IT202100023831A1 - Chrome recovery process from tanning sludge and a plant. - Google Patents
Chrome recovery process from tanning sludge and a plant. Download PDFInfo
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- IT202100023831A1 IT202100023831A1 IT102021000023831A IT202100023831A IT202100023831A1 IT 202100023831 A1 IT202100023831 A1 IT 202100023831A1 IT 102021000023831 A IT102021000023831 A IT 102021000023831A IT 202100023831 A IT202100023831 A IT 202100023831A IT 202100023831 A1 IT202100023831 A1 IT 202100023831A1
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- Prior art keywords
- sludge
- station
- chromium
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- sent
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims description 34
- 239000010802 sludge Substances 0.000 title claims description 33
- 238000011084 recovery Methods 0.000 title claims description 4
- 239000011651 chromium Substances 0.000 claims description 30
- 229910052804 chromium Inorganic materials 0.000 claims description 30
- 239000012071 phase Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 7
- 238000010335 hydrothermal treatment Methods 0.000 claims description 6
- 239000007791 liquid phase Substances 0.000 claims description 6
- 238000002386 leaching Methods 0.000 claims description 5
- 230000008719 thickening Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 208000005156 Dehydration Diseases 0.000 claims description 2
- 230000031018 biological processes and functions Effects 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 claims description 2
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 2
- 239000011790 ferrous sulphate Substances 0.000 claims description 2
- 231100000719 pollutant Toxicity 0.000 claims description 2
- 238000005119 centrifugation Methods 0.000 claims 4
- 239000002351 wastewater Substances 0.000 description 6
- 101001136034 Homo sapiens Phosphoribosylformylglycinamidine synthase Proteins 0.000 description 3
- 150000005857 PFAS Chemical class 0.000 description 3
- 102100036473 Phosphoribosylformylglycinamidine synthase Human genes 0.000 description 3
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000003440 toxic substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 235000019645 odor Nutrition 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 231100000167 toxic agent Toxicity 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
- C02F1/26—Treatment of water, waste water, or sewage by extraction
-
- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- 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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
- C02F11/08—Wet air oxidation
- C02F11/086—Wet air oxidation in the supercritical state
-
- 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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- 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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- 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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
-
- 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
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
-
- 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
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
Description
DESCRIZIONE DESCRIPTION
dell'invenzione avente per titolo: of the invention entitled:
"Procedimento di recupero del Cromo dai fanghi conciari ed un impianto? "Procedure for recovering chromium from tanning sludge and a plant?
La presente invenzione concerne un procedimento di recupero del Cromo dai fanghi conciari ed un impianto per attuare il procedimento-? noto che i reflui provenienti dai diversi processi di concia delle pelli hanno caratteristiche altamente inquinanti per il loro contenuto di sostanze organiche disciolte (BOD e COD), PFAS, presenza di composti dell?Azoto, Solfuri, particelle sospese e sedimentabili, Cloruri, Solfati, Cromo, etc. The present invention relates to a process for recovering chromium from tanning sludge and to a plant for carrying out the process? it is known that the wastewater from the various leather tanning processes have highly polluting characteristics due to their content of dissolved organic substances (BOD and COD), PFAS, the presence of nitrogen compounds, sulphides, suspended and sedimentable particles, chlorides, sulphates, Chrome, etc.
Generalmente detti reflui vengono convogliati ad impianti di depurazione articolati in pi? sezioni chimico-fisiche e biologiche. Nella maggior parte dei casi le aziende conciarie avviano i lori reflui ad impianti consortili che trattano i reflui di numerose aziende. Generally, these wastewaters are conveyed to purification plants divided into several? chemical-physical and biological sections. In most cases the tanning companies send their wastewater to consortium plants which treat the wastewater of numerous companies.
L?impiego di impianti consortili permette di ottimizzare i costi di trattamento e garantisce migliori controlli. La depurazione dei reflui porta alla produzione di ingenti quantit? di fanghi (alcune decine di migliaia di tonnellate ogni anno). The use of consortium systems makes it possible to optimize treatment costs and guarantees better controls. The purification of wastewater leads to the production of large quantities of sludge (several tens of thousands of tons each year).
Questi fanghi presentano grandi difficolt? per essere smaltiti: infatti la presenza del Cromo ne preclude la possibilit? di incenerimento (termovalorizzazione) in quanto la combustione, ossidando il Cromo da Trivalente ad Esavalente (composto estremamente solubile e tossico), produce emissioni aeriformi, solide e liquide estremamente pericolose. These muds present great difficulties? to be disposed of: in fact, the presence of chromium precludes its possibility? incineration (waste-to-energy) as the combustion, oxidizing the Chromium from Trivalent to Hexavalent (an extremely soluble and toxic compound), produces extremely dangerous gaseous, solid and liquid emissions.
