Monthly Archives: November 2013

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Pungent Taste of Chile

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The Pungent Taste of Chili

The taste

Chili_BellpepperIt is an old wisdom that you taste with the tip of your tongue and that the sense of taste, is a natural guideline towards proper nutrition. I personally believe that there is lots of truth in that. The various tastes normally known are: SWEET, SOUR, SALT, BITTER, PUNGENT AND ASTRINGENT

Well, peppers or chilis do have a definite pungent taste, the hot ones at least. There are some thirty species, including some with erroneous names, The genus is Capsicum and the most common species are annuum, frutescens, chinense (erroneous), pubescens and baccatum. The common name are chili, chile or chilli, chilly, all are correct and used in different languages.

A “pseudo” taxonomist thought he found a new specie in China and called it chinense. All species of Capsicum are indigenous to the Americas, PERIOD. Chilis were reported from central and south America for thousands of years ago

Let us go back to my subject. The pungency of chilis is expressed in Units of the Scoville Scale.

Wilbur Scoville was a pharmacist of Parke Davis Labs around 1912 and designed the scale around a principle, measuring the degree of pungency diluting the source with sugary water, until the taste disappeared. The more delution needed the higher the degree of pungency the pepper has. This system works, but was later replaced by a more scientific method to measure, although the results were still expressed as Scoville Units.

The substance producing the pungent taste is capsaicin and has in pure form 15-16,000,000 Units, Bell Pepper/Paprika has 0-500 Units, Jalapeño and Chipotle up to 9,000 Units, Madame Jeanette, Habanero up to 300,000 Units, Adjuma up to 575,000 Units and the hottest peppers between 1,000,000 and 2,000,000 Units. Hot stuff hey.

What to do if you got an overdose of chili? Take no water if you swallow it, you will make it worse. Take small amounts of cold milk or yoghurt, every two or three minutes. Cocoa butter on your lip also helps, refresh from time to time.

If the contact is external, use lots of soapy water to wash it of. The substance is hydrophobic, also the reason for not using water internally.

The capsaicin content is at the highest level as the fruits are fully ripened. The seed strings contain an average of 79%, the seeds 13% and the skin 8% of capsaicin. In all cases always remove the seeds, they may damage the inner tissue of the stomach. It sure stimulates your appetite.

Enjoy your chili and if you have any questions, let me know, or just like it, I may be motivated to write a follow up. Chili and diseases, chili and health, chili and diet, chili against pain etc.

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Soursop Fruits

Soursop – Myth and Truth

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Soursop Myth and Truth

Soursop belongs to the plant family Annonaceae, genus Annona and the specie muricata. To the same genus belong the sweet apple and the cherimoya, the latter from the higher regions of the Andes.
The fruit of the soursop is used to prepare a delicious refreshing juice, for special icecreams and joghurts. The fruit is known in other languages as zuurzak, paw paw, guanábana, sauersack, sirsak, durian belanda, anona, graviola etc.

Many medicinal properties are ascribed to this fruit by different people around the world, but scientifically these are exaggerated for now, as this genus is really under investigated. Drinking the juice gives one a calming effect and has a slight diuretic effect. Some believe that the pulp of the fruit is having positive effect on the repair of cells. There are more studies underway as lots of people around the world have high expectations and are anxiously waiting for answers. Their are some potentials as various metabolites were found.

It is a given fact though, that the seeds are not suitable for human consumption. They contain a highly concentrated neurotoxin, named Annonacin, which seems to have a connection to neurodegenerative diseases. As such a University in the Caribbean linked this toxin to an atypical form of Parkinson´s Disease. Avoid shredding the seeds when preparing the pulp in the blender.

The pulp is very thick and could easily be diluted at a 2:1 ratio. It is not yet well known if the pulp also carries some of the neurotoxin, so drink this very refreshing juice sparsely.

