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Comprehensive treatment method for wastewater of coal coking device

A coal coking and wastewater technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of non-recycling, complicated treatment process, investment, operating costs, high land occupation, etc. question

Active Publication Date: 2012-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Through analysis, the above-mentioned treatment methods mainly have the following problems: First, none of the sewage diversion treatment and quality-based reuse methods are proposed based on the nature of the source water, resulting in mixed treatment of different types of wastewater, resulting in complex water quality and increased treatment difficulty , It is not conducive to sewage reuse and material recovery; secondly, high-concentration volatile phenols, petroleum and other pollutants in sewage are not recovered, resulting in waste of resources and heavy pollution load of terminal treatment; third, the treatment process is more complicated, investment, High operating costs and land occupation

Method used

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  • Comprehensive treatment method for wastewater of coal coking device
  • Comprehensive treatment method for wastewater of coal coking device

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Embodiment 1

[0033] The treatment method of the present invention is used to classify and classify the waste water discharged from the coal coking production plant of a coal chemical enterprise of a coal mine group in China, the condensed cooling and separated waste water after the coal tar distillation treatment, and the refined waste water of products such as gas and tar. quality reuse. Among them, the pollution composition of DC cooling spray wastewater is petroleum 400mg / L, suspended matter 4000mg / L, volatile phenol 3000mg / L, and temperature 56°C; the pollution composition of tar distillation condensation cooling sewage is petroleum 9000mg / L, COD 12000mg / L, ammonia nitrogen 370mg / L, volatile phenol 3040mg / L, sulfide 0.5mg / L, pH 7.8, temperature 60°C; gas and tar and other products refined mixed drainage petroleum 300mg / L, COD 1500mg / L, ammonia nitrogen 100mg / L L. Volatile phenol 100mg / L, sulfide 50mg / L, pH 7-8, temperature 35°C. The method of the invention is adopted for classificati...

Embodiment 2

[0038] Adopt the treatment method of embodiment 1, process the direct-flow spray cooling waste water 2000m identical with embodiment 1 3 / h. The main components and process parameters of the treatment device are: (1) two groups of inclined plate sedimentation tanks, which adopt a closed structure, and the overall combined size is 20×15×8m; the effective residence time is 15min, and the surface load is 3.0m 3 / m 2 h; the pool body adopts steel concrete structure, lined with glass fiber reinforced plastic for anticorrosion; the sloping plate is made of hard plastic plate; equipped with 2 sets of screw mud conveyors. (2) 4 hydrocyclones, the size of each unit is 1.02×0.955×2.755m; the design pressure is 0.04MPa; the material is made of wear-resistant composite materials. (3) 7 sets of coalescing filters, single size 6.6×2.2×2.2m; filtration rate 40m / h, pressure 0.1~0.2MPa; main material adopts carbon steel structure; filler adopts hydrophilic and oleophobic fiber filter materia...

Embodiment 3

[0041] Adopt the processing method of embodiment 1, process the same tar distillation waste water 4.0m as embodiment 1 3 / h and 24m from Example 2 3 / h system sewage. The main components and process parameters of the treatment device are: (1) One high-efficiency oil-water separator, with a diameter of 1.2m and a height of 2.15m; the operating pressure is 0.1-0.2MPa; the main material is made of carbon steel; the filler is made of coarse-grained polymer filter materials; set up an online automatic backwashing system. (2) One dissolved air flotation machine, 4.35×2×2.2m; dissolved air pressure 0.3MPa, reflux ratio 50%; main material adopts steel concrete integrated structure, lined with glass fiber reinforced plastic for anticorrosion; supporting auxiliary equipment includes dissolved air tank 1 set, 1 set of dissolved air water pump, 1 set of mud scraper, 3 sets of TVIII air releaser. (3) One intermediate pool, with a size of 3.5×3.5×4m; the effective residence time is 30 min...

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Abstract

The invention relates to a comprehensive treatment method for wastewater of a coal coking device. The method comprises the following steps of: removing oil and suspended matters from once-through cooling spray wastewater, cooling 80 to 99 percent of wastewater in an air cooling tower, circularly using the cooled wastewater as cooling spray water, and mixing the rest wastewater serving as once-through cooling spray blowoff water and tar distillation wastewater subjected to oil-water separation for treatment; performing advanced oil removal and dephenolizing treatment on the mixed wastewater, recycling dirty oil and volatile phenol from the mixed wastewater, and introducing effluent obtained through treatment into a comprehensive oily sewage treatment system; and treating comprehensive oilywastewater from other sources by using biochemical methods including an intermittent activated sludge process, and recycling effluent obtained through treatment and serving as make-up water of the once-through cooling spray water. By the method, the wastewater can be totally recycled or circularly used, pollutants are effectively recycled, and aims of saving water, reducing emission, recycling wastes and reducing source pollution loading; and the method has obvious environmental benefit and better economic benefit.

Description

technical field [0001] The invention relates to a comprehensive treatment method for wastewater produced by a coal coking device, which is suitable for comprehensive treatment of wastewater produced by high-temperature coal coking or low-temperature semi-coking production devices. Background technique [0002] Coal coking device uses coal as raw material, coking reaction occurs in high-temperature carbonization furnace or low-temperature vaporization furnace to generate coke (or semi-coke), tar and gas, and then produces coke through cooling, electric capture, separation, washing and purification, refining and other processes (or semi-coke), purified gas, and the production process of chemical products. Coal coking units produce a large amount of waste water with high pollutant content and difficult biodegradation. [0003] At present, coal coking wastewater at home and abroad mainly adopts a mixed treatment method, and the treatment method adopted is mainly a combined proc...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 郭宏山许谦刘淑鹤朱卫
Owner CHINA PETROLEUM & CHEM CORP
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