Plastics products are ubiquitous throughout the world. As dependency upon these light weight and durable products increased, so too has the need for global innovation in recycling technologies. Over the decades recycling companies developed a variety of processes to turn discarded plastics into hundreds of products from paint brushes to rugs and pillows, boat hulls and railroad ties.

Calling the Consumer

The greatest challenge to recycling manufacturers is educating and engaging the public. About 75 percent of Americans recycle newspaper and cardboard while little more than 25 percent recycle plastic. Industry analysts think this low response rate might be due to a lack of understanding about the coding on recyclable plastics – the small triangle with a number in the center – that identifies what kind of plastic an item is.

The most frequently recycled plastics of the seven groups of polymer plastics are PET 01,used in soft drink bottles and smaller jars; PE-HD 02, a harder and more durable plastic used in milks bottles and large trash bags; and PE-LD 04 that’s tough yet flexible and used in frozen food bags, flexible container lids and squeeze bottles.

Although the recycling rate of these and other products is not yet impressive, the numbers have been steadily rising since 1990. In 2006, about 2.2 billion pounds of PET plastic bottles were recycled and 928 million pounds of HDPE (High Density Polyethylene) containers made it to recyclers.

Innovating PET Production

As awareness of the environmental damage done by polymers increased, so too did the urgency to encourage recycling. At the same time, experimentation with processing and application rose. For example, according to a CNN report, a Ph.D. in India, Dr. S. Madhu, included shredded and melted plastic in a roadway surfacing mix. Working for the Kerala Highway Research Institute, Madhu mixed the plastic with aggregate and bitumen to create a surface that withstands the pounding of annual monsoon seasons.

Working in a highly regulated environment, conventional recycling manufacturers focus on producing a long list of common products. Although processes vary, they generally follow a common methodology. First, plastics are sorted according to their PET identification number. This is often done before the recycled products reach the manufacturer. The “dirty” PET containers are also cleaned of labels, glue and other residual materials. A dirty regrind of the PET then goes to re-claimers who process the material into a form that can be used by manufacturers. Re-claimers further clean the materials of contaminants and materials that are lighter than the plastic. The final flakes of PET are washed with a special detergent that gets rid of glues, food or dirt.

Next, the PET materials are further treated with processes that separate the heavier PET particles from the lighter ones – this is called the float-sink stage. The plastics are then dried and ready to become new products in the hands of manufacturers throughout the world.

But, new methods are constantly being developed to recycle PET products, including a de-polymerization process that “reverses” the chemical process used to make the polymer. There are pilot projects using this method, as well as other innovative processes to make plastic recycling more environmentally friendly and economical.

Demand for Recycled Products

The importance of recycled PET and HDPE cannot be ignored. The latter, heavier PET is used to make building materials that become backyard decks that last longer than wood; it becomes lawn furniture, trash cans, office products, buckets, safety cones and much more. HDPE can also be used to manufacture above and below ground water storage tanks that withstand decades of use.

Of five major classes of PET plastics, the most high-end use is to manufacture new PET bottles and containers. Other classes include plastic sheeting or plastic that’s used for molding small items such as scoops for laundry detergent; strapping materials for packaging and transportation; resins that are used in molds for automobile components; and material that’s combined to make fibers for carpeting, fabrics and fiber fillings.

Recycled PET can show up in unexpected places such as business cards, sleeping bags, baseball caps and the welcome mat at your front door.

In the Hands of the Consumer

Ultimately, it’s all up to the consumer. Awareness of the environmental benefits of recycling plastic and the viability of manufacturing with recycled PET can mitigate environmental damage and support a global industry that returns economical and useful products to the marketplace.

In the U.S., many municipal governments have made it easier for consumers to recycle plastic. Cities accept all plastic products with the recycle symbol and do the sorting themselves before shipping off for further processing. The consumer doesn’t have to deal with separating PET numbers or peeling off labels. Many states have passed legislation commonly known as “bottle bills” that charge a small fee for plastic containers. There is greater value to the consumer to recycle when there is the incentive of a redemption value. Some communities have “drop off” recycling centers and others have “buy back” centers that pay consumers for recyclable materials.

Whatever the method of recycling or the process that recreates value from discarded PET products, it’s clear that the public, governments and industry share a financial and environmental stake in the practice of plastic recycling.

Solar power energy systems are not inexpensive. That said it’s important to compare them within context of other types of home improvement projects. Home buyers and realtors view a solar photovoltaic or solar hot water heating system as a significant value-added improvement â?? similar to adding a deck or remodeling your kitchen. Plus unlike a deck or kitchen remodel, you also gain one-up on your power bills. Here are some foolproof ways to estimate the cost of a solar photovoltaic or solar thermal system and to figure out if a solar energy system makes sense for you.

