K CONSULTATION | design and engineering consultancy firm based in India for Water Treatment Plants and Solid-Liquid Separation

Kcon PMC Pvt. Ltd. is a 25 years old design and engineering consultancy firm based in India. We specialize in water treatment systems and solid-liquid separation. We work in private, industrial, municipal and government sectors. Our founders have a cumulative experience of seventy years in this field.

We have to our credit about 600 plants around the world

Ladivali, Dist. Raigadh, Maharashtra ( Figure )

This is a small Water treatment Plant for a dye manufacturing company. Raw water source is river patalganga. The raw water is contaminated with industrial effluents. The average turbidity during monsoon is 100-200 NTU, which peaks to 500 NTU during flash flooding. The plant had original capacity of 30 m3 / hr. The treatment units consisted of a Receiving chamber, Parshall Flume, Flash Mixer and Sludge blanket type hopper-bottom settling tank.

The plant was augmented to capacity 100 m3 / hr in the year 1992. The existing inlet works were retained. A mechanical flocculation tank with detention time of 35 minutes was provided between flash mixer and settling tank. The settling tank was converted to a tube settling tank with surface loading rate of 3500 lph/sqm. Entire plan area of the tank was covered with tube modules, which were supported over mild steel sections. New collection troughs with V notches were Provided in mild steel. The incoming flocculated water was distributed at the depth of 1.5m below the tube modules with perforated distribution pipes. This was done to change the predominantly vertical flow pattern and to avoid possible disturbance to sludge blanket by increase in the flow. Alum is used as a coagulant. Lime is dosed during high turbidity period. Pre-chlorination is done in Receiving Chamber. Clarified water turbidity achieved is between 5 to 10 NTU. As this was a single stream ‘on-line’ plant, shut down period for retrofitting of settling tank was limited to 72 hours only.

During further expansion program undertaken by the company, gravity filters were added to achieve treated water quality less than 1-2 NTU. Three new rapid sand gravity filter beds with rate of filtration 500 lph/Sqm were provided with an overhead backwash water tank. Due to owner’s insistence on gravity filters, the clarified water was to be pumped to filters as the FSL of existing clarified water storage tank was barely 1.00 m above the ground. A new filtered water (pure water) sump of adequate capacity was constructed with a pump house to supply treated water to the factory.

There was enough redundancy provided in the process design and hydraulics to further augment the plant capacity to 150 m3 / hr if and when required. When operated at this rate, the detention time of flocculator will reduce to 17.5 min, the loading on the Tube Settler will increase to 5250 lph/sqm and rate of filtration will be 7500 lph/sqm. The drive-unit for flocculator is capable of imparting the additional energy to supplement higher velocity gradient. The Tube Settlers are capable of handling the increase in surface loading effectively. The rapid sand gravity filter beds will be converted into dual media filters by replacing top portion of sand media with Coconut shell / Anthracite coal.

5/87 Shubhankaroti, Vidya Vihar colony, Nasik Road, Nashik 422101, Maharashtra, INDIA
Tel : +91-253-6450126, 2456655 Email : kcon@vsnl.com, info@kconpmc.com
website : www.KconPMC.com