Unit on Environment

Dear teachers,

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Please send me a mail. Hilde

Hungarian workshops

 

Here are the questions that were asked from the students to think about and answer on the basis of given material in the room of "environmental

protection and health".

 

Please identify what would be from this garbage heap

reusable:

recyclable:

hazardous waste:

compostable:

 

Why?

 

Please, find eco-labels in the room, describe what they mark/mean!

 

Describe why this desk belongs to a conscious student? What else would you add?

 

Identify the environmental friendly solutions on this house model?

 


   

At the waterworks these interesting pieces of information were given to the participants.

 

 

 

1

Lift station for the incoming wastewater, which is called influent.

 

Gravity carries the sewage from home to the wastewater treatment plant. So it arrives too deep. Wastewater must be liftet to the ground of the wastewater treatment plant in the lift station.

 

2

Control centre with a map

regional plant, 10 000 m3 wastewater/day, 350 km pipes from 14 villages and Vác, a long way from the wastewater treatment plant so we need 30 wet wells

A wet well is a chamber which is used for collecting liquid (for example wastewater), and to which the suction pipe of a pump is attached.

 

3

Inlet screen, or bar screen

 

To remove things that should not be there. Rags, sticks, plastic bags, personal higiene products, etc. (Even paper towels won’t brake down.)

Trash should have been put in the dustbin. L

 

4

Grit chamber

 

Sand and griese removal.

 

5

Fine screen

 

The second rake mechanism for smaller objects.

 

6

Primary clarifier

 

In the primary clarifier, the solid particles in the mixture are attracted together and settle to the bottom, separating from the wastewater. This water will still have lots of nutrients in it.

 

7

Anoxic tank

 

Nutrient removal with denitrification. No oxigene is needed.

Inlet: recicled sludge from the airation tank and raw wastewater from the primary clarifier.

 

8

Airation tank

 

Bacteria are grown, the process of mother nature is accelerated. They form the activated sludge. Dissolved organic matter is removed here. Bacteria form flocs that you will see with a microscope.

 

9

Secondary clarifiers

Bacterial flocs go to the sediment. The sediment is either taken away or recicled to the anoxic tanks.

 

 

10

Machine room for pumps and air pumps.

 

Oxigen concentration meters of airation tanks are on the wall. Regulation of pumps.

 

11

Effluent wastewater

The aim of cleaning wastewater is to minimize any harmful effects before it is returned to the environment.

The water is treated to standard set by the National Inspectorate For Environment, Nature and Water.

 

12

Disinfection

 

Mix with chlorine is possible, but not needed now.

 

13

Sludge thickener.

 

Dewatering.

 

14

Digester

The huge barrel-shaped metal „buildings”. Digested sludge and biogas is produced.

Dewatering.

 

15

Sludge press

 

Dewatering.

 

16

Gasometer

Looks like a huge balloon. The real ballon is inside.

Gas comes from the digester.