Sludge hot digesting apparatus for preparing biological solid

A biosolid, thermal digestion technology, applied in the field of environmental protection and comprehensive utilization of resources, achieves the effects of small size, fully automated equipment and system operations, and reduced stirring power

Inactive Publication Date: 2009-06-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process is still in the experimental stage, and many of its mechanisms have not been clarified. If large-scale promotion is required, further in-depth research on its mechanism and reaction equipment is required.

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  • Sludge hot digesting apparatus for preparing biological solid
  • Sludge hot digesting apparatus for preparing biological solid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Using a reaction tank for sludge high-temperature aerobic automatic defoaming reaction:

[0042] The sewage is taken from a sewage treatment plant, the moisture content of the sludge is 95.2%, the pH value is 7.21, and the VSS is 2.95×10 4 mg / L, COD is 18000mg / L, DO is 2.1mg / L, ORP is -246mV. A reaction tank is used to carry out the high-temperature aerobic automatic defoaming reaction of sludge. The intermittent sludge feeding method is adopted. The sludge feeding amount is 100kg / h. The tank water bath temperature was adjusted to 60°C, the stirring speed was 200r / min, and the aeration rate was 0.55 (V air / V sludge / min). After running for 8 days, samples were taken and analyzed at different positions (upper, middle and lower liquid levels of the sludge) in the reaction tank, and the average value was taken. The pH value of the sludge was 7.0, and the VSS was 1.75×10 4 mg / L, VSS degradation rate is 40.7%; COD is about 4500mg / L, COD removal rate is about 75%; DO concent...

Embodiment 2

[0044] Using two reaction tanks in series to carry out the sludge self-heating and automatic defoaming high-temperature aerobic digestion process:

[0045] The sludge is taken from a sewage treatment plant, the moisture content of the sludge is 97%, the initial pH value is 7.2, and the concentration of volatile suspended solids (VSS) is 3.86×10 4 mg / L, the chemical oxygen demand (COD) is 15000mg / L, the dissolved oxygen concentration (DO) is 2.5mg / L, and the oxidation-reduction potential (ORP) is -215mV. Since the sludge concentration does not meet the sludge inlet standard for autothermal high-temperature aerobic digestion, the sludge is firstly concentrated. After concentration, the moisture content of the sludge is about 91.8%, which meets the sludge inlet standard. Intermittent mud feeding is adopted, 5t of mud is fed at one time, and the two reaction tanks are operated in series. Part of the sludge (0.1%-2% of the amount of mud feeding) from the reaction tank 2 is returned...

Embodiment 3

[0047] Reaction tank 1 performs high-temperature anaerobic automatic defoaming and digestion treatment of sludge, and reaction tank 2 performs high-temperature aerobic automatic defoaming and digestion treatment. The two reaction tanks operate in series:

[0048] Sewage is taken from a sewage treatment plant, the moisture content of the sludge is 96%, the pH value is 7.25, and the VSS is 3.95×10 4 mg / L, COD is 17000mg / L, DO is 2.3mg / L, ORP is -238mV. The reaction tank 1 carries out the high-temperature anaerobic automatic defoaming digestion reaction of the sludge; the reaction tank 2 carries out the high-temperature aerobic automatic defoaming digestion reaction of the sludge. The continuous mud feeding method is adopted, the mud feeding amount is 200kg / h, and the two reaction tanks are operated in series. Part of the sludge (0.1%-2% of the mud feeding amount) from the reaction tank 2 is returned to the reaction tank 1, and the reaction tank 1. The temperature of the water b...

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Abstract

The sludge hot digesting apparatus for preparing biological solid includes one sealed reaction tank possessing one water bath jacket with electrically heating pipe and one sludge discharge port in the bottom; one reaction tank top cover with sludge inlet and gas collecting port; one stirring paddle; and one aerating head. There is defoaming filament fixed onto the electric wire connected between the stirring paddle and the stirring motor. There may be also one other reaction tank connected serially to the first one. Inside the apparatus, may be realized aerobic sludge digestion, anaerobic / aerobic sludge digestion, self-heating aerobic sludge digestion and two section high temperature aerobic / medium temperature anaerobic sludge digestion. The present invention has high reaction rate and efficiency.

Description

technical field [0001] The invention relates to the fields of environmental protection and resource comprehensive utilization, in particular to a device for preparing biological solids by thermal digestion of sludge. Background technique [0002] The principle of sludge thermal digestion technology is the same as that of traditional sludge digestion technology, which is to achieve the stabilization and harmlessness of sludge through the degradation of organic matter by microorganisms. However, compared with the traditional sludge digestion process, the sludge thermal digestion process can produce A-grade biosolids stipulated by the US EPA, which has powerful digestion functions, multiple digestion functions, less system investment, less energy consumption during operation, and short digestion time. And smaller digester volume and other advantages. [0003] The existing sludge digestion processes mainly include the following types: [0004] (1) Conventional aerobic digestio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/02
CPCY02W10/20
Inventor 黄少斌张峥嵘
Owner SOUTH CHINA UNIV OF TECH
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