Equations needed for Mechanical and physical processes

Question 1

Calculate volume of EQ tank

Answer 1

Qin = Qout

Question 2

Node Eq for concentration

Answer 2

(Ca x Qa + Co x Qo) / (Qa+Qo)

Question 3

Sedimentation tank surface area and Height

Answer 3

A= Q/qA H=V/A

Question 4

Hydraulic retention time

Answer 4

HRT= V/Q, where V=(HRT (secs) x Q(m3/h))/ 3600(secs/hour)

Question 5

Settling velocity

Answer 5

Vs = qA

Question 6

Hydrocyclone volume of sand

Answer 6

Cvo = Vsand,0 / V total sand = Cmo / p (density)

Question 7

Balance of flow rate

Answer 7

Qo = Q under + Q over

Question 8

Flow ratio

Answer 8

Flow ratio = Q over / Q under

Question 9

For DAF: Air solid ratio Lts

Answer 9

Lts = Qr x Crair x Mair x efficiency / Q in x Ts sludge in

Question 10

For DAF: Henrys law

Answer 10

C air = K h air x P (pressure)

Question 11

For DAF: Recycle ratio

Answer 11

RRf = Qr / Qin

Question 12

DAF: Solid loading rate

Answer 12

BA = (Q X Ts) / A

Question 13

RO : membrane flux

Answer 13

Vp = Qp / A (Membrane surface Area) = Kp ( area pressure difference - osmotic pressure difference)

Question 14

RO : feed flow rate

Answer 14

Qf = Qp /r (Recovery rate)

Question 15

Fixed bed adsorber : Loading of adsorbent

Answer 15

q(t) = x/Ma = V/Ma x (Co -C(t))

Question 16

Fixed bed adsorber : Activated carbon consumption

Answer 16

Fac = (Co x Ceq) . Q / q

Question 17

Fixed bed adsorber Granulated AC Mass (M gac

Answer 17

M gac = Filter run time x Fac

Question 18

Fixed bed adsorber GAC Volume and GAC height

Answer 18

V gac = M ac / p (density) H gac = V/A