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Kitchen waste pretreatment system and method

A food waste and pretreatment technology, which is applied in the direction of special treatment targets, anaerobic digestion treatment, chemical instruments and methods, etc., can solve the problems of low organic matter recovery rate, broken bags of bagged garbage, and difficulty in removing impurities, etc. High yield and oil phase yield, high recycling rate and low operating cost

Pending Publication Date: 2021-09-28
中国环境保护集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are the following defects: (1) In principle, the organic matter in the garbage does not conform to the size rule, and only has the significance of sorting in probability, and particle size sorting will inevitably cause a large loss of organic matter; (2) The bagged garbage must be broken. ; (3) Sorting rejects are still garbage, and garbage treatment is still needed, and the reduction rate is low
However, there are the following defects: (1) crushing and pulping will cause a large amount of impurities to be broken into the slurry together, which will bring difficulties to the subsequent removal of impurities; (2) the organic matter in the pressing pulping will be carried away by the impurities, and the recovery rate of organic matter is extremely low

Method used

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  • Kitchen waste pretreatment system and method
  • Kitchen waste pretreatment system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A kind of food waste pretreatment system (partial reference figure 1 ), including receiving hopper 1, pulper 2, discharge tank 3 (connected to pulper drain), high-concentration desander 4, sand-water separator 5, heat exchanger 6 (tube side) connected in sequence ), a sterilization tank 7, a three-phase centrifuge 8, a water buffer tank 9 (connected to the water phase outlet of the three-phase centrifuge), a heat exchanger 6 (shell side);

[0041] It also includes a screw press, the screw press is connected to the slag outlet of the pulper;

[0042] The pulper 2 (partial reference figure 2 ) includes a pulping chamber 10, a rotor 11 arranged in the pulping chamber, a food waste inlet 12 and a slagging outlet 13 arranged on the wall of the pulping chamber, and a A sieve plate 14 at the opening at the bottom of the body, and a drain port 15 is arranged below the sieve plate;

[0043] The rotor 11 is arranged vertically above the sieve plate, and it includes a rotating...

Embodiment 2

[0046] Adopt the system described in embodiment 1, carry out kitchen waste pretreatment according to the method of the present invention, specifically comprise the following steps:

[0047] (1) The food waste is discharged into the receiving hopper. The dry basis composition of the food waste is shown in Table 1, and the chemical composition table is shown in 2.

[0048] Table 1 Composition list of food waste (dry basis)

[0049]

[0050] Table 2 Chemical composition of food waste

[0051]

[0052] (2) The kitchen waste is conveyed to the pulper by the shaftless screw conveyor installed at the bottom of the receiving hopper (see Table 3 for equipment parameters), and industrial water is added to the pulper through the annular water spray pipe to adjust the solid content of the kitchen waste 6%, turn on the rotor to rotate for slurry treatment, the rotor allows the garbage flow to form a strong eddy current field, and within 3 to 5 minutes, the kitchen garbage is decompo...

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Abstract

The invention provides a kitchen waste pretreatment system and method. The system comprises a pulpifying machine, wherein the pulpifying machine comprises a pulpifying cavity, a rotor arranged in the pulpifying cavity, a kitchen waste inlet and a residue discharging opening which are formed in the wall of the pulpifying cavity, and a sieve plate arranged at an opening in the bottom of the pulpifying cavity, and a liquid discharging opening is formed below the sieve plate; a desanding system communicating with the liquid discharging opening of the pulpifying machine; a sterilization device communicating with a liquid discharging opening of the desanding system; and a three-phase centrifugal machine which communicates with a discharge port of the sterilization device and is used for separating the materials from the sterilization device into a water phase, an oil phase and residue materials. By means of the kitchen waste pretreatment system, high-precision separation of the water phase, the oil phase and residues in kitchen waste can be achieved; the biological anaerobic degradation product yield and the oil phase yield are high, and the kitchen waste recycling rate is high; and the water phase purity is high, and the stability of a subsequent anaerobic system is facilitated.

Description

technical field [0001] The invention relates to the technical field of garbage treatment, in particular to a system and method for pretreatment of kitchen garbage. Background technique [0002] At present, in addition to the two major harmless treatment processes of landfill and incineration, the separate treatment of kitchen waste is mostly based on biochemical treatment and resource utilization, and biochemical treatment is mainly based on two major treatment processes: anaerobic digestion and aerobic composting. . Compared with the traditional aerobic composting process, anaerobic digestion is carried out in a closed environment, the environmental impact is relatively small, and it has great advantages in the impact on the surrounding environment and the utilization of the final product, representing the current mainstream development direction. [0003] Because anaerobic digestion technology only works on organic matter, and food waste is a mixture of organic matter an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C02F9/14C02F3/28C02F1/38C02F103/06
CPCB09B3/00C02F9/00C02F3/28C02F2103/06C02F2303/24C02F2303/02C02F1/38
Inventor 毛勇位黄智彭子锐王晓郭凯陈奕名戴瑞峰李晓磊隋洪志仲跻胜杨东
Owner 中国环境保护集团有限公司
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