Il fango dunque non pu? che essere smaltito in discariche controllate le quali tuttavia, secondo quanto previsto dalle normative europee, non potrebbero ricevere rifiuti con un contenuto di sostanze organiche superiore al 5%. Per questo vincolo le discariche non potrebbero dunque ricevere i fanghi conciari che ne contengono quantit? decisamente maggiori. Attualmente infatti si continua a operare, in violazione della norma europea in materia di rifiuti, con continue deroghe in quanto non vi sono soluzioni alternative. So mud can't that be disposed of in controlled landfills which, however, according to the provisions of European regulations, could not receive waste with an organic substance content higher than 5%. For this constraint, landfills could therefore not receive the tanning sludge that contains quantities decidedly greater. Currently, in fact, we continue to operate, in violation of the European law on waste, with continuous derogations as there are no alternative solutions.
Attualmente il fango, proveniente dalla depurazione biologica, dopo una fase di ispessimento (statico o per flottazione) che porta il fango al 3-5% di secco, viene prima disidratato con centrifughe e/o filtropresse arrivando ad un tenore di secco intorno al 25-35% di sostanza secca e successivamente essiccato a caldo fino ad un tenore di secco dell?80% circa (cfr. fig. 1) Questa fase di essiccazione a caldo, necessaria per ridurre i volumi di fango da portare in discarica, ha costi energetici elevatissimi Currently the sludge, coming from biological purification, after a thickening phase (static or by flotation) which brings the sludge to 3-5% dry, is first dehydrated with centrifuges and/or filter presses reaching a dry content of around 25%. -35% of dry substance and subsequently heat-dried up to a dry content of approximately 80% (see fig. 1) This heat-drying phase, necessary to reduce the volumes of sludge to be taken to the landfill, has costs very high energies
Scopo dell?invenzione ? quello di recuperare la pressoch? totalit? del Cromo, che possa essere interamente recuperato e valorizzato, come Cromo zerovalente o come Ossido Purpose of the invention? to recover the quasich? totality of Chromium, which can be entirely recovered and valorised, as zero-valent Chromium or as Oxide
Altro scopo dell?invenzione ? quello di ottenere un fango che possa essere utilizzato per recuperarne l?elevato contenuto calorico (PCI: 15.000 kJ/kg) attraverso la sua termovalorizzazione (incenerimento con recupero di calore) con l?ulteriore vantaggio di distruggere in modo definitivo le sostanze organiche resistenti alla biodegradazione e tossiche in esso presenti (es: PFAS). Another purpose of the invention? that of obtaining a sludge that can be used to recover its high caloric content (PCI: 15,000 kJ/kg) through its incineration (incineration with heat recovery) with the further advantage of definitively destroying the organic substances resistant to biodegradable and toxic substances present in it (e.g.: PFAS).
Altro scopo dell?invenzione ? ridurre di circa 6-8 volte il volume ed il peso del residuo da smaltire in discarica finale (le ceneri di fondo derivanti dalla combustione del fango nel termovalorizzatore). Detto residuo finale con un basso contenuto in Cromo e contenuto di sostanze organiche trascurabile (quindi conforme a quanto prescritto dalla norma europea in materia di discariche) sar? caratterizzato da un impatto sull?ambiente irrisorio rispetto al fango attuale in termini di emissioni solide, liquide, aeriformi, odorigene. Another purpose of the invention? reduce by about 6-8 times the volume and weight of the residue to be disposed of in the final landfill (the bottom ash deriving from the combustion of the sludge in the waste-to-energy plant). Said final residue with a low Chromium content and negligible content of organic substances (therefore compliant with the provisions of the European standard on landfills) will be? characterized by a negligible impact on the environment compared to the current sludge in terms of solid, liquid, gaseous and odorous emissions.
Per questo motivo sar? facilmente smaltibile in discariche controllate a costi decisamente ridotti rispetto a quelli attuali. Vista la riduzione in quantit? e in pericolosit? dei residui da smaltire si stima una riduzione dei costi di trasporto e smaltimento dell?ordine delle 20 volte. For this reason it will be easily disposed of in controlled landfills at decidedly lower costs than the current ones. Given the reduction in quantity? and in danger? of the residues to be disposed of, a 20-fold reduction in transport and disposal costs is estimated.
Tale scopo ? raggiunto con un procedimento come descritto nella rivendicazione 1 e con un impianto come descritto nella rivendicazione 4. That purpose? achieved with a process as described in claim 1 and with a plant as described in claim 4.
