Method for anaerobic treatment of vegetable garbage through liquid-residue separation

Abstract

The invention discloses a method for anaerobic treatment of vegetable garbage through liquid-residue separation. The method comprises the following steps: step 1, crushing and dehydrating vegetable garbage, and dividing the vegetable garbage into dry residues and filtrate; 2, feeding the dry residues into a dry anaerobic treatment line; feeding the filtrate into an IC anaerobic treatment line; 3, treating the dry residues by a pulping machine to obtain slurry, and carrying out temperature regulation and blending on the slurry together with the refluxed anaerobic discharged material and the settled slurry at the bottom of the filtrate regulating tank in a slurry regulating tank; sending the adjusted slurry to a dry anaerobic reactor for anaerobic fermentation, wherein a part of a fermented product, namely anaerobic discharged material, flows back to the slurry adjusting tank; 4, removing colloidal, flocculent and floating foam impurities from the filtrate through a lifting basket grid, and then caching and regulating the temperature of the filtrate in a filtrate regulating tank; and sending the adjusted slurry to an IC anaerobic reactor for anaerobic treatment. According to the invention, independent anaerobic treatment is carried out on filtrate and dry residues obtained after vegetable waste liquid-residue separation, so that the volume and the occupied area of the anaerobic reactor are obviously reduced, the engineering investment is reduced, and the anaerobic gas production efficiency is improved.

Description

Technical field [0001] The present invention belongs to the technical field of waste treatment with, in particular, to a method of anaerobic treatment of liquid residue separating vegetable waste. Background technique [0002] Vegetables collection mining, processing, transportation, sale residue will be removed when the old leaves, damaged part, which produce vegetable waste, also known as tail dish. Garbage wide range of vegetables, including vegetables, leaves, seedlings, stems, roots, fruit drop, of which a large proportion of leaves and seedlings. [0003] Vegetable refuse high moisture content, generally 80% to 95%, a larger proportion of seedling leaves and water content is generally 90% to 95%, less dry, perishable, deterioration, or dumping of discarded easy to produce malodorous gases fluid and rot, the breeding of mosquitoes, spread the bacteria that causes pollution and rural water and soil pollution, environmental health and human health. At the same time, waste of v...

AI Technical Summary

Problems solved by technology

[0003] The moisture content of vegetable waste is relatively high, generally 80% to 95%, and the moisture content of leaves and seedlings, which account for a large proportion, is generally 90% to 95%. The dry matter is less, and it is easy to rot and deteriorate. Random stacking or discarding is easy to produce malodorous gas and rotten liquid, breed mosquitoes and flies, spread bacteria, cause pastoral pollution, water and soil pollution, and affect environmental sanitation and human health

At the same time, vegetable waste is rich in nitrogen, phosphorus, potassium and other elements, as well as crude protein, crude fiber, crude fat and other nutrients. Mode treatment, and some of them are used for feed treatment, but all of them have disadvantages due to the high water content of vegetable waste, such as: low gas production rate of anaerobic fermentation, large volume of anaerobic reactor, large land occupation, large biogas slurry output, Aerobic composting and feed conversion require a large amount of additional high-solid auxiliary materials, etc.

[0004] The invention patent with the patent application number 201510424607.7 discloses a method for efficient anaerobic fermentation of organic waste in intensive vegetable areas to produce biogas. The solid content of materials is adjusted to 8%-12 by adding bacteria, feces, and straw. % carry out wet anaerobic fermentation, but this method belongs to the traditional wet anaerobic method, and still has the disadvantage of large volume of anaerobic reaction equipment

[0005] The invention patent with the patent application number 201611220575.X discloses a light-duty mobile anaerobic dry fermentation system for vegetable waste and a method for anaerobic fermentation using the system. A specific anaerobic fermentation is carried out by adding high-solid straw mixed with vegetable waste. Oxygen dry fermentation, biogas residues are directly composted without producing biogas slurry, but this method is only suitable for vegetable waste with a water content of less than 88%, and is only suitable for small-scale applications due to its mobility

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