Six Easy Steps To Estimate Cost of a Solar Power System

Solar power energy systems are not inexpensive. That said it’s important to compare them within context of other types of home improvement projects. Home buyers and realtors view a solar photovoltaic or solar hot water heating system as a significant value-added improvement â?? similar to adding a deck or remodeling your kitchen. Plus unlike a deck or kitchen remodel, you also gain one-up on your power bills.

Solar power systems often get an additional financial boost as well: many jurisdictions and utilities across the USA offer attractive financial incentives to drive down the upfront capital costs associated with a solar power system.

Here are some foolproof ways to estimate the cost of a solar photovoltaic or solar thermal system and to figure out if a solar energy system makes sense for you. Let’s start with a home photovoltaic (PV) system.

Step 1: Estimate your home’s electricity needs

To get started, it’s good to have a sense of how much electricity you use. You’ll have a better point for comparison if you find out how many kilowatt hours (kWh) you use per day, per month, per year. Your utility bill should include that information.

Of course, the utility bill will also display your costs and many utilities include a graph that displays how your monthly energy use/cost varies throughout the year. That helps you estimate where your highest energy use is and at what time of year.

New Home Construction

If you are constructing a new home, then you’ll need to estimate your demand based on the type of equipment you plan to install and your home’s square footage. The pross call this “your load”.

To figure out your anticipated load, create a table to record the watt use for each appliance. Each appliance â?? be it a water heater, electric light, computer, or refrigerator â?? should have a nameplate that lists its power rating in watts. Or you can get the information from the manufacturer’s website.

Some labels list amperage and voltage only; to obtain watts multiply the two together (amperage x voltage = watts). In another column, record the number of hours each appliance is expected to operate. Then multiple the watts and hours together to estimate watt-hours used per day. Since it’s hard to anticipate all electric loads (it may get tedious scouting out every toothbrush and mobile phone cell charger), you might want to add a multiplier of 1.5 to be safe.

Step 2: Anticipate the future

In 2005, average residential electricity rates across the USA ranged from about 6 to nearly 16 cents per kilowatt hour depending on where you lived. Average retail and commercial electricity rates have increased roughly 30% since 1999 and the upward trend will likely continue especially as costs for the coal and hydropower used to generate that electricity rise as well. So think about your home electricity needs and present and future cost in relation to one another.

Step 3: How much sun do you get?

The Florida Solar Energy Center has conducted a study to examine how a 2-kW photovoltaic system would perform if installed on a highly energy efficient home across the continental USA (http://www.fsec.ucf.edu/en/publications/html/FSEC-PF-380-04/).

The study accounted for all factors that impact a PV system’s performance such as the temperature effect on the photovoltaic cells, the amount of sun peak hours in various regions, and the efficiency of inverter to convert solar derived energy from DC to AC.

As the study implies, solar photovoltaic systems work just about anywhere in the US. Even in the Northeast or in “rainy Seattle”, a pv system can pencil out if designed and installed properly. In New York or New Jersey, a one kilowatt system should produce about 1270 kilowatt hours of electricity per year, in Seattle, a one kilowatt system should produce about 1200 kilowatt hours per year. In the Southwest, of course, those ratios will be much greater.

Solar contractors in your area can help determine the best size for your solar photovoltaic system.

Step 4: Size your system

In general, solar photovoltaic systems sized between 1 to 5 kilowatts are usually sufficient to meet the electricity needs of most homes. One advantage of grid-tied systems is that you can use solar PV to supplement or offset some of your electricity needs; therefore you can size your system to match your budget and always add to the system later if needed.

Also as a side note, here’s a rule of thumb to remember to help you estimate the physical space your PV system might need: one square foot yields 10 watts. So in bright sunlight, a square foot of a conventional photovoltaic panel will produce 10 watts of power. A 1000 watt system, for example, may need 100 â?? 200 square feet of area, depending on the type of PV module used.

Step 5: Know your rebates

Many states and local jurisdictions offer rebates, tax credits and other types of incentives to homeowners for installing residential photovoltaic and solar domestic water systems. To view a comprehensive database of the incentives available for renewable energy visit http://www.dsireusa.org.

At the Federal Level, you can take advantage of a 30% tax credit (of up to $2,000) for the purchase of a residential solar system at least until December 31, 2008.

Step 6: Run the numbers

Although the cost for a solar PV system will depend on the size of the system you intend to install, your electricity rate, the amount of kilowatt hours you expect to generate, and the state/local rebates/tax credits that may be available, the formulas for calculating the returns are pretty much the same.

