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ABS sewage treating method

A sewage and mechanical stirring technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as sewage ABS sewage treatment methods that are not specified, and improve reliability Biochemical properties, simple process, and easy-to-operate effects

Inactive Publication Date: 2003-05-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But what this invention discloses is only a kind of flocculant, and does not specify the method that adopts this method to treat sewage, especially ABS sewage

Method used

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  • ABS sewage treating method

Examples

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Embodiment 1

[0024] Get 6L of ABS sewage, adjust the pH value of ABS sewage to 6.8 by sulfuric acid, the addition of basic polyaluminum chloride is 15ml (4%), the stirring speed is 260r / min, and the addition of polyacrylamide is 1.9ml ( 1%), the stirring speed is 80r / min, and the clarification and separation time is 40 minutes. The whole process is carried out at a temperature of about 32°C and normal pressure. The SS content before and after sewage treatment and the SS removal rate after treatment are shown in Table 1.

Embodiment 2

[0026] Take 6.5L of ABS sewage, adjust the pH value of ABS sewage from 9.2 to 7.1 with hydrochloric acid, the addition of basic polyaluminum chloride is 14ml (4%), the stirring speed is 280r / min, and the addition of polyacrylamide is 1.7ml (1%), the stirring speed is 100r / min, and the clarification and separation time is 1 hour, and the treatment process is carried out at a temperature of about 28°C under normal pressure. The SS content and SS removal rate after treatment of ABS sewage before and after treatment are shown in Table 1.

Embodiment 3

[0028] Get 6L of ABS sewage, adjust the pH value of ABS sewage from 8.4 to 7.6 with nitric acid, the addition of basic polyaluminum chloride is 24ml (2.4%), the stirring speed is 270r / min, and the addition of polyacrylamide is 1.5ml ( 1%), the stirring speed is 90r / min, the clarification and separation time is 1.5 hours, and the treatment process is carried out at a temperature of about 30°C under normal pressure. The SS content and SS removal rate after treatment of ABS sewage before and after treatment are shown in Table 1.

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Abstract

The ABS sewage treating process includes the steps of: adding inorganic acid to regulate pH of sewage from ABS production to 6-8 while stirring; adding polyaluminum chloride in the amount of 50-200 ppm of ABS sewage while stirring; adding polyacrylamide in the amount of 1.7-6.7 ppm of ABS sewage while stirring; still standing to form water phase and settlings phase, and exhausting the water phaseto subsequent sewage treating field; and solid-liquid separation of the settlings with the liquid being returned to pH regulating step and the solid matter being recovered. The twice flocculation andsettlement separating process can eliminate SS content in ABS sewage and makes ABS sewage capable of being treated biochemically.

Description

technical field [0001] The invention relates to a method for treating ABS sewage, in particular to a method for pretreating ABS sewage, which belongs to the method for flocculating and precipitating suspended impurities in sewage. Background technique [0002] In the production process of sodium dodecylbenzenesulfonate, that is ABS, a large amount of industrial sewage is produced, which contains high suspended solids (SS). The SS content is generally 1000-3000mg / L, and the highest can reach 8000gm / L L. If it is directly discharged to the sewage field, it will bring difficulties to the subsequent sewage treatment, so pretreatment is required. Since ABS sewage is mostly emulsified wastewater, and the water quality is complex, the wastewater contains nitrile compounds, styrene-butadiene latex, AS low-molecular resin, ABS powder, ABS latex and other substances, and it is difficult to treat. In the prior art, the coagulation-air flotation method is often used for pretreatment o...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F9/04C02F9/14
Inventor 李向富祖春兴姚存良汪涵赵霞张春燕张恕
Owner PETROCHINA CO LTD
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