- Yokohama-shi Top Page
- Lifestyle and procedures
- Community Development and Environment
- Rivers and sewers
- Sewer
- Sewerage and River FAQ
- List of Effective Use
- Does Hama bricks that reuse incinerated ash from sewage sludge contain harmful substances such as heavy metals in sewage?
Here's the text.
Q
Does Hama bricks that reuse incinerated ash from sewage sludge contain harmful substances such as heavy metals in sewage?
Last update date April 3, 2024
A
To confirm the safety of our products, we also conduct tests on the elution of heavy metals from Hama bricks. The measured values and reference values for the elution test are as follows.
| Target for weighing | Measured value (mg/l) | Standard value (mg/l) |
|---|---|---|
| Total mercury | 0.0005 or less | 0.0005 or less |
| Cadmium | 0.001 or less | 0.01 or less |
| Lead | 0.0095 | 0.01 or less |
| Hexavalent chromium | 0.005 or less | 0.05 or less |
| Arsenic | 0.0012 | 0.01 or less |
| Selenium | 0.001 or less | 0.01 or less |
As mentioned above, the elution measurement value is within the standard value and safety is ensured. The standard values apply the environmental standards for soil pollution notified by the Ministry of the Environment.
For inquiries to this page
Sewerage River Bureau Sewerage Facilities Department Facility Management Section
Phone: 045-671-3965・3966
Phone: 045-671-3965・3966
Fax: 045-641-4870
Email address: gk-shisetsukanri@city.yokohama.jp
Page ID: 196-380-726
