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Flue gas desulfurization waste liquid treatment and activated sludge reduction treatment method

A desulfurization waste liquid and activated sludge technology, applied in sludge treatment, aerobic process treatment, biological sludge treatment, etc., can solve the problems of unable to remove ammonia nitrogen and discharge into the environment, and achieve the effect of eliminating ammonia nitrogen pollution

Active Publication Date: 2014-06-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is still a problem in the forced oxidation treatment of flue gas desulfurization waste liquid, that is, when the flue gas is denitrified and desulfurized at the same time, the forced oxidation treatment technology of flue gas desulfurization waste liquid cannot remove the ammonia nitrogen that may be contained in the wastewater, that is, this part of ammonia nitrogen will be waste water into the environment

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The sulfur-containing tail gas of a process is desulfurized by sodium-alkali method, and the desulfurization waste liquid does not contain suspended solids, and is directly introduced into the flue gas desulfurization waste liquid oxidation device. The COD in the wastewater is 3000mg / L, and the activated sludge is introduced, and the activated sludge content (MLVSS) is maintained at 800mg / L, the aeration time is 2h, and the air-water ratio is 15:1. Use zeolite as the filter material to filter the wastewater with a filtration rate of 6m / h.

[0022] After being treated by the present invention, the suspended matter SS in the wastewater discharged into the solid-liquid separation device is 380mg / L, SS is not detected in the filtered wastewater, and the COD is 45mg / L, and the wastewater can be directly discharged. The amount of activated sludge was reduced by 52.5%.

Embodiment 2

[0024] A flue gas desulfurization process adopts the sodium-alkali method, the desulfurization waste liquid suspended matter SS 2600mg / L, COD 2600mg / L, the concentration of activated sludge MLVSS 800mg / L was introduced into the wastewater, the aeration time was 2 hours, and the air-water ratio was 15:1. The first-stage solid-liquid separation device is an inclined plate sedimentation tank with a hydraulic retention time of 40 minutes, and the second-stage solid-liquid separation device uses zeolite filtration with a filtration rate of 6m / h.

[0025] After being treated by the present invention, the SS in the wastewater discharged into the solid-liquid separation device is 340mg / L, the SS in the filtered wastewater is not detected, the COD of the wastewater is 40mg / L, and the wastewater can be discharged directly. The amount of activated sludge was reduced by 57.5%.

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Abstract

The invention relates to a flue gas desulfurization waste liquid treatment and activated sludge reduction treatment method, belonging to the field of environmental protection. Excess activated sludge from a sewage treatment plant is introduced into a flue gas desulfurization waste liquid oxidation treatment device. Sulfite in wastewater is converted into sulfate under the action of the activated sludge, and meanwhile, the activated sludge is in the endogenous respiration state, and can acquire energy by self-consumption, thereby implementing activated sludge reduction. The invention can be implemented only by laying one pipeline and introducing a right amount of excess activated sludge from the sewage treatment plant into the flue gas desulfurization waste liquid oxidation device; and therefore, the technique is simple, and is especially suitable for enterprises in which a sewage treatment plant and a flue gas desulfurization facility are simultaneously constructed.

Description

technical field [0001] The invention provides a flue gas desulfurization waste liquid treatment method and a sludge reduction treatment method, belonging to the technical field of environmental protection. Background technique [0002] Sulfur dioxide is the most important gaseous pollutant affecting the quality of the air environment, and countries all over the world often use sulfur dioxide as one of the main indicators to measure the state of their air quality. At present, there are many flue gas desulfurization methods researched by various countries, more than one hundred kinds, and they are divided into two categories: dry method and wet method. Among them, the wet desulfurization technology has the characteristics of simultaneous desulfurization and dust removal, flexible maneuverability, strong applicability, low investment and low operating costs, and is considered by the environmental protection department and relevant experts and scholars as a practical technology ...

Claims

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Application Information

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IPC IPC(8): C02F3/02C02F9/14C02F11/02
CPCY02W10/10Y02W10/20
Inventor 王明星彭德强齐慧敏王海波刘忠生
Owner CHINA PETROLEUM & CHEM CORP
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