PL139584B1 - Method of treating industrial waste waters containing complex salts of heavy metals - Google Patents
Method of treating industrial waste waters containing complex salts of heavy metals Download PDFInfo
- Publication number
- PL139584B1 PL139584B1 PL1983240123A PL24012383A PL139584B1 PL 139584 B1 PL139584 B1 PL 139584B1 PL 1983240123 A PL1983240123 A PL 1983240123A PL 24012383 A PL24012383 A PL 24012383A PL 139584 B1 PL139584 B1 PL 139584B1
- Authority
- PL
- Poland
- Prior art keywords
- sludge
- acid
- water
- suspension
- sulfuric acid
- Prior art date
Links
- 229910001385 heavy metal Inorganic materials 0.000 title claims description 16
- 150000003839 salts Chemical class 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 11
- 239000010842 industrial wastewater Substances 0.000 title 1
- 239000010802 sludge Substances 0.000 claims description 30
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000000725 suspension Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 7
- 239000010985 leather Substances 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 5
- 239000000920 calcium hydroxide Substances 0.000 claims description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 5
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 5
- 150000002500 ions Chemical class 0.000 claims description 5
- 239000011343 solid material Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 150000007522 mineralic acids Chemical class 0.000 claims description 4
- 239000010865 sewage Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 238000010306 acid treatment Methods 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 2
- 235000008180 Piper betle Nutrition 0.000 claims description 2
- 240000008154 Piper betle Species 0.000 claims description 2
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 2
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 239000004571 lime Substances 0.000 claims description 2
- FWFGVMYFCODZRD-UHFFFAOYSA-N oxidanium;hydrogen sulfate Chemical compound O.OS(O)(=O)=O FWFGVMYFCODZRD-UHFFFAOYSA-N 0.000 claims description 2
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 229910001430 chromium ion Inorganic materials 0.000 description 4
- 239000011368 organic material Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910021432 inorganic complex Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/529—Processes or devices for preparing lime water
-
- 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/004—Sludge detoxification
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/303—Complexing agents
-
- 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
- C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
- C02F2103/24—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof from tanneries
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Description
Przedmiotem wynalazku jest sposób oczyszczania scieków przemyslowych zawierajacych kompleksowe sole metali ciezkich polegajacy na usuwaniu tych zanieczyszczen ze scieków przemyslowych, zwlaszcza ze szlamów pochodzacych z przsmyslu skórzanego.Garbowanie i wyprawianie skór zwierzecych prowadzi do powstawania szlamu zawiera¬ jacego okolo 80 do 95% wody. W zwiazku z duza zawartoscia materialu organicznego szlam ten móglby byc z korzyscia stosowany jako nawóz, gdyby nie byl zanieczyszczony wysoce toksycznymi jonami metali ciezkich, zwlaszcza jonami chromu, zawartymi w chemikaliach stosowanych w produkcji skóry.Spalanie szlamu jest nieekonomiczne, z powodu wysokiej zawartosci wody. Znane sa liczne sposoby kondensacji koloidalnych materialów organicznych za pomoca odpowiednich czynników flokulujacych, w celu polepszenia ich podatnosci na filtrowanie, 'ednakze spo¬ soby te nie rozwiazuja problemu ekonomicznej eliminacji wody.Szlamy o wysokiej zawartosci wody zwykle odprowadza sie do stawów osadowych, jed¬ nakze z powodu coraz ostrzejszych wymagan ochrony srodowiska coraz trudniejszy jest wy¬ bór odpowiedniego miejsca skladowania* W literaturze