EP1049652A1 - Procede de conditionnement pour la deshydratation des boues de curage - Google Patents

Procede de conditionnement pour la deshydratation des boues de curage

Info

Publication number
EP1049652A1
EP1049652A1 EP99902534A EP99902534A EP1049652A1 EP 1049652 A1 EP1049652 A1 EP 1049652A1 EP 99902534 A EP99902534 A EP 99902534A EP 99902534 A EP99902534 A EP 99902534A EP 1049652 A1 EP1049652 A1 EP 1049652A1
Authority
EP
European Patent Office
Prior art keywords
sludge
container
conditioning
sewage sludge
metering
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.)
Ceased
Application number
EP99902534A
Other languages
German (de)
English (en)
Inventor
Heinz-Günther WEISSENBERG
Thomas Melin
Bernhard Vosteen
Joachim Lemke
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.)
Bayer AG
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Publication of EP1049652A1 publication Critical patent/EP1049652A1/fr
Ceased 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
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/06—Treatment of sludge; Devices therefor by oxidation
    • 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
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
    • C02F11/145—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances using calcium compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/026—Fenton's reagent

Definitions

  • VKS VKS
  • secondary sludge Excess activated sludge ÜSS.
  • Some of the sludge is subjected to digestion in order to reduce / use the organic sludge fraction and, even after it has thickened, is present as very water-rich raw sludge with low dry matter contents of, for example, only 4 to 5% by weight.
  • In Germany there are approx. 80 million t of raw sludge per year, corresponding to approx. 3.6 million t of dry matter per year.
  • the invention aims at a significant improvement in the dewatering of industrial and municipal sewage sludge and relates in particular to a new process for sewage sludge conditioning as an important process step before the actual sewage sludge dewatering.
  • Any sewage sludge conditioning - like conventional organic conditioning with polyelectrolytes or conventional inorganic conditioning with lime - is intended to ensure or improve the drainability of the sewage sludge (which is still rich in organic matter even after digestion), because it would be without targeted conditioning difficult to drain.
  • the aim of the invention is a novel sewage sludge conditioning which leads to a considerable improvement in the subsequent sewage sludge dewatering.
  • Every sludge treatment today has the goal of recycling or disposal and generally involves the process-related sub-steps of flocculation / thickening, scum reduction (such as digestion, hydrolysis) and / or - directly - flocculation / thickening, conditioning, dewatering, drying and incineration.
  • Sewage sludge incineration plants usually include the residual drying of the mechanically dewatered sewage sludge (such as fluidized bed furnaces) 2 and deck ovens).
  • the final goal of sludge treatment is usually sewage sludge mineralization by incineration, according to TA waste.
  • dewatered sludge The goal of many current work on conditioning with regard to dewatering and dewatering itself is the highest possible dewatered sludge (see e.g. [1]).
  • a main starting point for improvements in mechanical dewatering is the upstream conditioning of the organic-rich sludge.
  • the conditioning must be tailored precisely to the sludge itself in the individual case and also to the drainage technology used (such as decanters, screen burners, chamber filter presses, membrane filter presses).
  • Conventional conditioning is preferably carried out with organic conditioning aids such as e.g. Polyelectrolytes (PE), but not infrequently with inorganic conditioning aids such as hydrated lime and / or other substances that promote dewatering, e.g. Coal dust or fly ash from coal combustion.
  • organic conditioning aids such as e.g. Polyelectrolytes (PE)
  • inorganic conditioning aids such as hydrated lime and / or other substances that promote dewatering, e.g. Coal dust or fly ash from coal combustion.
  • KH conditioning aids
  • the KH loading of the original sludge dry substance yKH (as the ratio KH / STSo) is e.g. B. set to values of 0.25 kg KH / kg STSo, often much higher. This increase in the original amount of sludge dry matter by 25% and more is a (very 3
  • the so-called water loading yH 2 O of the original sludge dry substance, ie the ratio yH 2 O water / STSo, appears to be much more suitable for procedural assessments of drainage. 4
  • Conditioning not only has a positive impact on the level of dewatering achieved, but also on the rate of dewatering (e.g. filtration times, pressing times) and thus the performance of a dewatering machine used.
  • Elevated temperatures eg 60 to 90 ° C
  • B. are connected to COD, BOD, NH 4 +, accelerate the oxidation.
  • a "neutralization” as a re-increase of the pH with eg NaOH, Mg (OH) 2 , or Ca (OH) 2 in the vicinity of the neutralization point (avoidance of corrosion) and beyond that to a final pH of max 8.5, the latter with the aim of reintegrating heavy metals dissolved in the previously acidic medium and / or with the aim of reducing the COD / BOD back-loading of the later filtrate.
  • the invention is based on the object of making the previously only partially used positive effects of acidic oxidative conditioning fully usable in order to considerably improve the dewatering results.
  • Lime conditioning on chamber filter presses KFP dewatered sewage sludge filter cake could be burned, whereas according to TA waste from April 1997 all sewage sludge had to be burned.
  • the sewage sludge filter cake previously dewatered on chamber filter presses had an average of approx. 34% by weight TS + with a lime hydrate loading yKH of approximately 0.25 to 0.50 kg KH / kg STSo, corresponding to one
