Method for treating and recycling wastewater produced by coal middle-low temperature dry distillation

A wastewater, low temperature technology, applied in multi-stage water treatment, water/sewage treatment, natural water treatment and other directions, can solve the problems of low extraction and dephenolization efficiency, no measures to improve the biochemical properties of wastewater, and high gas-liquid ratio, and achieve guaranteed removal. effect and stability, improving the biodegradability of wastewater, and reducing the load of the biochemical system

Inactive Publication Date: 2018-03-02
BEIJING CYCLE COLUMBUS ENVIRONMENTAL TECH RES INST CO LTD
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  • Application Information

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Problems solved by technology

[0003] Patent CN104926029 discloses a semi-coke wastewater treatment method, the method includes: coarse filtration, acid precipitation, phenol recovery, ammonia recovery, desulfurization, oxidation, aerobic treatment, anaerobic treatment, secondary aerobic treatment, electrolysis, MBR Or biological aerated filter, desalination and other processes. In this process, the phenol recovery is placed before the ammonia recovery, and the extraction and removal efficiency is low. The desulfurization unit is placed after the phenol ammonia recovery. In the front unit, it is easy to generate sulfur ammonia crystals to block the tray and replace it. Heater, no measures to improve the biochemical properties of wastewater before the biochemical unit, the removal rate of pollutants in the biochemical unit is low
[0004] Patent CN105060628B discloses a semi-coke wastewater treatment method, which includes: oil separation sedimentation, coagulation air flotation, phenol extraction, ammonia stripping, anaerobic treatment, anoxic treatment, aerobic treatment, biological aerated filter, etc. process, this process uses the blow-off method to recover ammonia, the gas-liquid ratio is high, and the deamination effect is poor. At the same time, the ammonia blow-off is placed after phenol extraction, and the extraction efficiency is low. The filter basically has no removal effect, and the process has no advanced treatment process, so it is difficult to meet the discharge standard
[0005] Patent CN104724886B discloses a decarbonization and total nitrogen removal process for semi-coke wastewater. The system includes a pretreatment system, a biochemical system and an advanced treatment system. The pretreatment system includes a grease trap and a two-stage air flotation device. The pretreatment system has no Phenolic ammonia recovery measures, advanced treatment using photocatalytic ozonation, high investment and operating costs

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  • Method for treating and recycling wastewater produced by coal middle-low temperature dry distillation

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Experimental program
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Effect test

Embodiment 1

[0050] The wastewater of a medium-temperature dry distillation enterprise of coal, the main indicators of water quality are: COD: 20000mg / L, total phenols: 4000mg / L, oil: 1000mg / L, NH 4 -N: 2000mg / L, CO 2 : 1500mg / L, H 2 S: 100 mg / L, pH 8.1.

[0051] Wastewater treatment and reuse methods are as follows:

[0052] Gravity oil separation unit: remove most of the slick oil and heavy oil in the wastewater, recover tar, reduce the oil content in the wastewater, adopt an advection degreasing tank, and stay for 4 hours. The heavy oil in the oil collection bucket is heated indirectly by steam, and the oil is heated The temperature is above 70°C;

[0053] Ceramic membrane filtration unit: remove suspended oil and coal ash in wastewater to prevent blockage of trays and heat exchangers in the process of stripping, deacidification and deamination; After gravity oil separation unit and ceramic membrane filtration, the oil content of wastewater is reduced to below 150mg / L;

[0054] Str...

Embodiment 2

[0066] The main water quality indicators of a coal medium-temperature dry distillation enterprise wastewater are: COD 32000mg / L, total phenols: 7000mg / L, oil: 1500mg / L, NH4-N: 2500mg / L, CO 2 : 2500mg / L, H 2 S: 120 mg / L, pH 8.3.

