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Fine Treatment Method of Oily Sewage Ultrafiltration Membrane

A treatment method and ultrafiltration membrane technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc. , poor pollution resistance and other problems, to achieve the effects of good hydrophilicity, good regeneration, and good water permeability

Active Publication Date: 2015-08-19
SENUO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional ultrafiltration membranes used at this stage have not been widely used in the treatment of oily sewage due to their high requirements on influent water quality, poor pollution resistance, complex treatment processes, and low temperature resistance.

Method used

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  • Fine Treatment Method of Oily Sewage Ultrafiltration Membrane
  • Fine Treatment Method of Oily Sewage Ultrafiltration Membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] see figure 1 , oily sewage ultrafiltration membrane fine treatment method, adding NaClO as oxidant and fungicide to oily sewage (oil content ≤ 10mg / L, suspended solids content ≤ 10mg / L), and controlling the mass fraction of NaClO in oily sewage to 0.002% ~0.004%; then the oily sewage enters the ultrafiltration device and passes through the PTFE ultrafiltration membrane [the membrane flux is 40L / (m 2 h))] for ultrafiltration treatment.

[0014] The ultrafiltration device performs backwashing and air washing once every 20-30 minutes of filtration (one cycle), the backwashing flow rate is 1.5-2 times the filtered water inflow, the backwashing pressure is 120kPa-170kPa, the backwashing time is 20s-60s, and the air Wash air volume is 4m 3 / h~9m 3 / h, the air washing time is 30s~90s;

[0015] The ultrafiltration device performs a chemically enhanced backwash every 12 to 18 cycles of filtration. The chemically enhanced backwash is followed by alkali washing and pickling. T...

Embodiment 2

[0021] On the basis of Example 1, the reuse of ultrafiltration concentrated water is considered in the auxiliary system, and the ultrafiltration concentrated water is returned to the water inlet tank of the front ultrafiltration membrane, and ultrafiltration is performed again, thereby improving the water production rate. Reduced water production cost and sewage discharge.

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Abstract

The invention relates to a fine treatment method of an oily sewage ultrafiltration membrane. The fine treatment method comprises the following steps: adding an oxidant and a bactericide into pretreated oily sewage, wherein the oxidant and bactericide are NaClO; then enabling the oily sewage to flow in an ultrafiltration device and conducting ultrafiltration treatment through a PTFE (Polytetrafluoroethylene) ultrafiltration membrane; carrying out chemical cycling cleaning to the ultrafiltration membrane after running for certain time, and then conducting alkali washing and acid washing, wherein the alkali liquor selected for chemical cycling cleaning is NaOH solution with the mass percentage of 4%-10%, and the acid liquor is hydrochloric acid with the mass percentage of 0.5%-3%. The adopted PTFE ultrafiltration membrane has the characteristics of being high in strength, high-temperature-resistant, pollution-resistant, acid-washing-resistant and alkali-washing-resistant, and good in hydrophilicity, the treated sewage is subjected to assay detection and the results are as follows: the oil content (no more than 0.05mg / L) is not detected, the content of suspended matters is 0.6mg / L, the median particle diameter of the suspended matters is 1.0mum, which meets the requirement on the highest water quality in the Water quality standard and practice for analysis of oilfield injecting waters in clastic reservoirs SY / T5329-2012, and can meet the water quality requirement on the injected water of an oilfield hypotonic block.

Description

technical field [0001] The invention relates to the technical field of oil extraction sewage treatment, in particular to a method for fine treatment of oily sewage with an ultrafiltration membrane. Background technique [0002] As Shengli Oilfield strengthens the development of low-permeability oil reservoirs and other difficult-to-develop blocks, "sewage reinjection" has played an important role in the oilfield's sustained high and stable production and maintaining the ecological environment. "Sewage re-injection" is to re-inject the produced sewage into the formation after being treated up to standard, so as to effectively supplement the energy of the formation and ensure the smooth progress of crude oil production. If the water quality is not up to standard, the reinjection will easily cause serious corrosion of the pipeline, damage the formation, and affect the production of crude oil. [0003] At present, the traditional fine filtration devices used in oilfields mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/44B01D65/02
Inventor 张晓云朱悦提阳崔光涛唐磊落
Owner SENUO TECH CO LTD