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Device and method for hydrolytic 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 reducing kinetic energy consumption, realizing waste resource utilization, and strong controllability

Active Publication Date: 2021-05-04
ANHUI ZHONGHUAN ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Device and method for hydrolytic acidification pretreatment of excess sludge
  • Device and method for hydrolytic acidification pretreatment of excess sludge
  • Device and method for hydrolytic 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 Image 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 wer...

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 a method for hydrolytic acidification pretreatment of excess sludge. The high-gravity field integrated device for strengthening the mass transfer efficiency is used for solid-liquid phase contact rotary mass transfer and reaction, sludge passes through a filter screen and then is mixed with ferrous-persulfate in a pipeline, then passes through a hollow rotating shaft outlet hole, and under the centrifugal force effect of a centrifugal impeller, the sludge is uniformly distributed in the reactor after colliding with concave-convex attachment plates on the inner wall of the reactor shell, and due to the centrifugal force, the collision shearing effect of the concave-convex plates and the coupled ferrous-persulfate oxidation effect, the mechanical, hydraulic and chemical comprehensive effect is formed, microbial cell wall breaking and cell dissolving are achieved, intracellular substances are dissolved out, and carbon source release of residual sludge is achieved. Kinetic energy consumption during operation of the reactor can be reduced, the problem of non-uniform mass transfer in a traditional reactor can be solved, and the device and the method have the characteristics of high efficiency, energy conservation and low-cost operation, and have an engineering application prospect in sludge hydrolytic 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 excess 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 supernatant...

Claims

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Application Information

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Patent Type & Authority Applications(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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