Enhanced air floatation-multistage downward flow biofilter treatment system and method for sulfur-containing produced water

A biological filter and treatment system technology, applied in water/sewage multi-stage treatment, biological treatment device, mining wastewater treatment, etc. The effect of strong capacity, low corrosion rate and low suspended solids content

Pending Publication Date: 2021-01-29
SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the high operating cost and complicated operation of sulfur-containing produced water in the prior art, the present invention proposes an enhanced air flotation-multi-stage downflow biological filter treatment system and method. The effluent contains sulfide, petroleum hydrocarbons, dissolved oxygen, Low content of suspended solids, low corrosion rate, easy operation and low operating cost

Method used

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  • Enhanced air floatation-multistage downward flow biofilter treatment system and method for sulfur-containing produced water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] An enhanced air flotation-multi-stage downflow biological filter treatment system for sulfur-containing produced water, including a mixer 1, an air flotation tank 2, a multi-stage downflow biofilter, a fine filter 6 and a purification jug 7;

[0028] The water inlet of the mixer 1 is connected with a water inlet pump 8, and the mixer 1 is connected with a dosing tank;

[0029] The multi-stage downflow biofilter includes at least two downflow biofilters connected sequentially through aeration pipes 22, and the interior of the downflow biofilter is provided with water distributors 21 from top to bottom , ceramsite filter material layer 20, filter tank supporting layer 19;

[0030] The aeration pipes 22 are all connected with a pressurized dissolved air pump 29, and the pressurized dissolved air pump 29 can increase the dissolved oxygen and head of the filter water inlet for aeration, and the multi-stage downward flow biofilter The water outlet is connected to the bottom...

Embodiment 2

[0039] On the basis of Example 1, the multi-stage downflow biofilter is a three-stage downflow biofilter, including three downflow biofilters connected in sequence through aeration pipes 22, respectively the first The first downflow biofilter 3, the second downflow biofilter 4, and the third downflow biofilter 5.

[0040] The ceramsite filter material layer 20 is composed of heavy ceramsite, the thickness of the ceramsite filter material layer 20 is 1.5~1.8m, and the first-stage downflow biofilter, the second-stage downflow biofilter The ceramsite filter layer 20 of the pool and the third-stage downflow biofilter have a particle size of 3.0mm, 2.0mm, and 2.0mm respectively, and a bulk density of 1.2~1.5g / cm 3 ; The filter support layer 19 is a pebble layer with a particle size of 2-4cm.

Embodiment 3

[0042] On the basis of embodiment 2, utilize described treatment system to process the method for sulfur-containing produced water, comprise the following steps:

[0043] Pump the sulfur-containing produced water into the mixer 1 through the water inlet pump 8, adjust the pH of the sulfur-containing produced water to 6-7, add inorganic flocculants and organic flocculants, mix in the mixer 1, and then enter the air flotation tank 2 , the air-water ratio is adjusted to be 7-10. After the air flotation treatment, the air flotation water flows into the multi-stage downward flow biofilter, and the second-stage downward flow biofilter 4 and the third stage downward flow biofilter are passed through the pressurized dissolved air pump 29. The influent dissolved oxygen of the downflow biofilter 5 is increased for aeration treatment, and the effluent of the multistage downflow biofilter is pumped into the fine filter 6 through the sewage lifting pump 23, and after filtration, the fine fi...

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Abstract

The invention discloses an enhanced air floatation-multistage downward flow biofilter treatment system for sulfur-containing produced water. The enhanced air floatation multistage downward flow biofilter treatment system comprises a mixer, an air floatation tank, a multistage downward flow biofilter, a fine filter and a purified water tank which are connected in sequence, a water inlet of the mixer is connected with a water inlet pump, and a dosing tank is connected on the mixer; the multi-stage downward flow biofilter comprises at least two downward flow biofilters which are sequentially connected through an aeration pipe, and a water distributor, a ceramsite filter material layer and a filter material supporting layer are arranged in each downward flow biofilter from top to bottom; eachaeration pipe is connected with a pressurized dissolved air pump, and a water outlet of the multi-stage downward flow biofilter is connected with one side of the bottom of the fine filter through a sewage lifting pump; and a water outlet of the purified water tank is connected with a bactericide adding device. The invention also discloses a method for treating sulfur-containing produced water by using the system. The effluent has the characteristics of low contents of sulfide, petroleum hydrocarbon, dissolved oxygen and suspended solids and low corrosion rate.

Description

technical field [0001] The invention belongs to the technical field of sulfur-containing sewage treatment, and in particular relates to an enhanced air flotation-multistage downflow biological filter treatment system and method for sulfur-containing produced water. Background technique [0002] The sulfur in the sulfur-containing produced water of oil and gas fields is mostly S, HS - , S 2- , SO 4 2- Exist in other forms, S, SO in anaerobic environment 4 2- Easily reduced to S under the action of sulfate reducing bacteria (SRB) 2- , S 2- It can aggravate the hydrogen embrittlement effect of steel; it is easy to cause serious corrosion to water injection pipe strings and crude oil pipelines; S 2- and corrosion product Fe 2+ It can also be further combined to form FeS precipitation, which will cause formation blockage and bring huge pressure to the operation and maintenance of oilfield equipment; under acidic conditions, insoluble sulfides and S in the produced fluid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/10C02F101/32C02F101/10
CPCC02F1/001C02F1/24C02F1/50C02F1/5236C02F1/54C02F1/66C02F3/02C02F3/104C02F3/107C02F9/00C02F2101/101C02F2101/32C02F2103/10C02F2203/006C02F2301/08C02F2303/14C02F2303/16
Inventor 马天奇董晨曦王丹丹杨志刚马振鹏张淑侠吕雷拓川
Owner SHAANXI YANCHANG PETROLEUM GRP
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