Treatment method of alkaline oily wastewater with demulsifier

A treatment method and demulsifier technology, applied in water/sewage multi-stage treatment, flotation water/sewage treatment, water/sludge/sewage treatment, etc., can solve secondary pollution and other problems, and achieve simple and strong dosing Effect of surface activity and low running cost

Inactive Publication Date: 2011-12-14
JIANGSU BESITE WATER SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN85107131 has introduced the demulsifier mainly used for processing oily sewage based on inorganic aluminum salt and iron salt. When using this kind of demulsifier to treat sewage, a large amount of scum is produced, which is easy to bring secondary pollution; for my country's current The use and research status of oily wastewater demulsifiers and the increasingly stringent environmental protection requirements, so it is necessary to find a more effective and lower cost method for the treatment of alkaline oily wastewater

Method used

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  • Treatment method of alkaline oily wastewater with demulsifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1, preparation of demulsifier: proportioning by weight percentage of the following raw materials:

[0027] Calcium chloride 0.05-0.5%, polyferric sulfate 0.1-1.5%, polyaluminum chloride 0.5-3.0%, cationic polyacrylamide 0.01-0.1%, and the rest is water. Slowly add the above raw materials in sequence under normal temperature and pressure, and evenly Stir and dissolve in water to prepare a demulsifier for ready-to-use liquid products;

[0028] Step 2. Primary demulsification: the wastewater to be treated enters the primary demulsification tank. The dosage of primary demulsifier is 0.5-3.0ml / L per liter of treated wastewater. The pH of the water quality is controlled between 7-11, and the water temperature is controlled At 10-65°C, and stirring at a stirring speed of 40-100rpm, the residence time of the primary demulsifier in the wastewater is controlled within 5-21min;

[0029] Step 3, first-level vortex air flotation: the mixed liquid after the above pretreatment e...

Embodiment 2

[0033] Step 1, prepare a demulsifier, take mass fraction of calcium chloride 0.20%, polyferric sulfate 1.25%, polyaluminum chloride 2.0%, cationic polyacrylamide 0.02%, and the rest is water; at normal temperature and pressure, dissolve in water in sequence spare;

[0034] Step 2. Primary demulsification: The dosage of primary demulsifier is 2.0ml / L per liter of treated wastewater, the pH of water quality is controlled to 8.5, the water temperature is controlled at 45°C, and the stirring speed is 50rpm. The primary demulsifier is added to the waste water The residence time is controlled at 10min;

[0035] Step 3, first-level vortex air flotation: same as step 3 in Example 1, the effluent water is analyzed with a sewage removal rate of 90%, and the effluent water is clear;

[0036] Step 4, preparing a secondary demulsifier, taking mass fractions of calcium chloride 0.10%, polyferric sulfate 0.55%, polyaluminum chloride 1.00%, cationic polyacrylamide 0.01%, and the rest is wate...

Embodiment 3

[0039] Step 1, prepare a demulsifier, take 0.10% of calcium chloride, 1.50% of polyferric sulfate, 1.70% of polyaluminum chloride, 0.01% of cationic polyacrylamide in mass fraction, and the rest is water; at normal temperature and pressure, dissolve in water in sequence spare;

[0040] Step 2. Primary demulsification: The dosage of primary demulsifier is 2.5ml / L per liter of treated wastewater, the pH of water quality is controlled to 7.5, the water temperature is controlled at 62°C, and the stirring speed is 40rpm. The primary demulsifier is added to the waste water The residence time is controlled at 15min;

[0041] Step 3, one-stage vortex-concave air flotation: same as step 3 in Example 1, the effluent is analyzed with a sewage removal rate of 88%;

[0042] Step 4, prepare the secondary demulsifier, take mass fraction of calcium chloride 0.15%, polyferric sulfate 0.35%, polyaluminum chloride 1.55%, cationic polyacrylamide 0.02%, and the rest is water, which is dissolved i...

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Abstract

The invention discloses a method for treating alkaline oily wastewater with a demulsifier, which adopts a secondary demulsification and two-stage air flotation treatment process. The main steps include: preparing a demulsifier, adding the demulsifier to a primary demulsification tank for Once fully stirred, through the first vortex air flotation treatment, the treated water enters the secondary demulsification tank for secondary demulsification, enters the air flotation tank for secondary dissolved air flotation treatment, and efficiently treats alkaline oily wastewater. The oil removal effect of the treatment method of the present invention can reach more than 95%; and the multifunctional agent of the present invention is low in price, easy to obtain on the market, easily soluble in water, simple to add, low in operating cost, obviously more stable in effect, and easy to use. practical use.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a method for separating alkaline oily wastewater by using a novel compound demulsifier. Background technique [0002] At present, there are many methods for the treatment of oily wastewater in domestic steelmaking, oil refining and other factories. Generally, heating and oil separation, air flotation, aerobic biochemistry, and post-flocculation are used for treatment; in the treatment of oily wastewater, demulsifiers are generally required to break the oily wastewater. In order to achieve the purpose of degreasing, there are many types of demulsifiers added in the prior art, and the effect is more obvious, but the requirements for the water quality of pretreatment are strict, the range of pH is small, and the dosage of chemicals is large. There are also many inconveniences, and the treatment effect cannot reach the expected result, and the medicament has n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F1/52C02F1/24
Inventor 张鸣球王长昊刘金成
Owner JIANGSU BESITE WATER SCI & TECH
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