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Questions tagged [environmental-engineering]

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Solving Water Demand: Utilizing a New Calculator for Average Domestic Demand Given Total Storage Capacity

I recently found a calculator that helps determine the average domestic water demand given the total storage capacity of a system. I believe this tool could be beneficial for civil engineers working ...
ANKUSH SHIVHARE's user avatar
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31 views

I am using a bag house filter to filter particulates in cement industry. suggest an economical combined technology to filter the gases as well

I have designed the baghouse filter but I don't know what device should I install in combination with the baghouse such that it filters the toxic gases too. I saw a lot of technologies but the cost is ...
laiba's user avatar
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Calculating Mass Transfer Coefficient for Vaporization Rate

I've been tasked with estimating the evaporation rate of a theoretical spill of 32% HCl solution for the purposes of estimating worst case impact to indoor air quality. The worst case approach would ...
Ryan_C's user avatar
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2 answers
56 views

Lead Cladding on Telephony (landline) copper cables. Any other early industrializers with this problem?

A recent environmental hazard has just been uncovered this past week by the Wall Street Journal: "America Is Wrapped in Miles of Toxic Lead Cables" https://www.wsj.com/articles/lead-cables-...
Kiers's user avatar
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-1 votes
1 answer
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Why regulations on refrigerant and not on efforts in preparing standard for leak proof refrigeration system?

Refrigerants from CFC series are banned due to environmental concerns,but why not focus on preparing a standard for registration system which minimize or eliminate leakage? It must be difficult to ...
Crazy_Court651's user avatar
3 votes
2 answers
166 views

Is the Stop-Start technology detrimental or good for the car?

I found a lot of articles on internet about how bad the stop-start technology is for your car and how it contributes to the faster wear of multiple parts, or how superb the feature is for the Sacred ...
Honza Zidek's user avatar
0 votes
3 answers
265 views

Why not use sodium hydroxide to reduce carbon dioxide emissions?

The products of the reaction are useful. Renewables like solar power can be used for the electrolysis of brine. I don't understand why petrochemical companies are not using it as a scrubber?
Akira Akise's user avatar
1 vote
1 answer
29 views

what are some books/academic journals which I could read on renewable energy/technology? [closed]

Book suggestions on renewable energy technologies/sources
Arabella's user avatar
1 vote
1 answer
127 views

How much energy is needed for the USA to only use desalinated water?

What amount of energy would it take to replace the entirety of America's water consumption with desalinated water? And how does it compare with the country's current energy generation capacity? By &...
einnocent's user avatar
  • 173
0 votes
1 answer
41 views

Is it possible to avoid the emission of CO2 and other greenhouse gases from thermoelectric plants?

Since the deleterious effects of greenhouse gases are well known, I was wondering if it is possible, for example, for thermoelectric plants to avoid this kind of emissions. More exact, I think it ...
Landau's user avatar
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1 vote
0 answers
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Air Conditioner for an Acrobat Plane

What kind of Freon air conditioner would work upside down? Or somehow make it cut off and start working again when upright? I have a small cabin so it can be electrically driven. I know they have an ...
Justintimeforfun's user avatar
1 vote
0 answers
36 views

Solar Radiation Environmental Test Duration

I am designing an outdoor sensor and I need to test it for continuous outdoors service. One of the test I wish to perform is a solar radiation test for the actinic effect (like procedure 2 in MIL-STD-...
Eli's user avatar
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1 answer
49 views

Public data re possible estimate of baghouse efficiency. Plus characteristics of chromium emissions. Thanks!

I'm doing an article on a company whose Title V Operating Permit is currently under review by state regulators. (See biographical note below.) See also my specific questions, numbered below. Most ...
Daniel Forbes's user avatar
0 votes
2 answers
173 views

How is the Outlet flow rate in a water system controlled?

The Hardy Cross method for analysis of fluid systems assumes that in inlet flows and outlet flows for the system are known. However, when one constructs such a system in real life, how do we ensure ...
Kaninik Baradi's user avatar
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0 answers
17 views

can submersible pumps be used for leachate from landfill that may have some solid particles of size 15-20mm?

I would like to know if submersible pumps can be used to extract leachate from leachate wells. The leachate is likely to contain solids of size 15-20mm. Further the pump should have diameter less than ...
Nikash Naorem's user avatar
1 vote
1 answer
514 views

Calculating Chronic Daily Intake

I am studying for the FE exam and have come across a question regarding calculating cancer risk. I'm fairly certain that the answer provided has typos, but I'm not 100% sure. Here is the question: ...
Ryan_C's user avatar
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1 vote
0 answers
22 views

Referencing for Air Quality Monitoring

I asked the same question in electronics sub, but since it is more general I am asking it here again. I bought the Sharp dust sensor GP2Y1010AU0F. Below are the graph of readings indoor for ~5 minutes,...
Ziya Keskin's user avatar
4 votes
8 answers
613 views

How to install a wired sensor in a rotating bin without tangling the wires?

