DE3732329A1 - Process for treating heavy-metal-containing waste waters - Google Patents

Process for treating heavy-metal-containing waste waters

Info

Publication number
DE3732329A1
DE3732329A1 DE19873732329 DE3732329A DE3732329A1 DE 3732329 A1 DE3732329 A1 DE 3732329A1 DE 19873732329 DE19873732329 DE 19873732329 DE 3732329 A DE3732329 A DE 3732329A DE 3732329 A1 DE3732329 A1 DE 3732329A1
Authority
DE
Germany
Prior art keywords
fly ash
waste water
metal
decreased
filter stages
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19873732329
Other languages
German (de)
Inventor
Des Erfinders Auf Nennung Verzicht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE19873732329 priority Critical patent/DE3732329A1/en
Publication of DE3732329A1 publication Critical patent/DE3732329A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
    • C02F1/685—Devices for dosing the additives
    • C02F1/687—Devices for dosing solid compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/008—Sludge treatment by fixation or solidification
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH

Abstract

The invention describes a process for treating heavy-metal-containing waste waters (effluents) which is characterised in that fly ash from coal combustion plants is added to the waste water, the pH of which is adjusted to above 8, the heavy metal concentrations are decreased to drinking water values and the COD value of below 100 mg/l is achieved. Furthermore, the process is characterised in that the residue after waste water treatment is deposited as leach-resistant bodies, the fly ash is used from individual electrostatic precipitator stages or in various mixtures of the filter stages with each other, in that portions of unburnt fuel of 1-20% are co-used, sewage sludges or other materials predominantly containing finely divided silicates, clays, mica etc. are co-used and the salt concentrations are decreased.

Description

Es gilt als bekannt, daß schwermetalhaltige Abwässer durch Zugabe von Kalk aufbereitet werden. Hierdurch werden die Schwermetalle als Hydroxide ausgefällt.It is known that wastewater containing heavy metals can be prepared by adding lime. Hereby the heavy metals are precipitated as hydroxides.

Nachteilig ist, daß der Kalk aufwendig aus dem Natur­ produkt Kalkstein gebrannt werden muß, daß ferner die Schlämme zur Sondermülldeponie entsorgt werden müssen und mit dem bekannten Verfahren keine Salze entfernt werden können.The disadvantage is that the lime from nature product limestone must be burned, that also the Sludges have to be disposed of as hazardous waste landfills and no salts are removed with the known method can be.

Die Erfindung hat sich deshalb zur Aufgabe gemacht, diese Nachteile zu vermeiden.The invention therefore has set itself the task to avoid these disadvantages.

Zur Lösung der Aufgabe lehrt die Erfindung, daß anstelle von Kalk Flugasche zur Abwasserbehandlung eingesetzt wird. Diese Flugasche fällt als zu entsorgendes Abfall­ produkt bei der Entstaubung von kohlegefeuerten Verbren­ nungsanlagen an. Die Zugabe der Asche zum Abwasser be­ wirkt eine Erhöhung des pH-Wertes und eine Ausfällung der Schwermetalle.To achieve the object, the invention teaches that instead of lime fly ash used for wastewater treatment becomes. This fly ash falls as waste to be disposed of product in the dedusting of coal-fired combustibles systems. Add the ash to the waste water increases the pH value and precipitates the heavy metals.

Überraschenderweise werden die Schwermetalle zu einem großen Teil in der Flugasche eingebunden, so daß die Schlämme nach der Aufbereitung des Abwassers ohne Ge­ fährdung der Umwelt abgelagert werden können. Surprisingly, the heavy metals become one large part in the fly ash, so that the Sludge after treatment of waste water without Ge endangering the environment.  

