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Full-quantitative treatment method of kitchen biogas slurry

A technology for quantitative treatment and biogas slurry, which is applied in the field of fully quantitative treatment of kitchen biogas slurry, can solve the problems of difficult treatment, high organic content, and high salinity in membrane concentrate, so as to enhance removal efficiency, improve solid-liquid separation efficiency, and achieve The effect of full quantization processing

Active Publication Date: 2021-03-26
NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing treatment process has the problem of membrane concentrate, which has high salt content and high organic content, making it difficult for subsequent treatment.

Method used

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  • Full-quantitative treatment method of kitchen biogas slurry
  • Full-quantitative treatment method of kitchen biogas slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Using the method of the present invention to treat the biogas slurry wastewater of a certain kitchen collection and transportation center, COD: 40000~50000mg / L, TDS: <10000mg / L, TN: <1800mg / L, NH3-N: <500mg / L, pH Value: 6~9. This waste water passes through the UASB system, and the UASB volume load is 5kgCOD / (m3d), so that 80% of the COD in the kitchen wastewater is removed, and the COD in the effluent of the UASB system is reduced to 8000~10000mg / L. In the first-level A / O process, the return flow of the mixed liquid from the first-level O pool to the first-level A pool is controlled at 400%, and the first-level A / O system is used to remove 75% of COD and 85% of ammonia nitrogen in the system. The COD in the effluent of the primary A / O system is 2000~2500mg / L, and the ammonia nitrogen content is less than 90mg / L. The first-level A / O produced water flows into the second-level A / O treatment system, and the return flow from the second-level O pool to the second-level A poo...

Embodiment 2

[0051] Using the method of the present invention to treat a venous industrial park kitchen waste water, COD: 40000~45000mg / L, TDS: <9000mg / L, TN:<2000mg / L, NH3-N:<600mg / L, pH value: 6~9 . After the kitchen wastewater is anaerobically treated, the COD in the wastewater is reduced to 8000~9000mg / L; the anaerobic effluent flows into the A / O system by itself, and in the first-level A / O system, the reflux ratio of the nitrifying liquid is controlled at 300%, and the COD is removed The ammonia nitrogen removal rate is 70%, the ammonia nitrogen removal rate is 85%, the COD in the effluent of the primary A / O system is 1200~1350mg / L, and the ammonia nitrogen is <90mg / L; The removal rate is 30%, the ammonia nitrogen removal rate is 50%, the COD after the secondary A / O process is 840~945mg / L, and the ammonia nitrogen is <45mg / L. The effluent from the secondary A / O system enters the MBR treatment system to achieve sufficient mud-water separation. The water from the MBR system enters the...

Embodiment 3

[0053] Using the method of the present invention to treat a venous industrial park kitchen waste water, COD: 45000~50000mg / L, TDS: <10000mg / L, TN:<1500mg / L, NH3-N:<400mg / L, pH value: 4~8 . After three-phase degreasing, the kitchen waste water enters the UASB anaerobic treatment system, the COD in the waste water is reduced to 9000~10000 mg / L, and the COD removal is above 80%; the anaerobic effluent is sent to the first-level A / O treatment system to further remove the waste water Ammonia nitrogen and organic matter in the wastewater, after the first-level A / O treatment, the COD in the wastewater is reduced to 1300mg / L~1500mg / L, and the ammonia nitrogen is reduced to 50~70mg / L; the effluent of the first-level A / O system enters the second-level A / O system Outlet water, further remove COD, ammonia nitrogen, and total nitrogen in the wastewater, and reduce the COD in the effluent of the secondary A / O system to 800mg / L~1000mg / L, the ammonia nitrogen to 30~50mg / L, and the total nitro...

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Abstract

The invention discloses a full-quantitative treatment method for kitchen biogas slurry. The full-quantitative treatment method is based on a UASB treatment unit, a primary A / O treatment unit, a secondary A / O treatment unit, an MBR and an electrocatalytic oxidation treatment unit which are connected in sequence. According to the method, full-quantitative treatment of the kitchen biogas slurry is realized, and on the basis of a common treatment method, an A / O process is adopted, so that the removal efficiency of ammonia nitrogen in the kitchen wastewater is enhanced; an MBR treatment process isadded, and mud-water separation is performed through a physical interception effect, so that the solid-liquid separation efficiency is greatly improved; and the biochemical tail end adopts an electrocatalytic oxidation technology to replace the traditional membrane treatment technology used at the biochemical tail end, so that the membrane concentrated solution generated in the membrane advanced treatment process is overcome, the full-quantitative treatment of the kitchen biogas slurry wastewater is realized, and the kitchen biogas slurry wastewater completely reaches the discharge standard specified by the state.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for fully quantitatively treating biogas slurry from kitchens. Background technique [0002] The main components of kitchen waste water are leftover food and water, with starch, dietary fiber, animal and vegetable fats and other organic matter as the main components, with high organic matter content, high water content, high oil and salt content, perishable fermentation and odor features. [0003] my country has high requirements for the discharge standard of waste water from restaurants, and implements the "Water Quality Standard for Sewage Discharge into Urban Sewers" (GB / T31962-2015) Class B standard, in which COD ≤ 500mg / L, BOD5 ≤ 350 mg / L, NH3-N ≤ 45mg / L, total nitrogen ≤70mg / , in addition to some heavy metal indicators also need to meet the corresponding emission standards. [0004] At present, kitchen wastewater in my country is mainly processed through kitch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/122C02F11/123C02F11/125C02F11/15C02F101/16C02F101/30
CPCC02F9/00C02F11/125C02F11/122C02F11/123C02F11/006C02F11/15C02F3/30C02F2101/30C02F2101/16C02F1/4672C02F2001/007Y02E50/30
Inventor 刘军高兴旺孙少龙李春泉刘彦奎韩珊珊刘健
Owner NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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