Reference: Soursop – Myth, Truth and Hoax

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Orangutans

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Orangutans From Kalimantan and Sumatra, Indonesia

These primates are seriously endangered, mostly due to logging, loss of habitat and poaching.
The Orangutan population is dwindling, Sumatra has some 6,500 and twice as much are left over in Borneo, now called Kalimantan.  The species are respectively Pongo albelii, with reddish colored hair and Pongo pygmaeus, with brownish colored hair. Orangutan is derived from the Indonesian words Orang for Man and Hútan for Forest. Thus Man of the Forest. The Orangutans share 97% of their DNA with humans.

Bornean Orangutan 1

Borneo Orangutan

Sumatran Orangutan 1

Sumatra Orangutan

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PhylogeneticTree

See the Phylogenetic Tree, to know the evolutionary relationship of the primates. The Orangutan is the largest arboreal creature on the planet. They can’t survive elsewhere, as many tigers are roaming around in the same forest.  The ones from Sumatra are in general more social, although the male normally lives a solitary live. The offspring accompany the mother for some eight years. The orangutans of Kalimantan are also suffering losses due to poaching, illegal logging and loss of habitat.

In Northern Sumatra, 80 km west of Medan, I visited the Gunung Leuser National Park, a UNESCO World Heritage Site, near Bukit Lawang. Bukit means Hill or mountain top and lawang means door or in this case gateway.  I stayed overnight in the guesthouse near the entrance of the park to be able to participate in an early mountain trip to the feeding site for the orangutans. On the way is a small compound where orphans are treated, fed and trained

The work of the biologists, who are trying to save these creatures, is a very important task. Due to poaching and other malicious behavior small orangutans frequently are ending up as orphans.  The biologists are taking care of them in 9 sanctuaries in North Sumatra and Aceh province, where they do not just have to teach them what to eat, but also how to eat it. In absence of their mother, who teaches them everything during many years, the caretakers have to show them also how to behave for their own safety and have to frequently do those things their mother normally would teach them by example. This is the only proven way to make re-adaptation in the wild a success. I would also therefor ask to donate to their organization to keep up this beautiful work.

While visiting the feeding site for those who live in the wild in this park, there were already quite some orangutans gathered. There was at least one female, two babies and a very suspicious male. The latter kept watching the visitors behind there fence. A cameraman, with lots of video equipment, posted his tripod near the fence. All of a sudden the male moved in near the video equipment and the public rapidly backed up away from the fence. He evidently only had some thoughts of his own and luckily was not really aggressive, sat there, near the camera, with a face as if he wanted to say: “what do you think of me, this is my territory, you know”.  All in all it was a very fine and gratifying experience.

These animals must be saved, from poachers and individuals, who want to cut down the forest to establish plantations such as oil palm etc. Although an adult Orangutan has a strength of up to 7 times, that of humans, they are defenseless against these intruders in their habitats.

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Some Thoughts About Management Of Organic Waste 3

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Some thoughts about the Management of Organic Waste – Liquid and Solid.

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Biogas

 Bio gas is the product of anaerobic (in absence of air), digestion of organic material at various temperature ranges, depending on the outside temperatures, de type of material and the methanogens, which are decomposing this material.  There are numerous methanogens for different materials, temperatures, acidities etc. It at times will be necessary to start a culture if optimal results need to be obtained. This is especially the case in complex processes like slaughterhouse residues.

 Biogas consists of an average of 55 – 65% Methane (CH4) and 30 – 40% Carbon Dioxide (CO2). Further may contain Nitrous Dioxide (NO2), Hydrogen Sulfide (H2S), Sulfur Dioxide (SO2),   and traces of others. Safety Note: H2S should be dealt with, as it is aside from highly toxic also very flammable and corrosive. It may damage biodigesters and cause leaks, with dangerous results.

The compound of the captured gas depends a lot on the input material. If more woody material is used, obviously this will raise the CO2 content, while high protein material, influences H2S formation and so more. There are cures for many of these challenges.

