Zero-discharge treatment method of salt-containing organic wastewater

A treatment method and organic wastewater technology, applied in multi-stage water treatment, water/sewage treatment, water treatment parameter control, etc., can solve problems such as high salt content and high organic wastewater

Inactive Publication Date: 2016-03-30
DATANG INT CHEM TECH RESINST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems existing in the existing zero-discharge treatment technology of saline organic wastewater, the present invention provides a stable and reliable treatment method in order to effectively improve the treatment efficiency of saline organic wastewater and solve the problems generated during the brushing cycle of the evaporation system. Problems caused by high-salt and high-organic wastewater make the zero-discharge wastewater treatment system operate efficiently and stably

Method used

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  • Zero-discharge treatment method of salt-containing organic wastewater
  • Zero-discharge treatment method of salt-containing organic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This example is used to illustrate the zero discharge treatment method of saline organic wastewater of the present invention.

[0044] Such as figure 1 The zero-discharge treatment method for waste water produced by pressurized gasification of crushed coal is shown. The equipment used to implement the method includes a main biochemical treatment unit, a recycling unit, an advanced treatment unit, a Fenton oxidation unit and a three-effect evaporation connected in sequence crystal unit. Among them, the main biochemical treatment unit includes regulating tank, UASB (upflow anaerobic sludge bed), anoxic / aerobic (A / O) treatment tank, biological aerated filter (BiologicalAeratedFilter, BAF), through the main biochemical treatment The process efficiently degrades organic matter. The recycling unit concentrates the waste water through coagulation sedimentation, ultrafiltration and reverse osmosis, and the concentrated product water is reused. The advanced treatment unit inc...

Embodiment 2

[0079] This example is a comparative example, and it differs from Example 1 in that the treatment method of this example does not include a Fenton oxidation unit, and the nanofiltration concentrated water of the advanced treatment unit is mixed with the seawater reverse osmosis concentrated water of the advanced treatment unit Then directly enter the evaporation crystallization unit. In this case, the water inflow to the evaporative crystallization unit is 83m 3 / h, COD is 575mg / L; set the effective volume of the evaporator to 500m 3 , after one month of operation, the COD in the evaporator accumulated to about 68724mg / L, causing serious foam problems, and the high content of calcium and magnesium in the evaporator led to serious scaling problems, which ultimately affected the production load and stability of the evaporator run. The quality of the produced water is reduced, and the saturated saline solution waste water has nowhere to be discharged when cleaning the tank, whi...

Embodiment 3

[0081] This example is used to illustrate another method for zero discharge treatment of saline organic wastewater of the present invention.

[0082] Such as figure 2 The zero-discharge treatment method for pharmaceutical wastewater shown, the main equipment used to implement the method includes a main biochemical treatment unit, a reuse unit, an advanced oxidation unit, a concentration unit and an evaporation crystallization unit connected in sequence. Among them, the main biochemical treatment unit includes primary sedimentation tank, UASB (two-stage upflow anaerobic sludge bed), A / O unit, and MBR unit to remove suspended solids and organic matter; the recycling unit includes nanofiltration, reverse osmosis, etc. The unit concentrates the salt-containing organic wastewater and obtains pure product water, which is recycled; the advanced oxidation unit includes a combination unit of ozone oxidation and photocatalytic oxidation to treat the evaporation of nanofiltration concen...

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Abstract

The invention provides a zero-discharge treatment method of salt-containing organic wastewater. The method comprises the following steps that biochemical treatment and filtering treatment are performed on wastewater; then, membrane concentration is performed; pure-water-producing high-organic-matter-content membrane concentration concentrated water and optional low-organic-matter-content membrane concentration concentrated water are obtained; the high-organic-matter-content membrane concentration concentrated water is used for high-grade oxidation treatment; high-grade oxidation produced water is used for regulation treatment to obtain high-grade oxidation outlet water; the obtained high-grade oxidation outlet water is subjected to evaporation treatment; or the obtained high-grade oxidation outlet water and the low-organic-matter-content membrane concentration concentrated water are mixed under the condition that the low-organic-matter-content membrane concentration concentrated water exists in the step, and then, the evaporation treatment is carried out; external discharge concentration liquid of an evaporator and / or high-salt-content high-organic-matter-content wastewater discharged during the tank brushing of the evaporator are conveyed back into a high-grade oxidation treatment unit; after the liquid is mixed with the high-organic-matter-content membrane concentration concentrated water, the high-grade oxidation treatment is carried out. The wastewater treatment method is stable and reliable; the long-period and stable operation of an evaporation system can be ensured; the zero discharge of the industrial wastewater is realized.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a zero-discharge treatment method for saline organic wastewater. Background technique [0002] At present, in the field of coal chemical wastewater and related industrial wastewater treatment, biochemical systems are used to degrade organic matter in wastewater, membrane treatment systems are used to treat and reuse wastewater, and membrane concentrated concentrated water is treated in the form of evaporation and crystallization. widely recognized and applied. [0003] Biochemical treatment systems can remove most organic matter. With the concentration treatment of wastewater by membrane system (nanofiltration, reverse osmosis, forward osmosis, membrane distillation), relatively pure and recyclable produced water is obtained, while organic matter and salt are concentrated in concentrated water. Evaporation and crystallization system evaporates and crystallizes memb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F9/00C02F1/001C02F1/04C02F1/20C02F1/44C02F1/441C02F1/442C02F1/444C02F1/445C02F1/447C02F1/4693C02F1/52C02F1/66C02F1/72C02F1/722C02F3/02C02F3/06C02F3/102C02F3/12C02F3/28C02F3/2826C02F3/2833C02F3/284C02F3/2846C02F3/2873C02F3/30C02F5/02C02F2101/30C02F2209/05C02F2209/08C02F2209/11C02F2301/08C02F2305/023C02F2305/026C02F2305/04
Inventor 李春启王宝强岳培恒张文博牟伟腾刘学武梅长松
Owner DATANG INT CHEM TECH RESINST
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