  • the new process is based on acidic oxidative preconditioning, in which the sewage sludge is first acidified and then - at a pH ⁇ 5 with the addition of divalent iron ions (Fe ++ ) and a substoichiometric amount of hydrogen peroxide (Fenton reagent) - Partial catalytic oxidation takes place;
  • This (in principle known) preconditioning is followed by a defined postconditioning with alkaline earths according to the novel method, after which the mechanical dewatering takes place in the last step.
  • the organic-rich sewage sludge is subjected to acidic oxidative preconditioning, in which acidification of the sewage sludge with HC1 and - at a pH ⁇ 5 - a catalytic partial oxidation with the addition of divalent iron ions Fe ++ and a substoichiometric amount of hydrogen peroxide H 2 O 2 is done.
  • the process is advantageously carried out in such a way that hydrochloric acid is used for the acidification and the metering in is adjusted so that the pH of the acidified sewage sludge is between 3 and 4.
  • a FeCl 2 solution is preferably used as the catalyst for the partial oxidation, the solution of which is already added to the acidified and degassing sewage sludge, the amount of FeCl 2 added being of the order of 0.75 kg FeCl 2 (100%) / kg H 2 O 2 (100%), corresponding to an H 2 O 2 / Fe ++ molar ratio of 5: 1, until 1 kg FeCl 2 (100%) / kg H 2 O 2 (100%) is set.
  • the process is preferably carried out in such a way that in the partial oxidation so much hydrogen peroxide is metered in that a redox potential of 200 mV to 500 mV, preferably from 350 mV to 450 mV, is maintained in the oxidizing sewage sludge.
  • the partial oxidation thus brought about at pH values from 3 to 4 proceeds quickly even at relatively low temperatures in the range from 15 ° C to 40 ° C and is therefore preferably carried out between 20 ° C and 30 ° C, i.e. elevated temperatures are not required.
  • a preferred embodiment of the method also consists in the fact that in the inorganic post-conditioning so much calcium hydroxide is added that the pH of the post-conditioned sewage sludge is at a predetermined target value in the range of at least 9 to a maximum of 11.
  • the sewage sludge is acidified in two containers connected in series, the pH in the second container being kept at a predetermined desired value in the range from 3 to 4 by adjusting the metered addition of hydrochloric acid to the first container.
  • the partial oxidation can advantageously also be carried out in two containers connected in series, the redox potential in the second container being kept at a predetermined setpoint in the range from 200 mV to 500 mV by regulating the hydrogen peroxide metering into the container.
  • the inorganic post-conditioning can advantageously also be carried out in two containers connected in series, the pH in the second container being kept at a predetermined desired value in the range from 9 to 11 by regulating the addition of calcium hydroxide to the first container.
  • the new process consists of the following individual steps:
  • the process was carried out with various non-fouled, industrial sewage sludge from two plants, both in the laboratory and long-term (3 weeks at 24 h / d) on a fully continuously operated pilot plant (throughput 70 kg raw sludge / h) using pilot plant filter presses (KFP and MFP) with 0.1 m 2 filter area) and for 3 weeks daily on a batch-operated semi-technical operating system (50 m container) using an operating press (KFP with 120 m 2 filter area) or a mobile semi-technical press (KFP and MFP with 1, 76 m 2 filter area) examined and tested.
  • the high efficiency of the process is based in part on the dissolution of the carbonates contained in the sludge, in part on the oxidative lysis of bacterial cells and in part on the dissolution of slimy gel structures which otherwise make filtration very difficult, but not least on the combination of the acidic oxidative known in principle Pre-conditioning with the defined lime post-conditioning as an additional drainage aid.
  • Acidification takes place with hydrochloric acid (HC1) instead of the usual sulfuric acid in order to avoid later gypsum precipitation.
  • the acid consumption depends on the carbonate and hydroxide content of the raw sludge. For a typical industrial raw sludge, approx. 100 g 100% HC1 per kg STSo are required. With a higher carbonate content, approx. 120 or 150 g of 100% HC1 per kg STSo are required.
  • the HCl should be added in the pipeline before the container (s) required for pH adjustment during acidification in order to facilitate the subsequent CO 2 degassing.
  • the residence time required for homogenization and sufficient carbonate dissolution is approximately 20 minutes with a narrow residence time spectrum.
  • a cascade connection with sufficient inertia has proven itself for pH control, just like after adding peroxide. No dry matter freight measurement is required for HCl metering. Instead, pH control is sufficient.
  • degassing nozzles are provided or separate degassing devices (eg degassing cyclone in a piping system) are used, with which extensive degassing takes place.
  • the amount of Fe ++ required corresponds to the order of addition of
  • yKH 0.1 to 0.12 kg Ca (OH) 2 / kg STSo are required, ie significantly less than with pure conventional lime conditioning (yKH> 0.25 kg Ca (OH) 2 / kg STSo).
  • the lime addition is pH controlled. With this pH control it has to be taken into account that the pH value only sets after a certain dwell time. A control pH of 10 was used in the first stage of the two-stage liming in the pilot plant.
  • H 2 O 2 exposure arises through the maintenance of an optimal sludge-dependent redox potential of 200 to 300 mV with a lower excess proportion of the raw sludge or up to 500 mV in the case of excess-rich raw sludge.
  • the process according to the invention is particularly suitable for the dewatering of organically safe sludges, in particular for the dewatering of sewage sludges with medium and higher microbial sludge contents or for sludges with sludge contents of other animal origin (e.g. gelatin-containing sludges).