It serves to determine the chemical composite of this input material. Not only to predict the composition of the output, but also to avoid feeding high levels of toxins as this might kill the “workers”, the bacteria or methanogens. This will immediately affect the gas production.

The gas can normally be used for generating electricity, heating and cooking, with the use in equipment with special nozzles. It is used for this reason in rural areas and thereby replaces wood and charcoal equipment, which is an enormous gain in eliminating emission of smoke,  CO2 and other contaminants, affecting the health of individuals.

Biogas Upgrade

 Although in many cases the output gas can be used as is, it may be necessary to upgrade the gas if used in engines. It is essential to remove most of the CO2 gas and also get rid of any Sulphur oxide  and remnants of H2S, as this affects moving parts and oxidation/erosion of most metals.

It forms with the catalyst, nitrous oxide, the acid H2SO4. Sulfur Dioxide is also a minor Greenhouse Gas. It is recognized by the strong pungent, choking odor. Already in the biodigester process a chemical compound, Ferro Chloride (FeCl3), can be used to precipitate the Sulphur or Sulfide into elemental, insoluble sulphur, avoiding most of it to enter in the output gas. The rest will be removed in the following step. So there are ways of getting rid of solids and other unwanted gases too.

There are various technologies in use, to upgrade biogas to renewable natural gas, with methane contents of 90 to even 98%. The most common are:

  •  Water scrubbing, most used practice
  • Chemical scrubbing, using amine solutions
  • Pressure Swing Adsorption (PSA)
  • Temperature Swing Adsorption (TSA)
  • Membrane technology, There are two membrane separation techniques: high pressure gas separation and gas-liquid adsorption
  • Finally a better alternative is to use biological purification, less cost of investment and operation.

 Conclusions

 With overwhelming evidence that the globe is heating up and  all negative effects of that, it should be a must for everyone to participate in those measurements to mitigate the emissions of the gases causing this effect. With the right mindset, the task can be done. The longer we wait for action the greater this task will be.

Let us see to it that organic matter in our community is properly handled. There is now sufficient information available to do just that. Removing the gases in this material, should reduce the concentration in the atmosphere and as an important side result, provide a cleaner energy source.

Ordinary organic matter can be fed to the proper biodigester to produce methane gas and a cleaner organic fertilizer for traditional purposes. This material may consist of herbaceous plant material and animal waste at a 15 to 1 ratio.

The residues of slaughterhouses will have to be handled through biodigesters to avoid affecting public health in the most extended way possible. Sweden has some 15 year experience in this matter and applied for many patents. There are lots of challenges, but there are also solutions.

The Biogas produced, consists of an average of 60% Methane gas, 30 Carbon Dioxide and some other trace gases. Although this biogas can be used for heating and electrical energy generation, it is advantageous also to remove these trace gases from the biodigestion stage into the upgrading stage, to end up with renewable natural gas, with a methane content up to 98% and a much improved caloric value. As a fuel, this causes 50% less CO2 emission compared to fossil fuels and can be used in moving and stationary industrial energy applications, as is, or compressed in cylinders.

Imagine a rural world, where people can just flip a valve and start preparing their meals instead of having to start a polluting wood or charcoal fire. Imagine a city or other community where the garbage is no garbage, but properly separated and the organic matter used to produce renewable natural gas, offsetting much of the cost of waste management. Eliminating landfills with garbage comes brightly in the picture.

I stay open for whatever discussion about this matter. Use the contact form for questions and for comments you will find a form  to ventilate your opinion, at the bottom of the article.

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Some Thoughts About Management Of Organic Waste 2

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Some thoughts about the Management of Organic Waste – Liquid and Solid.

