Low-energy-consumption degradation-resistant organic wastewater recycling method

Abstract

The invention provides a low-energy-consumption degradation-resistant organic wastewater recycling method, belonging to the technical field of degradation-resistant wastewater resourcezation. After degradation-resistant organic wastewater is treated by pH adjustment, hydrolytic acidification, Fenton oxidization and electrolytic pretreatment, the degradation-resistant organic wastewater is treated by adopting a membrane bioreactor (an aerobiotic biotechnology) coupled with a microbial fuel battery (an anaerobic biotechnology), electric energy consumption of the membrane bioreactor is compensated by electric energy generated by the microbial fuel battery, and meanwhile, the surface of a membrane bioreactor assembly as the negative pole of the microbial fuel battery is charged by negative electricity to generate electrostatic repulsion among membrane surface contaminants so as to effectively alleviate membrane pollution. Compared with conventional treatment processes, wastewater treatment energy consumption per ton is reduced by 40-70%, the COD (Chemical Oxygen Demand) and the ammonium-nitrogen removal rate of the system reach 92.0-99.5%, and the effluent quality accords with a first level standard A in Pollutant Discharge Standard of Municipal Wastewater Treatment Plant of China (GB18918-2002) and the reuse demand in the industry. The method provided by the invention is scientific and reasonable in technology, and has important meaning for recycle of degradation-resistant organic wastewater.

Description

technical field [0001] The invention discloses a method for recycling refractory organic wastewater with low energy consumption, and belongs to the technical field of resource utilization of refractory organic wastewater. Background technique [0002] In recent years, as an advantageous combination of wastewater physical and biological treatment technologies, the membrane bioreactor (Membrane Bioreactor) is known for its low yield of excess sludge and high efficiency of nitrogen removal, and its ultimate goal is to recycle organic wastewater (or reuse) and make it harmless. Bioreactor (MBR) technology has been widely used in the field of organic wastewater treatment. According to statistics, there are more than 300 MBR organic wastewater treatment projects in operation or under construction in my country, including nearly 10 sets of 10,000-ton MBR systems. However, domestic and foreign practices have shown that operating costs and membrane fouling are always the main obstac...

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Problems solved by technology

However, as one of the anaerobic biological treatment technologies, MFC is difficult to obtain excellent effluent water quality, and it is combined with nitrification process, sequencing batch reactor, biological turntable, biological contact oxidation, etc., and even MFC is placed in the exposure of activated sludge process In the air pool, the water quality of the MFC effluent can be improved, but the above-mentioned processes cannot effectively remove the suspended solids in the effluent of the system, and it is difficult to reuse

[0003] The water quality of biodegradable organic wastewater has the following characteristics: (1) the water quality is complex, with many by-products, and the reaction raw materials are often solvent substances or compounds with ring structures, which increases the difficulty of wastewater treatment; (2) due to the reaction of raw materials in wastewater Incomplete and raw materials or a large amount of solvent medium used in production enters the wastewater system, resulting in COD and BOD 5 (3) There are many toxic and harmful substances, and many refractory pollutants are poisonous and harmful to microorganisms, such as halogen compounds, nitro compounds, dispersants or surfactants with bactericidal effects, etc., most of which have been listed in my country And in the blacklist of US EPA environmental priority control pollutants: (4) High chroma of wastewater; (5) High salt content

Common salts are mainly chlorides, sulfates and phosphates, etc.: (6) The proportion of nutrients required by microorganisms is seriously out of balance. Relatively lacking; (7) The water quality changes greatly, the biodegradability is poor, and the refractory substances with relatively large molecular weight are dominant, and the BOD / COD value is very low, close to or lower than 0.1

[0004] Throughout the research and engineering practice of treatment technology for refractory organic wastewater at home and abroad, it can be found that there are mainly the following problems: (1) The efficiency of conventional methods for treating wastewater is not high, some toxic compounds are difficult to remove, and the effluent cannot really reach discharge Standard; (2) Some special processes or equipment require large investment, and the cost of wastewater treatment is high, making it difficult to popularize and apply; (3) The system is relatively complex, with high requirements for operation and operation, and the stability needs to be improved

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