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Thursday, August 05, 2010

HOSPITAL LIQUID WASTE MANAGEMENT -- ETP & STP




STP FLOW CHART
HOSPITAL EFFLUENT TREATMENT PLANT:

Discharge Calculation:
REF. WASTE WATER ENGINEERING BY METCALF & EDDY PP 28 TABLES 2-11
.
Sourcess of waste water
1. Bed in Hospital= Nos @ 500 liter per bed = Liter
2. Employee in Hospital = nos @ 40 liter per employee= Liter
3. Hostels- Persons = nos @ 150 liters per person. = Liter
4. Kitchen Meals= nos@ 10 liter per meal = Liter
So, Total Quantity of discharge: --------- liter per day
Health Stream Literature Summary - Issue 46 - June 2007
The treatment of hospital waste water: an appraisal
Pauwels, B. and Verstraete, W. (2006) Journal of Water & Health, (4) 405-416.

The following are the “separate” liquid waste water sources coming out of a hospital
  • PATHOLOGICAL LABS
  • ONCOLOGY WASTE
  • LAUNDRY
  • ALL OTHER WASTE
We don't have "separate" laboratory data on PATHOLOGICAL LABS, ONCOLOGY WASTE. And Laundry waste water coming out of hospital complexes.
The composite data , which we have from hospitals after testing their composite effluent , on the basis of which we design a common waste water treatment facility for hospitals are as follows :-

      Inlet Values     Outlet Values

pH   8                 6-9

TSS 250 ppm     100

BOD 300 ppm   30

COD 450 ppm 250

Detergents 30 ppm 10

NH4 20 ppm         2.5

Turbidity 90 NTU < 5

T (C) 24             24

Coli form 4 x 103(Number/100ml)   400

E Coli> 1600(Number/100ml)     < 30


Method of treatment for hospital waste water:

Stage One: Chemical pre treatment at source for PATHOLOGICAL LABS and ONCOLOGY WASTE

TREATMENT OF PATHOLOGICAL LABS & ONCOLOGY WASTE
The outstanding feature of our system is that, rather than tapping the hospital's entire wastewater stream; we concentrate on partial streams such as the toilet sewage from the oncology department. This tends to be particularly highly contaminated due to the medication administered to patients in the course of chemotherapy.

The water passes through an ETP for chemical treatment where hydrogen peroxide is used that destroy the active drug ingredients.

After this pre treatment, this treated water from ETP is sent to stage two having a MBBR STP..

All Other wastewater such as that of the hospital toilet, hostel or the kitchen enters the MBBR STP directly without any pre treatment.

Stage Two: Collection (Anaerobic Treatment, 8-12 hour detention, Dilution method)
Stage Three: MBBR chamber and Settling chamber (Activated Sludge Process)
Stage Four: Chlorination with bleaching powder
Stage Five: Filtration by PSF & ACF and reuse or release to drain.