Wastewater deep processing method

A technology for advanced treatment and wastewater treatment, applied in the directions of oxidized water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. and other problems, to achieve the effect of simple process flow, realization of reuse, and enhancement of oxidation reaction effect.

Active Publication Date: 2014-11-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Long-term biochemical treatment causes most of the pollutants in wastewater to be refractory substances, which are highly toxic to microorganisms and have poor biodegradability
[0006] Chinese patent 200610096359.9 discloses a microbial advanced treatment method for oil refinery wastewater, which still uses the traditional biological treatment process to treat oil refinery wastewater. After more than a week, the wastewater after treatment is no longer biodegradable, and it is obviously unfeasible to use biotechnology to treat it

Method used

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  • Wastewater deep processing method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The tertiary biochemical effluent of a refinery sewage field, the wastewater quality characteristics are COD 78mg / L, conductivity 2016μS / cm, oil 1.64mg / L, turbidity 5.71NTU, BOD 5 0mg / L, total alkalinity 98.1mg / L. The waste water is treated as follows, see figure 1 :

[0039] Step 1. The waste water from the monitoring pool is pumped into the fiber filter through the sewage pump. The filter medium in the filter is bundled fiber, which is filtered downward with a filtration rate of 30m / h. The regular backwashing cycle is 6 times / week, and the backwashing time is 30 minutes. Soaking and backwashing with alkali is carried out every two months. The alkali is 96% solid alkali and soaked for 24 hours. Under these operating conditions, the effluent of the fiber filter has an oil content of 0.9mg / L, a turbidity of 1.67NTU, and no change in COD and conductivity;

[0040] Step 2: The effluent from the fiber filter enters the high-efficiency catalytic oxidation reactor, and t...

Embodiment 2

[0045]The secondary biochemical effluent of a refinery sewage field, the wastewater quality characteristics are COD90mg / L, conductivity 2800μS / cm, oil 5.2mg / L, turbidity 6.5NTU, BOD 5 0mg / L, total alkalinity 140mg / L. The waste water is treated as follows:

[0046] Step 1: The waste water is pumped into the fiber filter, and the filter medium in the filter is bundled fiber, which is filtered downward with a filtration rate of 25m / h. The regular backwashing cycle is 6 times / week, and the backwashing time is 30 minutes. Soaking and backwashing with alkali is carried out every two months. The alkali is 96% solid alkali and soaked for 30 hours. Under these operating conditions, the water and oil produced are 0.5mg / L, the turbidity is 2.0NTU, and the COD and conductivity remain unchanged;

[0047] In step 2, the water filtered by the fiber enters the high-efficiency catalytic oxidation reactor, and the reactor is filled with a honeycomb water treatment catalyst. The catalyst is...

Embodiment 3

[0051] A refinery uses membrane technology to treat concentrated water from wastewater. The concentrated water has a COD of 100mg / L, an oil content of 5mg / L, and a conductivity of 5000μS / cm. Oil 1.64mg / L, turbidity 5.71NTU, BOD 5 0mg / L, total alkalinity 98.1mg / L. The waste water is treated as follows:

[0052] Step 1: The waste water is poured into the fiber filter through the sewage pump, and the filter medium in the filter is bundled fiber, which is filtered downward with a filtration rate of 40m / h. The regular backwashing cycle is 6 times / week, and the backwashing time is 30 minutes. Soaking and backwashing with alkali is carried out every two months. The alkali is 96% solid alkali and soaked for 36 hours. Under these operating conditions, the effluent of the fiber filter has an oil content of 0.9mg / L, a turbidity of 1.67NTU, and no change in COD and conductivity;

[0053] Step 2: The effluent from the fiber filter enters the high-efficiency catalytic oxidation reactor...

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Abstract

The invention relates to an industrial reverse osmosis membrane device pollutant online extraction and analysis method. The invention belongs to the field of membrane-method sewage deep processing and recycling method. The method comprises the steps that: a commercial reverse osmosis membrane is used for manufacturing a lateral line membrane assembly which serves as a key pollutant extraction carrier; the lateral line membrane assembly is connected in parallel into an industrial reverse osmosis membrane device; lateral line membrane assembly water-access valve opening degree is adjusted, such that inlet water membrane-surface flow velocity is controlled; during an operation process, lateral line membrane assembly water production variation is recorded with timed frequency; when water production is reduced by 50-95% relative to an initial water production, the polluted reverse osmosis membrane reaches an analysis requirement; the polluted reverse osmosis membrane is fetched and is subjected to pollutant observation and analysis; acid and alkali are respectively used for soaking and washing the polluted reverse osmosis membrane; and contents of specific pollutants in the washing liquid are detected. The method provided by the invention has high practicality. With the method, original industrial membrane assembly and operation conditions are not damaged, and reverse osmosis membrane pollution cause can be rapidly searched. Therefore, a good technical prospect is provided for long-term stable operation of actual industrial membrane devices.

Description

technical field [0001] The invention relates to a treatment method for industrial wastewater, in particular to an advanced treatment method for the wastewater produced by oil refinery production after two or more biochemical treatments. Background technique [0002] Petrochemical is a large industrial water user in my country, and its water intake accounts for about 5% of the total industrial water intake in the country. It is one of the five major water-consuming and key water-saving industries recognized by the state. Therefore, significantly reducing the total amount of water intake and sewage discharge of Sinopec refining and chemical enterprises can not only effectively solve the problems of water resource shortage and environmental protection capacity constraints in Sinopec's "Eleventh Five-Year Plan" development, but also create better economic and social benefits for the enterprise and environmental benefits. [0003] The advanced treatment and reuse of sewage is on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/469C02F1/72C02F1/78
Inventor 龚小芝赵辉刘正童健崑
Owner CHINA PETROLEUM & CHEM CORP
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