Use of lignochemicals and humic acids to remove heavy metals from process waste streams
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Help
Clear All

Query Builder

Query box

Help
Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Use of lignochemicals and humic acids to remove heavy metals from process waste streams

Filetype[PDF-517.67 KB]


  • English
    • Details You May Also Like

    Details:

    • Personal Author:
    • Corporate Authors:
      United States. Bureau of Mines
    • Description:
      "The Bureau of Mines investigated the feasibility of removing heavy metals from mineral-process waste streams by precipitation with lignochemicals and humic acids. Lignochemicals are byproducts from the paper industry, while humic acids are obtained by caustic treatment of peat, subbituminous coal, and lignite. These high- molecular-weight organic materials have many functional groups, which can coordinate and form innercomplex salts with heavy metals that are crystalline precipitates. Filtering of a humic-acid- or lignochemical-treated solution or waste stream containing these precipitates removes the heavy metal sequestrates. Tests were conducted with two lignochemical samples, three humic acid samples, lime (cao), and sodium hydroxide (naoh) in which increasing amounts of these additives were reacted with 50 ml of solution containing fe3+, al3+, cr3+, pb2+, cu2+, cd2+, zn2+, co2+, ni2+, mn2+, and hg1+. At the appropriate ph, greater than 90- and 99-pct removal was achieved for these 11 heavy metal ions from the 10- and 100-ppm solutions, respectively, using lignochemicals and humic acids. Removal efficiency with these organic materials is better than that with cao, especially for the more toxic ions, hg1+, cd2+, and pb2+. Unlike the precipitates formed with naoh or cao, those with lignochemicals and humic acids are compact and noncolloidal. The volume of their sludge is sharply lower than that of the finely dispersed lime or soda precipitates; thus, their removal in settling tanks or by simple filtration is enhanced." - NIOSHTIC-2

      NIOSHTIC no. 10006205

    • Subjects:
    • Series:
      Report of investigations (United States. Bureau of Mines) ; 9200
    • Document Type:
      Report
    • Place as Subject:
      United States
    • Collection(s):
    • Main Document Checksum:
    • Download URL:
    • File Type:

    Supporting Files

    • No Additional Files

    More +

    You May Also Like

    Checkout today's featured content at stacks.cdc.gov