EP0057228A1 - Procede et dispositif pour l'epuration des eaux usees - Google Patents

Procede et dispositif pour l'epuration des eaux usees

Info

Publication number
EP0057228A1
EP0057228A1 EP81902309A EP81902309A EP0057228A1 EP 0057228 A1 EP0057228 A1 EP 0057228A1 EP 81902309 A EP81902309 A EP 81902309A EP 81902309 A EP81902309 A EP 81902309A EP 0057228 A1 EP0057228 A1 EP 0057228A1
Authority
EP
European Patent Office
Prior art keywords
separator
heat exchanger
solution
line
waste water
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Withdrawn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
EP81902309A
Other languages
German (de)
English (en)
Inventor
Helmut Apfelbaum
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
Publication of EP0057228A1 publication Critical patent/EP0057228A1/fr
Withdrawn legal-status Critical Current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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048—Purification of waste water by evaporation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/0094—Evaporating with forced circulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0018—Evaporation of components of the mixture to be separated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0036—Crystallisation on to a bed of product crystals; Seeding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0059—General arrangements of crystallisation plant, e.g. flow sheets
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06—Contaminated groundwater or leachate

Definitions

  • the invention relates to a method and a device for cleaning waste water.
  • waste water contaminated with inorganic substances such as sulfates (especially calcium sulfate), chlorides and heavy metals and other pollutants in solution.
  • inorganic substances such as sulfates (especially calcium sulfate), chlorides and heavy metals and other pollutants in solution.
  • the number of substances in solution, their concentration and their amount are usually not known, and these values can also vary widely. So far it has only been possible to analyze and then dispose of this waste water at great expense. So far, this waste water can only be disposed of at a very high cost, for example in incineration plants.
  • Another possibility of disposing of the waste water contaminated with inorganic pollutants is crystallization. According to the current state of the art, there are limits to disposal by crystallization.
  • the invention has for its object to provide a method and an apparatus for purifying wastewater, with which all accruing wastewater loaded with inorganic pollutants regardless of the pollutant concentrations or regardless of the balance of pollutants, which are subject to constant change can be disposed of.
  • the method according to the invention and the device according to the invention are designed in the manner characterized in the first method claim and the first device claim.
  • Figure 1 is a schematic representation of the device according to the invention.
  • Figure 2 is a schematic drawing of a plate heat exchanger as it is provided in the device according to the invention.
  • the device shown in Fig. 1 has a reservoir 2 for the waste water to be treated.
  • An inlet 4 is provided on the reservoir 2 for filling the reservoir with leachate or other inorganically contaminated waste water.
  • the storage container 2 is connected to a feed line 6 with a pump 8, the output of which is connected by an output line 10 to a connecting line 12 which on the one hand opens into the circulation circuit and on the other hand into the storage container.
  • a back pressure valve 13 is provided between the connection point of the outlet line 10 and the connection line 12 and the reservoir 2, through which the return flow of the waste water from the pump 8 is throttled into the reservoir 2 and thus enables the inflow of the waste water via the line 12 into the circulation circuit .
  • the back pressure valve 13 also makes it possible to feed several of the devices shown here in parallel from the storage container 2.
  • the circulation circuit has a plate heat exchanger 14, a tangential separator 16 and a pump 18.
  • the Plate heat exchanger 14 is connected to the tangential compressor 16 via a riser 20, and this is connected to the pump 18 through a drain line 22, the outlet line 24 of which leads back to the plate heat exchanger 14.
  • a sampling tap 26 with a valve 28 is provided on the circulation circuit downstream of the pump 18.
  • the vapor outlet 30 of the tangential separator 16 is connected via an inlet line 32 to a mechanical vapor compressor 34, the outlet line 36 of which leads to the steam inlet 38 of the plate heat exchanger 14.
  • the outlet of the steam flow path system of the plate heat exchanger 14 is a drain line 40.
  • the device also has a bypass line with a second, static separator 42.
  • the bypass line is provided by an inflow line 44 leading from a branch on the recirculation circuit to the separation chamber 46 of the separator 42 and also a solution drain line 48 which leads from the solution chamber 50 via a pump 52 back to the circulation circuit to one Point leads, which opens into the circulation circuit between the branch of the inflow line 44 and the plate heat exchanger 14.
  • the inflow line 44 also serves as a cooling line in which further amounts of solid precipitate out of the solution. To accelerate the separation, the inflow line 44 opens tangentially into the separator 42.
  • the static separator 42 is longer compared to the otherwise customary design, in that the ratio of diameter to height is about 1: 3, by a sufficient distance to separate solid and solution to obtain.
