Method for treating naphthenic acid sewage by flocculation-electricity heterogeneous catalysis

A heterogeneous catalysis, naphthenic acid technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. , the effect is not ideal and other problems, to achieve the effect of low operating cost, easy operation and simple dosing

Inactive Publication Date: 2005-07-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] When air flotation-flocculation or electro-heterogeneous catalysis technology is used alone to treat naphthenic acid wastewater, either the effect is not ideal, and the treated wastewater does not meet the national discharge standards; or the cost is too high to be suitable for large-scale application

Method used

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  • Method for treating naphthenic acid sewage by flocculation-electricity heterogeneous catalysis
  • Method for treating naphthenic acid sewage by flocculation-electricity heterogeneous catalysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Effect of Polyaluminum Chloride on Naphthenic Acid Wastewater Treatment I

[0027] Treatment of naphthenic acid wastewater with polyaluminum chloride and anionic polyacrylamide. COD Cr The water quality chemical oxygen demand was determined by the dichromate method (GB11914-89) for analysis, the same below.

[0028] Raw water COD Cr : 1952.6mg / L, pH: 6, the flocculation results are shown in Table 1.

[0029] aggregation

[0030] * The molecular weight of the coagulant used is above 14 million

Embodiment 2

[0032] Effect of Polyaluminum Chloride on Naphthenic Acid Wastewater Treatment II

[0033] Treatment of naphthenic acid wastewater with polyaluminum chloride and cationic polyacrylamide.

[0034] Raw water COD Cr : 1952.6mg / L, pH: 6, the experimental results are shown in Table 2.

[0035] aggregation

[0036] * The molecular weight of the coagulant used is about 5 million

Embodiment 3

[0038] Effect of Polymerized Ferric Sulfate on Naphthenic Acid Wastewater Treatment I

[0039] Naphthenic acid wastewater was treated with polyferric sulfate and anionic polyacrylamide.

[0040] Raw water COD Cr : 1860.1mg / L, pH: 6, the reaction results are shown in Table 3.

[0041] aggregation

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Abstract

A flocculation-electroheterogeneous catalysis method for treating naphthenic acid wastewater. First, air flotation-flocculation treatment is carried out on naphthenic acid wastewater, the pressure is 0.2-0.4MPa, and the dosage of the agent is 0.01-0.07% of the wastewater volume; after the flocculation treatment, the DC voltage between the electrodes in the electric field is 5-15V, and the current Under an external electric field of 200-400 mA per square decimeter, the organic pollutants in the naphthenic acid wastewater are catalyzed and oxidized on the surface of the catalyst. The experimental results show that the combined technology can be used to treat naphthenic acid wastewater, which can be directly discharged up to the standard, and the operating cost is low.

Description

technical field [0001] The invention relates to industrial wastewater treatment, in particular to a method for treating naphthenic acid wastewater by flocculation-electric heterogeneous catalysis. Background technique [0002] Naphthenic acid is a by-product of petroleum processing. As an important chemical raw material, it is widely used in many fields such as coatings, additives, and preservatives. [0003] Because naphthenic acid is a strong emulsifier, it will cause a large amount of foaming on the surface of the biochemical tank in the biochemical tank, and the activated sludge will turn up and die, which will seriously impact the biochemical operation and make it difficult to carry out the biochemical treatment effectively. [0004] Someone once proposed to use centrifugal extraction pretreatment method to treat naphthenic acid wastewater (Petrochemical Environmental Protection, Phase II in 1989), but due to problems such as large amount of entrainment during extractio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F9/06
Inventor 杨旭于永辉孙承林杜远华蔡钊荣
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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