“How can we improve soil health by applying a top layer of materials?”
People have been stewarding plants since the dawn of agriculture. One of the biggest determinants of vegetative productivity is soil quality. The higher the quality of the soil, the better the planting outcomes achieved. So what if we could apply a top layer of material to improve soil quality? Well, people have been doing through Mulch. Mulch materials improve soil quality through better soil moisture conservation, reducing weed potential, and enhancing fertility. Examples of mulch include grass clippings, compost, and hay.
“How do we encode soil conditions from a soil boring test?”
Engineers perform soil boring tests to understand subsurface properties. This information is categorized into Soil Boring Logs. Soil boring logs detail the subsurface lithology, rock density, grain size, and moisture content. Soil boring logs also provide information on groundwater and aquifers encountered in the drilling process.
MS4 systems are a wonder of modern technology. In the U.S., whoever owns and operates these systems, whether it’s a city, county, or some other entity, are designated as an MS4 Operator. MS4 operators are legally required to develop and maintain a stormwater management program and to review stormwater pollution prevention plan applications.
“How do municipalities plan for stormwater management?”
Nearly every part of the world receives stormwater, whether it’s the Syrian desert or the Amazonian Rainforest. The runoff from this stormwater can carry pollutants from municipalities to nearby water bodies. Towns and cities are required to devise a plan for managing stormwater pollution transport. In the U.S., these plans are called Stormwater Management Programs (SWMPs). The Clean Water Act requires public entities that operate MS4 systems to develop stormwater management programs.
“How does the EPA classify water bodies that don’t meet water quality standards?”
Water bodies all over the world have different levels of pollution. In the U.S., some water bodies are so polluted that they don’t meet water quality standards, leading the EPA to classify them as Impaired Water Bodies. Impaired water bodies are eligible to have a total maximum load pollution limit and environmental review for projects that may impact them to protect against further degradation.
“Are there sewer pipes so big you can walk through them?”
Main sewer lines carry water from home lateral pipes to more centralized zones. These main lines usually feed into Trunk Sewer Lines, large diameter pipes that feed into wastewater treatment centers or even . Trunk sewer line diameters can be so big that a person can walk through them, but the gas released from the raw sewage is dangerous enough that people will need to wear protective equipment while walking through. Trunk sewer lines are more likely to fail than smaller diameter pipes because of their large size, forcing municipalities to take extra care of these assets.
“How can plumbers clean and inspect the pipe connecting homes to municipal sewers?”
Lateral sewer lines connecting homes to municipal sewers become clogged from time to time. If this is not addressed, the clogging can develop into blockages and long-term damage to the piping infrastructure. So how can we use our engineering mindset to quickly clean the home piping without ripping out the existing piping and landscaping systems? Well, what if we were to install a vertical pipe on top of the lateral sewer line with an unlockable surface opening? These services, called Sewer Cleanouts, allow licensed plumbers to inspect and clean home pipes. Sewer cleanouts often appear as white capped pipes sticking up from the ground.
“What pipe connects houses to the municipal sewer system?”
Connecting a building to a municipal sewer system is one of the most common ways to implement high-quality sanitary access. Lateral Sewer Lines, or sewer pipes that extend from a building’s waste system to a municipal sewer main, are an excellent way to accomplish a home-to-sewer connection. Lateral sewer lines are typically located on private property, requiring the owners to assume responsibility for theirmaintenance. Laterals are tyoically sloped downwards to transport waste through gravity, and can become clogged by tree roots, grease, and other factors.
“How can we measure how long on average microorganisms spend in a wastewater reactor?”
Microorganisms are the backbone of wastewater reactors. These microscopic solids work hard to clean incoming wastewater to suitable environmental levels. But these pieces of biomass only have a limited amount of time in the reactor as solids are ejected from the treatment system. The average amount of time a microorganism spends in the reactor, known as the Solids Residence Time, is equal to the total biomass within the system divided by the exit flow rate of biomass. We can represent this relationship with the formula SRT = Total Volume of Biomass/(Waste rate of biomass + Effluent rate of biomass). A low SRT indicates a reactor is quickly cycling through biomass, which leads to a mostly young bacteria, while a high SRT has the opposite properties.
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