Solid-liquid separation method and device for multi-material anaerobic fermentation liquid containing kitchen wastes

Abstract

The invention discloses a solid-liquid separation method and device for multi-material anaerobic fermentation liquid containing kitchen wastes and belongs to the technical field of kitchen waste treatment. A first discharging hole of a filter press is connected with a feeding hole of an oil-water separation tank by virtue of a pipeline; an overflow port of the oil-water separation tank is connected to a first conditioner by virtue of a pipeline; a submersible sewage pump is arranged in the first conditioner; the discharging hole of the submersible sewage pump is connected with a feeding hole of a multi-disk screw thickener; a second discharging hole of the multi-disk screw thickener is connected to a second conditioner by virtue of a pipeline; the second conditioner is connected with a feeding hole of a plunger pump by virtue of a pipeline; a discharging hole of the plunger pump is connected with a feeding hole of a plate-and-frame filter press; a residue outlet collection bucket of the plate-and-frame filter press is connected with the feeding hole of a residue delivery screw; the discharging hole of the residue delivery screw is connected with a residue box. Aiming at the material characteristics, the problems generated during operation of the original anaerobic fermentation liquid solid-liquid separation equipment with participation of kitchen wastes are gradually solved, the operating stability is improved, the treatment effect is ensured, the operating cost is reduced, secondary pollution is reduced, and the solid residues obtained by solid-liquid separation meet the national standard.

Description

technical field [0001] The invention relates to a solid-liquid separation method and device for a multi-material anaerobic fermentation liquid containing kitchen waste, belonging to the technical field of kitchen waste treatment. Background technique [0002] The main source of food waste is the kitchen industry and unit canteens. Due to many factors in current management and collection, the composition of food waste entering the factory is complex. Its components may include but not limited to: oil, water, fruit peels, vegetables, rice noodles , fish, meat, bones and waste tableware, glass containers, metal utensils, plastics, paper towels, etc. According to its material properties, the mainstream treatment process of domestic food waste is pretreatment + anaerobic digestion. At present, in the field of waste disposal, the industrial recycling park model is being established. It is a package project for the unified treatment of domestic waste, municipal sludge, urban excre...

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Problems solved by technology

[0004] The solid content of the supernatant liquid from centrifugal dehydration is about 1%-1.5%, and the moisture content of the slag is about 85%-80%. It is easy to get stuck, needs to be shut down for maintenance, and maintenance is difficult

The moisture content of the slag discharged from the centrifuge can reach up to 80%, which cannot meet the national standard "Standards for Pollution Control of Domestic Waste Landfill Sites" (GB 16889-2008) "The moisture content of solid residues after biological treatment such as anaerobic biogas production Less than 60%, can enter the domestic waste landfill for landfill disposal" requirements

[0005] The two methods of belt filter press and plate and frame filter press are better for the treatment of inorganic sludge. Food waste contains animal and vegetable oils, as well as suspended particles, etc., which will block the filter cloth during operation and greatly reduce the work of the filter press. Efficiency and water and mud output indicators, high operating costs and long operating hours

The two dehydration processes of belt filter press and plate and frame filter press need to add lime as a conditioning agent. Lime will cause secondary pollution during use, and at the same time affect the reutilization of solid residue after dehydration; at present, the existing sewage treatment in Beijing In the actual use of the factory, it has been clearly stated that lime should not be used, so it is urgent to find new agents that can replace lime but have no secondary pollution.

[0006] Drying treatment: It can meet the process requirements and treatment goals, and the solid content of slag can be adjusted according to demand, but the energy consumption of process equipment is high, so it is not the best choice for economical feasibility

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