Comprehensive Oilgae Report

A detailed report on all aspects of the algae fuel value chain, the Comprehensive Oilgae Report will be of immense help to those who are on the threshold of investing in algae biofuels. More ››

Algae-based Wastewater Treatment

Compiled by a diverse team of experts, with experience in scientific and industrial fields, the Comprehensive Report for Wastewater Treatment Using Algae is the first report that provides in-depth analysis and insights on this important field. It uses innumerable data and information from a wide variety of expert sources and market studies, and distills these inputs and data into intelligence and a roadmap that you can use. More ››

Comprehensive Guide for Algae-based Carbon Capture

A Comprehensive Guide for Entrepreneurs and Businesses Who Wish to get a Basic Understanding of the Business Opportunities and Industry Dynamics of the Algae-based CO2. More ››


Comprehensive Report on Attractive Algae Product Opportunities

This is for entrepreneurs and businesses who wish to get a basic understanding of the algae fuel business and industrThe report provides an overview of the wide range of non-fuel applications of algae – both current and future prospects. It will provide entrepreneurs with an idea of how to derive more benefits from their algal energy ventures. The report provides detailed case studies, success stories and factoids of companies that have been involved in the algae products venture. More ››

Comprehensive Castor Oil Report

There is no other comprehensive report available for castor oil anywhere in the world. This is the first of its kind, and currently, the only one. More ››

Bioplastics Market & Strategy Advisor

Bioplastics Market & Strategy Advisor, published by the Bioplastics Guide, is a unique guiding framework for businesses and entrepreneurs to chart a way forward provides a critical analysis of the status, opportunities & trends of the global bioplastics sector. More ››

Algae - Food and Feed

Edible Sea-weeds 

Hydrocolloids

Animal and Fish Feed

Algae-Useful Substances

Pigments

PUFAs

Vitamins

Anti-oxidants


Algae for Pollution Control

Other Novel Applications

New Technologies in the Mining Industry Wastewater Treatment


Waste water from mining industry shows a wide spectrum of compositions. Many of the components present in waste water from the iron and steel industry are also often present in the water from the mining industry. The waste water from flotation and enrichment of lead and zinc ores, which in addition to components present in waste water from other mining industries also contain xanthate, zinc and lead.

 

Mine wastewater primarily contains heavy metals, cyanide and secondary treated sewage. 

 
  • Iron
  • Sulphate
  • Calcium
  • Al3+
  • pH (2.0-3.0)

This section provides details on the latest developments and efforts in the Mining industry waste water treatment.

Clean Water the Clean Way

One product is the solution for problems over the decades in Wastewater Treatment fish kills, dead zone, aquatic food chain, aquaculture, agriculture...

Nualgi facilitates the growth of diatoms. It prevents the growth of waterweeds, water hyacinth, Green algae and blue-green algae and other waste plants in lakes, ponds, rivers and other water bodies. Other algae like blue Green algae disrupt the ecosystem in water.

Wish to know more?...read more

Contact: Vinayak Bhanu

Mobile 0091 9840441078

Email vinayak@clixoo.com

We have discussed the following:

  • Current Wastewater Treatment Process - Mining Industry
  • New Technologies in the Mining Industry Waste Water Treatment
    • Tailing Ponds
    • Chemical and Biological Methods



Current Wastewater Treatment Process - Mining Industry

Ammoniacal leaching is pretty old and proven technology in the mining industry, having been used for over 80 years, mostly for copper recovery (either metallic copper or copper sulfide with oxidation) but also for nickel and cobalt recovery (after reduction roast, with oxidation). The selectivity it provides over other metals is exactly why it has been used. In fact, as far as hydroxide sludges, there is a big Australian nickel/cobalt project (the Cawse project owned by Centaur Mining) suffering through startup woes right now in which they do an autoclave acid leach to get everything into solution, then partially neutralize it to get rid of iron etc., then precipitate a Ni/Co.

Ammoniacal leaching process is employed to remove metals (specifically Copper, Zinc, Nickel, Cobalt, and Cadmium) from mining industry wastewater.1

Other wastewater treatment systems include,

    • Thickeners
    • Clarifiers
    • Dewatering systems
    • Biological treatment
    • Microfiltration Reverse Osmosis
    • Mine drainage treatment systems
    • Ion exchange (metals and traces contaminant removal)

New Technologies in the Mining Industry Waste Water Treatment

The section below focuses on the recent developments in the mining industry wastewater treatment with tailing ponds and other chemical and biological methods.

Tailings Ponds

Tailings are the materials left over after the process of separating the valuable fraction from the worthless fraction of an ore. The extraction of minerals from ore requires that the ore be ground into fine particles, so tailings are typically small and range from the size of a grain of sand to a few microns. Mine tailings are usually produced from the mill in slurry form.2

Chemical and Biological Treatment of Mining Wastewater

Acid-rock drainage (ARD) also known as acid-mine drainage (AMD) results from the exposure of sulfide minerals, particularly pyritic and pyrrhotitic minerals, to atmospheric oxygen and water. The most common is the chemical precipitation using lime or other basic substances. These systems produce large volumes of wet sludge that often require drying facilities to concentrate the metal hydroxide sludge. Recent developments and improvements have resulted in construction of bioreactors that have a smaller footprint, and treat the metals and acidity more effectively.

Oxyanions such as chromate and arsenate can be removed using the wetland treatment system (passive bioreactor) technology. Arsenic is removed as an arsenic sulfide compound and chromate is reduced to Cr(III) and precipitated as a hydroxide. The passive Bioreactor wetland treatment system offers a less expensive alternative to the conventional chemical precipitation technologies. There still are problems of system hydraulics and useful life to be addressed.

Biological Methods

Many studies have demonstrated that the primary removal mechanisms for the metals are sulphate-reducing bacteria (SRB). These microbes facilitate the conversion of sulphate to sulphide. The sulphides react with metals to precipitate them as metal sulfides, many of which are stable in the anaerobic conditions of the treatment system. The SRB are obligate anaerobes which prefer conditions between pH 5 and 8. Low pH waters do reduce the capacity of the treatment systems to treat metals effectively. Plants have been shown to remove metals by uptake or oxidative precipitation near the roots.3

Sulphate-reducing biofilm and suspension processes were studied for treatment of synthetic wastewater containing sulphate, zinc and iron. The results of this work demonstrate that the lactate supplemented sulphate-reducing processes precipitated the metals as sulphides and neutralized the acidity of the synthetic wastewater (Kaksonen et al.,).

References

1 http://www.finishing.com/98/83.shtml

2http://en.wikipedia.org/wiki/Tailings

3Ronald R.H. Cohen, 2006. Use of microbes for cost reduction of metal removal from metals and mining industry waste streams. Journal of Cleaner Production, 14 (1146-1157).