The things I have made
The products I have researched and made, across each period of my work.
Nano R&P
Nanosky water purifiers.
Nano Vietnam
Nano silver masks and applications, PFC and PAFC coagulants.
Vitecone
Director. Filter media and rapid water quality test kits.
CWI Vietnam
Nanosky 2010-2018
The first nano water purifier in Vietnam
Made by Nano R&P, where I was Production Director and led product research and development. Nanosky has 2 main products, rated 50 L/h, for direct drinking. It runs without electricity, produces no wastewater and keeps the minerals in the water.
Filter stages
- Coarse filterMud and sediment
- Heamet 1Heavy metals such as lead and mercury
- Heamet 2Other heavy metals
- ManasManganese and arsenic
- Super Active CarbonAmmonium, organics and chlorine
- Nano silverDisinfection
- Odor removalOdors
NS0302 specifications
| Model | NS0302 |
| Capacity | 50 L/h |
| Inlet pressure | Below 3 kg/cm² |
| Water sources | Tap water, pre-filtered well water, rainwater |
| Dimensions | 420 x 296 x 140 mm (H x W x D) |
| Weight | Unit 7 kg, housing and accessories 3 kg |
| Cartridge life | 18 months on tap water, 12 months on well water |
| Colors | Porcelain white, ripe plum red |
Nano silver 2015-2021
From 2015 to 2021 I did research and worked with Nano Vietnam Co., Ltd, alongside independent research on nano silver face masks, nano silver in antibacterial products, and the new-generation coagulants PFC and PAFC.
V-CLEAN nano silver face masks
Cloth face masks with a nano silver fabric layer, developed with Nano Vietnam Co., Ltd. The company held ISO 9001:2015 and ISO 13485:2016 certificates issued in 2020.
Nano silver for antibacterial use
Nano silver made from silver nitrate and dispersed into solutions of 100-500 ppm. The solution is used directly for disinfection, or coated onto silica gel grains to form an antibacterial filter layer for drinking water.
Silica gel filter layer coated with nano silver
In this study, a 10 mm layer of silica gel coated with nano silver removed all bacteria from the water flowing through it, at a maximum flow rate of 100 L/m²/min.
PFC and PAFC coagulants 2015-2021
New-generation coagulants
PFC (polyferric chloride) and PAFC (polyaluminum ferric chloride) are inorganic polymer coagulants for drinking water and wastewater. The highly charged polymer species of PFC hydrolyze more slowly than Fe³⁺ ions, which gives strong coagulation and a wider working pH range than alum. PAFC suits water at pH 4-11, and works best at pH 6-9.
In a comparison with PAC, PAFC gave the lowest turbidity, the fastest settling and the least sludge. PFC reduced arsenic the most.
| Parameter | Raw sample | PAC | PFC | PAFC |
|---|---|---|---|---|
| Turbidity (NTU) | 7,100 | 7.8 | 8.5 | 5 |
| COD (mg/L) | 2,040 | 35.33 | 0 | 0 |
| Settling time (s) | - | 450 | 255 | 175 |
| Sludge after 1 h settling (ml) | - | 35 | 25 | 20 |
| pH | 7.5 | 6.8 | 7.5 | 7.5 |
| Arsenic (ppb) | 120 | 110 | 0 | 10 |
Tested on a synthetic water sample at 25°C.
Rapid water quality test kits 2019-2022
I built rapid test kits for individual parameters, and a full-box kit covering 9 parameters. The kits are for preliminary assessment in the field, with a relative accuracy of about 80% and a 12-month shelf life.
Iron
0-5 mg/L, 90 tests, colorimetric.
Manganese
0-3 mg/L, 60 tests, colorimetric.
Ammonia
0-10 mg/L, 90 tests, colorimetric.
Arsenic
0-0.1 mg/L, 30 tests, colorimetric.
Hardness
0-500 mg/L, 50 tests, EDTA titration.
9-parameter case
Complete with reagents, standards, test tubes, pipettes and a TDS pen.
Ranges of the 9-parameter case
| Parameter | Range | Number of tests |
|---|---|---|
| Iron (Fe) | 0-5 mg/L | 90 |
| Manganese (Mn) | 0-3 mg/L | 60 |
| Ammonia (NH₄⁺) | 0-10 mg/L | 90 |
| Nitrite (NO₂⁻) | 0-1 mg/L | 90 |
| Arsenic (As) | 0-0.1 mg/L | 30 |
| Hardness | 0-500 mg/L | 50 |
| Chloride | 0-500 mg/L | 50 |
| pH | 4-10 | 40 |
| TDS | 0-999 mg/L | Digital pen |
For supply water, domestic water and hydroponics. Rapid tests for residual chlorine and nitrate came later, developed at CWI.
Filter media 2019-2022
Iron and manganese
Manfex, Ferman
Ferman is quartz sand coated with an active manganese layer. Maximum capacity 4 mg Mn/g and 6.5 mg Fe/g. Grain size 0.4-1.2 mm, density 1.4 g/cm³.
Heavy metals
Manas, Heamet
Heamet is black ceramic coated with iron hydroxide and magnetite, for arsenic, manganese and some heavy metals. Maximum capacity 3.5 mg As/g and 4 mg Mn/g. Grain size 1-2 mm, density 1.25 g/cm³.
Disinfection
Nano silver, Silver Plus
Silver Plus carries 10-30 nm nano silver particles on white ceramic, for disinfection. Grain size 1-2 mm, density 1.4 g/cm³.
Ammonium
Super Active Carbon, Amonifree
Super Active Carbon is activated carbon with a surface oxidized to form -COOH groups, then converted from acid to salt form to raise ammonium exchange. It treats ammonium, odor, organics and residual chlorine. Maximum adsorption 20 mg NH₄⁺/g. Grain size 1-2 mm, density 0.62 g/cm³.