  • the solids are discharged from the separator 42 via a vertical screw 54 and a horizontal screw 56
  • Drying the solids is a dryer, for example a
  • Hot air belt dryer 5 , 8 is provided, from which the dried solids are discharged via a discharge 60.
  • the internal structure of the plate heat exchanger 14 is shown schematically in FIG. 2.
  • the vapor from the outlet line 36 is fed into the plate heat exchanger 14 through line 70 and exits the plate heat exchanger through line 72.
  • the waste water or the concentrated solution is fed into the plate heat exchanger via line 74 and leaves the plate heat exchanger via line 76.
  • the plate embossments of the plates are schematically indicated by hatching in FIG. 2.
  • the plates of the waste water is produced due to the high flow rate through the respective channels exceptionally high flow turbulence (Reynolds number R e> 2000) so as to flush out the channels from the solution entrained solid components.
  • the inflow of waste water into the circuit is regulated by a control device which consists of a level controller 92 on the tangential separator 16 and a valve 94 at the mouth of the connecting line 12 in the circulation circuit.
  • the level controller 92 senses the liquid level in the tangential separator 16 and opens the valve when the liquid level falls below a predetermined value, so that wastewater is replenished.
  • a temperature control device is provided which consists of a temperature controller 96 and a valve 98 which is located in a water supply line 100 leading to the drain line 36.
  • the vapor leaves the tangential separator 16 at a temperature of approximately 100 ° is brought to a temperature of approximately 160 ° C. in the vapor compressor 34 and regulated back down to approximately 120 ° C. by the temperature control device.
  • a density control In order to regulate the repulsion of the mixture of solution and solids from the circulation circuit, a density control is provided, which consists of a density controller 102 on the solution chamber 50 of the separator 42 and a valve 104 which is located in the inflow line 44.
  • the inflow into the separator 42 is regulated by the density control device as a function of the density of the solution in the separator 42, the density in the solution chamber of the separator 42 being regulated to approximately 1.25.
  • a live steam inflow control device which has a flow controller 106 at the vapor condensate outlet 40 and a valve 108 in a live steam supply line 110 which opens into the line 36.
  • This control device serves to reduce the supply of live steam which is necessary when the device starts up, if the supply of vapors from the vapour compressor 34 is sufficient to operate the plate heat exchanger 14. In other words, the live steam supply is throttled when the vapor condensate flows sufficiently.
  • the device described above works as follows.
  • the circulating circuit is filled with waste water, and live steam is fed via line 110 to the plate heat exchanger 14.
  • the wastewater heated in the plate heat exchanger 14 rises via the riser 20 into the tangential separator 16, where evaporation takes place through expansion.
  • the riser has the purpose to generate a back pressure of about 6 m water column in the plate heat exchanger 14, so that bubble formation in the plate heat exchanger 14 is prevented.
  • the solution is circulated and evaporated in the circulation circuit until the desired density of about 1.25 is reached. This corresponds approximately to a ratio of 1: 5 of the solids content to the solution content in the mixture, which is still flowable in this ratio.
  • the density is initially determined by taking samples through valve 28 and line 26.
  • a mixture of solution and solids is delivered to the separator 42 via the inflow line 44, and from then on the density control device takes over control of the repulsion of the mixture of solution and solids from the circulation circuit.
  • the density control device and the level control device establish an equilibrium, since the evaporation capacity of the system is correspondingly high.
  • the evaporation capacity is dimensioned such that the maximum evaporation capacity is equal to the feed-in capacity that the user of the device demands. For example, if the user requires the device to process 10 tons of water per hour, the maximum evaporation capacity is dimensioned to 10 tons of water per hour.
  • the level control device ensures that the liquid circuit in the system is constantly maintained, so that there is continuous operation if the interplay between the repulsion of solution and solids from the circulation circuit and the feeding of wastewater has been repeated at ever decreasing intervals, until a state of equilibrium is established with the density of the solution in the solution chamber 50.
  • This process removes the pollutants one after the other through an uncontrolled crystallization from the wastewater solution separated.
  • the solid components are separated, the substances of which have a low solubility and / or a high concentration in the solution.
  • the solid components which due to their too small amount or too great solubility do not yet precipitate out, remain in the device until they are sufficiently enriched in the solution that they also precipitate out. Therefore, all pollutant components are finally separated.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Crystallography & Structural Chemistry (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)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

