Method and equipment for processing waste water containing sulphides and ammonium

A sulfide and wastewater technology, applied in the field of wastewater or reflux, leachate treatment, and condensate, can solve the problems of incomplete oxidation of sulfide, consumption of alkalinity, alkalinity and even nitrate limitations, etc.

Inactive Publication Date: 2010-01-13
DEGREMONT SOC DITE
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0027] This method is limited in terms of investment cost as it requires large quantities of expensive carrier materials
[0028] The limitation of this treatment scheme is based on the amount of sulfide oxidized by autotrophic denitrification (which consumes alkalinity)
Since the proposed operating mode consumes alkalinity (autotrophic nitrification in the aeration tank + autotrophic denitrification in the anoxic tank), anoxic media at alkalinity or even There will be restrictions on nitrates
Oxidation of sulfides is therefore not complete
[0029] In addition, the production of volatile fatty acids in the first anaerobic reactor also consumes alkalinity, which is more unfavorable for the sulfide oxidation reaction in the anoxic second reactor

Method used

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  • Method and equipment for processing waste water containing sulphides and ammonium
  • Method and equipment for processing waste water containing sulphides and ammonium

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Embodiment Construction

[0046] See attached figure 1 , the device of the invention for the treatment of waste water containing sulfides and ammonium (according to a continuous stream) can be seen. This plant comprises an anoxic reactor 1, which is divided into a heterotrophic tank 1a followed by an autotrophic tank 1b. The two tanks 1a and 1b are separate and the discharge leaving tank 1a is sucked by pumping means and sent to tank 1b.

[0047] Tank 1a receives a stream Q of wastewater containing carbon, sulfide and ammonium. In each of the tanks 1a, 1b a stirring device Aa, Ab is provided. No air or oxygen is injected into these slots.

[0048] Heterotrophic and autotrophic bacteria are naturally present in the waste water and in the tanks 1a, 1b in the form of episomal cultures.

[0049]Since the anoxic tank 1a receives a stream Q containing organic carbon, heterotrophic bacteria multiply rapidly in this tank 1a, while autotrophic bacteria multiply much more slowly under these conditions. The ...

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Abstract

The invention relates to a method for treating waste water containing sulphides and ammonium, in particular waste water from an urban or industrial origin or digestion feedbacks, condensates and lixiviates. The waste water is first subjected to an anoxic processing (1) in a free-culture biological manner, wherein, in a first step (1a), the organic carbon is essentially removed by heterotrophic bacteria and, during a second step (1b) separate from the first, the sulphides are oxidised in a biological manner by autotrophic bacteria with nitrites or nitrates reduction. The effluent from the second step (1b) is submitted to a free-culture aerobic biological treatment (2) for converting the ammonium into nitrates. The conjunction with a sequential aerobic biological reactor (9) compensates a potential nitrate deficit.

Description

technical field [0001] The present invention relates to a method for the treatment of waste water containing sulphide and ammonium, especially waste water or retours de digestions, condensates, leachates of municipal or industrial origin. Background technique [0002] Wastewater, especially wastewater containing carbon, nitrogen and sulfur in the form of various compounds, can be chemically treated by various methods. All physicochemical treatments consist in separating the compounds of these elements from a liquid phase in order to concentrate them in another phase. This relates in particular to methods of stripping (removal of gas from water using entrained gas), reverse osmosis, distillation, chemical precipitation or catalytic oxidation, which are costly to implement and operate. Removal of these compounds via biological pathways is an optional treatment option. [0003] Biological treatment of nitrogen and carbon [0004] Carbon-containing pollutants and nitrogen-con...

Claims

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Application Information

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IPC IPC(8): C02F3/00C02F3/30
CPCC02F2209/15C02F2101/101C02F2209/44C02F2209/08C02F2101/16C02F2209/005C02F2209/06C02F2209/40C02F3/302C02F3/006C02F3/1263C02F3/345C02F2209/26C02F2209/20Y02W10/10
Inventor A·冈萨雷斯奥斯比纳M·巴隆
Owner DEGREMONT SOC DITE
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