Septage chlorination

An investigation, of the septage chlorination process were conducted at the Lebanon, Ohio, USA treatment plant which addressed chlorine requirements, dewatering rate, and sand bed underdrainage quality (43). The study concluded the following ... 

A schematic diagram of a chlorine oxidation system is shown in Fig. 6. The heart of the septage chlorination (Purifax) system consists of a disintegrator, a recirculation pump, two reaction tanks, a chlorine eductor, and a pressure-control pump. The chlorine can he fed to the system through a chlorinator and/or evaporator. An influent feed pump and flow meter should also he provided. 

The septage chlorination process equipment (Purifax) is commercially available over a wide range of flow capacities from 55 mVd (10 gpm) to a theoretically unlimited maximum. Sizing information is available from the manufacturer of Purifax. The system can be dimensioned such that the daily volume of septage is treated in 4-6 h. Most septage chlorination units are of a prefabricated, modular design, completely self-contained and skid-mounted. 

The major parameters used to control the septage chlorination process are treated septage color, effluent pH, and effluent chlorine residual. The chlorine dose can be adjusted until the effluent stream is a hght buff color with a pH of 2-2.5, and a chlorine residual of 150-200 mg/L (43). 

The process involving the application of chlorine to drinking water, wastewater, industrial effluent, sludge, septage, swimming pool water, etc., to disinfect or to oxidize undesirable pathogens and compounds is termed chlorination (1-10). When chloramines (instead of chlorine) are used as a disinfectant/oxidant, the process is chloramination (1). 

When chlorination process is used for treatment of sludge and septage, it can also be called chlorine stabilization process (3,5-8). 

This chapter deals with the same topic of chemical oxidation and disinfection, but at the advanced level. Specifically the engineering design and applications of chlorination processes for treatment of wastewater, biosolids, and septage are introduced in detail. 

Chlorine dosage is the amount of chlorine required to oxidize the target substance to be treated (such as water, wastewater, sludge, or septage) plus the desired chlorine residual. The target substance to be treated is termed chlorine demand. Usually the chlorine dosage is computed as mg/L concentration and the chlorine feed system set at the equivalent Ib/d feed rate. 

Bacteriological Data Generated From Chlorination Treatment of Septage"... 

The chlorination process, in conjunction with sand bed dewatering, was an effective septage treatment method. 

Chlorine dosages vary from 700 to 3000 mg/L, depending on the solids content of the septage and the amount of chlorine-demanding substances present. (9). These substances include ammonia, amino acids, proteins, carbonaceous material, and hydrogen sulfide. The Babylon, New York septage treatment facility uses about 0.6 kg C JL influent (5 lb per 1000 gal). 

The chlorine dosage is approx 0.7 kg C JL influent (6 Ib/lOOO gal) for septage with a suspended solids concentration of 1.2%. The chlorine demand varies in proportion to the... 

A summary of the typical design criteria for chlorine stabilization of septage is presented in below ... 

Chlorination system size = to treat daily septage volume within 4-6 h Chlorine dosage = 0.7 kg/L for 1.2% TS, chlorine demand varies directly with TS... 

---