I want to insert couple of moisture, temp and humidity sensors in this bin to take readings from the compost. But how do i install it without turning/tangling the wires? Can anyone help me figure a ...
Vrushabh Chotalia's user avatar
2 votes
0 answers
37 views

Hazardous waste packaging

I'd like to ask an environemental question which has to do with waste packaging and the EU regulations that enclosure this subject I'd like to package loads of different hazardous wastes in ...
Johnnas's user avatar
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1 vote
3 answers
84 views

Mapping of vehicle to its horn sound

From the "meep meep" of the smallest scooter to the "BLLLAAAAAGGGGGHHH" of the largest seagoing container vessel, vehicles seem to have horn sounds that, in an auditory way, seem to indicate their ...
Douglas Held's user avatar
1 vote
0 answers
23 views

Adsorption - what models are used for dry scrubbing?

For scrubbing with activated carbon, air is generally brought through a dry adsorption media, where the contaminant is adsorbed onto the media. I would like to know what mathematical model is used ...
Mark's user avatar
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2 answers
40 views

How to retrofit seed starting trays to prevent root circling

I grow plum trees from pits using seed starting trays: Unfortunately, I have a problem where the roots of the seedlings grow in circles around the bottom of the cavities of the trays. The circling ...
User1974's user avatar
  • 399
4 votes
2 answers
328 views

Solving heat loss equation associated with solar trough concentrators

My project is about finding the efficiency of solar trough (cylindrical parabola) concentrator that will boil water in a pipe located at the focus (check picture please). In the process of doing so (...
Rachid Brah's user avatar
3 votes
1 answer
84 views

Store seeds at 1°C

I have prunus pits that I stratify in a refrigerator during winter. Normally, the seeds germinate in springtime, which is ideal. However, often some of the seeds germinate prematurely. When this ...
User1974's user avatar
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5 votes
5 answers
6k views

What colour of tarp will let in the least amount of heat?

Source: Low Tunnel Construction: How to Build a Mini Hoop House I have a small greenhouse that I want to keep as cold as possible in the spring. I plan to cover the greenhouse with a polyethylene ...
User1974's user avatar
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1 vote
0 answers
84 views

Design review needed for novel ion trap air scrubber / purifier concept [closed]

As a side kick I came up w/ a wet scrubber / air purifier design using trapped charged water droplets. I'm thinking about building a proof of concept but would like the community's feedback. ...
pauls's user avatar
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4 votes
3 answers
212 views

Prolong frozen ground conditions (to trick fruit trees into flowering later)

There is a common problem with fruit trees in temperate climates where the trees flower before the last frost. Generally speaking, if the tree has flowered, and the temperature drops below freezing, ...
User1974's user avatar
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2 votes
0 answers
71 views

How to select a smartphone IR camera for VOC monitoring [closed]

I am currently working on a problem involving volatile organic compounds (VOC) source monitoring on some oil and gas transportation environment. I think using infrared (IR) cameras could be a ...
Talles1988's user avatar
9 votes
5 answers
12k views

Humidity in home is much higher than outside

We have a two year-old, two-story town house with: fiberglass insulation in the walls; a Tyvek vapor barrier under foam board on the exterior walls; blown cellulose insulation in the attic; stucco ...
user avatar
0 votes
2 answers
115 views

Correlating relative humidity outside and inside an enclosure

I am building a device and I tried to Google an answer to this question but I am an electrical person and lack knowledge in this field. I need to know what the relative humidity inside an enclosure (...
Engineer_Cynic's user avatar
1 vote
2 answers
495 views

Why not use Sodium Hydroxide mist to precipitate carbon dioxide from hydrocarbon combustion exhaust

Much of the currently used techniques of scrubbing the carbon dioxide from power plant exhaust uses sophisticated amine and other organic compounds. These compounds are then forced to release the CO2 ...
0tyranny0poverty's user avatar
1 vote
2 answers
234 views

Do cars that automatically turn off engines at idle save any significant fuel?

There are many new cars now that automatically turn off their engines when stopped at traffic lights. They then automatically turn them on when moving off. These systems have many names along the ...
Paul Uszak's user avatar
2 votes
1 answer
8k views

Difference between surface loading rate and surface overflow rate of sedimentation tanks

Can anyone please explain to me the difference between surface loading rate and surface overflow rate when used during the design calculations of sedimentation tanks in water treatment plants?
user214671's user avatar
2 votes
2 answers
475 views

Is it better to throw used domestic cooking oil in toilet or within the garbage? [closed]

I recently asked a friend how I should recycle my used deep frying oil because I just don't have enough oil to justify taking my car, drive 20 minutes away to the waste collection site for few liters ...
nowox's user avatar
  • 293
1 vote
1 answer
91 views

How large of an area of the earth's surface would we need to cover in mirrors to negate global warming?

