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

Method used

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  • System and method for recycling application of desulfurization waste water
  • System and method for recycling application of desulfurization waste water
  • System and method for recycling application of desulfurization waste water

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0072] Example 1

[0073] A) Desulfurization wastewater resource utilization system

[0074] The system provided in this embodiment mainly includes a primary clarification tank, a primary reaction tank, a primary clarification tank, a secondary reaction tank, a secondary clarification tank, a tertiary reaction tank, a tertiary clarification tank, a fourth-level reaction tank, and a fourth-level clarification Pool composition. Among them, the primary clarification tank, the first clarification tank, the second clarification tank, the third clarification tank and the fourth clarification tank are all equipped with water outlets and sediment outlets. The outlet of the primary clarification tank is connected with the first-stage reaction tank. The outlet of the reaction tank is connected with the inlet of the first clarification tank, the outlet of the first clarification tank is connected with the second reaction tank, the outlet of the second reaction tank is connected with the seco...

Example Embodiment

[0093] Example 2:

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

[0095] 1) The desulfurization wastewater is first clarified and separated in the primary clarifier for 2 hours. The sediment is discharged into the clarifier filter press through the clarifier mud pump for dehydration, and the filtrate is returned to the primary clarifier through the primary clarifier filter press effluent lift pump. For outbound processing. The wastewater from the clarification tank is sampled and analyzed for water quality. The main components are as follows:

[0096]

[0097] 2) The supernatant of the primary clarification tank is tested for water quality and then input to the first-level reaction tank, and the pH meter and agitator in the tank are started. At the same time, 5wt% of lime milk is added to adjust the pH to 9.5, then the...

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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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