Recycling Treated Municipal Wastewater for Industrial Water Use

Table 1. 2000 California Water Recycling Criteria
Appendix B
Status of Water Reuse Regulations and Guidelines
Craddock Consulting Engineers B-2
In Association with CDM & James Crook
WWReuse Tm1_Appendix B_Regulatory.doc
Type of Use
Irrigation of fodder, fiber, and seed crops, orchards b and
vineyards b , processed food crops c , nonfood-bearing trees,
ornamental nursery stock d , and sod farms d ; flushing
sanitary sewers
Irrigation of pasture for milking animals, landscape areas e ,
ornamental nursery stock and sod farms where public
access is not restricted; landscape impoundments;
industrial or commercial cooling water where no mist is
created; nonstructural fire fighting; industrial boiler feed;
soil compaction; dust control; cleaning roads, sidewalks,
and outdoor areas
Irrigation of food crops b ; restricted recreational
impoundments; fish hatcheries
Irrigation of food crops f and open access landscape areas g ;
toilet and urinal flushing; industrial process water;
decorative fountains; commercial laundries and car
washes; snow-making; structural fire fighting; industrial
or commercial cooling where mist is created
Nonrestricted recreational impoundments
Total Coliform
Limits a
Treatment
Required
None required Oxidation
≤23/100 ml a
≤240/100 ml in more than
one sample in any 30-day
≤2.2/100 ml a
≤23/100 ml in more than one
sample in any 30-day period
≤2.2/100 ml a
≤23/100 ml in more than one
sample in any 30-day period
240/100 ml (maximum)
≤2.2/100 ml a
≤23/100 ml in more than one
sample in any 30-day period
240/100 ml (maximum)
Ground water recharge by spreading Case-by-case evaluation
Oxidation
Disinfection
Oxidation
Disinfection
Oxidation
Coagulation h
Filtration i
Disinfection
Oxidation
Coagulation
Clarification j
Filtration i
Disinfection
Case-by-case
evaluation
a
Based on running 7-day median; daily sampling is required.
b
No contact between reclaimed water and edible portion of crop.
c
Food crops that undergo commercial pathogen-destroying prior to human consumption.
d
No irrigation for at least 14 days prior to harvesting, sale, or allowing public access.
e
Cemeteries, freeway landscaping, restricted access golf courses, and other controlled access areas.
f
Contact between reclaimed water and edible portion of crop; includes edible root crops.
g
Parks, playgrounds, schoolyards, residential landscaping, unrestricted access golf courses, and other
uncontrolled access irrigation areas.
h
Not required if the turbidity of influent to the filters is continuously measured, does not exceed 5
nephelometric turbidity units (NTU) for more than 15 minutes and never exceeds 10 NTU, and there is
capability to automatically activate chemical addition or divert wastewater if the filter influent turbidity
exceeds 5 NTU for more than 15 minutes.
i
The turbidity after filtration through filter media cannot exceed an average of 2 NTU within any 24-hour
period, 5 NTU more than 5 percent of the time within a 24-hour period, and 10 NTU at any time. The
turbidity after filtration through a membrane process cannot exceed 0.2 NTU more than 5 percent of the
time within any 24-hour period and 0.5 NTU at any time.
j
Not required if reclaimed water is monitored for enteric viruses, Giardia, and Cryptosporidium.
Source: Adapted from State of California [2000a].