There's a point when recycling gets problematic: about 25-35% of total trash recycled is a safe goal, and far more realistic in terms of quantity.
"Is zero waste, which means recycling nearly everything, achievable?” No, nor should it be.
There are several categories of
recyclable materials: type (recycle standard scale 1-5, 5 being best) - details
Plastic (4) - though seemingly obvious, there are actually only a few types of plastic that can be recycled or that contain recycled plastic.
This shows the various symbols that identify plastic types. Of these types 1 and 2 are widely accepted in container form, and type 4 is sometimes accepted in bag form. Code 7 is for mixed or layered plastic with
little recycling potential. #5 "open top" containers (yogurt, cottage cheese, strawberry baskets) are hard to avoid buying, and mostly useless for recycling. Many curbside collection programs won't complain if these are placed in a bin, but they won't recycle them either.
Glass, Steel, Aluminum Cans and Foil (4) - Glass bottles must not be mixed with other types of glass such as windows, light bulbs, mirrors, glass tableware, Pyrex or auto glass. Ceramics contaminate glass and are difficult to sort out. Clear glass is the most valuable. Mixed color glass is near worthless, and broken glass is hard to sort. These are reasons why glass recycling can be difficult and may seem too costly in the long run, but the cost is mostly upon people's time more than anything.
Scrap aluminum is accepted in many places. Other metals are
rarely accepted. So definitely do those soda cans, but other metals you may as well not bother unless you're sure your town's recycling center is equipped properly.
Aseptic Packaging (Drink boxes, soy-milk containers) (2) - Aseptics are made from complex layers of plastic, metal and paper. The aseptic industry has spent millions in public education on the issue of aseptic recycling, including distribution of classroom guides and posters like "Drink Boxes are as Good on the Outside as They are on the Inside" and "A Day in the Life of a Drink Box" (lol!). The actual recycling process, unfortunately, is very expensive and awkward, and is therefore only available in very few places.
Paper (5) - Most types of paper can be recycled. Newspapers have been recycled profitably for decades, and recycling of other paper is growing. Virgin paper pulp prices have soared in recent years prompting construction of more plants capable of using waste paper. The key to recycling is collecting large quantities of clean, well-sorted, uncontaminated and dry paper. This again requires more time for people to pay attention and make an effort.
Old refrigerators, Heat Pumps & Air Conditioners (2) - Most people are too lazy to care about the CFCs that may be in their old units, but this chemical should absolutely be recycled -before- disposing of the appliance. Most appliance removal specialists will preform this service, but your town garbage man won't and as a result may not even take it away (hopefully). Proper CFC removal is mandated internationally.
Single Use Batteries (Alkaline, Heavy Duty) (2) - The Copper Top, unfortunately these cannot be "recycled" much rather they are collected nowadays and stored in a special landfill. Using these at all is just not a good idea if you can help it.
Rechargeable Batteries (other than car batteries) (3) - A far better alternative, low self discharge battery such as Nickel-metal hydride (NiMH), Lithium-ion (Li-ion) or Nickel-cadmium (NiCAD), all of which are rechargeable and easily recycled if they become defective. Though most cities have banned these from entering landfills due to the toxic chemicals (cadmium poisoning for instance), there is not necessarily a convenient drop point for these.
Motor Oil, Tires and Car Batteries (5) - A must to recycle and by law in most states, these are easy to recycle. Though charges can apply such as Walmart's $0.05/quart oil fee or a $1.00 state tire recycling fee, this is a small price to pay for avoiding hazardous waste issues.
Compost (5) - Rather than purchasing manure, just make your own! Collecting yard waste (leaves, grass clippings, etc.) will contribute quickly to a compost heap, and provide an excellent source of soil nutrition for any gardening requirements.
On another note:
Biomass briquettes - made of various sorts of raw material including rice husk, bagasse, ground nut shells, etc. use has increased as industries realize the benefits of containing pollution with favorable economics. Briquettes provide higher calorific value per dollar than coal used for firing industrial boilers.
In summation, it's important to recognize when recycling does more harm than good, which is the case with a few of the above examples. But when the only "cost" is effort and time spent, well, there's little I can find to support that being evidence enough to warrant stopping that particular recycling.