Friday, March 9, 2012

searching on Google

Hi, are you searching something about Treatment wetland systems? Look here which are the best results up to date you can get on Google search:

TWs in cold climate - JAPAN case!

My dear friend Kunihiko Kato working at  National Agricultural Research Center for Hokkaido Region, National Agriculture and Food Research Organization(NARO   is also a TWs  designer. Its specialization is project and building of TWs for cold climates zone for high strenght wastewaters like dairy milking parlour and pig wastewaters and potato starch processing wastewaters. These are thypical activities in Hokkaido-Japan. 

In November 2005 was constructed the first  real-scale hybrid wetland system to purify milking parlor wastewater. The main character of the system was the combination of aerobic and anaerobic beds (vertical +  horizontal), a self-priming siphon for intermittent flow into the vertical beds, first volcanic gravel bed to decrease SS and a larch wood chip layer to prevent from icing in the cold climate. 

The first year of functioning was summarized in a useful paper published in the WETPOL conference proceedings held in the beautiful city of Gent (Belgium) in 2007: "First year’s performance of real-scale hybrid wetland system for the treatment of dairy wastewater in cold climate in Japan  K. Kato, T. Koba, H. Ietsugu, T. Saigusa, S. Yanagiya, T. Inoue, K. Kitagawa and S. Kobayashi ."
From this article I copy here the conclusion:

"We could use hybrid wetland system all year round to purify milking parlour wastewater in cold climate in Japan from the first year if the loading rate was appropriate."
In my opinion this is a great target after just one working season!

Many other publications were made from 2005 and a lot of information rise from Kato research activities! Well done Kunihiko I hope to visit your plant in the next future!

here some photos!

general overview of a TWs just planted

from left to right: INLET - OUTLET (potato starch wastewater)
strong men at work!!!! there is a tWs cell below the snow!!! and it works greatly!
vertical bed with the distribution pipes network

Monday, March 5, 2012

Compact Vertical Flow Reed Beds

With the aim of increasing the acceptability of vertical flow reed bed technology, some design and construction  modifications were implemented in the traditional vertical flow beds.
These kind of vertical beds, named COMPACT  are characterised by the following differences :

- Comprise a single bed; no parallel beds or beds in series
- Bed resting period is limited to the interval between influent doses
- Sand layer is relatively deep, being the majority of the bed matrix.

A compact vertical bed was established in April 2000 for sewage treatment to serve two households (Will’s Barn & Willow Farmhouse, Chipstable, Somerset, UK). The system serving a total of 8pe comprised:
- Aquatron separator and composting chamber (Grant et al, 1996)
- gravity-operated dosing device and dosing tank
- vertical reed bed 
-  final pond 
- sample chamber and overflow discharge to willows planted area.

Nutrient Removal
The Total Nitrogen removal was very high . Phosphate too was removed from
solution to a relatively high degree (Jun-Aug00 average: 93.3% decrease). The observations of amphibian development in the receiving pond provide an immediate, ongoingbiological indication of the CVF effluent quality.

Here three photos of the compacted vertical bed build and studied by Christopher M. Weedon:
an overview of the TW.. looks wery good in the countryside!!!

summer aspect of the above TW

the distribution pipe above the compact vertical flow bed

...thaks a lot Chris!

(this text is part of an article originally wrote by Christopher M Weedon - Watercourse Systems Ltd: COMPACT VERTICAL FLOW REED BEDS – DESIGN RATIONALE AND EARLY PERFORMANCE)