System and method for treating high-concentration organic waste liquid

Abstract

The invention belongs to the field of wastewater treating, and particularly relates to a system and a method for treating high-concentration organic waste liquid. The organic waste liquid can be efficiently processed in a low-consumption, energy-saving and environment-friendly manner. The system for treating the high-concentration organic waste liquid comprises a gasification chamber, a combustor, a smoke pipe, a waste liquid pump, a waste liquid tank, a settling chamber, demisting baffles and a condenser. The gasification chamber is located at the top of the combustor. A primary auxiliary fuel nozzle, a waste liquid nozzle and at least one air inlet are formed in the upper portion of the side wall of the gasification chamber. A secondary air inlet and a secondary auxiliary fuel nozzle are arranged at the upper portion of the side wall of the combustor. An exhausting opening of the combustor directly extends into the waste liquid tank through the smoke pipe. The settling chamber is installed at the top of the waste liquid tank. The multiple demisting baffles are installed at the upper portion of the interior of the settling chamber. A gas outlet in the top of the settling chamber is communicated with a gas inlet of the condenser through a pipe. An inlet of a condenser heat exchanging pipe is connected with a waste liquid delivery pipe. A waste liquid outlet in the waste liquid tank is sequentially communicated with the waste liquid pump and the waste liquid nozzle through a pipe.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a high-concentration organic waste liquid treatment system and treatment method. Background technique [0002] The fine chemical industries such as pharmaceuticals, pesticides, dyes, chemical reagents, and surfactants are developing rapidly, and the environmental hazards brought about by them are also becoming more and more obvious. The high-concentration refractory organic waste generated in the process needs to be treated urgently. [0003] At present, the treatment methods of high-concentration refractory organic waste liquid mainly include: advanced oxidation technology and incineration technology. Advanced oxidation technology has the problem that some organic pollutants are difficult to decompose or the decomposition efficiency is not high, especially for condensed rings, heterocycles and other extremely refractory organic compounds; and most refrac...

AI Technical Summary

Problems solved by technology

The combustion chamber of this type of incinerator is mostly made of refractory materials, so the pH, salt, and chloride ion content of the organic waste liquid are strictly required. The pH of the waste water must be neutral, and the salt content and chloride ion concentration in the waste liquid must not exceed the requirements. Otherwise, the furnace body and pipes will be damaged rapidly due to corrosion and scaling, and the application will be greatly restricted.

However, most of the high-concentration refractory organic waste liquids in the fine chemical industry have the remarkable characteristics of extremely acid (or extremely alkaline), high salt content, and high chloride ion concentration, and are difficult to be directly incinerated. The waste liquid needs to be pretreated before incineration Increase the cost of the process, which has the disadvantages of high investment, high operating cost, and narrow adaptability

In addition, indirect heating is often used to concentrate waste liquid in the waste liquid concentration process, which has the disadvantages of low heat exchange efficiency and poor concentration effect.

In terms of combustion exhaust gas treatment, most of them follow the conventional flue gas treatment water spray absorption process. This process requires supporting equipment, which is relatively complicated, and the waste water generated by absorption still needs further treatment, and zero discharge has not been achieved.

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