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CARI-340 is a unique non-hazardous reagent developed to replace hazardous sodium hydroxide (caustic soda) solutions for neutralization of acidic wastewaters in many industrial pH adjustment applications. CARI-340 is available in both liquid and powdered form.

The product consists of calcium hydroxide (hydrated lime) blended with dispersants/stabilizers that permit easy preparation of lime based slurries, containing up to 38% by weight calcium hydroxide, that can be easily metered via typical chemical feed systems. Normal calcium hydroxide/water mixtures at 38% solids are a "solid", which is not pumpable at all. "Lime slurries", which provide lower neutralization costs and various chemical benefits, have historically been used in only the largest wastewater treatment systems due to the cost and operating problems associated with the slurry make-up and metering system. CARI-340 eliminates the historical cost and metering system problems associated with use of the lime for neutralization via our exclusive dispersing/stabilization technology.

Replacement of caustic soda with CARI-340 will provide benefits normally associated with lime neutralization; increased removal of heavy metals and organics from the wastewater due to superior coagulation; formation of a denser, faster to settle floc; and formation of an easier to dewater sludge. Unlike caustic soda, CARI-340 is not a hazardous material and is not regulated under SARA Title III. Consequently, there are substantial regulatory benefits from caustic replacement as well as a decreased health and safety concerns.


CARI-340 can be utilized for neutralization of any industrial wastewater which will not be recycled or reused. Typical process design would consist of adding any primary precipitants or coagulants, pH adjustment with CARI-340 (vigorous mixing recommended), followed by polymer addition, sedimentation, and filtration, if needed. Use of CARI-340 is compatible with most automatic pH control circuits and systems, and thus can be easily integrated into existing wastewater treatment systems. Please contact Compliance and Recycling Inc. for a detailed evaluation and design assistance.



CARI-340 was recently used to replace use caustic soda at a major plating job shop in Massachusetts. The shop already had a suitable mix tank and mixer on-hand, the only expense of the conversion was purchase of a peristaltic feed pump.

The major reason for this conversion was environmental, replacement of caustic soda, a SARA Title III hazardous material, with a non-SARA Title material, CARI-340. Results of the conversion were excellent, the shop reports that their effluent metals values were lowered and that the produced sludge was easier to dewater.

Installation was recently completed of a sequential batch system to treat wastewater from wet finishing of lead crystal glass. Due to the wish of the customer to eliminate use of any SARA Title III materials in the wastewater treatment process, CARI-340 was used to replace the caustic soda specified for neutralization in the original design.

Results to date have been excellent, the plant discharge has complied with effluent standards for pH and lead, while the produced sludge is readily dewatered to a dense cake.


Compliance and Recycling Inc. redball 120 Lumber Lane, Unit 15redball Tewksbury, MA redball 01876
Tel. (978) 851-7439 redball Fax (978) 851-7459
www.cari-usa.comMail Box