  • the main field of application is in the wide range of sewage sludge from industrial and municipal wastewater treatment using aerobic and / or anaerobic treatment stages.
  • Patent DE 2838386 C2 [2]
  • FIG. 1 shows a schematic flow diagram of a plant with only one mixing tank in each case in the acidification, oxidation and lime post-conditioning,
  • FIG. 2 shows a schematic flow diagram of a plant, each with two mixing tanks connected in series in the acidification and oxidation,
  • FIG. 3 Schematic diagram of a possible plant modification using static mixers for acidification and the (beginning) oxidation and with otherwise only one mixing tank for the (remaining) oxidation and for the lime conditioning.
  • FIGS. 1 and 2 the degassing nozzle on the containers for discharging the carbonate CO 2 released during acidification was not shown separately. Accordingly, the depiction of a degassing cyclone in the outlined pipeline mixer system was omitted in FIG. 3.
  • the average residence time in the individual containers is approximately 2 hours in each case in a process design according to FIG. 1.
  • the previously thickened raw sludge (so-called mixed sludge, consisting of VKS and ÜSS, for example 50 g STSo / kg raw sludge) in an amount of 100 t / h (corresponding to 5 t
  • the partial oxidation of the acidified sewage sludge by H 2 O 2 from the H 2 O 2 storage container 10 takes place in the reaction container 5, which is catalysed with Fe ++ .
  • the H 2 O 2 quantity flow metered into the container 5 is self-regulating in this way due to the regulation 8a that in the reaction vessel 5 a redox potential of, for example, 350 mV (detected there with the measuring electrode 9) (medium in the case of a mixed sludge)
  • the associated FeCl 2 catalyst solution is already metered from the FeCl 2 storage tank 6 via line 7 with the raw sludge stream, ie upstream of the agitator tank 1, to the acidification stage.
  • a proportional control 8a / 8b is provided, which adjusts the FeCl 2 mass flow proportionally to the metered H 2 O 2 mass flow.
  • the H 2 O 2 flow rate is approx. 150 kg H 2 O 2 solution (50%) / h.
  • the FeCl 2 flow rate is approx. 280 kg FeCl 2 solution (20%) / h.
  • the oxidation in the reaction vessel 5 takes place at atmospheric pressure (1 bar) and a temperature of 20 to 30 ° C.
  • the partially oxidized sewage sludge leaves the reaction tank 5 via the line 12 and is then fed to the tank 13 for the lime post-conditioning.
  • the lime milk (calcium hydroxide suspension) has e.g. a concentration of 20% by weight
  • the dosing rate of lime milk is 3000 kg Ca (OH) 2 suspension / h, corresponding to 600 kg Ca (OH) 2 / h.
  • the STSo volume flow discharged from the container 13 with the conditioned sewage sludge is due to the outgassing, oxidation and dissolving processes
  • the conditioned sludge of approx. 104 t / h is finally fed into filter presses (not shown here) for dewatering. It can be z. B. are chamber filter presses or membrane filter presses.
  • Filter cake has a dry matter content of approx. 45% by weight. In the case of MFP dewatering, a dry matter content of approx. 48% by weight is achieved.
  • the conditioning system according to FIG. 2 - also designed for fully continuous operation - comprises, in contrast to the system according to FIG. 1, two tanks connected in series in the acidification and in the oxidation, ie the acidification takes place in the two reaction tanks la and lb and the catalyzed one Partial oxidation takes place in the two containers 5a and 5b.
  • the HCl metering is carried out analogously to FIG. 1.
  • the pH value in container 1b as the target control variable (pH electrode 4b) leads the pH value in container 1a (pH electrode 4a) as the intermediate control variable of the dose pump (in the manner of a cascade control ).
  • the redox potential in container 5b leads the redox potential in container as the target control variable (measuring electrode 9b) 5a (measuring electrode 9a) as an intermediate controlled variable of the Dosie ⁇ umpe.
  • the associated FeCl 2 catalyst solution is in turn fed to the acidification stage (in front of tank 1a); Here, too, they are dosed proportionally to the self-regulating H 2 O 2 flow rate (proportional regulation 8a / 8b).
  • the required average residence time in the containers 4a and 4b as well as 5a and 5b is only approx. 20 min in each case in a process design according to FIG. 2.
  • the lime post-conditioning takes place in FIG. 2, as in FIG. 1, in only one large container 13 with an average residence time of approximately 2 hours. If there is no stacking container in front of the downstream filter presses, this stage should also consist of two smaller containers connected in series with the appropriate regulation of the lime milk metering.
  • FIG. 3 shows a conditioning system that has been modified in a corresponding manner, but is in principle constructed similarly to a system according to FIG. 1.
  • the raw sludge is not acidified in one container, but in one 21 first static mixer 19, correspondingly also the FeCl 2 mixing in a static mixer 20.
  • hydrogen peroxide is metered in and mixed in the further static mixer 21 with the acidified, catalyst-containing sewage sludge, where the partial oxidation begins.
  • the after-reaction tank 22 serves to ensure that the partial oxidation comes to an end in accordance with the H 2 O 2 supply provided.
  • the partially oxidized sewage sludge is then mixed with lime milk in the container 23 (analogous to FIG. 1) and then fed to a dewatering machine.
  • the simplified process variant in the modified version according to FIG. 3 possibly without regulations in the individual stages, i.e. if necessary operated with fixed dosing quantities, is possible for raw sludges in terms of quantity and composition

