Device and method for processing restaurant wastewater

Abstract

The invention discloses a device and a method for processing restaurant wastewater. A ferrallitic sheet is used as an anode and a graphite sheet is used as a cathode to carry out pulse direct current electrolysis on the restaurant wastewater so as to cause an electrocoagulation reaction; simultaneously ultrafine ozone bubbles are fed into an electrocoagulation reaction region to strengthen the electrocoagulation reaction, so that ferrous irons Fe2+ generated in the electrolysis process is rapidly converted into ferric irons Fe3+, the volume of flocculate becomes larger and the flocculate precipitates more efficiently to remove most of pollutants in the wastewater; sludge generated in the electrocoagulation process enters an activated sludge reactor and a sludge concentrating and extruding device; and clear water containing a little amount of organic matter enters an aeration-ozone-ultraviolet combined treatment degradation tank and a photocatalyst micro filtration membrane, and finally outflows through a fine porous sand filtering tank. The produced water can reach the primary standard in the industry. The processing method has high impact-load resistance. The outlet water quality is stable. In the engineering, consumables have long service life. Therefore, the processing cost of the restaurant wastewater can be greatly reduced.

Description

[technical field] [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method and a device for treating catering wastewater by direct current pulse electrocoagulation-biodegradation. [technical background] [0002] Catering wastewater pollutants have the characteristics of large organic content, high concentration of suspended solids, large fluctuations in water quality, and complex treatment. They have always been the focus and difficulty of wastewater treatment. At present, centralized treatment such as biological methods and coagulation methods are generally used in the treatment of catering wastewater. It has the disadvantages of large investment and complicated process. The complexity of catering wastewater, the centralized treatment mode of conventional methods, and the extremely high content of organic matter are the most direct reasons why a large amount of catering wastewater is difficult to treat and discharge up to...

AI Technical Summary

Problems solved by technology

[0008] At present, the more mature application is DC flocculation, but its main disadvantages are high energy consumption, easy passivation of electrodes, and alternating pulse electrocoagulation is likely to generate a lot of heat, which increases the uncertainty of electrocoagulation reactions, while DC pulse electrocoagulation uses pulse Direct current, constantly repeating the process of "power supply-power-off-power supply", so that the Fe dissolved in the anode 2+ 、Al 3+ Metal ions such as ions can effectively carry out flocculation reaction with the waste water flow to prevent passivation due to precipitation and deposition at the anode. Since the pulse signal is applied, the electrode reaction is intermittent, which is conducive to the diffusion of active ions and effectively reduces the concentration difference. can save electricity to the greatest extent and improve the efficiency of electrocoagulation

[0009] The method of biologically activated sludge filtration is a device widely used in the treatment of domestic sewage or industrial wastewater. It is generally composed of a biochemical reactor and a filter membrane module. It has the characteristics of low treatment cost, good water quality and low investment, but At the same time, it also has the disadvantages of large one-time investment, large floor area, relatively large influence of weather and climate, complicated process, etc., and is not suitable for the treatment of small-scale and high-organic-concentration catering wastewater.

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