Method for processing sludge and kitchen wastes

A technology of food waste and treatment methods, which is applied in the directions of sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., which can solve the problems of low gas production rate, low nitrogen content, and easy occurrence Acid inhibition and other issues, to achieve the effect of reducing operating costs, good microbial survival and metabolic environment, and improving system operation stability

Active Publication Date: 2016-08-17
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is to overcome the deficiencies in the prior art. In view of the low organic matter content of the above-mentioned sludge, the common problems of low carbon-nitrogen ratio and low gas production rate in anaerobic digestion alone, and the problems of food waste In anaerobic digestion alone, the carbon-nitrogen ratio is high, and the hydrolysis speed is too fast, resulting in low pH value, low nitrogen content, high salinity, acid inhibition and ammonia nitrogen inhibition, and provides a treatment for sludge and kitchen waste The method overcomes the shortcomings of the existing process of collaborative resource utilization of kitchen waste and sludge, converts food waste and sludge into biogas and biochar fertilizer, and realizes efficient utilization of food waste and sludge collaborative resource, low-carbon , Efficient and clean use of various by-products to achieve the goa

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  • Method for processing sludge and kitchen wastes

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Example Embodiment

[0033] Example 1

[0034] A treatment method for sludge and kitchen waste, such as figure 1 As shown, including the following steps:

[0035] 1) The food waste is crushed, pulped and separated to obtain waste grease, food waste separation water phase and food waste separation solid phase;

[0036] 2) The sludge is subjected to hydrothermal treatment, and the product is separated to obtain the sludge hydrothermal liquid phase and the sludge hydrothermal solid phase;

[0037] 3) Mix the separated water phase of the food waste with the hydrothermal liquid phase of the sludge, and separate the products after anaerobic fermentation to obtain biogas, biogas residue and biogas liquid;

[0038] 4) The food waste separation solid phase, the sludge hydrothermal solid phase and the biogas residue obtained in step 3) are mixed, dried, and carbonized to prepare pyrolysis biochar;

[0039] Among them, the waste grease obtained in step 1) is used as a raw material for the production of fuel or biopla...

Example Embodiment

[0050] Example 2

[0051] This embodiment is basically the same as the embodiment 1, the difference is that the temperature of the hydrothermal treatment in the step 2) is 100-℃, the pressure is 2 bar, and the time is 120 min;

[0052] The method of product separation in step 2) is a plate and frame filter press method;

[0053] The method of product separation in step 3) is a plate and frame filter press method;

[0054] Said step 3) Chinese food waste separation water phase is mixed with sludge hydrothermal liquid phase, and the mixing time is 5 min;

[0055] The conditions of the anaerobic fermentation in the step 3) are that the carbon to nitrogen ratio is 15:1 and the pH value is 6;

[0056] Said step 4) The ratio of the mixed solid phase of Chinese food waste separation, hydrothermal solid phase of sludge and biogas residue is: the total weight of separation solid phase of food waste and biogas residue accounts for 5 of the total weight of the sludge hydrothermal solid phase %, th...

Example Embodiment

[0060] Example 3

[0061] This embodiment is basically the same as embodiment 1, except that the temperature of the hydrothermal treatment in step 2) is 200°C, the pressure is 10 bar, and the time is 30 min;

[0062] The method of product separation in the step 2) is vacuum filtration;

[0063] The method of product separation in the step 3) is vacuum filtration;

[0064] Said step 3) mixing the separated water phase of Chinese food and kitchen waste with the hydrothermal liquid phase of sludge, and the mixing time is 10 min;

[0065] The conditions of the anaerobic fermentation in the step 3) are that the carbon to nitrogen ratio is 35:1 and the pH value is 8;

[0066] Said step 4) the ratio of the solid phase of Chinese food waste separation, the hydrothermal solid phase of sludge and the mixture of biogas residue is: the total weight of the separation solid phase of food waste and biogas residue accounts for 50% of the total weight of the sludge hydrothermal solid phase. %, the mixin...

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Abstract

The invention relates to a method for processing sludge and kitchen wastes. The method comprises the following steps: by utilizing sludge and kitchen wastes as principal raw materials; separating waste oil from kitchen wastes to be taken as the raw material of fuel or bioplastics; taking biological fuel gas, which takes methane as main material and is generated through fermentation, as an external fuel supply; absorbing the nutrient in biogas slurry by the charcoal generated through pyrolysis and then taking the charcoal as a charcoal fertilizer. The method for processing sludge and kitchen wastes provided by the invention meets the increasingly urgent requirement of processing the sludge and kitchen wastes in China at present; the method can be used for efficiently solving the problems of separately processing sludge and kitchen wastes; the classification and valuable utilization of by-products are realized; various by-products are low-carbon high-efficient cleanly utilized; the purposes of best use, energy conservation, environment protection and cost lowering are achieved; the method has excellent economic benefit and environmental benefit.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of kitchen waste and sludge resources, in particular to a treatment method for sludge and kitchen waste. Background technique [0002] With the continuous expansion of the scale and number of urban sewage treatment plants, the amount of sludge generated in my country has increased rapidly, and it is predicted that it will reach 40 million tons per year (calculated with a moisture content of 80%). A large amount of wet sludge is randomly transported, simply landfilled or piled up (accounting for about 60% of the disposal volume), which has caused many cities to be "sieged by poisonous mud", and the social problems caused by this have become increasingly urgent. Landfilling can only be used as a short-term control measure due to the gradual reduction of landfill sites and strong opposition from surrounding residents due to environmental pollution. Developed countries have gone through a dev...

Claims

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Application Information

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IPC IPC(8): B09B3/00C02F11/10C02F11/12C02F3/28C10B53/00C05G3/00
CPCB09B3/00C02F3/28C02F11/10C02F11/122C05D9/00C05F7/00C05F9/04C05G3/00C10B53/00C05F9/00C05F17/00Y02E50/30Y02W10/40
Inventor 汪印余广炜王兴栋李智伟唐晓达李春星
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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