La presente invenzione viene qui di seguito ulteriormente chiarita in una sua preferita forma di pratica realizzazione riportata a scopo puramente esemplificativo e non limitativo con riferimento alle allegate tavole di disegno in cui The present invention is hereinafter further clarified in a preferred embodiment thereof, shown for purely exemplifying and non-limiting purposes with reference to the enclosed drawings in which
La fig. 1 mostra in vista schematica un impianto utilizzato secondo la tecnica nota, e fig. 1 shows in schematic view a plant used according to the prior art, e
La fig.2 mostra in vista schematica un impianto per attuare l?invenzione. Fig.2 shows a schematic view of a plant for implementing the invention.
Come si vede dalle figure il procedimento secondo l?invenzione prevede che i reflui 101 da conceria vengano trattati in una stazione 2 di trattamento delle acque per trasferire ? con processi fisici, chimici e biologici - i numerosi inquinanti disciolti nei fanghi solidi che vengono separati dall?acqua che viene inviata allo scarico finale. As can be seen from the figures, the process according to the invention provides that the wastewater 101 from the tannery is treated in a water treatment station 2 to transfer ? with physical, chemical and biological processes - the numerous pollutants dissolved in the solid sludge which are separated from the water which is sent to the final discharge.
I fanghi 102 in uscita dalla stazione 2 di vengono inviati ad una stazione di ispessimento 4 in modo da ottenere un fango ispessito 104 con circa il 3-5 % di sostanza secca che viene inviato ad una stazione 6 di lisciviazione del cromo. The sludge 102 leaving station 2 is sent to a thickening station 4 so as to obtain a thickened sludge 104 with about 3-5% of dry matter which is sent to a chromium leaching station 6.
La fase di lisciviazione ? che ha lo scopo di estrarre la maggior parte del Cromo presente nel fango - pu? essere effettuata in pi? modalit? e in pi? fasi successive che sfrutteranno la solubilit? del Cromo Esavalente a pH > 10 (ad es.: per Na2CO3) e la solubilit? del Cromo Trivalente a pH < 2 (ad es. per H2SO4). Per ossidare il Cromo Trivalente ad Esavalente possono essere utilizzate sostanze ossidanti quali Acqua Ossigenata, Ozono, ecc. The leaching phase ? which has the purpose of extracting most of the chromium present in the mud - pu? be carried out in pi? mode? and more subsequent phases that will exploit the solubility? of Hexavalent Chromium at pH > 10 (e.g.: for Na2CO3) and the solubility? of Trivalent Chromium at pH < 2 (e.g. for H2SO4). To oxidize Trivalent Chromium to Hexavalent, oxidizing substances such as hydrogen peroxide, ozone, etc. can be used.
Dalla lisciviazione si ottiene una fase liquida 108 contenente il Cromo e un fango 110 a basso tenore di cromo. Questo fango viene trattato in una stazione di riduzione 14 con una sostanza riducente (es: Solfato Ferroso) per ridurre il Cromo esavalente residuo a Trivalente. Dai qui passa in una stazione 20 (centrifuga/filtropressa/nastropressa o altra tipologia di filtrazione) per un trattamento di disidratazione. I fanghi in uscita dalla stazione 20 possono essere inviati ad una stazione 22 di termovalorizzazione che provveder? a recuperare il calore From the leaching, a liquid phase 108 containing chromium and a sludge 110 with a low chromium content are obtained. This sludge is treated in a reduction station 14 with a reducing substance (e.g. ferrous sulphate) to reduce the residual hexavalent chromium to trivalent. From here it passes into a station 20 (centrifuge/filter press/tape press or other type of filtration) for a dehydration treatment. The sludge leaving station 20 can be sent to a waste-to-energy station 22 which will provide to recover the heat
La fase liquida 108 contenente il Cromo viene sottoposta in una stazione 16 ad un procedimento idrotermale ad alta temperatura (nel range 350 - 480 ?C) e pressione (nel range 200 ? 250 bar) che porta la soluzione in condizioni supercritiche e fa precipitare il Cromo come zerovalente o ossido. The liquid phase 108 containing the Chromium is subjected in a station 16 to a hydrothermal process at high temperature (in the range 350 - 480 ?C) and pressure (in the range 200 ? 250 bar) which brings the solution to supercritical conditions and causes the Chromium as zerovalent or oxide.
In alternativa al trattamento idrotermale la fase liquida contenete il Cromo pu? essere sottoposta a processi di recupero del Cromo diversi (precipitazione, ossido-riduzione, ecc) in relazione al grado di purezza del Cromo che si desidera raggiungere. As an alternative to hydrothermal treatment, the liquid phase containing chromium can be subjected to different chromium recovery processes (precipitation, oxidation-reduction, etc.) in relation to the degree of purity of chromium to be achieved.