Das erfindungsgemäße Verfahren erlaubt weiterhin eine problemlose Beseitigung der Schlämme, da die Flugasche nach Fällung und Einbindung der Schwermetalle selbst erhärtet. Überraschenderweise reduziert sich auch der Salzgehalt des Abwassers an Nitraten, Ammoniumsalzen, Chloriden und Sulfaten durch die Flugaschebehandlung. Hierdurch erreicht die Abwasserqualität nach der Be­ handlung mit Flugasche wesentlich günstigere Werte als nach dem herkömmlichen Verfahren.The method according to the invention also allows one easy removal of the sludge since the fly ash after precipitation and incorporation of the heavy metals themselves hardened. Surprisingly, the Salinity of nitrates, ammonium salts, Chlorides and sulfates from fly ash treatment. As a result, the wastewater quality after Be trading with fly ash values much cheaper than according to the conventional method.

Ein weiterer überraschender Vorteil besteht darin, daß der CSB-Gehalt des Wassers durch Flugaschezugabe auf die vorgeschriebenen Werte gesenkt werden kann. Dies ge­ schieht durch die Feinanteile und die unverbrannten Bestandteile der Flugasche, die katalytisch und adsorp­ tiv wirken. Hierdurch wird die somit notwendige, auf­ wendige Oxidation oder der biologische Abbau des CSB- Wertes überflüssig.Another surprising advantage is that the COD content of the water by adding fly ash to the prescribed values can be reduced. This ge shoots through the fines and unburned Components of fly ash that are catalytic and adsorb act effectively. As a result, the necessary agile oxidation or biodegradation of the COD Worthless.

Erfindungsgemäß können die feinanteiligen Feststoffe durch Zugabe von Klärschlämmen, Tonen, Glimmern und ähnlichen Silikaten erhöht werden.According to the invention, the fine-particle solids by adding sewage sludge, clays, mica and similar silicates can be increased.

Claims (9)

1. Verfahren zur Aufbereitung von schwermetallhaltigen Abwässern, dadurch gekennzeichnet, daß Flugasche aus Kohleverbrennungsanlagen zum Abwasser gegeben wird.1. A process for the treatment of waste water containing heavy metals, characterized in that fly ash from coal-burning plants is added to the waste water. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der pH-Wert des Abwassers auf größer 8 eingestellt wird.2. The method according to claim 1, characterized in that the pH value of the wastewater is set to greater than 8. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Schwermetallkonzentrationen bis auf Trinkwasser­ werte herabgesetzt werden.3. The method according to claim 1, characterized in that the heavy metal concentrations except for drinking water values are reduced. 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der CSB-Wert von kleiner 100 mg/l erreicht wird.4. The method according to claim 1, characterized in that the COD value of less than 100 mg / l is reached. 5. Verfahren nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß der Rückstand nach Abwasseraufbereitung als auslaug­ fester Körper abgelagert wird.5. The method according to claim 1 to 3, characterized in that the residue leached out after wastewater treatment solid body is deposited. 6. Verfahren nach Anspruch 1 bis 5, dadurch gekennzeichnet, daß Flugasche aus einzelnen E-Filterstufen oder in ver­ schiedener Mischung der Filterstufen untereinander ein­ gesetzt wird. 6. The method according to claim 1 to 5, characterized in that that fly ash from individual E filter stages or in ver different mix of the filter stages is set.   7. Verfahren nach Anspruch 1 bis 6, dadurch gekennzeichnet, daß Anteile an unverbranntem Brennstoff von 1-20% mitbenutzt werden.7. The method according to claim 1 to 6, characterized in that that unburned fuel shares of 1-20% be shared. 8. Verfahren nach Anspruch 1-7, dadurch gekennzeichnet, daß Klärschlämme oder andere Stoffe mit vorwiegend fein­ teiligen Silikaten, Tone, Glimmer etc. mit verwendet werden.8. The method according to claim 1-7, characterized in that sewage sludge or other substances with predominantly fine partial silicates, clays, mica etc. with used will. 9. Verfahren nach Anspruch 1 bis 6, dadurch gekennzeichnet, daß die Salzkonzentrationen, z. B. Chlorid, Nitrat, NH4- Salze, abgesenkt werden.9. The method according to claim 1 to 6, characterized in that the salt concentrations, for. B. chloride, nitrate, NH 4 salts are lowered.
DE19873732329 1987-09-25 1987-09-25 Process for treating heavy-metal-containing waste waters Withdrawn DE3732329A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19873732329 DE3732329A1 (en) 1987-09-25 1987-09-25 Process for treating heavy-metal-containing waste waters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873732329 DE3732329A1 (en) 1987-09-25 1987-09-25 Process for treating heavy-metal-containing waste waters

