Method for treating high-concentration phenol-ammonia wastewater

A high-concentration, wastewater technology, applied in ammonia preparation/separation, chemical instruments and methods, water/sewage multi-stage treatment, etc. Treatment and other problems, to achieve the effect of reducing energy consumption and purification load, shortening the treatment process, and reducing treatment costs

Inactive Publication Date: 2014-01-08
HENAN DRAGON INTO COAL TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many existing high-concentration phenol ammonia wastewater processes, and the common outstanding shortcomings are: 1) The deacidification process is unreasonable, so that acid gases such as ionic carbon dioxide and hydrogen sulfide dissolved in the wastewater cannot be economically and effectively converted into free states, resulting in The residual amount of acid gas is too high; 2) The existing extraction agent is not efficient in removing polyphenols in wastewater, resulting in a high content of polyphenols in wastewater, which is difficult to meet the requirements of biochemical treatment; 3) Ammonia in wastewater When the content is high, the operation of the deamination tower is unstable. Due to the large amount of ammonia extraction and circulation, the tower pressure of the deamination tower is often unstable, and the ammonia content of purified water fluctuates greatly.
[0004] Due to the above problems, there is currently no mature, reliable, and stable process that enables the vast majority of coal chemical wastewater to meet the requirements of biochemical treatment continuously and stably after pretreatment, resulting in a large amount of coal chemical wastewater still exceeding the standard state of emission

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  • Method for treating high-concentration phenol-ammonia wastewater

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Experimental program
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Effect test

Embodiment 1

[0023] Applying the above-mentioned device for treating coal gasification wastewater containing phenol and ammonia, the total phenol content of coal gasification wastewater is 16798 mg / L, the free ammonia is 2018 mg / L, the fixed ammonia is 1864 mg / L, and the CO 2 2435 mg / L, pH value is 8.7, water temperature is 65°C, flow rate is 107 t / h, press figure 1 process shown. The phenol extraction tower 2 is a packed tower with a top temperature of 80°C, a top pressure of 0.3 MPa, a bottom temperature of 120°C, and a bottom pressure of 0.35 MPa. The deacidification and deamination tower 3 is a plate tower, the temperature at the top of the tower is 120°C, the pressure at the top of the tower is 0.32 MPa, the temperature at the bottom of the tower is 160°C, and the pressure at the bottom of the tower is 0.36 MPa. The output is 3653 kg / h. The operating pressure of the three-stage partial condenser is 0.51 MPa, and the operating temperature is 135.4°C; the operating pressure of the se...

Embodiment 2

[0025] Applying the above-mentioned device for treating coal gasification wastewater containing phenol and ammonia, the total phenol content of coal gasification wastewater is 5364 mg / L, the free ammonia is 1034 mg / L, the fixed ammonia is 1508 mg / L, and the CO 2 2352 mg / L, pH value is 7.8, water temperature is 72°C, flow rate is 94 t / h, according to figure 1process shown. The phenol extraction tower 2 is a packed tower with a top temperature of 78°C, a top pressure of 0.28 MPa, a bottom temperature of 119°C, and a bottom pressure of 0.32 MPa. The deacidification and deamination tower 3 is a plate tower, the temperature at the top of the tower is 117°C, the pressure at the top of the tower is 0.31 MPa, the temperature at the bottom of the tower is 155°C, and the pressure at the bottom of the tower is 0.34 MPa. The output is 3294 kg / h. The operating pressure of the three-stage partial condenser is 0.54 MPa, and the operating temperature is 133.7°C; the operating pressure of t...

Embodiment 3

[0027] Applying the above-mentioned device for treating coal gasification wastewater containing phenol and ammonia, the total phenol content of coal gasification wastewater is 4381 mg / L, the free ammonia is 1285 mg / L, the fixed ammonia is 1438 mg / L, and the CO 2 3452 mg / L, pH value is 7.2, water temperature is 75°C, flow rate is 116 t / h, press figure 1 process shown. The phenol extraction tower 2 is a packed tower with a top temperature of 82°C, a top pressure of 0.33 MPa, a bottom temperature of 127°C, and a bottom pressure of 0.35 MPa. The deacidification and deamination tower 3 is a plate tower, the temperature at the top of the tower is 118°C, the pressure at the top of the tower is 0.30 MPa, the temperature at the bottom of the tower is 166°C, the pressure at the bottom of the tower is 0.36 MPa, the gas output in the middle and upper part is 4176 kg / h, and the gas at the top of the tower is 4176 kg / h. The output is 2787 kg / h. The operating pressure of the three-stage p...

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Abstract

The invention relates to a method for treating high-concentration phenol-ammonia coal gasification wastewater. The method takes butyl acetate as an extraction agent and comprises the steps of firstly extracting by use of a phenol extraction tower to remove phenols contained in the wastewater, removing the acid gas and ammonia in the wastewater by use of an acid and ammonia removal tower, and recovering the extraction agent in the extraction phase by use of a solvent stripping tower so as to obtain a crude phenol product from the bottom of the tower. The method provided by the invention realizes high-purity removal of the phenols, acid gas, free ammonia and solid ammonia in the coal gasification wastewater so as to meet the requirement of biochemical treatment on the inflow water quality, and obtains the crude phenol product and high-concentration ammonia gas. Compared with the prior art, the method provided by the invention has the advantages of good extraction effect, high phenol removal efficiency, short process flow and low treatment cost; the method is simple and convenient to operate, and the treatment quality is reliable.

Description

technical field [0001] The invention relates to the technical field of high-concentration phenolic ammonia wastewater treatment, in particular to a method for treating high-concentration phenolic ammonia wastewater by first removing phenols, then deacidifying and deaminating, and using butyl acetate as an extraction agent. Background technique [0002] Coal gasification is an effective way to use coal cleanly and efficiently. It is widely used in coal gas, coal oil, coal power generation and other industries, but it also brings serious environmental pollution problems. Coal gasification, coal-to-liquids, and coal coking processes produce a large amount of highly polluted wastewater containing high concentrations of pollutants such as phenol, ammonia, and acid gas. For this kind of wastewater, a certain process must be adopted to remove most of the phenol, ammonia, and acid gas before entering the subsequent biochemical treatment. [0003] There are many existing high-concen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01C1/02C02F9/14C02F1/26C02F101/16C02F101/34C02F101/10
Inventor 白太宽王洪博周景龙杨孔林徐丹
Owner HENAN DRAGON INTO COAL TECH CO LTD
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