Fischer-Tropsch synthesis reaction waste water resource treatment process and its system

Abstract

The invention discloses a recycling treatment process and system for wastewater in a Fischer-Tropsch synthesis reaction. The process comprises the following steps: (1) performing filtering treatment, namely separating out preprocessed purified water and oil-containing concentrated water, and recovering the oil-containing concentrated water; (2) performing anaerobic treatment, namely performing acidification and methanation reactions on the preprocessed purified water in the anaerobic condition to recover methane gas; (3) performing primary aerobic treatment, namely further decomposing organic matters in water by aerobic microorganisms; (4) performing secondary aerobic treatment, namely performing organic matter deep degradation and solid-liquid separation on outlet water subjected to primary aerobic treatment by an MBR (membrane bioreactor) process to enable the outlet water to meet circulating cooling water quality standards. The system comprises an inorganic ceramic membrane filter device, an anaerobic reaction pond, an aerobic reaction pond and an MBR. According to the recycling treatment process and system, the organic matters in the wastewater in the Fischer-Tropsch synthesis reaction are utilized with low cost and water resources are recovered; the organic matters in the water are decomposed by anaerobic biological treatment to recover the methane gas, so that organic matter resources are maximally utilized and the energy consumption is greatly reduced.

Description

technical field [0001] The invention relates to waste water treatment technology, in particular to a Fischer-Tropsch synthesis reaction waste water resource treatment process and a system thereof. Background technique [0002] With the rapid increase in oil demand and limited domestic resources, my country's dependence on foreign oil will increase year by year. The production of liquid fuels from solid fuels such as coal and biomass is one of the important ways to solve my country's oil shortage and reduce foreign dependence. Fischer-Tropsch synthesis is an important solid fuel liquefaction method, usually referred to as Fischer-Tropsch synthesis, which is produced by gasifying solid fuels such as coal or biomass under the condition of iron-based, cobalt-based or iron-cobalt-based catalysts. Syngas (mainly CO and H 2 ) The process of directional catalytic synthesis of hydrocarbon fuels and chemicals. During the Fischer-Tropsch synthesis reaction, the synthesis gas synthesize...

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Problems solved by technology

[0005] About the first kind of distillation or rectification separation method, as: CN1617917A discloses a kind of method for purifying the water-rich stream produced in Fischer-Tropsch reaction, CN101492332A discloses a kind of separation method of Fischer-Tropsch synthesis reaction aqueous phase by-product, CN1696082A Disclosed is a treatment method for Fischer-Tropsch synthesis reaction water. CN101239886A discloses a method for separating and recovering organic matter in high-temperature Fischer-Tropsch synthesis reaction water. This type of method has the following disadvantages: 1) It is necessary to heat the reaction water to above 100° C. Distillation and separation of organic oxides in water requires extremely high energy consumption, increasing the consumption of desalinated water, and the cost is very high, especially for Fischer-Tropsch synthesis reaction water containing organic oxides less than 10%; 2) this category The method only considers the separation of organic oxygen compounds in wastewater, but the Fischer-Tropsch synthesis reaction wastewater after extracting organic oxygen compounds cannot be purified up to the standard, and can neither be directly discharged nor reused in production

Treating Fischer-Tropsch synthesis reaction wastewater with this type of method reduces energy consumption and lower operating costs, but it also has the following disadvantages: 1) Single consideration is to treat the organic oxygen compounds in the wastewater to achieve the water quality index for wastewater reuse Requirements, the oxidation precipitation separation and filtration removal process used to remove the organic oxygen compounds in the water in the form of precipitation, failed to effectively recover the valuable organic oxygen compounds in the Fischer-Tropsch synthesis reaction water; 2) At the same time, new solid waste was formed, brought environmental pollution

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