Publications (1)

Publication Number Publication Date
DE3732329A1 true DE3732329A1 (en) 1989-04-13

Family

ID=6336863

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19873732329 Withdrawn DE3732329A1 (en) 1987-09-25 1987-09-25 Process for treating heavy-metal-containing waste waters

Country Status (1)

Country Link
DE (1) DE3732329A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4016468A1 (en) * 1990-05-22 1991-11-28 Passavant Werke METHOD AND SYSTEM FOR THE THERMAL DISPOSAL OF CLEANING SLAVES
DE4307468A1 (en) * 1993-03-10 1994-09-15 Wismut Gmbh Process for precipitation of heavy metals, uranium and toxic metals in the rehabilitation of mining installations, in particular from contaminated waters
WO1996038383A1 (en) * 1995-06-02 1996-12-05 Bernhard Zinke Process for purifying aqueous liquids contaminated with inorganic and/or organic pollutants
DE10107941A1 (en) * 2001-02-20 2002-09-05 Ebauchesfabrik Eta Ag Improving the quality of acidic water in e.g. ponds left after ceasing open-cast mining by treating with alkaline wastes and also air to raise the pH
EP2703361A1 (en) * 2005-06-24 2014-03-05 UPM-Kymmene Corporation Use of ash as an alternative alkalising agent
EP2927332A4 (en) * 2012-11-28 2016-08-10 Sumitomo Metal Mining Co Neutralization treatment method and neutralizing agent

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3039660A1 (en) * 1980-10-21 1982-04-29 Guenther Dr Heide METHOD FOR THE DAMAGED DEPOSIT OF THICKEN ACID ON LAND
DE3506550A1 (en) * 1985-02-25 1986-08-28 Heinrich 4250 Bottrop Becker Method and apparatus for the non-harmful dumping of substances which pose a threat to the environment by binding them with power station ash

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3039660A1 (en) * 1980-10-21 1982-04-29 Guenther Dr Heide METHOD FOR THE DAMAGED DEPOSIT OF THICKEN ACID ON LAND
DE3506550A1 (en) * 1985-02-25 1986-08-28 Heinrich 4250 Bottrop Becker Method and apparatus for the non-harmful dumping of substances which pose a threat to the environment by binding them with power station ash

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DE-Z: Chem.-Ing.Techn., 56, 1984, Nr.1, S.55 - 56 *
US-Z: Journal WPCF, S. 2157 - 2174 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4016468A1 (en) * 1990-05-22 1991-11-28 Passavant Werke METHOD AND SYSTEM FOR THE THERMAL DISPOSAL OF CLEANING SLAVES
DE4307468A1 (en) * 1993-03-10 1994-09-15 Wismut Gmbh Process for precipitation of heavy metals, uranium and toxic metals in the rehabilitation of mining installations, in particular from contaminated waters
DE4307468B4 (en) * 1993-03-10 2007-09-20 Wismut Gmbh Process for the precipitation of heavy metals, uranium and toxic metals in the rehabilitation of mining facilities, in particular contaminated waters
WO1996038383A1 (en) * 1995-06-02 1996-12-05 Bernhard Zinke Process for purifying aqueous liquids contaminated with inorganic and/or organic pollutants
DE10107941A1 (en) * 2001-02-20 2002-09-05 Ebauchesfabrik Eta Ag Improving the quality of acidic water in e.g. ponds left after ceasing open-cast mining by treating with alkaline wastes and also air to raise the pH
EP2703361A1 (en) * 2005-06-24 2014-03-05 UPM-Kymmene Corporation Use of ash as an alternative alkalising agent
EP2927332A4 (en) * 2012-11-28 2016-08-10 Sumitomo Metal Mining Co Neutralization treatment method and neutralizing agent

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8139 Disposal/non-payment of the annual fee