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A device and method for hydrolysis and acidification pretreatment of excess sludge

A pretreatment device, hydrolytic acidification technology, applied in water/sludge/sewage treatment, biological sludge treatment, anaerobic digestion treatment, etc. Uneven quality and other problems, to achieve the effect of resource utilization of waste, reduction of kinetic energy consumption, and strong controllability

Active Publication Date: 2021-10-22
ANHUI ZHONGHUAN ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] In order to solve the deficiencies in the prior art, the present invention provides a device and method for hydrolysis and acidification pretreatment of excess sludge, so as to solve the problem of sludge caused by large kinetic energy consumption and uneven mass transfer in the existing excess sludge pretreatment reactor. Technical issues of low wall breaking and lysis efficiency

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  • A device and method for hydrolysis and acidification pretreatment of excess sludge
  • A device and method for hydrolysis and acidification pretreatment of excess sludge
  • A device and method for hydrolysis and acidification pretreatment of excess sludge

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Embodiment 1

[0045] The solid content of the sludge is 3%, and the remaining sludge is processed by three methods of high-gravity reactor, ferrous-persulfate and high-gravity reactor coupling ferrous-persulfate of the present invention, and the speed of the high-gravity reactor 1000rpm, Fe 2+ The addition amount is 40mg / g VSS, the addition amount of persulfate is 1:1 according to the ratio of ferrous and persulfate substances, and the reaction time is 20min. After treatment, the sludge lysis rate (%) and supernatant are respectively measured. VFA content (mg.L-1), the VFA of the original sludge supernatant is 11.2mg.L -1 , the result is as Figure 6 shown. The lysis rates of the remaining sludge after treatment were 22.6%, 32.7% and 43.5%, respectively, and the VFA of the sludge supernatant were 80.3mg.L -1 , 175.3mg.L -1 and 224.5mg.L -1 . Using a high-gravity reactor coupled with persulfate to treat excess sludge, the sludge lysis rate and supernatant VFA were the highest, which we...

Embodiment 2

[0047] The solid content of the sludge is 3%, and the remaining sludge is processed by three methods of high-gravity reactor, ferrous-persulfate and high-gravity reactor coupling ferrous-persulfate of the present invention, and the speed of the high-gravity reactor 1000rpm, Fe 2+ The addition amount is 40mg / g VSS, the addition amount of persulfate is 1:1 according to the ratio of ferrous and persulfate substances, and the reaction time is 30min. After treatment, the sludge lysis rate (%) and supernatant are respectively measured. VFA content (mg.L -1 ), the VFA of the original sludge supernatant was 11.2mg.L -1 , the result is as Figure 7 shown. The lysis rates of the remaining sludge after treatment were 26.8%, 38.9% and 48.5%, respectively, and the VFA of the sludge supernatant were 100.2mg.L -1 , 240.6mg.L -1 and 329.5mg.L -1 . Using a high-gravity reactor coupled with persulfate to treat excess sludge, the sludge lysis rate and supernatant VFA are the highest, whic...

Embodiment 3

[0049] The solid content rate of the sludge is 5%, and the remaining sludge is processed by three methods of high-gravity reactor, ferrous-persulfate and high-gravity reactor coupling ferrous-persulfate of the present invention, and the speed of the high-gravity reactor 1000rpm, Fe 2+ The addition amount is 40mg / g VSS, the addition amount of persulfate is 1:1 according to the ratio of ferrous and persulfate substances, and the reaction time is 20min. After treatment, the sludge lysis rate (%) and supernatant are respectively measured. VFA content (mg.L -1 ), the VFA of the original sludge supernatant was 11.2mg.L -1 , the result is as Figure 8 shown. The lysis rates of the remaining sludge after treatment were 18.2%, 28.6% and 38.3%, respectively, and the VFA of the sludge supernatant were 75.6mg.L -1 , 165.3mg.L -1 and 202.7mg.L -1 . Using a high-gravity reactor coupled with persulfate to treat excess sludge, the sludge lysis rate and supernatant VFA were the highest,...

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Abstract

The invention relates to the technical field of sludge resource utilization, and discloses a device and method for hydrolysis and acidification pretreatment of excess sludge. The invention adopts a supergravity field integrated device for enhancing mass transfer efficiency, which is used for rotating mass transfer and reaction of solid-liquid phase contact. After the sludge passes through the filter screen, it is mixed with ferrous persulfate in the pipeline and then passed through the hollow The rotating shaft exits the hole. Under the action of the centrifugal force of the centrifugal impeller, it collides with the concave-convex attachment plate on the inner wall of the reactor shell and then evenly distributes in the reactor. , forming a comprehensive mechanical, hydraulic, and chemical action, breaking and lysing microbial cells, and leaching intracellular substances to realize the release of carbon sources from excess sludge. The invention can reduce the kinetic energy consumption of reactor operation, and can also solve the problem of uneven mass transfer in traditional reactors, has the characteristics of high efficiency, energy saving and low cost operation, and has engineering application prospects in sludge hydrolysis acidification pretreatment.

Description

technical field [0001] The invention belongs to the technical field of sludge resource utilization, and in particular relates to a device and method for hydrolysis and acidification pretreatment of surplus sludge. Background technique [0002] Excess sludge is solid waste generated in sewage treatment. The amount is huge and must be disposed of reasonably. Domestic sewage plants generally have the problem of insufficient carbon sources. They often achieve TN compliance by adding external carbon sources, which increases additional operating costs. In response to these two problems, the researchers found that the volatile fatty acids (VFA) produced by the hydrolysis and acidification of the excess sludge can be used as an additional carbon source in the activated sludge system to improve the pollutant removal efficiency of the system. Increase the solid content, the excess sludge can obtain high concentration of VFA in the hydrolysis and acidification stage, and the supernatan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/06C02F11/02C02F3/28C02F101/16
CPCC02F3/28C02F11/02C02F11/06C02F2101/16
Inventor 宋永莲伍昌年唐玉朝王莉刘俊陶森森陈嘉雄凌琪
Owner ANHUI ZHONGHUAN ENVIRONMENTAL PROTECTION TECH CO LTD
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