dotyczacej obecnego stanu techniki w tej dziedzinie br*x danych do¬ tyczacych eliminacji toksycznych materialów i wykorzystywania cennych skladaków szla¬ mów odpadowych.Wynalazek dotyczy sposobu eliminacji ze szlamów odpadowych soli metali ciezkich, zwlaszcza chromu, z uzyskiwaniem pozostalosci zawierajacej materialy organiczne odpowia¬ dajace wymaganiom ochrony srodowiska, które moga byc stosowane w rolnictwie, wynalazek opiera sie na spostrzezeniu, ze zwiazki metali ciezkich obecne jako rózne organiczne lub nieorganiczne kompleksy lub jako nierozpuszczalny w wodzie osad mozna rozkladac za po¬ moca nieorganicznych kwasów i eliminowac z zawiesiny w postaci rozpuszczala w wodzie.2 139 58* Wedlug wynalazku, homogenizowany szlam zawierajacy nie wiecej niz 100 kg/m5, korzys¬ tnie20-40 kg/m5 materialu stalego kontaktuje sie z kwasem siarkowym i mieszanina nieorga¬ nicznych kwasów, takich jak solny, azotowy lub fosforowy zawierajaca co najmniej 3096 wa¬ gowych kwasu siarkowego, w 20 do 100°C, przy energicznym mieszaniu, w taki sposób, by ste¬ zenie kwasu w trakcie dodawania nie przekroczylo 10% wagowych w stosunku do sumarycznej wagi szlamu, a po zakonczmnlu reakcji chemicznych pH mieszaniny reakcyjnej bylo ponizej 1* Ody stezenie materialu stalego w szlamie przekracza powyzsza wartosc, w trakcie obróbki kwasem moze tworzyc sie trwala piana, co znacznie mmniejsza szybkosc reakcji* Gdy kwas lub mieszanina kwasów stosowana do rozkladu kompleksów nie zawieraja kwasu siarkowego, to nastepna separacja, sedymentacja i saczenie zawiesiny sa znacznie trud¬ niejsze niz w obecnosci kwasu siarkowego* Szybkosc rozkladu kompleksów jest zadowalajaca juz w temperaturze pokojowej, dla¬ tego reakcje mozna z powodzeniem prowadzic w oryginalnej, normalnej temperaturze zawie¬ siny, jednakze przez podwyzszenie temperatury reakcja ulega przyspieszeniu* Po zakonczeniu reakcji zaleznej od temperatury zawartosc materialu stalego zawie¬ siny zateza sie, np* przez wyplukanie jonów metali ciezkich woda lub rozcienczonym kwa¬ sem siarkowym, zobojetnienie pozostalosci wapnem gaszonym w zakresie pH 8-10 i wydzie¬ lenie jej z roztworu* Sole metali ciezkich zawarte w roztworze oddzielonym od szlamu za¬ teza sie przez wytracenie i magazynuje jako takie w przeznaczonym do tego miejscu lub, alternatywnie, utylizuje, po oczyszczeniu i separacji* Proces jest przedstawiony na dia¬ gramie blokowym (fig* 1)* Przyklad* Usuwa sie jony chromu z przefermentowanego szlamu odpadowego z przetwórstwa skóry, majacego nastepujacy sklad: zawartosc substancji suchej 200 kg/m5 zawartosc substancji organicznych 100 kg/m5 zawartosc jonów chromu 12 kg/m.Szlam zawiera slady jonów cynku i kadmu i znaczne ilosci jonów zelaza i wapnia* W homogenizatorze 1 szlam miesza sie z woda, w stosunku objetosciowym 1:6, lub z woda zakwaszona zawierajaca jony chromu, wychodzaca z ukladu plukanie-separacja* Za¬ sadniczo jednorodna zawiesina jest wprowadzana do reaktora 2, w którym dodaje sie 96# kwas siarkowy, w ilosci 150 kg na 1 nr szlamu i calosc energicznie miesza, w temperatu¬ rze szlamu, w ciagu 60 minut* Staly material zawiesiny zateza sie w separatorze 3, za- tezony material wprowadza do ukladu plukanie-separacja 4, a nastepnie do ukladu zobo- jetnianie-separacja 5« Jako produkt koncowy otrzymuje sie zawiesine wolna od jonów me¬ tali ciezkich, która zobojetnia sie wapnem gaszonym* Ciecz pluczna z ukladu plucznego k zawraca sie do homogenizatora 1* Zawierajacy chrom roztwór z separatora 3 jest wprowa¬ dzany do reaktora stracajacego 6, w którym za pomoca wapna gaszonego sa wytracane sole metali, w zakresie pH 8 do 10. Stracony osad zawierajacy jony metali ciezkich jest oddzie¬ lany od zasadowej wody w separatorze 7* Sposób jest korzystny, poniewaz - daje zadowalajace rozwiazanie problemów ochrony srodowiska w odniesieniu do szlamów odpadowych z przemyslu skórzanego, czyni zbytecznym zakladanie stawów osadowych i transportowanie toksycznego szlamu; - umozliwia stosowanie szlamu o wyzszej zawartosci