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Technology Development on Heavy Metal-Contained Sludge Reduction and Resource Recovery on Stainless Steel Cold-Rolled Mixed Sludge

Based on characteristics of stainless steel cold-rolled products pickling wastewater, a new process route with advantages of sludge originally reduction, wastewater two-stage treatment, Heavy metal-contained sludge and calcium-salt sludge separately recovery is developed. As 2 waste-water treatment... Full description

Journal Title: Applied mechanics and materials 2015-06, Vol.768, p.340-349
Main Author: Shi, Lei
Format: Electronic Article Electronic Article
Language: English
ID: ISSN: 1662-7482
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title: Technology Development on Heavy Metal-Contained Sludge Reduction and Resource Recovery on Stainless Steel Cold-Rolled Mixed Sludge
format: Article
creator:
  • Shi, Lei
ispartof: Applied mechanics and materials, 2015-06, Vol.768, p.340-349
description: Based on characteristics of stainless steel cold-rolled products pickling wastewater, a new process route with advantages of sludge originally reduction, wastewater two-stage treatment, Heavy metal-contained sludge and calcium-salt sludge separately recovery is developed. As 2 waste-water treatment stations operation results have shown, during the passed 6 years, annual sludge reduction ratios (per tons product) reach 43.64% and 50.29% respectively, realizing 105.6 thousands tons of sludge reduction effect and 68.04 millions CNY economic benefits. After two-stage process treatment, effluent water can reach emission standards steadily, Fe,Cr and Ni total contents in the front-part heavy-metal sludge increase from 10% to 30~40% compared with that of one-stage wastewater traditional treatment process, with dramatically decrease of F and S impurities content, therefore it can be used as ferric-contained sludge; while among the post-part calcium-salt sludge, F and S recovery ratios reach 20~40%, with Fe,Cr and Ni total content falls below 3%, therefore it can be used as fluorgypsum or fluorite. Since this technology fit the trend of hazardous waste original reduction and resource categorized recycle, it has a broad application prospect in stainless steel enterprise.
language: eng
source:
identifier: ISSN: 1662-7482
fulltext: no_fulltext
issn:
  • 1662-7482
  • 1662-7482
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descriptionBased on characteristics of stainless steel cold-rolled products pickling wastewater, a new process route with advantages of sludge originally reduction, wastewater two-stage treatment, Heavy metal-contained sludge and calcium-salt sludge separately recovery is developed. As 2 waste-water treatment stations operation results have shown, during the passed 6 years, annual sludge reduction ratios (per tons product) reach 43.64% and 50.29% respectively, realizing 105.6 thousands tons of sludge reduction effect and 68.04 millions CNY economic benefits. After two-stage process treatment, effluent water can reach emission standards steadily, Fe,Cr and Ni total contents in the front-part heavy-metal sludge increase from 10% to 30~40% compared with that of one-stage wastewater traditional treatment process, with dramatically decrease of F and S impurities content, therefore it can be used as ferric-contained sludge; while among the post-part calcium-salt sludge, F and S recovery ratios reach 20~40%, with Fe,Cr and Ni total content falls below 3%, therefore it can be used as fluorgypsum or fluorite. Since this technology fit the trend of hazardous waste original reduction and resource categorized recycle, it has a broad application prospect in stainless steel enterprise.
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abstractBased on characteristics of stainless steel cold-rolled products pickling wastewater, a new process route with advantages of sludge originally reduction, wastewater two-stage treatment, Heavy metal-contained sludge and calcium-salt sludge separately recovery is developed. As 2 waste-water treatment stations operation results have shown, during the passed 6 years, annual sludge reduction ratios (per tons product) reach 43.64% and 50.29% respectively, realizing 105.6 thousands tons of sludge reduction effect and 68.04 millions CNY economic benefits. After two-stage process treatment, effluent water can reach emission standards steadily, Fe,Cr and Ni total contents in the front-part heavy-metal sludge increase from 10% to 30~40% compared with that of one-stage wastewater traditional treatment process, with dramatically decrease of F and S impurities content, therefore it can be used as ferric-contained sludge; while among the post-part calcium-salt sludge, F and S recovery ratios reach 20~40%, with Fe,Cr and Ni total content falls below 3%, therefore it can be used as fluorgypsum or fluorite. Since this technology fit the trend of hazardous waste original reduction and resource categorized recycle, it has a broad application prospect in stainless steel enterprise.
doi10.4028/www.scientific.net/AMM.768.340