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Primary Treatment of Wastewater

Aims of primary treatment of wastewater is to separate suspended solids and greases from wastewater. What does primary treatment of wastewater remove? Sedimentation remove both organic and inorganic suspended solids. In addition, skimming, as part of sedimentation tank, remove grease, oil, scum, and floating solids.

Primary treatment of wastewater includes primary sedimentation (also called clarification), microscreen, Imhoff tanks. In most facilities, primary treatment is used as preliminary step ahead of biological treatment. Read More

Wastewater Treatment – How Wastewater is Treated

In earlier posts, we learned sources of wastewater, which are domestic wastewater, industrial wastewater, and infiltration/inflow. In this post, I want to share to you how wastewater is treated.

Wastewater is treated at wastewater treatment plants before it is permitted to be discharged to the environment/water bodies. Basic function of wastewater treatment is to speed up the natural processes of water purification. Read More

Where Does Wastewater Come From

Where does wastewater come? This basic question shall be answered if we want to design a wastewater treatment system. Source of wastewater, its characteristics, and its flow rate, will influence the type of technology to treat the wastewater.

Components that make up the wastewater depend on the type of collection systems. Urban wastewater that contribute to a wastewater treatment is originated from the following three main resources:

  • Domestic (also called sanitary) wastewater. This type of wastewater is discharged from residential districts, commercial districts, institutional facilities, or recreational facilities.
  • Industrial wastewater. Wastewater which predominantly consists of industrial waste.
  • Infiltration/inflow.
    • Infiltration is water entering a sewer system including service connections, defective pipes, pipe joints or manhole walls.
    • Inflow is the water discharged into a sewer system from roof leader, cellar, yard and area drains, foundation drains, cooling water discharges, drains from springs and swampy area, manhole covers, cross connections from storm and combined sewers.

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What Is Wastewater Treatment  

After a quite long absence of updating this blog, I want to begin this March’s post with refreshing our knowledge about wastewater treatment. Let’s begin with one fundamental question: what is wastewater treatment?

In general, wastewater treatment is a process converting wastewater into effluent that can be discharged back into the environment. This terms contains at least four keywords, which are wastewater, effluent, converting process, and environment.

Sewage wastewater

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Get to Know Glycol Dehydration Unit

Natural gas dehydration unit is one of important facilities in natural gas processing. Purpose of water vapor removal in natural gas are to prevent gas hydrates formation and to reduce corrossion in pipeline. There are several methods of gas dehydration, which are absorption with liquid desiccant, adsorption with solid desiccant, and cooling below initial dew point. Selection of the method is depend on water content in feed gas and required dew-point in dry gas.

One of the most popular methods of natural gas dehydration is absorption process employing diethylene glycol or triethylene glycol as dehydration medium or desiccant. It is a mature process having been used for over fifty years. Triethylene glycol has emerged as the most popular chemicals in recent years due to several favorable desiccant characteristics. Those characteristics are high affinity for water vapor, non-corrosive, ease of generation, and low chemical losses. Read More

Attending Microhydro Workshop in CRCS ITB (Part 2, End)

This post is continuation of my first post about my participation in workshop on microhydro power plant in national seminar on instrumentation, control, and automation. Please read the first post first to get overall picture of the workshop.

I am lucky to see some of main equipments in microhydro power plant workshop. Picture below is example of microhydro power plant for study purpose. Read More

Attending Microhydro Workshop in CRCS ITB (Part 1)

On 11-12 December 2018, I had an opportunity to participate in national seminar on instrumentation, control, and automation, as well as microhydro workshop. This event was held by CITA ITB (Center for Instrumentation Technology and Automation Institut Teknologi Bandung, Indonesia). It was a really awesome event, especially workshop on microhydro. In this post, I want to share to you what I got from the workshop. Read More

Cooling Pond Sizing

In this post, I want to share to you how to size cooling pond. Cooling pond is used to remove heat from water by means of air. Example of application of cooling pond is to remove heat from brine water in geothermal power plant facilities.

To design cooling pond, you need process data and environment data. Process data are flow rate of liquid to be cooled, initial temperature, final temperature, and density of liquid. Environent data are relative humidity, wind velocity, average air temperature, and solar heat gain. Here is example of cooling pond sizing. Read More