materialu organicznego do celów rolniczych, np* do ulepszania gleby; - daje znakomite mozliwosci odzyskiwania wartosciowych skladników otrzymanego osadu, majacego wysoka zawartosc metali ciezkich*139 584 3 Zastrzezenia patentowe 1. Sposób oczyszczania scieków przemyslowych zawierajacych kompleksowe sole Beteli ciezkich, zwlaszcza szlamów odpadowych z przemyslu skórzanego, znamienny tym, ze szlam homogenizuje sie z woda, otrzymujac zawiesine zawierajaca nie wiecej niz 100, korzystnie 20 do 40 kg materialu stalego w 1 m , dodaje kwasu siarkowego i/lub mieszani¬ ny nieorganicznych kwasów zawierajacej co najmniej 30% wagowych kwasu siarkowego, w taki sposób, by stezenie kwasu nie przekroczylo 10tf wagowych w stosunku do sumarycznej nagi zawiesiny, a pH mieszaniny utrzymywalo sie ponizej 1 po zakonczeniu obróbki kwasem, mie¬ szanine energicznie miesza w 20 do 100°C, w czasie zaleznym od temperatury reakcji, od¬ dziela od zawiesiny kwasna ciecz zawierajaca sole metali ciezkich, roztwór zobojetnia sie korzystnie wapnem gaszonym, wytracajac sole metali w zakresie pH 8 do 10, oczyszcza przez przemycie i odmywa organiczna zawiesina jonów z metali i kwasu* 2* Sposób wedlug zastrz* 1, znamienny tym, ze ciecze pluczne zawraca sie do sporzadzania zawiesin* SZLAM WODA __ | I i 1. 1 HOMOGENIZATOF ] f 2 I REAKTOR 1 ' 3 SEPARATOR < f I Z I UKLAD PLUKAC NIE-SEPARA- | CJA I 1 l r™"5 i UKLAD ZOBO¬ JETNIANIE- I ISEPAR ACJA | ¦ KWAS SIARKOWY WODA LUB ROZCIENCZONY ["kwas siarko¬ wy | WAPNO GASZO 1 l j CZYNNIK STRACAJACY 1 6 REAKTOR DO WYTRACANIA | j r 7 SEPARATOR NE V OSAD SOLI METALI CIEZKICH WODA SZLAM POZBA¬ WIONY SOLI ME¬ TALI CIEZKICH FiG. 1 PL PL PL The subject of the invention is a method for purifying industrial sewage containing complex salts of heavy metals, which involves removing these contaminants from industrial sewage, especially from sludge from the leather industry. Tanning and dressing of animal skins leads to the formation of sludge containing approximately 80 to 95% water. Due to its high organic material content, the sludge could be advantageously used as a fertilizer if it were not contaminated with highly toxic heavy metal ions, especially chromium ions, contained in chemicals used in leather production. Incineration of the sludge is uneconomical due to its high water content. Numerous methods are known for condensing colloidal organic materials with appropriate flocculating agents in order to improve their filterability, but these methods do not solve the problem of economic water elimination. Sludges with high water content are usually discharged to settling ponds, however Due to increasingly stringent environmental protection requirements, it is becoming more and more difficult to choose an appropriate storage site. The literature on the current state of the art in this field lacks data on the elimination of toxic materials and the use of valuable waste sludge deposits. The invention concerns a method of eliminating waste sludge of heavy metal salts, especially chromium, to obtain a residue containing organic materials meeting the requirements of environmental protection that can be used in agriculture, the invention is based on the observation that heavy metal compounds present as various organic or inorganic complexes or as insoluble in water, the sludge can be decomposed with inorganic acids and eliminated from the suspension in the form of water dissolved.2 139 58* According to the invention, homogenized sludge containing not more than 100 kg/m5, preferably 20-40 kg/m5 of solid material is contacted with sulfuric acid and a mixture of inorganic acids such as hydrochloric, nitric or phosphoric acid containing at least 3096 by weight of sulfuric acid, at 20 to 100° C., with vigorous stirring, so that the concentration of the acid during the addition did not exceed 10% by weight in relation to the total weight of the sludge, and after the end of the chemical reactions, the pH of the reaction mixture was below 1* Oda, the