Continued
This document was last modified on: November 18, 2016

Organic Waste

Introduction

Did you know that mankind is generating more than 3.5 billion tons of organic waste per year, from home as well as our other activities?
Why we should be thinking of ways to better manage our organic waste, is due to the fact that anthropogenic (manmade) emissions of methane, comes from the way we are managing this waste, liquid as well as solid. These emissions surpassed that of natural sources and are rising at an alarming rate in the last 150 to 200 years.

It is for sake of completeness that I need to mention that a substantial amount of atmospheric methane is destructed (sinks), due to stratospheric free radicals like OH, which are reducing methane to CHand water vapor.

Let’s assume that we cannot realistically manage natural emissions from wetlands, forests and others, but there is enough reason to tackle those emissions due to the way we do our daily business.

Areas of these emissions are mainly:

  • Maintenance of Industrial Installations, to stop or reduce leaks.
  • Agricultural Practices and Animal Husbandry in general.
  • Handling of Waste in cities and other communities.

As in Agriculture, rice paddies are a major source of Methane emission if the water in these paddies is not regularly refreshed. Circulating water by irrigating of the paddies, introducing more oxygen, is essential. New Zealand with a considerable agricultural/animal husbandry industry, which is for 50% responsible is contemplating destocking of cattle. This fits into the philosophy to eat less meat .

In general we should adapt a paradigm shift in the way we manage Our Waste and Organic Waste in particular, NOT AS JUST WASTE, BUT AS A RESOURCE. This means we have to Reuse, Reduce and Recycle all waste to infinity. That is the only way to sustainably keep our planet free of waste and hence control pollution in a general sense.

Importance of Managing Organic Waste

It is of the ultimate importance to improve the management of Organic Waste Liquid as well as Solid, as unmanaged storage of this material contaminates soils, waters and air. Think of all the bad odors in rivers and in certain neighbourhoods. In rural areas near live stock farms.

In the first place all residues from residencial, comercial and industrial areas should be separated in three different categories: Organics, Anorganics and Sanitary. In the Waste Management Companies further separation will take place. The Organic part should then be decomposed, either by aerobic or anaerobic systems.

Aerobic Decomposition

The organic material needs to be shredded to particles smaller than one cm. This proces takes place at open air and needs to be mixed with soil and fertilizers, especially carbon and nitrogen, to obtain a useful mix as organic fertilizer.

Many micro and macro organisms are instrumental in the decomposing process. Further de material need to be aerated and watered frequently to avoid overheathing  This proces takes place in Psychrophilic (12-22°) and Mesophilic (25-40°) temperature ranges, with specific bacteria.

But during the process certain Greenhouse Gases are escaping into the atmosphere, such as CO2, CO, N2O, H2S and some minors

Anaerobic Decomposition

The organic material needs to be shredded or ground to particles smaller than one cm. This process takes place in Biodigesters with methanogens under conditions without air. These are closed systems and have the advantage that the Greenhouse Gases captured, s.a. CH4, CO2, N2O, H2S etc., are not escaping in the atmosphere, making it the decomposing system of choice.

Biodigestor

Short History of Biodigesters

There is evidence, that gas produced in biodigesters was used for heating purposes in Middle Eastern countries in the 10th -16th Century and in the 17th Century European investigators confirmed that there was a flammable gas in decaying organic  material. And in the next century it was confirmed that a correlation exist between the amount of organic waste and the amount of gas produced.

In the 19th Century it one investigator confirmed that methane was the main gas produced during anaerobic digestion of animal manure. A few decades later the first anaerobic digestion plant was built in Bombay (now Mombay) in India, while at the end of the 19th Century, in England gas was  captured from a sewer facility to use in street lighting. Further microbiological studies identified anaerobic bacterias were instumental in producing methane gas and what were the conditions for this production.

Many low technology digesters were built in China and India to treat waste in rural areas, while in Europe studies were followed up to buid more sophisticated anaerobic digesters. Sweden, Germany and Austria were taking the lead. Many types of material from other industrial waste were treated or pretreated  in biodigester to lower cost and capture gases.

