Equipment and method for treating organic wastewater containing medium-chain and long-chain fatty acids

Abstract

The invention discloses equipment and a method for treating organic wastewater containing medium-chain and long-chain fatty acids, and the equipment comprises a pretreatment device which is used for collecting the organic wastewater containing the medium-chain and long-chain fatty acids and removing suspended solids to obtain pretreated organic wastewater; an ozone oxidation device which is used for carrying out catalytic oxidation reaction on the pretreated organic wastewater and ozone under the action of a catalyst to obtain medium-chain and long-chain fatty acid degradation products; an anaerobic reaction device which is used for carrying out anaerobic reaction on the medium-chain and long-chain fatty acid degradation product to obtain a first treatment liquid; a nitrification and denitrification device which is used for carrying out nitrification and denitrification reaction on the first treatment liquid to obtain second treatment liquid; and a coagulation device which is used for dephosphorizing the second treatment liquid to obtain purified water with low medium and long chain fatty acid content. According to the invention, the ozone high-efficiency oxidation technology is applied to degrade medium-chain and long-chain fatty acids in the wastewater, and then biochemical reaction is carried out, so that the degradation rate is high, the operation cost of a wastewater treatment plant is reduced, and stable and standard operation of sewage treatment is ensured.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of organic wastewater treatment containing medium and long-chain fatty acids, and in particular to a treatment equipment and method for organic wastewater containing medium- and long-chain fatty acids. Background technique [0002] Fatty wastewater is very common in animal processing, edible oil processing, and kitchen waste treatment wastewater, and its concentration is high. In some fermented wastewater, there will also be low concentrations of esters. If they are not treated or properly degraded, they will Seriously pollute the environment and cause considerable losses to the enterprise. This kind of wastewater can be organic wastewater produced by fermenting carbon monoxide and / or carbon dioxide gas into alcohol, or a fermentation process with food waste as a substrate, or wastewater produced by other fermentation production processes. Medium- and long-chain fatty acids are a c...

AI Technical Summary

Problems solved by technology

This type of wastewater is characterized by high COD (high inert COD), and because these fatty acids have an inhibitory effect on microbial activity, it will affect the removal efficiency of biochemical reactions

The final result is that the activity of anaerobic and aerobic reaction sludge decreases, and the removal effect is poor, resulting in frequent addition of highly active sludge, high production costs and labor intensity, and unstable sewage treatment operation indicators

[0003] In actual engineering cases, there are almost no anaerobic reactors that successfully treat oily wastewater. Experimental studies have proved that medium and long-chain fatty acids will be adsorbed on the sludge surface in anaerobic reactors, which seriously affects mass transfer and causes pollution. Sludge activity decreases, treatment efficiency decreases, and more seriously, medium and long-chain fatty acids destroy the transport function of bacterial cell membranes, and to a certain extent produce obvious toxicity to anaerobic sludge

[0004] This kind of lipid-containing wastewater is not uncommon, but there are no actual engineering cases on how to reduce the inhibition of medium and long-chain fatty acids on anaerobic sludge. Often, a large amount of new anaerobic sludge is added to ensure the operation of sewage treatment, even if In this way, the indicator is also very unstable

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