Il Cromo 105, mediamente 50 kg per ogni tonnellata di fango conciario disidratato, pu? essere integralmente avviato al recupero anche nello stesso processo di concia delle pelli (economia circolare). Il liquido in uscita dal trattamento idrotermale (stazione 16) viene inviato alla stazione di riduzione 14 (per la riduzione di eventuali tracce di Cromo Esavalente) e di l? ? mescolato al fango a basso tenore di cromo 110 - alla stazione di centrifuga/filtropressa 20. Chrome 105, on average 50 kg for each ton of dehydrated tanning sludge, can be fully recycled even in the tanning process itself (circular economy). The liquid leaving the hydrothermal treatment (station 16) is sent to the reduction station 14 (for the reduction of any traces of Hexavalent Chromium) and from there ? mixed with low chromium sludge 110 - at centrifuge/filter press station 20.
Da quanto detto risulta chiaramente che il procedimento secondo l?invenzione presenta i seguenti vantaggi: From what has been said it is clear that the process according to the invention has the following advantages:
- consente di recuperare la pressoch? totalit? del Cromo presente nel fango con un livello elevato di purezza per il suo riutilizzo; - allows you to recover the quasich? totality of Chromium present in the mud with a high level of purity for its reuse;
- consente di ottenere un fango e di recuperare il calore; - it allows to obtain a sludge and to recover the heat;
- presenta ridotti costi di trasporto e smaltimento finale in discarica del residuo solido privo di sostanze organiche e Cromo con un volume e peso ridotto di 6-8 volte; - it has reduced transport costs and final disposal in landfills of the solid residue free of organic substances and Chromium with a volume and weight reduced by 6-8 times;
- un azzeramento di PFAS, IPA, POP immessi nell?ambiente per lo smaltimento dei residui solidi; - a zeroing of PFAS, IPA, POP released into the environment for the disposal of solid residues;
- presenta una drastica riduzione degli odori emessi in fase di smaltimento dei residui solidi. - presents a drastic reduction of odors emitted during the disposal of solid residues.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT102021000023831A IT202100023831A1 (en) | 2021-09-16 | 2021-09-16 | Chrome recovery process from tanning sludge and a plant. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT102021000023831A IT202100023831A1 (en) | 2021-09-16 | 2021-09-16 | Chrome recovery process from tanning sludge and a plant. |
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| Publication Number | Publication Date |
|---|---|
| IT202100023831A1 true IT202100023831A1 (en) | 2023-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| IT102021000023831A IT202100023831A1 (en) | 2021-09-16 | 2021-09-16 | Chrome recovery process from tanning sludge and a plant. |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4086319A (en) * | 1976-06-09 | 1978-04-25 | Jones Bradford H | Recovery of chromium from tannery waste |
| CN101624247B (en) * | 2009-07-30 | 2012-07-25 | 温州大学 | Technology for supercritical water oxidation processing of leather wastewater |
| CN105523665A (en) * | 2016-01-12 | 2016-04-27 | 武汉森泰环保股份有限公司 | Method for recovering chromium from leather tanning waste water |
| CN104609683B (en) * | 2014-12-12 | 2016-10-05 | 浙江工商大学 | A kind of renovation process of chrome tanning Heavy Metals in Sludge chromium |
| CN107522370A (en) * | 2017-09-11 | 2017-12-29 | 山东农业大学 | A kind of chrome tanning sludge waste liqouor Application way |
| CN109824219A (en) * | 2019-04-01 | 2019-05-31 | 陕西科技大学 | A kind of system for processing chrome-containing wastewater and its method |
| CN110669877A (en) * | 2019-10-26 | 2020-01-10 | 辛集市凌爵皮革有限责任公司 | Processing technology of sheep leather and sheep leather |
-
2021
- 2021-09-16 IT IT102021000023831A patent/IT202100023831A1/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4086319A (en) * | 1976-06-09 | 1978-04-25 | Jones Bradford H | Recovery of chromium from tannery waste |
| CN101624247B (en) * | 2009-07-30 | 2012-07-25 | 温州大学 | Technology for supercritical water oxidation processing of leather wastewater |
| CN104609683B (en) * | 2014-12-12 | 2016-10-05 | 浙江工商大学 | A kind of renovation process of chrome tanning Heavy Metals in Sludge chromium |
| CN105523665A (en) * | 2016-01-12 | 2016-04-27 | 武汉森泰环保股份有限公司 | Method for recovering chromium from leather tanning waste water |
| CN107522370A (en) * | 2017-09-11 | 2017-12-29 | 山东农业大学 | A kind of chrome tanning sludge waste liqouor Application way |
| CN109824219A (en) * | 2019-04-01 | 2019-05-31 | 陕西科技大学 | A kind of system for processing chrome-containing wastewater and its method |
| CN110669877A (en) * | 2019-10-26 | 2020-01-10 | 辛集市凌爵皮革有限责任公司 | Processing technology of sheep leather and sheep leather |
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