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Treatment Of Sludge (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

L'invention concerne un procédé pour déshydrater des boues de curage, dans lequel un préconditionnement oxydatif acide est associé à un post-conditionnement inorganique. Le préconditionnement implique une acidification des boues de curage et une oxydation partielle catalytique par adjonction d'une quantité hypostoechiométrique de peroxyde d'hydrogène et d'ions fer à un pH </=5. Ensuite, un post-conditionnement inorganique est effectué, dans lequel les boues de curage acidifiées et partiellement oxydées sont mélangées avec une base alcalino-terreuse. Lors de ce post-conditionnement inorganique, une quantité suffisante d'hydroxyde de calcium (Ca(OH)2) est ajoutée pour que le pH des boues de curage blanchies se situe dans la plage de 9 au minimum à 11 au maximum, pour ensuite procéder à la déshydratation mécanique des boues de curage conditionnées.
EP99902534A 1998-01-22 1999-01-12 Procede de conditionnement pour la deshydratation des boues de curage Ceased EP1049652A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19802238A DE19802238A1 (de) 1998-01-22 1998-01-22 Kombiniertes Konditionierungsverfahren zur Klärschlammentwässerung
DE19802238 1998-01-22
PCT/EP1999/000135 WO1999037585A1 (fr) 1998-01-22 1999-01-12 Procede de conditionnement pour la deshydratation des boues de curage

Publications (1)

Publication Number Publication Date
EP1049652A1 true EP1049652A1 (fr) 2000-11-08

Family

ID=7855291

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99902534A Ceased EP1049652A1 (fr) 1998-01-22 1999-01-12 Procede de conditionnement pour la deshydratation des boues de curage

Country Status (7)

Country Link
US (1) US6368511B1 (fr)
EP (1) EP1049652A1 (fr)
JP (1) JP2002500953A (fr)
AU (1) AU2278999A (fr)
CA (1) CA2318092A1 (fr)
DE (1) DE19802238A1 (fr)
WO (1) WO1999037585A1 (fr)

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Also Published As

Publication number Publication date
WO1999037585A1 (fr) 1999-07-29
US6368511B1 (en) 2002-04-09
DE19802238A1 (de) 1999-07-29
CA2318092A1 (fr) 1999-07-29
AU2278999A (en) 1999-08-09
JP2002500953A (ja) 2002-01-15

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