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Oil-containing water-enriched scum dehydration treatment method

A treatment method and technology for water scum, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of low degree of automation, poor fluidity of scum, and small amount of water released and other problems, to achieve the effect of high degree of automation, good flocculation effect and less addition amount

Active Publication Date: 2013-03-06
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 1. After the scum settles naturally, the separated water may contain a lot of scum and cannot directly enter the biochemical system for treatment
After the sewage returns to the main entrance, when the scum enters the flotation tank again, it is easy to settle at the bottom and is not easy to float, which affects the effect of sewage treatment
[0009] 2. The degree of automation is low, and it is difficult to accurately separate the scum
The settlement layer of the water in the scum is switched by empirical operation, and manual visual inspection is required to observe the well, which is labor-intensive and inefficient
[0010] 3. The amount of organic flocculant added is large, and the flocculation effect is poor
When the amount of organic flocculant added exceeds 300mg / L, the scum begins to flocculate, and the formed dendritic long-chain flocs occupy a large volume in the scum, the amount of water released is small, and the fluidity of the scum after dehydration is poor, and the organic flocculant The addition of , increases the difficulty of post-processing
[0011] 4. The scum tank uses ordinary storage tanks in structure, without mixing equipment, the flocculant and scum cannot be fully mixed

Method used

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  • Oil-containing water-enriched scum dehydration treatment method
  • Oil-containing water-enriched scum dehydration treatment method
  • Oil-containing water-enriched scum dehydration treatment method

Examples

Experimental program
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Effect test

example 1

[0046] Take 1 OL of scum from a sewage treatment plant in an oil refinery, the scum has a water content of 97%, put it into the first scum settling tank, add 20 mg / L flocculant polymerized ferric sulfate, stir and mix for 5 minutes, and settle for 72 hours. It will be divided into upper, middle and lower layers of liquid, of which the upper and lower layers are scum, and the middle part is water. After removing the scum at the bottom, cut 4L of water in the middle into the second scum settling tank, put 20mg / L flocculant polyferric sulfate into the second scum settling tank, heat to 60°C, stir and mix for 10min, settle for 72h, and drain There is a small amount of scum at the bottom, and 2.7L of clear water is obtained. The COD is 489mg / L after testing, fully meeting the requirements of biochemical treatment, and the dehydration rate is 27%.

example 2

[0048] In a refinery with a processing capacity of 3.5 million t / a, the sewage treatment plant produces 10,000 tons of scum with a water content of 96% every year. The factory has a delayed coking unit of 500,000 t / a, which consumes about 7,500 t / a of scum. There are four 500m3 scum tanks in the sewage treatment plant, which are divided into two groups of 2 tanks, which are called the first group of scum settling tanks and the second group of scum settling tanks according to their uses. One of the first group of scum settling tanks is filled with scum and then settled, and the other is used to collect scum from the scum tank, and recycling does not affect the normal operation of the device. The first group of settling tanks filled with scum, add 20mg / L flocculant polyferric sulfate, start the circulation pump, the material circulates internally for 30 minutes, after settling for 72 hours, open the middle and lower valves through the radar level gauge, and settle about 220m3 of ...

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Abstract

The invention relates to an oil-containing water-enriched scum dehydration treatment method, belonging to the field of wastewater treatment. The invention is characterized in that a primary and secondary scum settling tank systems are utilized to carry out two-stage flocculating settling dehydration treatment on the water-enriched scum, wherein the primary and secondary scum settling tanks are respectively provided with a radar liquidometer automatic water-discharge control system, a water outlet is additionally arranged every other 1-3 meters, and the primary and secondary scum settling tanks are respectively provided with a circulating pump and a flocculant measuring pump, thereby implementing internal circulation after injecting the flocculant; a heating coil is arranged in the secondary settling tank to control the temperature of the liquid in the tank at 50-90 DEG C; and 10-300mg of inorganic flocculant is added to every liter of liquid. The invention has the advantages of high dehydration efficiency and low flocculant consumption; the separated scum has favorable flowability, and thus, is convenient for pipeline transportation; and the separated water has low scum content, and thus, can directly enter the subsequent biochemical treatment system to be treated. The COD (chemical oxygen demand) of the treated wastewater is up to 200-800 mg / L.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a dehydration treatment method for oily water-rich scum. Background technique [0002] During the crude oil processing process in the refinery, a large amount of oily sewage will be generated. For the treatment of sewage, the preliminary oil-water separation is generally carried out first, and the oily sewage enters the oil separation tank of the sewage treatment plant to separate the dirty oil on the surface of the sewage, and the sewage after oil separation goes to the flotation tank, where it passes through The flocculant is flocculated, and then through the pressurized dissolved air flotation, the flocs are formed on the surface of the sewage, and the water-rich scum is formed after being separated by the scraper machine. [0003] Water-rich scum is generally composed of dirty oil, sediment, miscellaneous debris, inorganic flocculants, water, etc., and the water content ...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 常文之苟社全张红宇许金山刘爱华赵双霞崔云梓
Owner CHINA PETROLEUM & CHEM CORP
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