concentration of solid material in the sludge exceeds the above value, during acid treatment, a permanent foam may be formed, which significantly reduces the reaction rate* When the acid or acid mixture used for the decomposition of the complexes does not contain sulfuric acid, the subsequent separation, sedimentation and filtration of the suspension are much more difficult than in the presence of sulfuric acid. The rate of decomposition of the complexes is satisfactory already at room temperature, therefore the reaction can be successfully performed. carried out at the original, normal temperature of the suspension, however, by increasing the temperature the reaction is accelerated. After completion of the temperature-dependent reaction, the solid material content of the suspension is concentrated, e.g. by rinsing out heavy metal ions with water or dilute sulfuric acid, neutralizing the residue slaked lime in the pH range of 8-10 and separating it from the solution. Heavy metal salts contained in the solution separated from the sludge are concentrated by precipitation and stored as such in a designated place or, alternatively, disposed of after cleaning and separation. * The process is presented in a block diagram (fig. 1) * Example * Chromium ions are removed from digested waste sludge from leather processing, having the following composition: dry matter content 200 kg/m5 organic matter content 100 kg/m5 chromium ion content 12 kg/m. The sludge contains traces of zinc and cadmium ions and significant amounts of iron and calcium ions* In homogenizer 1, the sludge is mixed with water in a volume ratio of 1:6, or with acidified water containing chromium ions, leaving the rinsing-separation system * The substantially homogeneous slurry is introduced into reactor 2, where 96% sulfuric acid is added at a rate of 150 kg per sludge and vigorously stirred at the sludge temperature for 60 minutes. * The solid slurry material is concentrated in separator 3, the concentrated material is introduced into the rinsing-separation system 4, and then into the neutralization-separation system 5. As the final product, a suspension free from heavy metal ions is obtained, which is neutralized with slaked lime*. the sludge system is returned to the homogenizer 1. The chromium-containing solution from the separator 3 is introduced into the precipitation reactor 6, where metal salts are precipitated using slaked lime in the pH range 8 to 10. The lost sludge containing heavy metal ions is separated ¬ poured from alkaline water in separator 7* The method is advantageous because - it provides a satisfactory solution to environmental protection problems in relation to waste sludge from the leather industry, it makes the establishment of settling ponds and the transport of toxic sludge unnecessary; - enables the use of sludge with a higher content of organic material for agricultural purposes, e.g.* for soil improvement; - provides excellent possibilities of recovering valuable components of the obtained sludge, which has a high content of heavy metals*139 584 3 Patent claims 1. Method of purifying industrial sewage containing complex heavy Betel salts, especially waste sludge from the leather industry, characterized in that the sludge is homogenized with water, obtaining a suspension containing not more than 100, preferably 20 to 40 kg of solid material per m², add sulfuric acid and/or a mixture of inorganic acids containing at least 30% by weight of sulfuric acid, in such a way that the acid concentration does not exceed 10% by weight compared to the total naked suspension, and the pH of the mixture remained below 1 after the acid treatment was completed, the mixture was stirred vigorously at 20 to 100°C, for a time depending on the reaction temperature, and the acidic liquid containing heavy metal salts was separated from the suspension, the solution is preferably neutralized with slaked lime, precipitating metal salts in the pH range of 8 to 10, purified by washing and the organic suspension of metal ions and acid is washed* 2* Method according to claims* 1, characterized in that the washing liquids are recycled to prepare suspensions* SLUDGE WATER __ | I i 1. 1 HOMOGENIZATOF ] f 2 I REACTOR 1 ' 3 SEPARATOR < f I Z I NON-SEPARATOR FLUSHING SYSTEM - | TION I 1 l r™"5 i SYSTEM OF OBLIGATION - AND SEPARATION | ¦ SULFURIC ACID WATER OR DILUTED ["sulfuric acid | SLATCH LIME 1 l j PRECIPATION AGENT 1 6 PRECIPATION REACTOR | j r 7 SEPARATOR NE V HEAVY METAL SALT DEPOSIT WATER SLUDGE FREE OF HEAVY METAL SALT Fig. 1 PL PL PL