Le procede d'epuration d'une eau polluee par des matieres en solution separables par cristallisation consiste a faire circuler la solution dans un echangeur de chaleur dans lequel on atteint la temperature de vaporisation, a envoyer la solution dans un separateur dans lequel la vaporisation s'effectue par expansion. La solution est ensuite renvoyee a l'echangeur de chaleur et les matieres solides precipitees par la concentration de la solution sont retirees de la circulation de liquide. L'installation pour la mise en oeuvre du procede comporte un echangeur de chaleur (14), un separateur (16) relie a l'echangeur, un dispositif d'extraction (42) et un moyen (48) de retour de la solution dans l'echangeur.
EP81902309A 1980-08-04 1981-08-04 Procede et dispositif pour l'epuration des eaux usees Withdrawn EP0057228A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3029541 1980-08-04
DE3029541A DE3029541C2 (de) 1980-08-04 1980-08-04 Verfahren und Vorrichtung zur Reinigung von Abwasser

Publications (1)

Publication Number Publication Date
EP0057228A1 true EP0057228A1 (fr) 1982-08-11

Family

ID=6108868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81902309A Withdrawn EP0057228A1 (fr) 1980-08-04 1981-08-04 Procede et dispositif pour l'epuration des eaux usees

Country Status (3)

Country Link
EP (1) EP0057228A1 (fr)
DE (1) DE3029541C2 (fr)
WO (1) WO1982000459A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2552340B1 (fr) * 1983-09-28 1988-02-19 Swenson Sa Procede et dispositif de cristallisation a recyclage axial de niveau reglable
DE3545624A1 (de) * 1985-12-21 1987-06-25 Krupp Gmbh Verfahren zur vakuum-verdampfungskristallisation
DE10355670B4 (de) * 2003-11-28 2005-12-08 Infineon Technologies Ag Verfahren zur Ansteuerung eines Schalters in einer Leistungsfaktorkorrekturschaltung und Ansteuerschaltung
US8052763B2 (en) * 2008-05-29 2011-11-08 Hpd, Llc Method for removing dissolved solids from aqueous waste streams
NL2008728C2 (en) * 2012-04-27 2013-10-29 Dutch Water Technologies B V System and method for recovering salts from a liquid flow.
CN105258349A (zh) * 2015-10-28 2016-01-20 成都兴业雷安电子有限公司 一种高效率电加热气化结构
CN105258348A (zh) * 2015-10-28 2016-01-20 成都兴业雷安电子有限公司 电加热气化机构
CN112939165B (zh) * 2021-01-27 2023-07-07 厦门澄志精密科技有限公司 一种金属热处理废水的净化装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT132183B (de) * 1928-10-19 1933-03-10 Otto Buehring Verfahren zur Gewinnung von destillatähnlichem Speisewasser.
DE580928C (de) * 1929-12-23 1933-07-19 Metallgesellschaft Akt Ges Verfahren zum Eindampfen von Fluessigkeiten
DE1018802B (de) * 1941-04-07 1957-10-31 Cesare Piccardo Verfahren und Vorrichtung zur thermischen Enthaertung von Kesselspeisewasser
DE861539C (de) * 1947-12-03 1953-06-25 Rosenblads Patenter Ab Verfahren zum Eindampfen von Verkrustungen bildenden, insbesondere gipshaltigen Fluessigkeiten in Mehrstufenverdampfern
DE906691C (de) * 1951-01-09 1954-03-18 Metallgesellschaft Ag Verfahren zum Eindampfen von Fluessigkeiten

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8200459A1 *

Also Published As

Publication number Publication date
DE3029541C2 (de) 1983-12-29
DE3029541A1 (de) 1982-02-18
WO1982000459A1 (fr) 1982-02-18

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19821011