Statutes, codes, and regulations
New Jersey Administrative Code
Title 7 - ENVIRONMENTAL PROTECTIONChapter 14A - NEW JERSEY POLLUTANT DISCHARGE ELIMINATION SYSTEM
Subchapter 23 - TECHNICAL REQUIREMENTS FOR TREATMENT WORKS APPROVAL APPLICATIONS
Section 7:14A-23.28 - Drying beds for residuals

N.J. Admin. Code § 7:14A-23.28

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Current through Register Vol. 56, No. 21, November 4, 2024
Section 7:14A-23.28 - Drying beds for residuals
(a) The following table of requisite areas applies to domestic sewage, the sludge of which is digested by an anaerobic method. Based upon the physical and chemical characteristics of the residual (for example, domestic/industrial, solids concentration, and/or method of prior stabilization) appropriate adjustments can be made to the following table. Written justification for any adjustments or alternative designs shall be provided in the engineer's report. However, under most circumstances drying beds will not be approved for dewatering unstabilized sewage sludge unless appropriate provisions to control odors have been included.

Area in sq. ft./capita
OpenGlass
Type of TreatmentBedsCovered Beds
Primary1.5060 percent
Standard Rate Filter1.75of the area
High Rate Filter1.75of open
Activated Sludge2.00beds
Chemical Precipitation2.25

(b) The following are minimum requirements governing the design of drying beds and phragmites reed beds:
1. Not less than two beds or compartments shall be provided;
2. For conventional sand drying beds:
i. Gravel shall be at least 12 inches deep with the top at least six inches above underdrains. Gravel shall be graded from 1/8 to one inch in effective diameter; and
ii. Depth of sand shall be at least six inches and shall consist of clean coarse sand.
3. All drying beds shall be provided with underdrains of bell and spigot vitrified clay tile pipe, porous tile, perforated pipe, or other suitable material or drainage. Lateral drains shall be at least four inches in diameter laid with open joints. An acceptable engineering fabric shall be provided around joints. Drains shall be spaced not more than eight feet apart on center and have a minimum slope of one percent.
4. The permeability of the bottom and side walls shall not be greater than 1 x 10[LESS THAN]-7[GREATER THAN] cm/sec and shall extend 15 to 18 inches above the sand surface. Walls shall be at least six inches above the surrounding ground elevation to prevent soil from washing on beds;
5. Means shall be provided to facilitate the removal of dried sludge from drying beds;
6. Influent piping shall provide for uniform distribution of residuals across the entire drying bed area. Splash slabs shall be provided.
7. Residual bed effluent shall be treated and suitable means shall be provided for the satisfactory management of the residual cake.
8. The capacity of the beds shall be sufficient to process the residuals generated to prevent any day to day accumulations.
9. Drying beds proposed to be utilized to satisfy stabilization requirements shall be designed to meet the requirements for pathogen reduction and vector attraction reduction in accordance with N.J.A.C. 7:14A-20. For Phragmites reed beds, a minimum capacity to allow three weeks between loadings to the same bed at the projected sludge production shall be provided. Additional capacity to allow for bed evacuation is recommended.

N.J. Admin. Code § 7:14A-23.28

Amended by R.1997 d.107, effective 5/5/1997.
See: 28 New Jersey Register 380(a), 28 New Jersey Register 2779(a), 28 New Jersey Register 3494(a), 28 New Jersey Register 3858(a), 28 New Jersey Register 4697(a), 28 New Jersey Register 5028(a), 29 New Jersey Register 1704(a).
In (f), substituted N.J.A.C. reference for CFR, Statewide Sludge Management Plan, and U.S.C.A. references.