No it does not depend on the size of the facility. It depends only on the discharge type and daily generated volume of industrial wastewater as below. And on the flow rate per day, whether a facility has more or less than 15m3/span per day.
Testing Requirements for Suppliers that Generate on Average, Equal To or More Than 15m3 of Industrial Wastewater per Day
| Test Parameters and Sample Locations/ Discharge Types | ZDHC MRSLa Sample untreated wastewater |
ZDHC Heavy Metals Sample discharged wastewater |
ZDHC Conventional and Anions Sample discharged wastewater |
ZDHC Sludge Sample sludge |
| Direct | ✔ | ✔ | ✔ | Sample and test against the major ZDHC sludge disposal pathway in accordance with the ZDHC Wastewater and Sludge Guidelines. |
| Indirect with Pretreatment (with Sludge) | ✔ | Test only arsenic, cadmium, chromium (VI), lead, mercury | ✘ | Sample and test against the major ZDHC sludge disposal pathway in accordance with the ZDHC Wastewater and Sludge Guidelines. |
| Indirect with Pretreatment (without Sludge) | ✔ | Test only arsenic, cadmium, chromium (VI), lead, mercury | ✘ | ✘ |
| Indirect without Pretreatment | ✔ | Test only arsenic, cadmium, chromium (VI), lead, mercuryb | ✘ | ✘ |
| Zero Liquid Discharge (ZLD) | ✔ | ✘ | ✘ | Sample and test against the major ZDHC sludge disposal pathway in accordance with the ZDHC Wastewater and Sludge Guidelines. |
a = Excluding ZDHC heavy metals
b = For the facilities with indirect without pretreatment discharge type ZDHC MRSL substances as well as ZDHC heavy metals (arsenic, cadmium, chromium (VI), lead, mercury) as explained in the above table should be sampled and tested only at untreated wastewater as there is no pretreatment involved.
Testing Requirements for Suppliers that Generate on Average, Less Than 15m3 of Industrial Wastewater per Day
| Test Parameters and Sample Locations/ Discharge Types | ZDHC MRSLa Sample untreated wastewater |
ZDHC Heavy Metals Sample discharged wastewater |
ZDHC Conventional and Anions Sample discharged wastewater |
ZDHC Sludge Sample sludge |
|---|---|---|---|---|
| Direct | ✖️ | ✔️ | ✔️ | ✖️ |
| Indirect with Pretreatment (with Sludge) | ✖️ | ✖️ | ✖️ | ✖️ |
| Indirect with Pretreatment (without Sludge) | ✖️ | ✖️ | ✖️ | ✖️ |
| Indirect without Pretreatment | ✖️ | ✖️ | ✖️ | ✖️ |
| Zero Liquid Discharge (ZLD) | ✖️ | ✖️ | ✖️ | ✖️ |
a = Excluding ZDHC Heavy Metals