Advanced treatment method for coking distilled ammonia wastewater

A technology for advanced treatment and ammonia distillation of wastewater, which is applied in the directions of oxidized water/sewage treatment, water/sewage treatment, anaerobic digestion treatment, etc. It can solve the problem that the removal efficiency of biochemical systems is not high, it is difficult to meet the discharge or reuse standards, and it is difficult to reach Index requirements and other issues to achieve the effect of improving biodegradability, low processing cost and good stability

Inactive Publication Date: 2017-12-19
SHANDONG LONGANTAI ENVIRONMENTAL PROTECTION SCI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] ① Coking wastewater contains phenols and cyanides that have toxic and inhibitory effects on microorganisms, resulting in low removal efficiency of the biochemical system;
[0007] ② Coking wastewater contains organic matter that is difficult to biodegrade, and

Method used

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  • Advanced treatment method for coking distilled ammonia wastewater

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Effect test

Embodiment 1

[0030] Ammonia distillation wastewater from a coking plant: COD is 2600mg / L, ammonia nitrogen is 1100mg / L, and total nitrogen is 1500mg / L.

[0031]Adopt the treatment method provided by the present invention to process: the wastewater to be treated first adds acid to adjust the pH to 3.5, then acidifies the demulsification tank to demulsify and remove oil, and the acidification and demulsification time is 1 hour; the acidified demulsification effluent is added with 50mg / L ozone and then enters the ozone Pre-oxidation tank, the pre-oxidation time is 20 minutes; the ozone pre-oxidation water enters the air flotation for oil-water separation, and the air flotation hydraulic retention time is 10 minutes; the air flotation water enters the precision filtration unit with a filtration accuracy of 0.05um for secondary oil removal , precision filtration backwash water back to the air flotation unit; precision filtration effluent enters micro-electrolysis for oxidation, removes some orga...

Embodiment 2

[0034] Ammonia distillation waste water produced in coking workshop of a joint iron and steel plant: COD is 6500mg / L, ammonia nitrogen is 2200mg / L, and total nitrogen is 2500mg / L.

[0035] Adopt the processing method provided by the present invention to process: the wastewater to be treated first adds acid to adjust the pH to 1.5, then acidifies the demulsification pool to demulsify and remove oil, and the acidification and demulsification time is 3 hours; the acidified demulsification effluent is added with 200mg / L ozone and then enters the ozone Pre-oxidation tank, the pre-oxidation time is 60 minutes; the ozone pre-oxidation water enters the air flotation for oil-water separation, and the air flotation hydraulic retention time is 60 minutes; the air flotation water enters the precision filtration unit with a filtration accuracy of 0.05um for secondary oil removal , the backwashing water after precision filtration is returned to the air flotation unit; the effluent from preci...

Embodiment 3

[0038] Coking ammonia distillation wastewater produced by a coal coke joint plant: COD is 4000mg / L, ammonia nitrogen is 1300mg / L, and total nitrogen is 1740mg / L.

[0039] Adopt the processing method provided by the present invention to process: the wastewater to be treated first adds acid to adjust the pH to 2.5, then acidifies the demulsification pool to demulsify and remove oil, and the acidification and demulsification time is 2 hours; the acidified demulsification effluent is added with 100mg / L ozone and then enters the ozone Pre-oxidation tank, the pre-oxidation time is 30 minutes; the ozone pre-oxidation water enters the air flotation for oil-water separation, and the air flotation hydraulic retention time is 30 minutes; the air flotation water enters the precision filtration unit with a filtration accuracy of 0.05um for secondary oil removal , precision filtration backwash water back to the air flotation unit; precision filtration water enters micro-electrolysis for oxid...

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Abstract

The invention discloses an advanced treatment method for coking distilled ammonia wastewater. The advanced treatment method comprises the following treatment steps: a, an acidification demulsification step of demulsifying coal tar in an emulsified state to turbid liquid, and controlling the pH value of acidizing fluid to be 1.5-3.5, wherein the demulsification time is 1-3 hours; b, an ozone pre-oxidation step of promoting the coal tar to separate out and oxidizing phenols and cyanogens dissolved in water; c, an air flotation step of separating the demulsified coal tar from water; d, a precision filtering step of performing secondary dephenolization and oil removal; e, a microelectrolysis step of removing partial organic matters and performing ring-opening chain scission on the organic matters, wherein the pH value of inflow water is controlled to be 2-3, the pH value of effluent is controlled to be 3-4, and the microelectrolysis time is 15-120 minutes; f, a Fenton oxidation step; g, a removed anoxic/aerobic bio-chemical step; and h, an electrolytic catalytic oxidation step of performing advanced treatment on organic matters and ammonia nitrogen. The treatment effect can reach the emission concentration limit requirements on COD (Chemical Oxygen Demand), ammonia nitrogen and total nitrogen in Integrated Wastewater Discharge Standard GB8978-1996.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a method for reuse after the depth of physicochemical pretreatment + anoxic biochemistry + aerobic biochemistry + electrolytic catalytic oxidation. Background technique [0002] Coking wastewater is industrial wastewater containing volatile phenols, polycyclic aromatic hydrocarbons, oxygen, sulfur, nitrogen and other heterocyclic compounds produced during the high-temperature dry distillation, purification and recovery of by-products of coking and gas. It is a kind of industrial wastewater with high CODcr, high phenol value, high Ammonia nitrogen and difficult to treat a kind of industrial organic wastewater. There are three main sources: one is residual ammonia water, which is the waste water produced in coal dry distillation and gas cooling, and its water volume accounts for more than half of the total coking waste water, which is the main source of coking waste w...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/18C02F101/34
CPCC02F1/001C02F1/40C02F1/46109C02F1/4672C02F1/52C02F1/66C02F1/722C02F1/725C02F1/78C02F3/02C02F3/28C02F9/00C02F2001/007C02F2001/46138C02F2101/18C02F2101/345
Inventor 代春龙邹宗海魏明勇阚传金孙垂刚高庆刚
Owner SHANDONG LONGANTAI ENVIRONMENTAL PROTECTION SCI TECH CO LTD
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