DPR TILL 02-06-15

PROGRESS REPORT FOR RB PROJECT TILL 02/06/15

1. EQUALUZATION TANK:

The project started with septic tank cleaning. It is 60 m3

tank in which industrial waste/ effluent of entire plant

would accumulate. The tank has rectangular base area of

40 ft2 approximately. Submersible pumps were used to

remove water and subsequently, sweepers put out all

the sludge manually and disposed it into drain. All safety

measures were adopted during the entire cleaning

process. Compressed air line was provided so as to avoid

short of breath problem. The man holes were kept open throughout in order to avoid

accumulation of toxic gases inside the tank. Once the cleaning process was completed, floor

was leveled using concrete. It was strengthened using SBR binder. The floor was allowed to

cure and dry.

Then concrete blocks for the aeration header were plastered to the surface. They were installed

in such a way that the aeration header lies along the centre of the tank. As there are three

portions in the tank, core cutting was done to allow passage of header from one compartment

to another. The header (3’’) was then installed, 100 mm from the underground level, supported

by blocks. They were further clamped with u bolts and were then coated with concrete. All

remaining pebbles were removed from the tank after installation.

Diffusers serve the medium for the aeration. They are

coarse bubble diffusers, which provide efficient mixing

followed by growth of micro-organisms, which are actually

responsible to carry out the process, i.e. decreasing COD &

BOD. Diffusers are attached to the aeration header. Silicone

is used to provide water proofing.


Two submersible pumps are also placed, that will

transfer the water to the bio reactor, delivering pressure

of about 1.5 bar. 2’’ line is connected to the pump

outlet, evolving from a cut out provided for this purpose.

These lines connect to a header from which a common

emerges, connecting the septic tank and the reactor.

Double union ball valves are provided followed by NRV

to prevent back flow. Line (1/2’’) for pressure gauge is

also provided. A frame is fabricated for the cut out,

coated with red oxide to prevent corrosion. Checkered

plates have been fabricated. Ropes are provided to

facilitate easy removal of pumps when required. A drain

line is provided to with draw water outside the factory.

This is provided for safety measures, i.e. avoiding entry

of dead organisms into the reactor. Supports are

fabricated as required.


2. SUPPORTS FABRICATION AND INSTALLTION:

Three types of E supports were designed and fabricated

for the piping spool and cable trays. They were coated

with red oxide and painted royal blue color. The spool

and cable trays were then run on the supports.

3. CONSTRUCTION OF PIT:

It started with excavation of pit having approx.

dimensions of 5*5*5 ft. during excavation seepage water

starts accumulating. Therefore, padlo was used to cater this problem. After then pit was given

physical structure using wooden planks. Iron reinforced concrete was used for its construction.

It was then left for some days to cure and dry. The floor was later on plastered.


An enclosure of material SS 316, was fabricated

for the bar screen. Bar screen having dimensions

of about 1600*900 mm, will be placed at an

angle of 45ᴼ. This bar screen is responsible to

retain all the solid material present in the

effluent. Rawl bolts and concrete support the

enclosure. Later on ceiling for the pit is laid using

reinforced concrete.


A cavity is provided for manhole frame and

checkered plate. Finally bitumen diluted in

turpentine oil is coated on the outside wall to

prevent entry of seepage water into the pit.

4. BLOWER INSTALLATION:

Blower is palced on the foundation pad. The line (3’’) originating from the septic tank is

connected with the 1.5’’ line, attached to the blower, through a reducing bush.

Documents

DPR TILL 02-06-15