Title:
SLUDGE AND KITCHEN COLLABORATIVE DIGESTION PROCESS COUPLED WITH INTERMEDIATE THERMAL HYDROLYSIS
Document Type and Number:
WIPO Patent Application WO/2023/115862
Kind Code:
A1
Abstract:
The present invention belongs to the technical field of sludge treatment, and discloses a sludge and kitchen collaborative digestion process coupled with intermediate thermal hydrolysis. The collaborative digestion process comprises: 1) screening and slurrying kitchen waste, and desanding and deslagging a primary sludge; (2) mixing the kitchen waste and the primary sludge, and subjecting same to first-stage collaborative anaerobic digestion; (3) mixing the first-stage collaborative anaerobic digestion product with the residual activated sludge, and then subjecting same to centrifugal dehydration; 4) subjecting the dehydrated mud cake to thermal hydrolysis; 5) subjecting the thermal-hydrolyzed sludge to a desanding treatment; 6) diluting same followed by heat exchange; (7) second-stage anaerobic digestion; 8) plate-frame dehydration; 9) subjecting the filtrate to an anaerobic ammonia oxidation treatment; and 10) compounding mud cake nutrients to produce organic nutrient soil. In the present invention, the good complementarity of sludge and kitchen in terms of material properties is fully utilized, the thermal hydrolysis configuration is optimized, the generation of hardly-degradable substances is reduced, and the investment on thermal hydrolysis is saved on; the biogas yield and the biogas output are improved, and energy self-sufficiency of a sewage treatment plant is realized on the basis of the centralized treatment method of regional organic solid waste.
Inventors:
WANG JIAWEI (CN)
QILIGEWA (CN)
LI WEI (CN)
REN ZHENGRAN (CN)
WEN YANG (CN)
SUN JILU (CN)
LIU YAO (CN)
QILIGEWA (CN)
LI WEI (CN)
REN ZHENGRAN (CN)
WEN YANG (CN)
SUN JILU (CN)
LIU YAO (CN)
Application Number:
PCT/CN2022/101091
Publication Date:
June 29, 2023
Filing Date:
June 24, 2022
Export Citation:
Assignee:
BEIJING DRAINAGE GROUP CO LTD (CN)
International Classes:
C02F11/04; C02F11/00; C02F11/122; C02F11/18; B09B3/00
Foreign References:
| CN114262137A | 2022-04-01 | |||
| CN103553289A | 2014-02-05 | |||
| CN106676138A | 2017-05-17 | |||
| CN110015828A | 2019-07-16 | |||
| US20180050941A1 | 2018-02-22 | |||
| CN209193764U | 2019-08-02 | |||
| CN109354185A | 2019-02-19 | |||
| US20210323888A1 | 2021-10-21 | |||
| CN208995479U | 2019-06-18 |
Attorney, Agent or Firm:
BEIJING SICHUANG DACHENG INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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