The need for biodigestion

We should drastically increase the use of these anaerobic biodigesters because of, at least, the following benefits:

  • Capturing and utilizing a potent greenhouse gas.
  • Reducing harmful organic waste.
  • Reducing odor.
  • Destruction of pathogens from the waste.
  • Reduce contamination of soils and water bodies through leaching.
  • Carbon neutral technology.
  • Producing an organic fertilizer without harmful effects.
  • Avoiding leakage of toxins and pathogens from animal products .
  • Avoid tree felling for charcoal production.
  • Clean fuel for generating electrical energy with at least 50% less CO2 emission.

 A biodigester is constructed of metal and concrete or durable and flexible plastics en is meant to contain slurry of water and shredded, mostly herbaceous organic matter, but also material from slaughter houses, droppings from mainly cattle and other ruminants.  Material from slaughter houses may increase the production of CH4, significantly, although has many challenges. There are processes to cope with these challenges.

Under anaerobic (without air) condition, various species of bacteria, prevailing under this condition decompose the organic material. During this process gases are formed, cq. released, and captured in a dome like upper structure. The decomposed material or digestate sinks to the bottom and can be reclaimed from time to time, with special slurry pumps.

There are a multitude of different models of biodigesters and in sizes from small for uses in one family homes to medium or small businesses to large and larger used in businesses of substantial size. You also may find lagoon type  digesters, which are frequently used in larger farms and animal husbandry enterprises. These lagoons are covered with durable flexible polypropylene plastics, which are fairly easy repaired, if punctured.

In the state of Jalisco, Mexico, I visited some porciculture farms, annex animal food processors. They use lagoon type biodigesters fed with excrements of the pigs and covered with tough polypropylene. You can walk on top of it although a bit wobbly. From the gas produced, a generator is run, which provides electricity to the food plant.

Although some biodigesters are meant to be used for one badge at a time, the majority are designed for continuous operations. At one end, the shredded material is fed though an intake, constructed in such a way, that the material enters in the slurry in the container, avoiding the gas to escape. At the other end, a tube enters up to the bottom of the container, to make reclaiming of the decomposed digest possible.

The EPA in the USA estimates a potential for biodigesters in rural areas of 8000. (this will be verified, as it seems very few in my opinion)

In Europe, Germany has almost 7000 anaerobic digesters installed. Austria more than 500, while the rest of Europe accounts on the average just over 100. In developing countries, small-scale anaerobic digesters are used to meet the heating and cooking needs of individual rural communities. China has an estimated 8 million anaerobic digesters while Nepal has 50,000.While in the rest of Asia and Africa over the 500,000 are installed.

In Latin America and the Caribbean a Network for Bio Digester Technology (REDBIOLAC) was set up, coordinating the construction of biodigesters in the region. Already some eleven countries are participating in this NETWORK.

In various countries septic tanks are used, to process the sanitary waste of family homes and businesses. The process is similar as that of biodigesters but the gases are released freely into the air via a standpipe. This should be a good opportunity to convert them to biodigesters with all the advantages of these systems.

Sweden has done extensive studies with biodigestion and in the 18 years experience, filed patents for the various sub-processes. The have demonstration plant in Linköping, Sweden and one in the State of Michigan, USA. They also provide the technologies to overcome many of the challenges.

The Processes of Biodigestion are:

  1. Hydrolysis.
    The organic matter complex, carbon hydrates, fats and proteins are broken down into glucose mokecules, fatty acids and amino acids.
  2. Acidogenesis
    Bacteria decompose glucose molecules, fatty acids and aminoacids into volatile fatty acids and alcohols.
  3. Acetogenesis
    The volatile fatty acids and alcohols are converted into hydrogen, carbon dioxide (CO2) and ammonia (NH3).
  4. Metanogenesis
    Bacteria also called Methanogens are converting the hydrogen and resulting acetic acid into methane (CH4) and carbon dioxide (CO2).

Continue

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