High-concentration sewage treatment method

Abstract

The invention discloses a high-concentration sewage treatment method. The method includes the steps: firstly, using an electrochemical oxidation method for pretreatment of sewage to obtain pretreated sewage; and secondly, adjusting the pH (potential of hydrogen) value of the pretreated sewage to range from 7.0 to 9.0, inoculating microalgae into the sewage, and subjecting the sewage to microalgaebiological treatment so as to purify the sewage, wherein the microalgae biological treatment operating conditions include: the temperature ranges from 25 DEG C to 30 DEG C, the light dark period is 12:12, the illumination intensity ranges from 40001ux to 60001ux, and the steps include aerating or mechanically stirring and continuously culturing for ten to twenty days. By the high-concentration sewage treatment method, sewage treatment cost is reduced, pollutant removal efficiency is improved. Further, the high-concentration sewage treatment method is wide in sewage treatment range, free of secondary pollution and flexible and controllable in operation mode, and environment-enhancing energy is realized.

Description

technical field [0001] The invention relates to a method for treating high-concentration sewage. Background technique [0002] In recent years, with the rapid development of industry and agriculture and population growth, the discharge of sewage has increased sharply, causing many rivers, rivers, lakes, reservoirs and even groundwater to be polluted to varying degrees. How to efficiently and economically treat sewage is an important issue related to environmental protection and sustainable development of industrial and agricultural production. [0003] At present, although there are many studies on the use of microalgae to purify sewage at home and abroad, comprehensive analysis from the existing literature shows that the sewage treated by microalgae biological methods is mostly limited to the secondary effluent of urban sewage treatment plants. Concentrations of pollutants are low. The pollutants that microalgae can remove are limited to easily biodegradable (or biodegrad...

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Problems solved by technology

[0004] The pretreatment methods usually used for sewage biological treatment influent are mainly chemical oxidation method, chemical flocculation method, microwave radiation method, adsorption method, filtration method, etc., but these methods often have the following problems: the efficiency of pretreatment to remove pollutants is low, and the operation The process requires the addition of chemical reagents to cause secondary pollution to the sewage. The water output is unstable due to the process, and the operating cost is high.

This method needs to add magnetic substances such as ferric oxide and ferric hydroxide and flocculants, and the magnetic seeds and flocculants need to be recovered during the treatment process, which has the problems of complicated process, cumbersome operation and high treatment cost during use.

[0009] Through analysis, the existing relevant sewage treatment technologies have the following deficiencies: (1) Traditional biological treatment methods are low in cost, but the pollutants that can be removed are limited to easily biodegradable (or biodegradable) substances in water, and are difficult to biodegrade Substances have almost no removal effect

Some organic substances in sewage are toxic to sewage treatment microorganisms, resulting in low growth activity of microorganisms, poor purification effect, long treatment time, and low pollutant removal efficiency; (2) Chemical treatment of sewage requires adding oxidants or flocculation The operation is complicated, and it is easy to cause secondary environmental pollution, and the water output is unstable due to the process, and the operating cost is high; (3) The electrochemical method is used to treat sewage, which has problems such as large power consumption and high treatment cost.

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