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Method and arrangement for wastewater treatment

A sewage treatment and sewage technology, applied in water/sewage treatment, degassed water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as poor effect, limited solid concentration, etc., and achieve high gas or methane production , the effect of improving efficiency

Pending Publication Date: 2017-05-31
AWAMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heat transfer by indirect means is clearly disadvantageous and less effective, and also has the disadvantage that it severely limits the maximum possible solids concentration in the sludge
Despite the advantages of direct steam injection during the thermal hydrolysis step in wastewater treatment, these proposals have consistently encountered practical problems and have not been implemented to the desired extent

Method used

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  • Method and arrangement for wastewater treatment
  • Method and arrangement for wastewater treatment
  • Method and arrangement for wastewater treatment

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Embodiment Construction

[0066] exist figure 1 In order to illustrate the invention, the method sequence is described in a schematic and particularly simplified view. This is an embodiment that also already includes some non-obligatory method steps in order to be able to illustrate the general sequence in a particularly simple manner.

[0067] In a first method step, sludge is conveyed, which sludge is obtained from sewage and can be preclarified beforehand, possibly also activated and reclarified.

[0068] The sewage may be municipal sewage, but also sewage from industrial establishments, such as the sugar industry.

[0069]The sludge from pre-clarification 0 and possibly other stages is thus fed to the hydrolysis unit 8 in the form of residual sludge or pipeline sludge. Here, thermal hydrolysis takes place in a hydrolysis reactor.

[0070] Thermal hydrolysis is a proven treatment method for sludge contained eg in sewage and improves the decay and dewatering of sludge. Here, the hydrolysis temper...

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Abstract

The invention relates to a method and an arrangement for wastewater treatment, in which at least portions of the sewage sludge contained in the wastewater (0) are subjected to a hydrolysis (8). The hydrolysis (8) is carried out as a thermal hydrolysis. After the hydrolysis step (8), a drying process is (19) carried out. The drying process (19) is a process operating with positive pressure in the steam region. At least parts of the steam resulting from the drying process (19), which operates with positive pressure, are fed (20) to the portions of the sewage sludge in the thermal hydrolysis (8).

Description

technical field [0001] The present invention relates to a method for sewage treatment, in which method at least part of the sludge contained in the sewage is subjected to hydrolysis, the hydrolysis being performed as thermal hydrolysis, and drying being carried out after the hydrolysis step. [0002] The invention also relates to a system for sewage treatment with a hydrolysis device for hydrolytic treatment of sludge and a dryer for drying the sludge. Background technique [0003] Sludge is often accumulated during sewage treatment. Sludge is by no means merely an unfavorable by-product that must be removed, but rather constitutes a plant nutrient carrier due to its organic content as a valuable energy carrier and due to the phosphate and nitrogen contained therein. [0004] The energy content of the sludge can be utilized on the one hand by decay and reuse of the accumulated methane-containing biogas, but also on the other hand by combustion of the dried sludge and reuse ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/06C02F11/12C02F11/16C02F11/18C02F1/52
CPCC02F1/5254C02F11/04C02F11/06C02F11/121C02F11/16C02F2101/105C02F2301/063Y02W10/40C02F11/18C05B5/00C05B17/00C05C11/00C05D9/00Y02E50/30Y02W10/20C02F11/13C02F1/20C02F11/008C02F2101/16C02F2301/066C02F2303/10
Inventor M·西弗斯
Owner AWAMA
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