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System and method for recycling application of desulfurization waste water

A desulfurization wastewater and recycling technology, applied in the field of water treatment, can solve problems such as energy waste, affecting biological growth environment, and soil salinization

Pending Publication Date: 2017-07-11
FUJIAN LONGKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has two disadvantages: one is that the effluent has the saline quality characteristics of high sulfate radicals, high chloride radicals, and high hardness (high calcium and high magnesium). If it is discharged directly, it will inevitably cause salinization of the soil and affect the growth environment of organisms. The second is that my country is a coal-based thermal power country. The water intake of thermal power plants in my country accounts for about 30% to 40% of the industrial water volume. If the effluent is directly discharged, it will cause a huge waste of energy.

Method used

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  • System and method for recycling application of desulfurization waste water

Examples

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Embodiment 1

[0073] A) Desulfurization wastewater resource utilization system

[0074] The system provided in this example mainly includes a primary clarifier, a primary reaction tank, a primary clarifier, a secondary pool composition. Among them, the primary clarifier, the primary clarifier, the secondary clarifier, the tertiary clarifier and the quaternary clarifier all have water outlets and sediment outlets. The outlet of the reaction box is connected to the inlet of the primary clarification tank, the outlet of the primary clarification tank is connected to the secondary reaction tank, the outlet of the secondary reaction tank is connected to the secondary clarification tank, and the outlet of the secondary clarification tank is connected to the tertiary reaction tank The outlet of the third-stage reaction box is connected with the inlet of the third-stage clarifier, the outlet of the third-stage clarifier is connected with the fourth-stage reaction box, and the outlet of the fourth-...

Embodiment 2

[0094] Take the flue gas wet desulfurization wastewater from another coal-fired power plant, and use the system in Example 1 to recycle the desulfurization wastewater. The specific process includes:

[0095] 1) The desulfurization wastewater first passes through the primary clarifier for clarification and separation for 2 hours. The sediment enters the filter press of the clarifier through the sludge pump of the clarifier for dehydration. For outbound processing. The waste water from the clarification tank was sampled, and the water quality was tested and analyzed. The main components are as follows:

[0096]

[0097] 2) The supernatant of the primary clarification tank is input to the primary reaction tank after water quality testing, and the pH meter and agitator in the tank are started, and 5wt% milk of lime is added at the same time to adjust the pH value to 9.5, then stop adding milk of lime, and then add sodium sulfide , the dosage of sodium sulfide is 25mg / L, after ...

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Abstract

The invention relates to the field of water treatment and particularly relates to a system and method for recycling application of desulfurization waste water. The system comprises a primary clarification tank, a primary reaction tank which is connected to the primary clarification tank and is provided with lime milk, alkali metal sulfide and flocculant feeding inlets, a primary clarification tank which is connected to the primary reaction tank, a secondary reaction tank which is connected to the primary clarification tank and is provided with an alkali metal hydroxide feeding inlet, a secondary clarification tank which is connected to the secondary reaction tank, a tertiary reaction tank which is connected to the secondary clarification tank and is provided with an alkali metal meta-aluminate feeding inlet, a tertiary clarification tank which is connected to the tertiary reaction tank, a quaternary reaction tank which is connected to the tertiary clarification tank and is provided with a CO2 gas inlet, and a quaternary clarification tank which is connected to an outlet of the quaternary reaction tank. Waste water treated by the system can satisfy supplementary water quality requirements of a desulfurization tower. Resources in the waste water can be recovered and are used for preparation of chemical products such as magnesium hydroxide, calcium sulphoaluminate / calcium chloroaluminate and aluminum hydroxide.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a resource utilization system and method for desulfurization wastewater. Background technique [0002] The "limestone / lime-gypsum method" is widely used in flue gas desulfurization treatment in thermal power plants because of its high system reliability and high efficiency. However, in order to maintain the material balance of the flue gas desulfurization system, prevent the chloride ion of the desulfurization system from exceeding the specified value and ensure the quality of gypsum, a certain amount of waste water must be discharged from the system. The water quality of this part of wastewater (desulfurization wastewater) is complex and changeable, mainly containing suspended solids, supersaturated sulfite, sulfate, chloride, calcium and magnesium ions and trace heavy metals. In particular, high concentrations of chloride ions are highly corrosive under acidic condit...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/18
CPCC02F9/00C02F2305/02C02F2301/08C02F2001/007C02F2103/18C02F1/52C02F1/5245
Inventor 陈奎续张晖栋林福全陈金亮娄彤黄友华
Owner FUJIAN LONGKING
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