Council of Scientific and Industrial Research

Sukumar Devotta

Arumugam Sudalai

Sanjeevani Amrit Pardhy

Vinay Vijayraj Thakur

Sadhana Suresh Rayalu

Tapas Nandy

Girish Ramesh Pophali

Santosh Narain Kaul

Pawan Kumar

Siddharth Ulhas Meshram

Amit Kumar Bansiwal

Nitin Kumar Labhsetwar

Gajanan Kundalik Dewkar

Rishi Narayan Singh

Gajanan Kundali Dewkar

The improved circular secondary clarifier of the present invention requires less surface area and low HRT and provides efficient solids-liquid separation. The improved clarifier has better SS and BOD reduction and provides high under flow solids concentrations, as compared to conventional secondary clarifiers. The improved clarifier is even capable of treating wastewaters containing low MLSS concentration. One of the biggest advantages of improved clarifier is that it does not require a separate sump cum pump house as it removes the settled sludge using suction mechanism thereby reduces capital and recurring cost. Further, it provides natural flocculation, which is essential for agglomeration of solids and increases particle size referred to as 'floc' and eliminates provision for a separate flocculation facility thereby reduces capital and recurring costs.

Circular secondary clarifier for wastewater treatment and an improved solids-liquid separation process thereof

Present invention deals with cost-effective surface-modified zeolite materials developed from commercial zeolites and flyash-based zeolites by treating with surface modifiers like hexadecyltrimethyl ammonium bromide (HDTMA-Br). The formation of zeolitic materials with anionic characteristics requires treatment with a surfactant with initial concentrations greater than its critical micelle concentration (CMC). The sorption of oxyanions on the surfactant-modified zeolite (SMZ) is attributed to surface complexation and surface precipitation. Incorporation of metal ions on SMZ showed improved anion uptake for dearsenification of water due to synergistic effects and is able to meet the stringent target of 10 ppb of As on potable water being adopted by most countries. High selectivity, faster kinetics and high adsorption capacity ensures cost effectiveness of this product as compared to other low-cost products for dearsenification. Zeolite analogues with anionic characteristics have been developed for their applications for removal of arsenic from water. The material developed can also be used to remove other anions like chromium and selenium.

Surface-modified zeolite and process for synthesis thereof for sequestration of anions

The present invention relates to a process for the conversion of phenol to hydroquinone and quinones. More particularly this invention relates to a process for the oxidation of phenol to a mixture of 1,4-benzoquinone and hydroquinone using an oxidant in the presence of titanium superoxide as a reusable catalyst in a liquid phase condition.

Process for conversion of phenol to hydroquinone and quinones

The present invention provides a process for regiospecific chlorination of an aromatic or aliphatic compound with a chlorine source comprising a metal chloride and other than Cl and SO Cl in presence of hypervalent iodine catalyst and in acidic medium.

Catalytic process for regiospecific chlorination of alkanes, alkenes and arenes

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Nagpur, India

Sukumar Devotta