Claims (2)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HU82100A HU185194B (en) | 1982-01-14 | 1982-01-14 | Method for detoxication mixing tannery sewage sludges |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PL240123A1 PL240123A1 (en) | 1984-06-18 |
| PL139584B1 true PL139584B1 (en) | 1987-02-28 |
Family
ID=10947909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PL1983240123A PL139584B1 (en) | 1982-01-14 | 1983-01-12 | Method of treating industrial waste waters containing complex salts of heavy metals |
Country Status (10)
| Country | Link |
|---|---|
| CS (1) | CS246057B2 (en) |
| DD (1) | DD209430A5 (en) |
| DE (1) | DE3301120A1 (en) |
| ES (1) | ES8402549A1 (en) |
| GB (1) | GB2113199B (en) |
| HU (1) | HU185194B (en) |
| IT (1) | IT1160174B (en) |
| PL (1) | PL139584B1 (en) |
| RO (1) | RO86780B (en) |
| YU (1) | YU6383A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3428535A1 (en) * | 1984-08-02 | 1986-02-13 | Siekmann, Helmut E., Prof.Dr.-Ing., 1000 Berlin | METHOD AND DEVICE, IN PARTICULAR FOR THE CONDITIONING OF SEWAGE SLUDGE |
| DE3503199A1 (en) * | 1985-01-31 | 1986-08-07 | Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck | Process for converting sewage sludges into soil improvers and/or fertilisers |
| DE3627253C2 (en) * | 1986-08-12 | 1995-06-22 | Linde Ag | Process for the biological treatment of substrates containing organic substances |
| DE3919788C1 (en) * | 1989-06-16 | 1990-07-05 | Siebtechnik Gmbh, 4330 Muelheim, De | |
| FI97288C (en) * | 1993-08-26 | 1996-11-25 | Kemira Oy | Procedure for treatment of wastewater sludge |
| ITRM20010671A1 (en) * | 2001-11-12 | 2003-05-12 | Sicit Chemitech S P A | CHROME-BASED PRODUCT IN COMPOSITION WITH HYDROLYZED PROTEINS AND PROCESS FOR ITS OBTAINING. |
| AU2003900241A0 (en) * | 2003-01-21 | 2003-02-06 | Australian Organic Resources Pty Ltd | The extraction and treatment of heavy metals in sewage sludge |
| ITRM20050425A1 (en) * | 2005-08-05 | 2007-02-06 | Sicit Chemitech S P A | PROCESS FOR THE PRODUCTION OF PRODUCTS BASED ON HYDRAULIC PROTEINS IN COMPOSITION WITH MANGANESE. |
| JP5985925B2 (en) * | 2012-08-20 | 2016-09-06 | 水ｉｎｇ株式会社 | Method and apparatus for treating waste liquid containing heavy metal |
-
1982
- 1982-01-14 HU HU82100A patent/HU185194B/en not_active IP Right Cessation
-
1983
- 1983-01-10 RO RO109659A patent/RO86780B/en unknown
- 1983-01-11 CS CS83182A patent/CS246057B2/en unknown
- 1983-01-11 ES ES518907A patent/ES8402549A1/en not_active Expired
- 1983-01-12 PL PL1983240123A patent/PL139584B1/en unknown
- 1983-01-12 DD DD83247194A patent/DD209430A5/en unknown
- 1983-01-12 YU YU00063/83A patent/YU6383A/en unknown
- 1983-01-13 IT IT19091/83A patent/IT1160174B/en active
- 1983-01-14 DE DE19833301120 patent/DE3301120A1/en not_active Withdrawn
- 1983-01-14 GB GB08300987A patent/GB2113199B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CS246057B2 (en) | 1986-10-16 |
| IT8319091A0 (en) | 1983-01-13 |
| DD209430A5 (en) | 1984-05-09 |
| RO86780B (en) | 1985-05-31 |
| GB2113199A (en) | 1983-08-03 |
| ES518907A0 (en) | 1984-03-01 |
| HU185194B (en) | 1984-12-28 |
| YU6383A (en) | 1985-10-31 |
| GB2113199B (en) | 1985-07-10 |
| GB8300987D0 (en) | 1983-02-16 |
| PL240123A1 (en) | 1984-06-18 |
| IT1160174B (en) | 1987-03-04 |
| RO86780A (en) | 1985-05-20 |
| DE3301120A1 (en) | 1983-07-28 |
| ES8402549A1 (en) | 1984-03-01 |
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