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Last updated : 4 Oct, 2019

Process for Solidification/Stabilization of Arsenic contaminated sludge generated form water treatment plants

Type:  Process
IPR Status:  Patent

This process is for safe disposal of arsenic-rich sludge generated from arsenic removal plants. In these plants, large quantity of sludge is generated which contains about 5-7 kg. of arsenic per cubic meter of sludge. This sludge is hazardous as per the Resource Conservancy and Recovery Act (RCRA) of USEPA and it contains arsenic much above the permissible standard (0.2 g./m3) for its direct disposal into the inland water environment (CPCB-MEF, GoI, 1995–1996) as it has very high leaching potential.
Arsenic contamination in groundwater and its consequences to the human health have been reported as one of the world’s biggest natural groundwater calamities known to mankind.
This process is designed for stabilization of arsenic contaminated water treatment sludge for its environmental safe disposal and converting it into products having commercial uses like bricks, concrete blocks, pavement tiles etc. It is very practicable, economical and long lasting. The solidified products meet the specified strength requirement for use in civil construction works and leaching of arsenic is far below the permissible limit.

Salient Technical Competing Features: 

The salient features of Arsenic solidification process are:

  • It provides safe disposal of arsenic contaminated sludge particularly obtained from arsenic removal water- treatment plants.
  • Minimizes potential of arsenic to leach back to ground and mix with surface & under-ground water through solidification/stabilization using portland cement.
  • Minimizes the effect of arsenic poisoning in human body i.e arsenicosis, causes due to drinking of arsenic-rich water results in various health effects including skin cancer, diseases of the blood vessels of the legs and feet etc.
  • Provides technically and economically efficient method towards safe landfill of arsenic contaminated water treatment sludge.
  • Provides cost-effective, environmentally safe and easy to handle method of arsenic solidification / stabilization.
  • Provides a long term, permanent treatment of arsenic contaminated sludge management.
  • Manufactures usable construction materials like pavement blocks, concrete blocks etc, and consuming significant quantity of arsenic sludge for field application.
  • Generation of employment through implementation of this new process for production of commercial items in different villages/municipalities.
Techno Economic:  Available on enquiry basis.
Content Details: 

IPR Details :

Patent filed on “Process for Safe Disposal of Arsenic-rich Sludge Generated from Arsenic removal Plant” – CSIR Patent No.0265NF2015, Application No. 201611014779; dated 28/04/2016

Copyright filed on “Process for Stabilization/Solidification of Arsenic contaminated Water Treatment Residuals” – IPMG/Copyright/2015/03

Level/Scale of Development:  Level 6 – Prototype system verified