For those who appreciate having the formulas, use the ones listed below to do a quick ballpark estimate of how much a solar photovoltaic system might cost you.

Retail Price for Solar Photovoltaic System

+ Building Permits

- $2,000 Federal Tax Credit

- State or Local Tax Credit or Rebate

- Utility Rebate or Other Incentive

= Net Investment

Kilowatts of electricity generated from PV per year

x Kilowatt hours used per year

= Annual Kilowatt energy from the PV system

Annual Kilowatt energy from the PV system

x Current Residential Electricity Rate

= Annual $$ Saved

Yearly Excess PV Energy Produced

x $$ credit applied per watt

= Annual Value from Net Metering

Of course, a more accurate assessment can be made by a pro. Work with a solar power contractor to size and price the right system for you. As is true with any major purchase, don’t hesitate to ask for several bids from different contractors.

Many solar power providers will provide you with a comprehensive estimate. Helpful information to know includes:

- Total cost to make the system operational (labor cost for design and installation and equipment costs)

- Equipment (Make and Model)

- Warranty info

- Permit costs, if needed

- Tax, where applicable

- Federal tax credits

- State or local jurisdiction tax credits or rebates

- Utility rebates

- Expected Renewable Energy Certificates or Net metering credits

- Expected operation and maintenance costs

- Projected savings

Solar Thermal (also called Solar Hot Water)

Solar thermal systems capture the sun’s energy to heat water and are one of the most cost-effective renewable energy systems. They are used to heat hot water tanks and/or a heating system. A solar pool heating system is another type of solar thermal system designed specifically to heat a pool or hot tub.

Generally it’s worth investigating the economic viability of installing a solar hot water system if you have an electric water heater with utility rates of at least 5 cents per kilowatt hour and have tax credits or rebates available. (It may even be worth changing out a gas-powered water heater if your costs are at least $8/million BTU).

The formulas for costing out a solar water heater system are similar to estimating the cost for installing solar PV system. Many solar energy professionals can help you determine what system might work best for you.

Heating Your Swimming Pool with Solar Power

Although few jurisdictions provide financial incentives for using solar energy to heat a swimming pool or hot tub, in general, using solar power to heat your pool is a “no-brainer” from a return on investment standpoint.

The electricity used to heat a pool during the swimming season often amounts to the same amount of energy that homes-without-pools consume over a year. Combining a solar thermal system to generate heat for the pool with a solar thermal pool cover to retain the heat generated can further maximize efficiencies and extend your swimming season.

Most installers recommend that a solar collector used to heat a pool is sized at roughly half the square footage of your pool surface area. Solar thermal panels typically last 10 â?? 20 years and come with a 10-year warranty.

How long it takes to break even on the cost of your solar power pool system depends on where you live. In California or other parts of the Southwest, you’ll break even in 1 to 3 years but places as “far north” as Canada, a solar pool heating system pencils out over a slightly longer period of time.

I would like to compare the costs of the energy costs of the fuels we use today (non renewable) to the current cost of green energy (solar wind water etc). What is the best way to do this?

The book is target to executives in large & small corporations. The author offers strategy advice & what executives can do right now to make a difference. And so… So far so good. What I like is the author does not just focus on the problems, rather he focuses on the solutions. The book is written in an easy to understand fashion & the topics are present in a way that is easy to digest. The book gives a step by step guide for business to tackle a wide range of issues form climate issues to alternative energy. The author does a great job of delivering the message that these green initiatives will not just help the environment, they will also help the bottom line. The author demonstrates how corporations can save millions of dollars $ $ a year by making minor adjustments in their business strategy.

I recommend this book to & executive in any company. This should be required reading in business school because this is information every future executive will need to know to do business in this era.

Dan Keller is the CEO of the popular Green Jobs site & also runs a site that focuses on jobs for teens

]]> http://largie.com/blog/2010/03/strategies-for-the-green-environment-book-reviewby-dan-keller/feed/ 0 http://largie.com/blog/2010/03/what-products-should-i-avoid-if-i-am-trying-to-go-green/ http://largie.com/blog/2010/03/what-products-should-i-avoid-if-i-am-trying-to-go-green/#comments Wed, 10 Mar 2010 19:42:34 +0000 largie http://largie.com/blog/2010/03/what-products-should-i-avoid-if-i-am-trying-to-go-green/ i am doing a school project on green products that people should use. we are making a commercial so i was trying to find products that are bad for the environment to compare to. so if you know of any that are harmful to the environment, please list! thanks!