N.J. Admin. Code § 7:10-11.12

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

Section 7:10-11.12 - Chemical handling and chemical feed systems

(a) General requirements for chemical handling and chemical feed systems are as follows:

1. A minimum of two chemical feeders are required for a water treatment plant that treats more than one source of water supply or for a water treatment plant whose capacity exceeds 20 percent of the public community water system capacity. The feeders shall have sufficient capacity to provide all of the chemical required to treat the water through the treatment plant.

2. Variation in the feed rate shall not exceed five percent of the intended application rate.

3. Either flow pacing or residual pacing shall be provided to ensure accurate chemical application rate.

4. Each chemical feeder shall be equipped with a device that accurately measures the amount of chemical feed.

5. An antisiphon device shall be installed on the chemical solution feed line. The device shall include an antisiphon valve to provide a vacuum break on the chemical solution feed line. The chemical feed line shall be looped to a level higher than the highest elevation of chemical storage tank so as to prevent back siphonage or drainage into the treated water supply.

6. Each chemical feeder shall be electrically interconnected with the well or service pump.

7. Each treatment plant shall have a minimum of 30 day storage capacity for chemicals based upon the expected monthly use of chemicals by the treatment plant. If chemicals will be delivered to the treatment plant in bulk deliveries, the tank capacity shall be a minimum of 120 percent of the bulk delivery volume.

(b) Regulations for chemical solution tanks are as follows:

1. Each chemical solution tank shall be provided with adequate agitation to keep the strength of the solution uniform.

2. Makeup water shall be introduced into the chemical solution tank through an air break or other approved method, to prevent back siphonage.

3. The capacity of each chemical solution day tank shall be sufficient to provide at least eight hours worth of chemical solution storage at normal operating feed rates.

4. Direct connection between chemical solution tank drains and sanitary sewer lines are prohibited.

5. Waste liquids or sludge from chemical solution tanks shall be disposed of in accordance with applicable State and Federal law and regulations.

(c) Dry feeders shall be either of the volumetric or gravimetric type, and shall comply with the following requirements:

1. Each dry feeder shall be completely enclosed and equipped with adequate means of dust control.

2. Each solution pot shall be adequate to ensure effective solution or suspension of the chemical.

3. Makeup water shall be introduced into solution pots through an air break or other approved method, to prevent back siphonage.

(d) Chemical feed lines shall be equipped with clean-out connections, shall be easily accessible for repair or cleaning, shall be protected against damage and freezing, shall be corrosion resistant, shall be as short as possible, and shall be provided with adequate slope to permit draining.

(e) Safety regulations are as follows:

1. Equipment for the storage and handling of chemicals that are hazardous to the health of employees shall include the provision of rubber or neoprene gloves and hand washing facilities. Where dry powdered chemicals are handled, National Institute for Occupational Safety and Health (NIOSH) approved dust respirators shall be provided.

2. Safety shower(s) shall be provided for employees where hazardous chemicals are handled. Such showers shall be in close proximity to the handling location.

3. A manufacturer's material safety data sheet for each chemical used on site shall be posted in a conspicuous location.

4. When a hazardous or explosive chemical, such as sodium chlorite or powdered activated carbon, is used, it shall be safely stored and handled. For example, where powdered activated carbon is used, the public community water system shall provide adequate forced draft ventilation of the feed equipment, a fireproof building or compartment for storage, and explosion-proof electrical outlets, lights and motors in the feeder room.

N.J. Admin. Code § 7:10-11.12