How large of an area of the earth's surface would we need to cover in mirrors to negate current levels of global warming? Let's assume that the reflective component of the mirror is made of aluminium ...
Stephen's user avatar
  • 113
4 votes
2 answers
833 views

Can solar panels absorb heat for energy?

Solar panels can absorb sunlight and use it for energy, but can they absorb the heat that is generated from their use and use the heat for energy?
Rishi Kavikondala's user avatar
1 vote
0 answers
51 views

Why have cascading vessels in the 'B' part of the 'AB' wastewater treatment process?

The AB process is wastewater treatment process that works like this: 'A Stage': Wastewater is (after mechanical treatment) subjected to a high load activated sludge process where also a lot of ...
mart's user avatar
  • 4,771
1 vote
2 answers
2k views

Can a retention/detention pond and a parking-lot be constructed in the same site foot-print?

Retention/Detention Ponds are often added to a site-design to mitigate storm-water runoff. Enhanced Porosity Concrete (EPC), aka Pervious Concrete, can be used as a parking-lot pavement that allows ...
D. Wade's user avatar
  • 111
1 vote
0 answers
54 views

Hazardous Chemicals Waste Recycling company & KOH production, ABANDONED the site [closed]

A Hazardous Chemicals Waste Recycling company & KOH production, ABANDONED the site, they cut (looks like with a diamond saw) the concrete floor (25cm height) at about the middle of the warehouse, ...
Nathalie Berg's user avatar
1 vote
1 answer
100 views

Thermodynamics of an Arctic Greenhouse

QUESTION For a business project, I'm looking into the viability of a greenhouse situated in Canada's far northern town of Iqaluit. The problem is how to mathematically simulate the internal air ...
Ben's user avatar
  • 111
6 votes
1 answer
10k views

How can I calculate the evaporation rate for a hazmat spill?

I was given formulas for general evaporation, for a spill calculator I am building. These are formulas, that are supposed to approximate evaporation, are for a number of different chemicals. ...
Duck's user avatar
  • 61
3 votes
2 answers
62 views

Nuclear wastegate thermal dissipation systems?

How do shoreline nuclear facilities lower the temperature of wastewater generated by their cooling systems before it enters the ocean?
BUzzBuzz's user avatar
8 votes
2 answers
105 views

Inexpensive and moderately accurate (field) method of measuring THC (Total Hydrocarbon Content) in water

I am working in a construction company which is building hydropower plants in Northern Norway. We are monitoring the Total Hydrocarbon Content (THC) of our process waste water. This particularly ...
Mikkel Bue Tellus's user avatar
2 votes
0 answers
39 views

In what ways could coastal cities like New York/Boston/Miami mitigate future sea level rises and maintain current dry land area? [closed]

We've all read articles on rising sea levels and the impact it will have on coastal cities in the coming decades. There are even maps that illustrate how varying levels of rising seas will impact the ...
Pete1187's user avatar
  • 121
1 vote
0 answers
66 views

What is the relation between the Biological oxygen demand and the depth of water tank? [closed]

I need a relation between Biological oxygen demand and depth. The ultimate [BOD] is known, and I need to calculate a [BOD] at any depth of water tank; temperature is constant. The tank is two meters ...
عبيده بني نصر's user avatar
9 votes
2 answers
293 views

Why does reducing the amount of emissions control improve the fuel economy of a car?

In addition to power and performance, one of the reasons VW cheated their emissions results was to improve the fuel economy of their cars. Why exactly does this happen? I'm familiar with cars and how ...
Kevin's user avatar
  • 93
3 votes
1 answer
542 views

Gas cleaning in activated carbon filters - How much moisture is needed and why?

Biogas and sewage (typically around 60% CH4, rest CO2) gas is typically treated in activated carbon (ac) filters to remove H2S and siloxanes. The ac filters need a small amount of oxygen (>0,4%) to ...
mart's user avatar
  • 4,771
4 votes
1 answer
119 views

Oval aeration tanks - what are they called, what are the key differences in operation to circular tanks?

Consider this overview picture of a WWTP: In the back, you see two oval tanks with bridges and walls, separating an inner from an outer area. These are aeration tanks. Is there a specific reason ...
mart's user avatar
  • 4,771
3 votes
0 answers
64 views

SBR-like reactors without decanters?

Sequencing batch reactors let sludge settle before drawing off the supernatant. For this, decanter arms are often used. An example is here. The challenge is to draw off the supernatant without ...
mart's user avatar
  • 4,771
0 votes
0 answers
39 views

Has large scale mono fermentation of sugar beets been achieved?

Sugar beets are an interesting substrate for biogas production due to their high content of easily digested sugars and starches. However, they lack macronutrients to sustain the bacteria population. ...
mart's user avatar
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