[0067] Wastewater treatment and reuse methods are as follows:

[0068] Gravity oil separation unit: remove most of the slick oil and heavy oil in the wastewater, recover tar, reduce the oil content in the wastewater, adopt an advection degreasing tank, and stay for 3 hours. The heavy oil in the oil collection bucket is heated indirectly by steam, and the oil is heated The temperature is above 70°C;

[0069] Ceramic membrane filtration unit: remove suspended oil and coal ash in wastewater to prevent blockage of trays and heat exchangers in the process of stripping, deacidification and deamination; After the gravity oil separation unit and the ceramic membrane filter, the oil content of the wastewater is reduced to below 200mg / L;

[0070] Stripping ...

Embodiment 3

[0082] The wastewater from a coal low-temperature dry distillation enterprise, the main indicators of water quality are: COD: 52000mg / L, total phenols: 12000mg / L, oil: 1800mg / L, NH 4 -N: 3000mg / L, CO 2 : 3500mg / L, H 2 S: 150 mg / L, pH 8.5.

[0083] Wastewater treatment and reuse methods are as follows:

[0084] Gravity oil separation unit: remove most of the slick oil and heavy oil in the wastewater, recover tar, reduce the oil content in the wastewater, adopt a flat flow degreasing tank, and stay for 5 hours. The heavy oil in the oil collection bucket is heated indirectly by steam, and the oil is heated The temperature is above 70°C;

[0085] Ceramic membrane filtration unit: remove suspended oil and coal ash in wastewater to prevent blockage of trays and heat exchangers in the process of stripping, deacidification and deamination; After the gravity oil separation unit and the ceramic membrane filter, the oil content of the wastewater is reduced to below 200mg / L;

[0086]...

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Abstract

The invention discloses a method for treating and recycling wastewater produced by coal middle-low temperature dry distillation. The method comprises the steps of pretreatment, biochemical treatment as well as advanced treatment and recycling. The method concretely comprises the following steps: firstly, carrying out oil removal on the wastewater by means of gravity, filtering and then deacidifying and deaminizing by means of steam stripping; dephenolizing by means of extraction, and removing emulsified oil and suspended solids by means of flocculation-air flotation; reducing chemical oxygen demand (COD) by means of electrochemical oxidation, and then carrying out biochemical treatment including anaerobic treatment, anoxic treatment and aerobic treatment; finally, carrying out advanced treatment and recycling, i.e., coagulation treatment, ozone catalytic oxidation treatment, membrane bioreactor (MBR) treatment, reverse osmosis treatment, and recycling the effluent which reaches the standard. By adopting reasonable optimized combination configuration of all units, the high efficiency recovery of tar, ammonia and phenol in the wastewater as well as the advanced treatment of the wastewater produced by middle-low temperature dry distillation can be realized, and the wastewater is finally recycled by means of desalination, so that pollutant removal and water resource recycling are realized.

Description

technical field [0001] The invention relates to the field of advanced treatment of industrial wastewater, in particular to a treatment and reuse method for low-temperature dry distillation wastewater in coal. Background technique [0002] Medium and low-temperature coal dry distillation technology for coal uses low-rank coal as raw material and dry distillation at 600-800°C to obtain semi-coke, tar and gas products. The waste water produced by it is similar to coking waste water, but due to the type of coal used and The process is different, and the wastewater produced is also different from coking wastewater. The concentration of pollutants is 5-10 times that of coking wastewater. It has complex components, high chroma, high concentration of ammonia nitrogen, volatile phenol and other organic pollutants, and poor biochemical properties. , is a typical high-concentration refractory organic wastewater. The characteristics of medium and low temperature dry distillation wastew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/30C02F101/16C02F103/34
CPCC02F1/24C02F1/26C02F1/40C02F1/441C02F1/4672C02F1/52C02F1/725C02F1/78C02F3/30C02F9/00C02F2001/007C02F2101/16C02F2101/30C02F2103/34C02F2301/08Y02A20/131
Inventor 王靖宇李海波
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL TECH RES INST CO LTD
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