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Method for treating underground water chromium (VI) pollution by using aerobic granular sludge system

A technology for aerobic granular sludge and groundwater chromium, applied in water/sludge/sewage treatment, polluted groundwater/leachate treatment, water pollutants, etc., can solve problems such as high cost and complicated process, and achieve price Inexpensive, good removal ability, high removal effect

Inactive Publication Date: 2022-04-29
河南省环工生态技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aerobic granular sludge technology is a new type of sewage treatment technology that began to be studied in the 1990s. Compared with ordinary flocculent sludge, aerobic granular sludge has good settling performance and has certain resistance to toxic substances. Therefore, it is feasible to use aerobic granular sludge to treat chromium(Ⅵ) in groundwater; however, there is no report on the use of aerobic granular sludge to treat chromium(Ⅵ) in groundwater.
[0005] The invention provides a method for treating chromium (Ⅵ) in groundwater. For the first time, aerobic granular sludge is used in the treatment of chromium (Ⅵ) in groundwater, which solves the problems of complicated process and high cost for treating chromium (Ⅵ) in groundwater. Biological treatment technology of medium chromium (Ⅵ) provides new ideas

Method used

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  • Method for treating underground water chromium (VI) pollution by using aerobic granular sludge system
  • Method for treating underground water chromium (VI) pollution by using aerobic granular sludge system
  • Method for treating underground water chromium (VI) pollution by using aerobic granular sludge system

Examples

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Effect test

Embodiment 1

[0028] Example 1: Sludge domestication and aerobic granular sludge cultivation

[0029] Specific steps are as follows:

[0030] (1) Sludge activation: take the activated sludge from the sewage treatment plant as the inoculation sludge, and the sludge concentration is 2000mg / L. Put the sludge into the reactor and aerate it for 12 hours, so that the color of the sludge turns brown.

[0031] (2) Sludge acclimation: Take groundwater raw water containing chromium (Ⅵ), dilute it by 10 times, 5 times, 2 times, and 1 time in turn, and then pass it into the reactor, and run it for 10 days. Sequential batch operation, one operation cycle is 6 hours , specifically including: water inflow, aeration, sedimentation and water outflow, in which the time of aeration is 4 hours, and domesticated sludge is obtained.

[0032] (3) Start-up and operation of the reactor: add step (2) domesticated activated sludge and steel slag into the reactor, the steel slag particle size is 100 orders, and the ...

Embodiment 2

[0038] Example 2: Sludge domestication and aerobic granular sludge cultivation

[0039] Specific steps are as follows:

[0040] (1) Sludge activation: take the activated sludge from the sewage treatment plant as the seed sludge, and the sludge concentration is 10000mg / L. Put the sludge into the reactor and aerate it for 36 hours, so that the color of the sludge turns brown.

[0041] (2) Sludge acclimation: take groundwater raw water containing chromium (Ⅵ), dilute it by 10 times, 5 times, 2 times, and 1 time in sequence, then pass it into the reactor, and run it for 20 days. , specifically including: water inflow, aeration, sedimentation and water outflow, in which the time of aeration is 22 hours, and domesticated sludge is obtained.

[0042] (3) Start-up and operation of the reactor: add step (2) domesticated activated sludge and steel slag to the reactor, the steel slag particle size is 200 orders, and the dosage is 2.5g / L; Ⅵ) The raw water is uniformly mixed with the slud...

Embodiment 3

[0047] Example 3: Sludge domestication and aerobic granular sludge cultivation

[0048] Specific steps are as follows:

[0049] (1) Sludge activation: take the activated sludge from the sewage treatment plant as the seed sludge, and the sludge concentration is 20000mg / L. Put the sludge into the reactor and aerate it for 72 hours, so that the color of the sludge turns brown.

[0050] (2) Sludge acclimatization: take groundwater raw water containing chromium (Ⅵ), dilute it 10 times, 5 times, 2 times, 1 time in turn, then pass it into the reactor, run for 30 days, sequence batch operation, one operation cycle is 48h , specifically including: water inflow, aeration, sedimentation and water outflow, in which the time of aeration is 46 hours, and domesticated sludge is obtained.

[0051] (3) Start-up and operation of the reactor: Add activated sludge and steel slag domesticated in step (2) into the reactor, the steel slag particle size is 500 mesh, and the dosage is 5g / L; ) raw w...

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Abstract

The invention discloses a method for treating underground water chromium (VI) pollution by using an aerobic granular sludge system. Comprising the following steps: (1) sludge activation: taking activated sludge as inoculation sludge, and aerating the activated sludge to make the sludge become brown; (2) sludge domestication: taking raw underground water containing chromium (VI), diluting the raw underground water by different multiples in sequence, and domesticating the sludge; and (3) starting and operating the reactor: adding the domesticated activated sludge and steel slag into the reactor, introducing raw underground water containing chromium (VI), and gradually culturing the aerobic granular sludge capable of removing the chromium (VI) in the underground water. And (4) increasing the load: continuously increasing the chromium (VI) load of the reactor in the operation process of the reactor. According to the method, the chromium (VI) in the wastewater can be effectively removed, the removal rate reaches 90% or above, and the chromium concentration of the effluent is lower than the limit value of the class III water quality standard (less than or equal to 0.05 mg / L) specified in the Quality Standard for Underground Water (GB / T14848-2017).

Description

technical field [0001] The invention belongs to the technical field of groundwater purification, and in particular relates to a method for treating chromium (VI) pollution in groundwater by using an aerobic granular sludge system. Background technique [0002] Chromium is a typical toxic element and has long been regarded as an important research object of environmental geochemistry. The difference in the chemical form and valence state of chromium in the environment directly leads to the difference in its toxicity. Under normal pollution levels, animals, plants and microorganisms living in the soil will show corresponding damage symptoms. Acute and chronic poisoning will occur when the human body is directly or indirectly exposed to different concentrations of chromium pollutants. [0003] At present, the commonly used treatment methods for chromium (Ⅵ) pollution in groundwater at home and abroad include chemical precipitation, adsorption and ion exchange. Invention pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F101/22C02F103/06
CPCC02F3/12C02F2101/22C02F2103/06C02F2305/06Y02W10/10
Inventor 郑焕焕邹浔程远记韩亚希王小峰宋琳琳卢晓茜
Owner 河南省环工生态技术有限公司
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