How is wastewater treated and processed?
- Various methods exist for high-level processing including filtration through sand and charcoal filters & deactivation of microorganisms (disinfection) by using chlorine or UV radiation. KNOW IT!! - Most jurisdictions in the U.S. require that wastewater receive at least secondary treatment.
What is a sludge digester in a wastewater treatment plant?
The sludge digester in a wastewater treatment plant is designed to decompose organic material by aerobic microorganisms Most plastics pose a special problem in the waste stream because they
How much does a wastewater treatment study cost?
Home Subjects Explanations Create Study sets, textbooks, questions Log in Sign up Upgrade to remove ads Only $35.99/year Wastewater Treatment STUDY Flashcards Learn Write Spell Test PLAY Match Gravity Created by kelseylara Terms in this set (17) Primary treatment in a sewage treatment plant is designed to: Remove solids from wastewater
What is the difference between primary and secondary wastewater treatment?
- Most jurisdictions in the U.S. require that wastewater receive at least secondary treatment. - Water that has received only primary treatment is not recommended for any use and generally needs secondary or tertiary treatment for common purposes such as landscape irrigation.
How are liquid wastes handled in a water treatment facility?
The high-level liquid waste is pumped out of storage into a treatment plant where it is calcined and mixed with glass frit. The mixture is melted and drained into a stainless-steel canister where it solidifies into a vitrified waste form.
Which of the following states an important difference between Plasmodial slime molds and cellular slime molds?
Which of the following states an important difference between plasmodial slime molds and cellular slime molds? Plasmodial slime molds are unicellular: cellular slime molds are multicellular.
How do cellular slime molds differ from plasmodial slime molds quizlet?
The plasmodium phase of the acellular slime molds differs from the pseudoplasmodium of the cellular slime molds in that it is diploid. This mass gives rise to a fruiting body in which meiosis occurs and haploid spores are produced. The spores germinate to produce flagellated gametes.
Why is it called Plasmodial slime mold?
On the other hand, plasmodial slime molds start out as individual amoeboid cells, but join together to form a multi-nucleate mass having only one cellular membrane (a "super-cell" containing multiple nuclei). This mass is referred to as a plasmodium and is frequently observed as threads of "slime" on rotting wood.
How long does wastewater stay in a tank?
There are no pumps or mechanical parts. The time the wastewater remains in the tank is called the retention time and should be a minimum of 24 hours.
What is the purpose of a septic tank?
The aim in wastewater treatment is to: reduce the amount of biodegradable material and solids. remove toxic materials.
What is a waste stabilization pond?
Waste stabilisation ponds are natural or constructed ponds used for treating sewage or other wastewaters biologically by harnessing the power of sunlight and wind. They are ideal for tropical countries like Ethiopia. The sewage collected by the sewerage network in Addis Ababa goes to waste stabilisation ponds at Kality.
What is a septic tank?
A septic tank (Figure 6.5) is an underground and watertight tank made of concrete, fibreglass or PVC in which sewage is collected and partially treated . These are used for water-flushed systems that are not connected to a sewer. Concrete septic tanks are commonly used in Ethiopia.
How often should septic tanks be desludged?
You can estimate this by putting a graduated stick into the tank. Depending on usage, this is typically once every 12 months. A vacuum truck is usually used to suck the sludge out for disposal (Figure 6.8).
What is the process of emptying a pit called?
The process of pit emptying is sometimes called desludging . There are manual and mechanical methods for desludging , but the manual removal of faecal sludge from pit latrines poses severe risks to those undertaking the task.
What is faecal sludge?
When human excreta collects in a pit latrine, the solids settle at the bottom and form a slurry called faecal sludge. Over time the sludge accumulates and periodically needs to be removed and disposed of. This process presents several challenges because the sludge is offensive, a potential danger to human health and highly polluting if dumped indiscriminately into the environment. Faecal sludge management (FSM) is a set of processes designed to ensure that people and the environment are protected from these hazards. It includes the storage, collection, transport, treatment and safe end use or disposal of faecal sludge (Strande et al., 2014). FSM is a significant problem in towns and cities in many developing countries. Key issues are who is responsible for collecting sludge and where and how it is disposed of.