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Process method for treating coking wastewater

A technology of coking wastewater and treatment process, which is applied in metallurgical wastewater treatment, water/sewage treatment, chemical instruments and methods, etc. It can solve the problems of long biochemical treatment process, small pH range of micro-electrolysis, and poor impact load resistance. , to achieve enhanced solid-liquid mixing effect, good effect, and strong impact load resistance

Inactive Publication Date: 2013-01-02
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problems mainly solved by the present invention are: the applicable pH range of the micro-electrolysis method is small, there are problems of hardening and channeling, the traditional biochemical treatment process is long, occupies a large area, has poor impact load resistance, and is expensive

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  • Process method for treating coking wastewater

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Embodiment 1

[0021] A coking wastewater treatment process method, including a physical and chemical treatment unit and a biochemical treatment unit; the coking wastewater enters the physical and chemical treatment unit after being regulated by a regulating tank, and the physical and chemical treatment unit is composed of a micro-electrolysis reactor (micro-electrolysis tower) and a sedimentation tank. The micro-electrolysis reaction The device is filled with scrap iron scraps, scrap copper scraps and light bulk materials; the effluent from the micro-electrolysis reactor enters the biochemical treatment unit after being settled in the sedimentation tank; the biochemical treatment unit is a three-phase fluidized bed reactor, and the three-phase The fluidized bed reactor is a filter-type internal circulation three-phase fluidized bed reactor. In the reactor, immobilized activated sludge pellets are used to achieve simultaneous denitrification and carbon removal. The phase forms an internal cir...

Embodiment 2

[0028] A coking wastewater treatment process The treatment process is the same as in Example 1. Among them, the influent COD, ammonia nitrogen, volatile phenol and chroma are about 3500mg / L, 200mg / L, 330 and 800 times respectively. The micro-electrolysis reactor is filled with industrial waste iron shavings, waste copper scraps and coke, and its mass ratio is 10:2:1. The inlet water pH of the micro-electrolysis reactor is 6.0, and the hydraulic retention time is 20 minutes. The three-phase fluidized bed reactor is filled with immobilized activated sludge pellets, and the filling volume accounts for 20% of the effective volume of the reactor. The filter area uses coke as the filter material, the height of the filter layer is 1.2m, the pH of the three-phase fluidized bed reactor feed water is 7.2, the dissolved oxygen is 6mg / L, the temperature is 32°C, and the hydraulic retention time is 20h. The COD of the effluent is 90-120mg / L, the ammonia nitrogen is 5-12mg / L, the volatile ...

Embodiment 3

[0030] A coking wastewater treatment process The treatment process is the same as in Example 1. Among them, the influent COD, ammonia nitrogen, volatile phenol and chroma are about 3500mg / L, 200mg / L, 330 and 800 times respectively. The micro-electrolysis reactor is filled with industrial waste iron shavings, waste copper scraps and zeolite, and the mass ratio is 10:2:1. The inlet water of the micro-electrolysis reactor has a pH of 4.0 and a hydraulic retention time of 45 minutes. The three-phase fluidized bed reactor is filled with immobilized activated sludge pellets, and the filling volume accounts for 30% of the effective volume of the reactor. The filter area uses coke as the filter material, the height of the filter layer is 1.2m, the pH of the feed water of the three-phase fluidized bed reactor is 7.8, the dissolved oxygen is 4mg / L, the temperature is 30°C, and the hydraulic retention time is 30h. The effect is the same as that of Example 2.

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Abstract

The invention discloses a process method for treating coking wastewater. The process method solves the technical problems that a micro-electrolysis method has hardening, channeling and narrow applicability of a pH range and a biochemical treatment process has long flow, large occupied area, poor impact load resistance and high expense. The method comprises a physical-chemical treatment unit consisting of a micro-electrolysis reactor and a settling tank; in the micro-electrolysis reactor, scrap iron, scrap copper and a lightweight blocky material are used as fillers; the pH of inlet water is between 2.0 and 6.0; the waterpower retention time is between 20 and 60 minutes; the method adopts air aeration; the method also comprises a filtering type inner circulating three-phase fluidized bed reactor biochemical treatment unit, and immobilized activated sludge balls are utilized to realize simultaneous denitrification and decarburization; the pH of inlet water is between 7.2 and 8.5; the concentration of dissolved oxygen is between 2 and 6mg / L; the temperature is between 28 and 32 DEG C; the waterpower retention time is between 20 and 40h; the COD of outlet water reaches secondary standard of integrated wastewater discharge standard; and volatile phenol, ammonia nitrogen and chroma reach primary standard of integrated wastewater discharge standard.

Description

Technical field [0001] The invention relates to the technical fields of environmental protection and waste water treatment, in particular to a coking waste water treatment process of micro-electrolysis physicochemical treatment-immobilized activated sludge three-phase fluidized bed biochemical treatment combined technology. Background technique [0002] Coking wastewater is wastewater formed during high-temperature carbonization of coal, gas purification, and chemical product refining. It has complex components, high pollutant concentration, high chroma, high toxicity, very stable properties, and poor biodegradability. It is 0.28-0.32, and the content of ammonia nitrogen and total nitrogen is high. It is a kind of difficult-to-treat wastewater with extremely complex components. [0003] The combination of physicochemical pretreatment and biochemical treatment is currently the main coking wastewater treatment method. Physicochemical pretreatment generally includes stripping,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/461C02F1/52C02F3/12C02F103/16
CPCY02W10/10
Inventor 卢永严莲荷申世峰周申范傅佳骏张建法
Owner NANJING UNIV OF SCI & TECH
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