride at a front section is separated from finished washing wastewater and subjected to alkali regulation and distillation, and triethylamine is recovered; secondly, the three parts of treated wastewater are mixed with other acidic wastewater for iron-carbon micro-electrolysis and Fenton oxidation coupled reinforced treatment. Classified collection and quality-divided treatment are performed according to features of the wastewater pollutants, the treatment process is safe and environment-friendly, wastewater treatment is targeted, refractory organics are removed to a greater extent, and the COD and total nitrogen content of the wastewater are reduced.

Description

technical field [0001] The invention belongs to the technical field of pigment wastewater treatment, and more specifically relates to a method for reducing COD of permanent violet process wastewater and its application. Background technique [0002] Permanent Violet RL is a high-grade organic pigment of the dioxazine class. It has outstanding coloring strength and brightness, excellent heat resistance, permeation resistance and good light fastness. Its properties are very good. Its use It is widely used in various coatings, plastics, plexiglass, rubber, textile printing, water-based ink, packaging printing and other fields. It is also suitable for offset printing, gravure printing and flexo printing. [0003] The current process of permanent violet mainly uses carbazole as the starting material, and is prepared through a series of reaction steps such as alkylation, nitration, hydrogenation reduction, and condensation ring closure. The nitration process is mainly that N-ethy...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F1/04C02F1/20C02F1/461C02F1/46176C02F1/52C02F1/5245C02F1/66C02F1/722C02F9/00C02F2001/007C02F2101/308C02F2305/026
Inventor 戴建军赵选英杨峰
Owner 江苏南大华兴环保科技股份公司
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