N.J. Admin. Code § 7:10-12.33

Current through Register Vol. 56, No. 21, November 4, 2024

Section 7:10-12.33 - Chemical and physical treatment

(a) General requirements for chemical and physical treatment are as follows:

1. A public noncommunity water system using a surface water source is subject to the requirements of 7:10-11.8, 11.12, 11.13 and 11.14.

2. Treatment facilities shall be capable of producing water that meets the applicable State primary and/or secondary drinking water regulations at N.J.A.C. 7:10-5 and 7.

3. Treatment units shall be of sufficient capacity to produce the daily volumes of water required pursuant to 7:10-12.7.

4. All filter shells, ion-exchange pressure tanks and chemical solution feed drums shall be constructed of corrosion resistant materials or contain non-corrodible liners.

5. Point of entry treatment (POET) devices may be used to treat water in any public noncommunity or nonpublic water system. The Department recommends that such devices be certified to meet appropriate ANSI/NSF standards 42, 44, 53, 55, 58, and 62 as amended and supplemented, or the equivalent. POET devices shall also meet ANSI/NSF Standard 61 if used in public noncommunity water systems. In addition, POET devices shall meet the following requirements:

i. Each device shall be equipped with sampling water taps before and after the point at which treatment is applied;

ii. The manufacturer's specifications and the owner's manual for operation and maintenance of each POET device shall be available on-site at all times;

iii. The owner of the water system shall conduct an efficiency test of the device upon its installation. The administrative authority may require the owner of the public noncommunity water system to conduct periodic water quality testing in addition to the quarterly monitoring required under 7:10-5.2(a)13 if the POET device is installed to remove primary contaminants.

6. Wastewater resulting from the backwashing or regeneration of filter media and/or ion exchange resin shall not be discharged to a sanitary sewer system except in accordance with the New Jersey Pollutant Discharge Elimination System rules, N.J.A.C. 7:14A, and with written approval from the appropriate sewerage authority.

(b) Regulations for corrosion control are as follows:

1. pH adjustment for corrosion control is recommended when the pH of the raw water is less than 6.5. The pH adjustment system used for corrosion control shall be capable of raising the pH to a minimum of 7.5 units.

2. A neutralizing filter consisting of a bed of graded limestone may be used to adjust pH.

3. Injection of alkaline chemicals may be used to adjust pH only if the following conditions are met:

i. Only soda-ash, lime, or caustic soda shall be fed by means of a positive displacement pump. Due to safety considerations, the Department does not recommend using caustic soda in small water systems and single dwelling water supply systems.

ii. Operation of the feed pump shall be synchronized with the operation with the well pump.

iii. Safety equipment including respirator, gloves, apron, shower and eye wash facilities shall be provided.

(c) Regulations for removal of iron and manganese are as follows:

1. Iron and manganese removal units shall include an oxidizing process (natural precipitation or chemical precipitation) followed by a filtration process.

2. Iron and manganese removal units which include an open aeration process shall be designed and constructed so as to minimize dust pickup. All air which enters the oxidizing unit shall pass through a corrosion-resistant screen of not less than 24 mesh in order to prevent the entry of insects. Forced air which enters the oxidizing unit shall pass through air particulate filters.

3. Iron and manganese removal units which include an ion exchange process (for example, water softening) shall be designed and constructed such that the treated water will not contain a sodium concentration in excess of 50 mg/l pursuant to N.J.A.C. 7:10-7. The treated water shall not be softened to zero hardness. Potassium regenerant may be used as an alternative to sodium regenerant.

(d) Packed column aeration (PCA) units or equivalent air strippers shall be capable of removing volatile organic compounds (VOCs) from at least twice the maximum levels found in the water to below the applicable MCLs. If the PCA unit is followed by a granular activated carbon (GAC) unit(s), the removal of VOCs may be achieved through the combined use of both treatment units.

1. Each air intake on forced aeration or mechanically induced aeration systems must be equipped with an air particulate filter.

2. Taps by which water can be sampled shall be placed before and after the PCA unit.

(e) Granular activated carbon (GAC) units used for the removal of VOCs shall meet with the following requirements:

1. Each GAC unit shall have a minimum carbon life (prior to VOCs breakthrough) of three months;

2. Taps by which water can be sampled shall be placed before and after each GAC unit tank; and

3. Only virgin GAC shall be used, except regenerated GAC may be used if such GAC was used previously only in potable water treatment plants and regenerated in facilities used only for potable water treatment plant filter media.

(f) Any type of water treatment not described in (a) through (e) above shall meet the requirements of 7:10-11.15, as applicable.

N.J. Admin. Code § 7:10-12.33

Amended by R.2004 d.442, effective 12/6/2004.
See: 36 New Jersey Register 295(a), 36 New Jersey Register 5383(b).
In (a)5, rewrote iii.