Thanks for an interesting and needed article about new ways of protecting the environment.
The biogas is a very good example as it generates energy and lessen the dependency on urban services.
The washing machine is just a continuation of what is done, nothing revolutionary. It is too small to be useful, continues to consume water and detergent, and is a time waster. There are other ways. Some time ago I can't recall where I saw a washing machine using ultrasound to do the work: no water, no detergent, protects the clothes and colors, and saves time.