Method for treating high-solid-content organic wastewater by anaerobic-aerobic deep coupling

Abstract

The invention relates to a method for treating high-solid-content organic wastewater by anaerobic-aerobic deep coupling. The method comprises the following steps: crushing and screening organic wastes, adding a slurry liquid obtained by filtration into an anaerobic reaction unit, and carrying out anaerobic fermentation to obtain biogas and biogas slurry; introducing anaerobic outlet water into a solid-liquid separation unit for solid-liquid separation, and enabling separated biogas residues to return into the anaerobic reaction unit through a sludge backflow pump; enabling separated biogas slurry to enter an aerobic reaction unit, and removing nitrogen through a synchronous nitrification and denitrification process; and enabling part of outlet water of the aerobic reaction unit to flow back to the anaerobic reaction unit and undergo full dilution and mixing with organic waste raw slurry liquid for an anaerobic reaction, and enabling the other part of the outlet water to enter a next treatment process or be discharged after reaching the standard. According to the method, the anaerobic outlet water enters the solid-liquid separation unit, suspended solids are separated out, outlet water enters the aerobic reaction unit, the DO value in the water body of the aerobic reaction unit is well controlled, denitrification is completed, then a backflow ratio of aerobic outlet water is controlled and part of the aerobic outlet water returns to the anaerobic reaction unit again, the reaction is circulated, the anaerobic biogas production rate is increased, and meanwhile the water quality of the aerobic outlet water is higher.

Description

technical field

[0001] The invention relates to a method for anaerobic-aerobic deep coupling treatment of organic wastewater with high solid content, and belongs to the technical field of sewage treatment. Background technique

[0002] Anaerobic reactors are generally preferred for waste water treatment and resource utilization. However, since the reactants often contain a large amount of nitrogen-containing substances, during the anaerobic fermentation process, a large amount of protein will be transformed and decomposed, and a large amount of free ammonia nitrogen will be released, resulting in ammonia nitrogen. Accumulated, the ammonia nitrogen concentration often reaches above 2000mg / L. According to research, an important nutritional factor affecting the growth of methanogens is ammonia nitrogen. When the concentration of ammonia nitrogen is 50-200 mg / L, it is conducive to the anaerobic reaction; but when the concentration of ammonia nitrogen reaches 2000 mg / L or more, i...

Examples

application example 1

[0048] A pig farm has 13,500 sows and 150,000 fattening pigs. The manure cleaning method is water-soaked manure mode. The manure and sewage discharge Q=2000m³ / d. Raw water indicators: COD≤18000mg / L, TKN≤1300mg / L, TS<4% , require effluent COD<150mg / L, ammonia nitrogen<100mg / L, and have energy utilization requirements. According to the project requirements, the following process flow is designed: solid-liquid separation unit, anaerobic reaction unit and aerobic reaction unit. The solid-liquid separation unit includes grille, slag separation tank and solid-liquid separator. The anaerobic treatment unit adopts IC reactor, and the aerobic treatment unit adopts synchronous nitrification and denitrification process.

[0049] S1: Feces and sewage pass through the grille, slag separation tank, and solid-liquid separator in sequence, and the floating matter, small particles, and suspended matter in the sewage are intercepted and separated, and after collection, they are composted to obt...

technical field

[0001] The invention relates to a method for anaerobic-aerobic deep coupling treatment of organic wastewater with high solid content, and belongs to the technical field of sewage treatment. Background technique

[0002] Anaerobic reactors are generally preferred for waste water treatment and resource utilization. However, since the reactants often contain a large amount of nitrogen-containing substances, during the anaerobic fermentation process, a large amount of protein will be transformed and decomposed, and a large amount of free ammonia nitrogen will be released, resulting in ammonia nitrogen. Accumulated, the ammonia nitrogen concentration often reaches above 2000mg / L. According to research, an important nutritional factor affecting the growth of methanogens is ammonia nitrogen. When the concentration of ammonia nitrogen is 50-200 mg / L, it is conducive to the anaerobic reaction; but when the concentration of ammonia nitrogen reaches 2000 mg / L or more, i...

Examples

application example 1

[0048] A pig farm has 13,500 sows and 150,000 fattening pigs. The manure cleaning method is water-soaked manure mode. The manure and sewage discharge Q=2000m³ / d. Raw water indicators: COD≤18000mg / L, TKN≤1300mg / L, TS<4% , require effluent COD<150mg / L, ammonia nitrogen<100mg / L, and have energy utilization requirements. According to the project requirements, the following process flow is designed: solid-liquid separation unit, anaerobic reaction unit and aerobic reaction unit. The solid-liquid separation unit includes grille, slag separation tank and solid-liquid separator. The anaerobic treatment unit adopts IC reactor, and the aerobic treatment unit adopts synchronous nitrification and denitrification process.

[0049] S1: Feces and sewage pass through the grille, slag separation tank, and solid-liquid separator in sequence, and the floating matter, small particles, and suspended matter in the sewage are intercepted and separated, and after collection, they are composted to obt...

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